Voice services network with automated billing

Claims

What is claimed:

1. Apparatus for use in an information network comprising:

(a) at least one voice message system having:

coupling means for coupling to at least one telephone line, said coupling means having interface means for coupling analog signals to and from said telephone line, converter means coupled to said interface means for converting speech information in digital form to analog speech for coupling to said telephone line, and supervision control signal means for controllably coupling touch tone signals and a line load to said telephone line and detecting touch tone signals and loop current on said telephone line, and

digital control means coupled to said coupling means, said digital control means including digital data storage means for storing speech information in digital form and for storing an operating program, and digital processing means responsive to said operating program to receive signals from and provide signals to said coupling means and to provide speech information in digital form to said converter means, whereby said voice message system may answer incoming calls with verbal prompts and receive information from callers in touch tone coded form, said voice message system having voice message system communication means for communicating with a data base computer means; and

(b) a data base computer means having a data base computer communication means coupled to said voice message system communication means for receiving information relating to calls received by said voice message system and storing the same in a predetermined format, said data base computer means further includes means for coupling to a line coupled to a credit verification service, said data base computer means being a means for automatic communication with the credit verification service to verify credit for a caller for which credit information is not already stored in said data base computer means.

2. The apparatus of claim 1 wherein said data base computer means is a means for storing information with respect to specific prospective callers, and for providing at least part of the information to said voice message system, said voice message system being a means for proceeding with a call in accordance with said operating program responsive in part to information with respect to a caller requested of and received from said data base computer means.

3. The apparatus of claim 2 wherein said data base computer means is a means for storing credit information with respect to specific prospective callers.

4. The apparatus of claim 1 further comprised of live operator terminal means coupled to said data base computer means, said data base computer means being a means for switching a call on said at least one telephone line from said voice message system to said live operator terminal means in response to a request for live operator assistance from a caller received by said voice message system in touch tone form.

5. The apparatus of claim 4 wherein said data base computer means is also a means for providing information relevant to a call to said live operator terminal means when switching a call thereto

6. The apparatus of claim 4 wherein said coupling means includes at least one digital cross-connect circuit for coupling to at least one multiplexed telephone line, and wherein said data base computer means is a means for switching a call by control of said digital cross-connect circuit.

7. The apparatus of claim 1 further comprised of live operator terminal means coupled to said data base computer means, said data base computer means being a means for switching a call on said at least one telephone line from said voice message system to said live operator terminal means in response to a failure of a caller to respond in touch tone form to verbal prompts from said voice message system.

8. The apparatus of claim 1 wherein said data base computer means further includes coupling means for coupling to a telephone line, said data base computer means being a means for receiving calls through said last named coupling means and for providing selected information stored in said data base computer means in response thereto.

9. Apparatus for use in an information network comprising:

(a) a plurality of voice message systems, each having

coupling means for coupling to at least one telephone line, said coupling means having interface means for coupling analog signals to and from said telephone line, converter means coupled to said interface means for converting speech information in digital form to analog speech for coupling to said telephone line, and supervision control signal means for controllably coupling touch tone signals and a line load to said telephone line and detecting touch tone signals and loop current on said telephone line, and

digital control means coupled to said coupling means, said digital control means including digital data storage means for storing speech information in digital form and for storing an operating program, and digital processing means responsive to said operating program to receive signals from and provide signals to said coupling means and to provide speech information in digital form to said converting means, whereby said voice message system may answer incoming calls with verbal prompts and receive information from callers in touch tone coded form, said voice message system having voice message system communication means for communicating with a data base computer means; and

(b) a data base computer means having a data base computer communication means coupled to each of said voice message system communication means of said voice message systems for receiving information relating to calls received by said voice message systems and storing the same in a predetermined format, said data base computer means further includes means for coupling to a line coupled to a credit verification service, said data base computer means being a means for automatic communication with the credit verification service to verify credit for a caller for which credit information is not already stored in said data base computer means.

10. The apparatus of claim 9 wherein said data base computer means is a means for storing information with respect to specific prospective callers, and for providing at least part of the information to said voice message systems, each of said voice message systems being a means for proceeding with a call in accordance with said operating program responsive in part to information with respect to a caller requested of and received from said data base computer means.

11. The apparatus of claim 10 wherein said data base computer means is a means for storing credit information with respect to specific prospective callers.

