Pulse or digital communications – Receivers – Automatic gain control
Patent
1996-07-19
2000-01-04
Bocure, Tesfaldet
Pulse or digital communications
Receivers
Automatic gain control
367135, H04L 2708
Patent
active
060118199
ABSTRACT:
An acoustic communication apparatus includes a microphone/speaker for converting a power voltage and an aerial acoustic wave into an electric signal, and generating an acoustic wave corresponding to the input of data; a signal processing circuit for signal processing the electric signal output from the microphone/speaker in response to the input of the power voltage, the signal being received as data, the circuit outputting data responding thereto to thereby drive the microphone/speaker; a starting signal selection amplifier for always receiving the power voltage during a reception waiting mode, and detecting a starting signal having a predetermined frequency from the electric signal output from the speaker; a non-starting signal selection amplifier for receiving the power voltage in response to the detection of the starting signal, and selectively amplifying only a band excluding the frequency band of the starting signal; and a power voltage supply control circuit for supplying the power voltage to the signal processing circuit when the outputs of the detected starting signal and non-starting signal are maintained at a predetermined state.
REFERENCES:
patent: 3737857 (1973-06-01), Carman
patent: 5581516 (1996-12-01), Blackmon
Bocure Tesfaldet
SI Corporation
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