Signal processing apparatus for converting multi-bit signal having sub-data added thereto into one-bit signal
US5831565A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 7, 1997 |
| Grant date | Nov 3, 1998 |
| Priority date | — |
| Expiry date | Mar 7, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M7/3028
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.