12. The apparatus of claim 9 further comprised of live operator terminal means coupled to said data base computer means, said data base computer means being a means for switching a call on said at least one telephone line from any of said voice message systems to said live operator terminal means in response to a request for live operator assistance from a caller received by said voice message system in touch tone form.

13. The apparatus of claim 12 wherein said data base computer means is also a means for providing information relevant to a call to said live operator terminal means when switching a call thereto.

14. The apparatus of claim 12 wherein said coupling means includes at least one digital cross-connect circuit for coupling to at least one multiplexed telephone line, and wherein said data base computer means is a means for switching a call by control of said digital cross-connect circuit.

15. The apparatus of claim 9 further comprised of live operator terminal means coupled to said data base computer means, said data base computer means being a means for switching a call on said at least one telephone line from said voice message system to said live operator terminal means in response to a failure of a caller to respond in touch tone form to verbal prompts from said voice message system.

16. The apparatus of claim 9 wherein said data base computer means further includes coupling means for coupling to a telephone line, said data base computer means being a means for receiving calls through said last named coupling means and for providing selected information stored in said data base computer means in response thereto.

17. A method of communication comprising the steps of

(a) providing at least one voice message system coupled to at least one phone line for receiving incoming calls on said at least one phone line, providing verbal prompts to the callers from predetermined messages stored in digitized form, and for receiving information from callers over said at least one phone line in touch tone coded form in response to the verbal prompts; and

(b) providing a data base computer coupled to the at least one voice message system for receiving information from the voice message system relating to each call and storing the same in a form organized at least in part by reference to each respective caller, said data base computer being coupled to a line to a credit verification service and automatically communicating with the credit verification service for credit verification purposes for callers for which such information is not already stored in the data base computer.

18. The method of claim 17 wherein the data base computer maintains credit information regarding a plurality of possible callers, and wherein the at least one voice message system proceeds with a call in accordance with credit information received from the data base computer.

19. The method of claim 17 further including the steps of:

(c) providing a live operator terminal;

(d) coupling the at least one voice message system to at least one phone line through a switch; and

(e) switching an incoming call on said at least one phone line to the live operator terminal in response to a caller reply to a verbal live operator prompt from the voice message system.

20. The method of claim 19 further including the steps of providing information relevant to a call to the live operator terminal by the data base computer when switching a call thereto.

21. A method of communication comprising the steps of

(a) providing a plurality of voice message systems, each coupled to at least one phone line for receiving incoming calls on said at least one phone line, providing verbal prompts to the callers from predetermined messages stored in digitized form, and for receiving information from callers over said at least one phone line in touch tone coded form in response to the verbal prompts; and

(b) providing a data base computer coupled to each of the voice message systems for receiving information from the voice message systems relating to each call and storing the same in a form organized at least in part by reference to each respective caller, wherein the data base computer is coupled to a line to credit verification service, and wherein the data base computer automatically communicates with the credit verification service for credit verification purposes for callers for which such information is not already stored in the data base computer.

22. The method of claim 21 wherein the data base computer maintains credit information regarding a plurality of possible callers, and wherein the voice message systems each proceed with a call in accordance with credit information received from the data base computer.

23. The method of claim 21 further including the steps of:

(c) providing a live operator terminal;

(d) coupling the voice message systems, each to a respective phone line through a switch; and

(e) switching an incoming call on the respective phone line to the liver operator terminal in response to a caller reply to a verbal prompt from the respective one of the voice message systems.

24. The method of claim 23 further including the steps of providing information relevant to call to the live operator terminal by the data base computer when switching a call thereto.

25. Apparatus for use in an information network comprising:

(a) at least one voice message system having:

coupling means for coupling to at least one telephone line, said coupling means having interface means for coupling analog signals to and from said telephone line, converter means coupled to said interface means for converting speech information in digital form to analog speech for coupling to said telephone line, and supervision control signal means for controllably coupling touch tone signals and a line load to said telephone line and detecting touch tone signals and loop current on said telephone line, and

digital control means coupled to said coupling means, said digital control means including digital data storage means for storing speech information in digital form and for storing an operating program, and digital processing means responsive to said operating program to receive signals from and provide signals to said coupling means and to provide speech information in digital form to said converter means, whereby said voice message system may answer incoming calls with verbal prompts and receive information from callers in touch tone coded form, said voice message system having voice message system communication means for communicating with a data base computer means; and

(b) a data base computer means having a data base computer communication means coupled to said voice message system communication means for receiving information relating to calls received by said voice message system and storing the same in a predetermined format, said data base computer means having a means for storing credit information with respect to specific prospective callers, and for providing at least part of the information to said voice message system, said voice message system being a means for proceeding with a call in accordance with said operating program responsive in part to information with respect to a caller requested of and received from said data base computer means, said data base computer means further including means for coupling to a line coupled to a credit verification service, said data base computer means being a means for automatic communication with the credit verification service to verify credit for a caller for which credit information is not already stored in said data base computer means.

