Dither circuit using dither including signal component having fr

Details Dither circuit using dither including signal component having fr Dither circuit using dither including signal component having fr

1988-07-19

1989-03-14

Miska, Vit W.

Coded data generation or conversion

Analog to or from digital conversion

Increasing converter resolution

H03K 1300

Patent

active

048128465

ABSTRACT:
A dither circuit for improving linearity in A/D or D/A conversion by adding dither to an input signal of an A/D or D/A converter and subtracting dither from an output signal of the A/D or D/A converter. The dither circuit comprises a 1/2 Fs signal generator for generating a 1/2 Fs signal having a frequency which is 1/2 of a sampling frequency Fs, a noise generator for generating random noise in digital form and an adder for adding the 1/2 Fs signal and the random noise together and supplying a resulting sum signal to the adder and subtractor as dither. According to this invention, a conversion error is reduced with a result that the random noise can be of a small level. Thus, high accuracy requirement in a practical circuit construction is reduced so that the circuit construction is easily performed.

REFERENCES:
patent: 3877022 (1975-04-01), Lehman et al.
Ando et al., Article concerning the Application of Dither to Audio Signals, The Journal of the Acoustical Society of Japan, vol. 39, No. 7, 1983, pp. 452-462.

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