Mixing system for mixing oversampled digital audio signals

Details Mixing system for mixing oversampled digital audio signals Mixing system for mixing oversampled digital audio signals

2007-11-27

2007-11-27

Chin, Vivian (Department: 2615)

Data processing: generic control systems or specific application

Specific application, apparatus or process

Digital audio data processing system

C381S119000

Reexamination Certificate

active

10502171

ABSTRACT:
A mixing system for mixing a plurality of digital audio signals, at least one of which is a noise-shaped oversampled digital audio signal having a predetermined sampling frequency and bit resolution, said system comprising a summing unit for computing a sum signal of said plurality of input signals; a clipping unit having an input for receiving said sum signal, said clipping unit clipping said sum signal; further comprising a filter unit between the input terminals and the clipping unit, arranged to selectively suppress frequency components outside an audio frequency band from the sum signal; and a converter unit arranged to receive a clipped sum signal from the clipping unit and to convert said clipped sum signal into an output signal of said bit resolution, using noise-shaping, the clipping unit being arranged to limit the input values to a range of values that the converter is able to handle in a stable manner.

REFERENCES:
patent: 5581480 (1996-12-01), Olson et al.
patent: 6041080 (2000-03-01), Fraisse
patent: 6255975 (2001-07-01), Swanson
patent: 6285767 (2001-09-01), Klayman
patent: 2002/0036578 (2002-03-01), Reefman

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