Digital-to-analog converter device for processing PCM signals of

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370119, 328151, H03M 166

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046149341

ABSTRACT:
A digital-to-analog converter device for PCM signals at different sampling frequencies comprises a signal converter which expands the frequency distance between a PCM signal band and a side band by converting the sampling frequencies associated with the PCM signals to be reproduced into higher frequencies. With this signal converter, a single low-pass filter can be simplified, having a gradual ramp cut-off characteristic for removal of the side band wherein a pass band cut-off frequency and a stop band cut-off frequency can be adapted for low pass filtering of the PCM signals at different sampling frequencies.

REFERENCES:
patent: 1772165 (1930-08-01), Taylor et al.
patent: 4005276 (1977-01-01), Abramson et al.
patent: 4271508 (1981-06-01), Schenk
patent: 4477900 (1984-10-01), Gruenberg
Application of Real Time Convolution for Audio Equipments Papers of Acoustical Society of Japan 10/78, pp. 247-248, Yamasaki et al.

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