Telecommunications – Transmitter and receiver at separate stations – Having measuring – testing – or monitoring of system or part
Patent
1982-03-12
1983-08-16
Ng, Jin F.
Telecommunications
Transmitter and receiver at separate stations
Having measuring, testing, or monitoring of system or part
455228, 367 2, 367127, H04B 1700, H04B 1100
Patent
active
043995560
ABSTRACT:
A pulse generator is provided for transmitting individual acoustic pulses which can be sensed by an audio surveillance device and retransmitted as modulated electromagnetic information. Circuitry is associated with the pulse generator for controlling the time when a first acoustic pulse is generated relative to the detection of an unmodulated carrier frequency. This circuitry further provides for the generation of a second acoustic pulse in the event that a modulated carrier frequency is detected during the interval when it can be expected that the first pulse has resulted in modulation of the previously unmodulated carrier frequency. Means are included in the circuitry for comparing the respective periods between the times the first and second acoustic pulses are generated and when modulation on the carrier frequency occurs within the predetermined intervals following such pulse generations.
REFERENCES:
patent: 3473127 (1969-10-01), Williams et al.
patent: 3939420 (1976-02-01), Risberg et al.
patent: 4127817 (1978-11-01), Bell, Jr.
patent: 4264978 (1981-04-01), Whidden
patent: 4368539 (1983-01-01), Whidden
"Scanlock Mark VB", from Technical Services Agency Inc., 12/15/81.
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