Coded data generation or conversion – Analog to or from digital conversion – Multiplex
Patent
1997-10-22
1999-11-23
Toker, Michael
Coded data generation or conversion
Analog to or from digital conversion
Multiplex
H03M 100
Patent
active
059908181
ABSTRACT:
A method of processing audio input signals comprising 1-bit, Sigma-Delta Modulated (SDM) signals is disclosed including the steps of combining the audio input signals to form a combined audio input signal; and utilising a Sigma-Delta Modulator to convert the combined audio input signal to a corresponding Sigma-Delta Modulated output signal. The method can include a linear mix of the audio input signals and each audio input signal can multiplied by a corresponding gain factor before being added together with other of the audio input signals. The Sigma-Delta Modulator can include a noise shaping filter designed to amplify components of the audio input signals below a predetermined threshold frequency and the combining step can include utilising a negative feedback of the combined audio input signal. The noise shaping filter can utilise a series of integrating circuits as a means to decrease the sensitivity of the filter to errors in its coefficients.
REFERENCES:
patent: 5345236 (1994-09-01), Sramek, Jr.
patent: 5627536 (1997-05-01), Ramirez
patent: 5774567 (1998-06-01), Heyl
patent: 5835044 (1998-11-01), Nishino
Lake DSP Pty Limited
Toker Michael
Tran Anh
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