26. The apparatus of claim 25 wherein said for coupling to a line coupled to a credit verification service is a means for coupling to a telephone line coupled to said credit verification service.

27. Apparatus for use in an information network comprising:

(a) a plurality of voice message systems, each having;

coupling means for coupling to at least one telephone line, said coupling means having interface means for coupling analog signals to and from said telephone line, converter means coupled to said interface means for converting speech information in digital form to analog speech for coupling to said telephone line, and supervision control signal means for controllably coupling touch tone signals and a line load to said telephone line and detecting touch tone signals and loop current on said telephone line, and

digital control means coupled to said coupling means, said digital control means including digital data storage means for storing speech information in digital form and for storing an operating program, and digital processing means responsive to said operating program to receive signals from and provide signals to said coupling means and to provide speech information in digital form to said converter means, whereby said voice message system may answer incoming calls with verbal prompts and receive information from callers in touch tone coded form, said voice message system having voice message system communication means for communicating with a data base computer means; and

(b) a data base computer means having a data base computer communication means coupled to each of said voice message system communication means of said voice message systems for receiving information relating to calls received by said voice message system and storing the same in a predetermined format, said data base computer means having a means for storing credit information with respect to specific prospective callers, and for providing at least part of the information to said voice message systems, each of said voice message systems being a means for proceeding with a call in accordance with said operating program responsive in part to information with respect to a caller requested of and received from said data base computer means, said data base computer means further includes means for coupling to a line coupled to a credit verification service, said data base computer means being a means for automatic communication with the credit verification service to verify credit for a caller for which credit information is not already stored in said data base computer means.

28. The apparatus of claim 27 wherein said means for coupling to a line coupled to a credit verification service is a means for coupling to a telephone line coupled to said credit verification service.

29. A method of communication comprising the steps of

(a) providing at least one voice message system coupled to a least one phone line for receiving incoming calls on said at least one phone line, providing verbal prompts to the callers from predetermined messages stored in digitized form, and for receiving information from callers over said at least one phone line in touch tone coded form in response to the verbal prompts; and

(b) providing a data base computer coupled to the at least one voice message system for receiving information from the voice message system relating to each call and storing the same in a form having an identifiable relationship to caller, the data base computer also maintaining credit information regarding a plurality a possible callers wherein the at least one voice message system proceeds with a call in accordance with credit information received from the data base computer, the data base computer further being coupled to a line to a credit verification service, and wherein the data base computer automatically communicates with the credit verification service for credit verification purposes for callers for which each information is not already stored in the data base computer.

30. The method of communication comprising the steps of

(a) providing at least one voice message system coupled to at least one phone line for receiving incoming calls on said at least one phone line, providing verbal prompts to the callers from predetermined messages stored in digitized form, and for receiving information from callers over said at least one phone line in touch tone coded form in response to the verbal prompts; and

(b) providing a data base computer coupled to the at least one voice message system for receiving information from the voice message system relating to each call and storing the same in a form having an identifiable relationship to each caller, the data base computer further being coupled to a line to a credit verification service, and wherein the data base computer automatically communicates with the credit verification service for credit verification purposes.

31. The method of claim 30 wherein the data base computer is coupled to a telephone line to a credit verification service for credit verification purposes.

32. The method of claim 30 wherein the data base computer is coupled to a dedicated line to a credit verification service for credit verification purposes.

33. The method of claim 29 wherein the data base computer communicates with the credit verification service when the credit information for a caller is not already stored in the data base computer.

34. The method of claim 33 wherein the information stored in the data bus computer is updated by information received from the credit verification service.

35. The method of claim 29 wherein the progress of a call is effected by the credit information regarding a caller.

36. The method of claim 30 wherein after authorization of credit, the voice message system provides information to the caller in verbal form based on one or more messages stored therein in digitized form.

37. The method of claim 30 wherein after authorization of credit, the voice message system causes the switching of the call to a voice mail system.

