Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Patent
1995-10-25
1997-12-02
Ghebretinsae, Temesghen
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
375242, 370522, 395 291, H04B 166
Patent
active
056944250
ABSTRACT:
An audio signal encoding device has a decoder for decoding a digital audio signal of a given code; a pseudo PCM signal generator for interposing the digital audio signal of the given code in a predetermined background signal; a first mode change switch for selecting one of an output signal of the decoder and an output signal of the pseudo PCM signal generator in response to a mode change signal; a pattern change switch for selecting one of a first bit pattern signal and a second bit pattern signal in response to first and second pattern change signals: and a bit pattern interposer for interposing a bit pattern signal selected by the pattern change switch in a signal selected by the first mode change switch. An audio signal compressing and encoding device has an encoder for compressing and encoding an incoming digital audio signal into another digital audio signal of the given code; a signal extractor for extracting a digital audio signal of the given code from the incoming digital audio signal; a first bit pattern detector for detecting whether or not the incoming digital audio signal contains the first bit pattern signal, and for generating the first pattern change signal in response to a result of said detecting; a second bit pattern detector for detecting whether or not the incoming digital audio signal contains the second bit pattern signal, and for generating the pattern change signal and the mode change signal in response to a result of said detecting: and a second mode change switch for selecting one of an output signal of the encoder and an output signal of the signal extractor in response to the mode change signal.
REFERENCES:
patent: 4254304 (1981-03-01), Fulghum et al.
patent: 5177480 (1993-01-01), Clark
patent: 5390177 (1995-02-01), Nahumi
patent: 5430800 (1995-07-01), Miura
patent: 5513211 (1996-04-01), Yabusaki et al.
Kawanobe Takeshi
Suganuma Toshiya
Yagi Toshiki
Ghebretinsae Temesghen
Matsushita Electric - Industrial Co., Ltd.
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