Digital-to-analog converter--preamplifier apparatus

Details Digital-to-analog converter--preamplifier apparatus Digital-to-analog converter--preamplifier apparatus

1991-05-30

1993-09-07

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341131, 381104, H03M 166

Patent

active

052433447

ABSTRACT:
A digital-to-analog converter--preamplifier apparatus serving as an interface between a source of digital audio signal data and an amplifier is disclosed. A digital stage receives multiple digital audio signal inputs, a selected one of which is analyzed by a digital audio interface receiver, processed by a digital signal processing device and a delta-sigma modulator prior to passing to the analog stage for conversion from the digital domain into left and right channel analog audio output signals. Volume control is performed on the audio signal in both the digital domain and the analog domain in order to optimize performance and minimize noise. The present invention automatically adjust for input word lengths of greater than 18-bits.

REFERENCES:
patent: 4667317 (1987-05-01), Baggen
patent: 4910515 (1990-03-01), Iwamatsu
patent: 4916449 (1990-04-01), Kubo et al.
patent: 5046107 (1991-09-01), Iwamatsu

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