Electrical apparatus for use in combination with record transducing apparatus of the type which moves a record medium past a fixed position for operative contact with a record or reproducing transducer, which electrical apparatus is comprised of audio reproducing circuitry as well as predetermined control tone reproducing circuits in coaction with tape drive logic and control circuitry; such tape drive control circuitry particularly including circuits for sensing tape drive condition to derive a signal indicative of proper tape movement which may be utilized to further control selected or numerous ones of operational tape drive functions as exercised through gate circuit control of the various transducing apparatus functions.
A circuit arrangement for a telephone answering apparatus having an announcement text recorded on a magnetic tape which is moved from a starting position in a forward direction under the action of a driving motor and after a predetermined lapse of time from the end of the announcement recorded thereon is moved back in the opposite direction to its starting position. Control switching is provided which, when the starting position of the tape is reached, produces an OFF-pulse which arrests the driving motor.
A device for detecting irregular operative situations, particularly for tape decks, serves to detect the rotational state of one of the two discs only. In fact, the rotational state of only one of the two discs carrying the hub for the tape reels implies tape breaking and for this reason the cassette must be ejected or the transport motor must be deenergized. Two motion detectors 11A and 12A, 11B and 12B for the two discs 13A and 13B have as output a logic level 1 if the corresponding disc is stopped while before it rotated or a logic level 0 if the corresponding disc is stopped while before it was stopped; an exclusive OR gate 15 has an inputs the corresponding outputs of two motion detectors, respectively, and the output of exclusive OR gate 15, being 1 when only one of two discs rotates while the other one is stopped, detects an irregular operative situation.
A power fail circuit provides protection for tape such as used in the tape transport apparatus of a video recorder in the event of a failure of the external power supply. The tape transport apparatus includes as a feature the provision of an electrical error signal used to govern drive motors to maintain substantially constant tape tension when the system is operating normally. After power failure occurs, the power fail circuit continues to respond to the error signal by coupling current from the drive motors to provide dynamic braking. Further, current taken from the drive motors selectively is coupled to an energy storage device operatively associated with the system power supply, to provide augmenting energy from the kinetic energy of the motors for continued control of the power fail circuit as the drive motors are caused to decelerate under control to stop.
A combination otoscope and audiometer provided with conventional lighting means and an unobstructed viewing passage for visually inspecting the ear canal of a patient. The hand held instrument is also provided with a calibrated electronic circuit that automatically produces a sequence of tones of different frequencies and intensities, together with means for transmitting these tones to the patient's ear. The circuit includes timing means for precisely controlling the duration of each tone. Neither the production of the tones nor the duration thereof is under the control of the operator. The exterior of the instrument is provided with indicators in the form of light emitting diodes to tell the operator when each tone is being transmitted to the patient's ear.
A detecting device for detecting abnormality in the tape travel, comprises detectors for detecting capstan rotation pulses which have a frequency in accordance with the rotational speed of a capstan which drives and causes a tape to travel, supply reel rotation pulses which have a frequency in accordance with the rotational speed of a supply reel which pays out the tape, and take-up reel rotation pulses which have a frequency in accordance with the rotational speed of a take-up reel which takes up the tape, and a detecting circuit supplied with the three kinds of rotation pulses, for detecting abnormality in the tape travel and for producing an abnormality detection signal which indicates that an abnormality has been detected in the tape travel. The abnormality detecting circuit comprises a microcomputer for carrying out steps of counting the received capstan rotation detection pulses until a counted value of the capstan rotation pulses reaches a predetermined counted value, discriminating whether a supply reel rotation pulse was received during the counting period of the capstan rotation pulses, discriminating whether a take-up reel rotation pulse was received during this counting period, discriminating whether a capstan rotation pulse was received within a predetermined time period, and generating the abnormality detection signal when any one of the three discriminated results is "NO".
