Abstract: An improved EEG system (10) for telemetrically transmitting brain activity data from a portable transmitter to a processing console. The improved EEG system (10) includes a lightweight transmitter (12) which amplifies and digitizes the EEG signals from a set of electrodes (16) and transmits the digital signals along with a checksum to a receiver (14). The transmitter (12) may be carried by the subject under observation. The transmitter (12) of the preferred embodiment includes at least four circuit boards including a selectively interchangeable montage board (18), an amplifier board (24), a processor board (34), and a transmitter board (54). A signal is transmitted toward the receiver (14) and delivered to a conventional computer-controlled broadcast television tuner (80). The selected receiver (14) outputs data which is in an acceptable form for connection to standard microprocessor peripherals.

Abstract: An improved digital delay generator (10) for producing an output pulse/signal a preselected time interval after an input pulse/signal. The digital delay generator (10) of the present invention includes a single auxiliary timer (24) which starts responsive to feeding an input pulse thereto. This auxiliary timer (24) is stopped in response to the first generated clock pulse occurring after the input pulse. The timer (24) is then restarted after a preselected number of cycles of the clock pulse such that the total delay between the input pulse (12) and the output pulse (36) is substantially equal to the insertion delay of the single auxiliary timer (24) plus the preselected delay of the single auxiliary timer plus the delay occasioned by the lapsing of the preselected number of cycles of the clock pulse.