A miniature multichannel biotelemeter system includes a transmitter unit in which signals from different sources are sampled to produce a wavetrain of pulses in which sample pulses of all the signals are separated by sync pulses. The pulses amplitude modulate a radio frequency carrier which is received at a receiver unit. Therein the sync pulses are detected by a demultiplexer which routes the pulses from each different source to a separate output channel wherein the pulses are used to reconstruct the signals from the particular source.
A data monitoring system which simultaneously monitors, transmits by radio an records data relating to a plurality of physiological parameters comprises a portable sensor unit which is worn by the patient and includes a plurality of sensors attached to the patient's body each of which monitors a physiological parameter and generates a corresponding electrical signal, a circuit pack which converts the signals into a series stream of digital data and a transmitter which periodically transmits the data. A base station includes both a receiver which receives the transmitted data and reconverts it to a digital signal and a data processing unit which records the data.
A multi-channel instrumentation system is provided wherein signals from selected electrode pairs are sequentially connected to the isolated input of a common signal amplifying path. The electrode pair selecting means is included in a portable head box which may be placed adjacent to the patient to be tested. Included in the head box are facilities for testing the impedance of any selected one of the patient electrodes and providing a visual indication of the magnitude of such impedance. The head box also includes facilities for selecting a group of patient electrodes which are connected together and used as an average or reference potential for one input of the common signal path. Facilities are also provided for calibrating the common signal path by applying a d.c. calibration signal to the input thereof by means isolated from sytem ground. An improved circuit arrangement is provided for limiting the current which can be drawn from the patient ground electrode to a small value to provide for the safety of the patient in the event of malfunctioning of the electrode selecting means. Facilities are provided in the common signal path for removing the d.c. components of the electrode pair signal voltages, and for selectively varying the gain of the common signal path on an individual channel basis.
A small telemetry system for small diameter missiles uses a combined wrapund antenna, discreet circuit boards, and heat-sink bulkheads to achieve a small telemetry system to replace the payload on such missiles.
A light and weather resistance testing apparatus (9) is provided with a sensor (1) located in the plane of the testing samples (14). The sensor (1) uses a transmitter (4) for wireless transmission of signals representing radiation received to an antenna (3) disposed on the wall (8) of the apparatus housing. The sensor (1) has multiple receptor cells (6) for various spectral ranges. The sensor (1) is powered by solar cells (7) located on the sensor housing. A plotter and display unit (13) can be connected to the apparatus for read-out of irradiance and irradiation. The wireless transmission of data from sensors to the display unit permits continuous measurement during rotation of samples and sensor.
An electropalatograph for speech training and the like, which electrically detects linguapalatal contact mode during phonations by means of many contact sensing electrodes provided on a surface with which trainee's tongue contacts of artificial palate device mounted to hard palate surface of the trainee, detected informations denoting the contact mode are transmitted as electromagnetic waves from a transmitter disposed within the trainee's mouth, and transmitted waves are received by a receiver disposed outside the trainee's body and displayed to be observed as dynamic patterns of actual linguapalatal contact mode.