38. The method of claim 30 wherein after authorization of credit, the voice message system causes the switching of the call to one of a plurality of telephone lines coupled for conferencing purposes.

39. The method of claim 30 further comprising providing verbal prompts to a caller for encouraging the caller to enter an order in touch tone form, and receiving in touch tone form and detecting and storing the order so detected.

40. The method of claim 39 further comprising receiving a request for operator assistance in touch tone form and transferring the call to a live operator in response thereto.

41. The method of claim 30 further comprising receiving a request for operator assistance in touch tone form and transferring the call to a live operator in response thereto.

42. A method of communication comprising the steps of

(a) providing a plurality of voice message systems, each coupled to at least one phone line for receiving incoming calls on said at least one phone line, providing verbal prompts to the callers from predetermined messages stored in digitized form, and for receiving information from callers over said at least one phone line in touch tone coded form in response to the verbal prompts; and

(b) providing a data base computer coupled to each of the voice message systems for receiving information from the voice message systems relating to each call and storing the same in a form having an identifiable relationship to the respective caller, the data base computer also maintaining credit information regarding a plurality of possible callers wherein the voice message systems each proceed with a call in accordance with credit information received from the data base computer, the data base computer further being coupled to a line to a credit verification service, and wherein the data base computer automatically communicates with the credit verification service for credit verification purposes for callers for which such information is not already stored in the data base computer.

43. Apparatus for use in an information network comprising:

(a) at least one voice message system having:

coupling means for coupling to at least one telephone line, said coupling means having interface means for coupling analog signals to and from said telephone line, converter means coupled to said interface means for converting speech information in digital form to analog speech for coupling to said telephone line, and supervision control signal means for controllably coupling a line load to said telephone line and detecting touch tone signals on said telephone line, and

digital control means coupled to said coupling means, said digital control means including digital data storage means for storing speech information in digital form and for storing an operating program, and digital processing means responsive to said operating program to receive signals from and provide signals to said coupling means and to provide speech information in digital form to said converter means, whereby said voice message system may answer incoming calls with verbal prompts and receive information from callers in touch tone coded form; and

(b) communication means coupled to said voice message system for coupling to a line coupled to a banking card service for automatic communication with the banking card service to authorize credit for caller as a preliminary step to said voice message system proceeding with the call.

44. The apparatus of claim 43 wherein said voice message system is a system for providing information to a caller after completion of credit authorization.

45. The apparatus of claim 43 further including switching means to switch an incoming call to another telephone line, whereby after credit authorization, an incoming call may be transferred to a voice mail system.

46. The apparatus of claim 43 further including conference means whereby two or more telephone lines may be coupled together so that callers on said lines will be conferenced together, and switching means to switch an incoming call to another telephone line, whereby after credit authorization an incoming call may be transferred to one of the telephone lines of said conference means.

47. A method of dispensing information for a charge comprising the steps of:

(a) providing at least one voice message system coupled to at least one phone line for automatically receiving incoming calls on said at least one phone line, providing verbal prompts to the callers from predetermined messages stored in digitized form, and for receiving information from callers over said at least one phone line in touch tone coded form in response to the verbal prompts, the voice message system having the capability of communication with a banking card service;

(b) receiving incoming calls by the voice message system and providing verbal prompts to each caller to encourage the same to enter the caller's banking card information by way of the touch tone keyboard;

(c) receiving in touch tone form and detecting the banking card information from a caller;

(d) automatically communicating with a banking card service to authorize credit in accordance with the banking card information; and

(e) providing the information to be dispensed to the caller in verbal form based on one or more messages stored in the voice message system in digitized form;

(f) all of the foregoing steps (b) through (e) being accomplished without operator intervention.

48. The method of claim 47 wherein the voice message system is coupled to a telephone line to a credit verification service for credit verification purposes.

49. The method of claim 47 wherein the voice message system is coupled to a dedicated line to a credit verification service for credit verification purposes.

50. A method of communication comprising the steps of:

(a) providing at least one voice message system coupled to at least one phone line for automatically receiving incoming calls on said at least one phone line, providing verbal prompts to the callers from predetermined messages stored in digitized form, and for receiving information from callers over said at least one phone line in touch tone coded form in response to the verbal prompts, the voice message system having the capability of communication with a banking card service;

(b) receiving incoming calls by the voice message system and providing verbal prompts to each caller to encourage the same to enter the caller's banking card information by way of the touch tone keyboard;

(c) receiving in touch tone form and detecting the banking card information from a caller; `(d) automatically communicating with the banking card service to authorize credit in accordance with the banking card information; and

(e) switching the respective one of the calls to a voice mail system;

(f) all of the foregoing steps (b) through (e) being accomplished without operator intervention.

