Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1997-03-07
1998-11-03
Williams, Howard L.
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
360 7308, H03M 732, H03M 1700
Patent
active
058315659
ABSTRACT:
A signal processing apparatus is arranged to convert a multi-bit audio signal having the conventional sampling frequency fs KHz and m quantizing bits (m is an integer) into a one-bit audio signal having the sampling frequency 64.times.fs KHz and one quantizing bit. Hence, the apparatus can offer an audio signal in a highly dynamic range. Further, the signal processing apparatus is arranged to separate sub-data added to the multi-bit audio signal in transmission from the multi-bit audio signal, sigma-delta modulate the multi-bit audio signal through the effect of a sigma-delta modulator. This suppresses the adverse effect on the audio signal. The apparatus is also arranged to control the supply of a timing signal and a clock signal to the sigma-delta modulator and a D/A converter based on the sub-data. This makes it possible to positively control a switching timing.
REFERENCES:
patent: 4823207 (1989-04-01), Kobayashi et al.
patent: 4829497 (1989-05-01), Sako et al.
patent: 4918677 (1990-04-01), Ashinuma et al.
patent: 5392040 (1995-02-01), Hayashi
Jean-Pierre Peguy
Maioli Jay H.
Sony Corporation
Williams Howard L.
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