1975-05-27
1976-08-10
Claffy, Kathleen H.
179 15R, 179 1VL, H03G 326
Patent
active
039743365
ABSTRACT:
A system of removing quantizing noise signals between words of an infinite-clipping speech system is disclosed.
Speech signals are quantized in amplitude and in time without substantial loss of intelligibility. The speech signal and a square-wave squelch signal of relatively high frequency are added together, and the sum is amplified, clipped and quantized in time. Timing information from the quantized signal is used to detect the presence of the squelch signal. This information, together with the quantized signal is fed to a tri-level signal generator which generates a high output signal level when the speech signal is high, a low output signal level when the speech signal is low, and a zero level signal when the squelch signal is present, thereby removing all noise signals between words.
REFERENCES:
patent: 3766542 (1973-10-01), Tomozawa
patent: 3855555 (1974-12-01), Buckhard
patent: 3857111 (1974-12-01), Deschenes
patent: 3902123 (1975-08-01), Domer
Claffy Kathleen H.
Iowa State University & Research Foundation, Inc.
Kemeny E. S. Matt
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