D/A converter

Details D/A converter D/A converter

1988-03-14

1989-09-05

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341122, 341141, 341152, H03M 100

Patent

active

048643050

ABSTRACT:
A digital-to-analog converting device, particularly useful in audio device such as compact disc players, including an adder (CA; CA1, CA2) for adding a common random data to a digital data (d) supplied at a constant period and to a sign-reversed data (d), respectively. The signals containing the added random data are converted into analog form by a digital-to-analog converter (DT; DT1, DT2). The difference is taken between the analog signals obtained from the digital data (d) containing the added random data and the sign-reversed data (d) containing the added random data. Such circuit arrangement can provide an analog ouput signal having an amplitude which is twice as large as that obtained by the prior art and yet the resistance thermal noise contained in such analog signal has a reduced relative magnitude, whereby an improvement in signal-to-noise ratio and in tone quality can be achieved.

REFERENCES:
patent: 4467319 (1984-08-01), Uchikoshi
patent: 4542371 (1985-09-01), Uchikoshi
patent: 4686509 (1987-08-01), Araki et al.

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