Apparatus for digital-to-analogue conversion

Details Apparatus for digital-to-analogue conversion Apparatus for digital-to-analogue conversion

1992-06-23

1993-10-12

Logna, sharon D.

Coded data generation or conversion

Analog to or from digital conversion

Increasing converter resolution

341143, H03M 120

Patent

active

052529738

ABSTRACT:
An apparatus for digital-to-analogue conversion. A dither generator creates a noise signal which is added to a digital input signal to produce an added output. Noise shaping is performed on the added output at a noise shaping circuit. The noise shaping circuit includes a quantizer with certain threshold levels for quantizing the added signal. A digital-to-analogue (D/A) converter converts the output of the noise shaping circuit to an analog signal. A control circuit widens the threshold levels as a level of the digital input signal becomes zero, and attenuates an input signal to the digital-to-analogue converter by about 1/K times when the threshold levels are increased by K times.

REFERENCES:
patent: 4916449 (1990-04-01), Kubo et al.
patent: 4937576 (1990-06-01), Yoshio et al.
patent: 5012242 (1991-04-01), Yoshio et al.
patent: 5073778 (1991-12-01), Ueki et al.
patent: 5144308 (1992-09-01), Norsworthy
Principles of Digital Audio, 2nd Edition, Ken C. Pohlmann, Howard W. Sams & Co., 1989, Quantization Distortion, pp. 61-70.

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