51. A method of communication comprising the steps of:

(a) providing at least one voice message system coupled to at least one phone line for automatically receiving incoming calls on said at least one phone line, providing verbal prompts to the callers from predetermined messages stored in digitized form, and for receiving information from callers over said at least one phone line in touch tone coded form in response to the verbal prompts, the voice message system having the capability of communication with a banking card service;

(b) receiving incoming calls by the voice message system and providing verbal prompts to each caller to encourage the same to enter the caller's banking card information by way of the touch tone keyboard;

(c) receiving in touch tone form and detecting the banking card information from a caller;

(d) automatically communicating with a banking card service to authorize credit in accordance with the banking card information; and

(e) switching the respective one of the calls to one of a plurality of telephone lines coupled for conferencing purposes;

(f) all of the foregoing steps (b) through (e) being accomplished without operator intervention.

52. A method of communication comprising the steps of:

(a) providing at least one voice message system coupled to at least one phone line for automatically receiving incoming calls on said at least one phone line, providing verbal prompts to the callers from predetermined messages stored in digitized forms, and for receiving information from callers over said at least one phone line in touch tone coded form in response to the verbal prompts, the voice message system having the capability of communication with a banking card service;

(b) receiving incoming calls by the voice message system and providing verbal prompts to each caller to encourage the same to enter the caller's banking card information by way of the touch tone keyboard;

(c) receiving in touch tone form and detecting the banking card information from a caller; and

(d) automatically communicating with a banking card service to authorize credit in accordance with the banking card information when credit information for a caller is not otherwise automatically accessible to said at least one voice message system;

(e) all of the foregoing steps (b) through (d) being accomplished without operator intervention.

53. The method of claim 42 or 52 further comprised of the steps of providing verbal prompts to a caller for encouraging the caller to enter an order in touch tone form, and receiving in touch tone form and detecting and storing the order so detected.

54. The method of claim 53 further comprised of the step of receiving a request for operator assistance in touch tone form and transferring the respective one of the calls to a live operator in response thereto.

55. The method of claim 52 wherein credit information on callers is maintained in a data base directly accessible to said at least one voice message system, and wherein the data base may be updated with new information on communication with a banking card service.

56. The method of claim 55 wherein the progress of a particular call is affected by the credit information on a caller.

BACKGROUND OF THE INVENTION

1. Field of the Invention.

The present invention relates to the field of information and business systems.

2. Prior Art.

In recent years various technologies have been developed to ease various aspects of communications and business activities. In general, these developments have related to the reducing of costs, and/or the at least partial automating of functions previously done manually to increase the speed and accuracy with which these functions may be accomplished. Described hereinafter are certain of these developments relating to and forming prior art relevant to the present invention.

The Assignee of the present invention currently manufactures and sells an interactive voice exchange computer (IVEC) which plays messages over telephone lines. The system uses a digital computer and enhanced digital speech technology to record and play back natural speech and music with a clarity approaching that of the original sound. A single such system can deliver multiple messages to multiple telephone lines for multiple information providers, independently and simultaneously. It can, for example, answer up to 52 lines on the first ring, respond to one or more touch tone digits dialed by callers, then select and play a sequence of one or more common or unique messages in a pattern depending upon what was dialed. Up to eight completely independent information services can coexist on the same system, with each of the eight playing a simple message or a different complex pattern of messages with any combination of common or unique parts, such as introductions, spots, transitions, tags, and optional fill-ins. If desired, individual spoken worlds may even be selected automatically or by a data link inserted into the message stream to create detailed time, weather and quote services.

All of the messages on the IVEC system may be rerecorded on sight or remotely from any touch tone telephone while the system stays on line answering calls. Different passwords protect each provider from unauthorized updating. The system also keeps separate comprehensive accounting data for each provider, including a grand total, a resetable total, individual line totals, hourly totals and caller choice totals. All of the totals may be obtained on sight or remotely in spoken words and numbers from any touch tone telephone As with updating, different passwords protect each provider from unauthorized access. The system, when fully configured, consists of an IBM AT with the PC DOS operating system, appropriate software, keyboard, CRT display, power line conditioner, one or more four line interface circuit boards and one or more conferencing boards installed either in the computer cabinet itself or in an expansion cabinet.

