Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1995-07-20
1997-11-25
Tse, Young T.
Pulse or digital communications
Receivers
Interference or noise reduction
375254, 381 56, 381 94, 395 223, 395 242, H04M 174, H04L 100
Patent
active
056920172
ABSTRACT:
A receiving circuit has an automatic level setting function for a background noise on the receiver side to generate a background noise free from incongruous aural sensation. This circuit is equipped with a voice/silence unit which detects whether a received signal is in a voice or a voiceless state, a signal level detection unit which detects the signal level of the received signal, a background noise unit which outputs a background noise, a selector which selects and outputs the received signal during the voiced period and the output signal of the background noise unit during the voiceless period, a level holding unit which holds the signal level output at the preceding sampling timing detected by the signal level detection unit, and a comparison unit which compares the present signal level output of the signal level detection unit and the preceding signal level output held in the holding unit, the background noise signal being thus obtained, by adding or subtracting a predetermined specified noise level to or from, or by giving any change to, the preceding background noise signal.
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patent: 5539858 (1996-07-01), Sasaki et al.
NEC Corporation
Tse Young T.
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