Also known are credit card services for the verification of credit cards and for the actual charging against a credit card account over phone lines without operator intervention. Such systems generally utilize a credit card reader at the point of sale, together with a numeric keyboard and display for entering the amount to be charged, with all communications between the point of sale and the credit card database being in the form of data communications using either a dedicated line or a conventional telephone line.

Also commonly used y businesses are the so-called "800" area code toll free lines. An 800 number may be called from anywhere in the country on a toll-free basis, with the company having the 800 number paying for the use of the line on a time basis or time-distance basis. Such lines provide a convenient way of allowing customers and prospective customers to call a business from anywhere in the country without either having to pay for the call or alternatively, calling collect, considering the relatively low rates charged for use of an 800 number line, also provide cost savings over conventional long distance service even for outgoing calls.

One of the objects of the present invention is to integrate and enhance these various technologies into a single integrated and versatile system for providing nationwide, a broad variety of capabilities suitable for a wide range of business and communications applications and requirements.

BRIEF SUMMARY OF THE INVENTION

An information network and method for providing a nationwide audio text network, including electronic billing, useful for a wide variety of applications is disclosed. The information network utilizes a telephone message delivery system coupled to phone lines, typically the "800" area code common carrier lines, to receive incoming calls, to interactively respond thereto as controlled by a computer and to communicate with the computer to provide information to and obtain information from a database maintained by the computer. In addition to being coupled to the telephone message delivery system, the computer is typically also coupled to one or more dedicated or dial up lines so as to be capable of obtaining electronic credit card authorization or charges, and is further coupled so as to control the routing of an incoming call, to redirect the call to a live operator or to other equipment, or to outgoing lines to any desired destination. Thus the system may be used for a variety of applications ranging from simple information dissemination to automatic order entry with credit verification or charges, and as a fully automated system without operator intervention or with as much operator intervention as desired for taking information such as addresses not readily remotely enterable to a touch tone keyboard and for assisting in special circumstances. Typical exemplary applications are disclosed.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of a typical IVEC system.

FIG. 2 is a block diagram of a typical embodiment of the present invention Information Network.

FIG. 3 is a logic flow diagram for a typical automated order entry system utilizing the present invention, of which FIGS. 3a, 3b and 3c comprise individual parts of the diagram and FIG. 3d comprises a generalized termination flow diagram used therein.

FIG. 4 is a logic flow diagram illustrating another typical use of the present invention system by an information provider.

DETAILED DESCRIPTION OF THE INVENTION

The present invention system utilizes as a key element the preexisting IVEC system. Accordingly, it is believed best to first describe that system, both in terms of its organization and function, so that thereafter a better understanding of the present invention system and the function of the IVEC system therein may be had. Thus, first referring to FIG. 1, a block diagram of a typical IVEC system may be seen. In hardware configuration, such a system is comprised of a personal computer 20, such as an IBM AT Personal Computer having a hard disk 22 for bulk storage coupled thereto and having a plurality of printed circuit boards coupled to the bus 24 thereof, either being directly inserted into the PC or into an expansion chassis therefor.

One typical board in the IVEC system, referred to as the X4 board, is shown within the phantom enclosure 26. On each such board is a microprocessor 28, specifically a Z80 with associated ROM 30 for permanent storage of the Z80 operating program and RAM 32 for temporary storage of data to support the operating program of the microprocessor, speech data and basic control information. Connected to the microprocessor bus 32 is a shared RAM 36 which in turn is directly connected to the bus 24 of computer 20 and occupies common address space with both the X4 board microprocessor 28 and the IVEC PC 20. The shared RAM is switched back and forth between the PC address space and the microprocessor space to provide data flow therebetween. Both run at full speed without sharing cycles, arbitrating for the bus, etc. Digitized voice information, generally available on the hard disk 22, is transferred as desired to RAM 38, actually comprising one or more memory boards plugged into and within the address space of the computer 20. This digitized voice information is passed to the microprocessor RAM 32 through the shared RAM 36 effectively at real time rates so that each X4 board only stores 32 bytes of digitized voice data per phone line at any one time.

Coupled to the Z80 microprocessor bus 34 on each X4 board are four telephone line interfaces, a typical one being shown in block diagram form within the phantom l