Method and apparatus for converting an analog signal to a digita

Details Method and apparatus for converting an analog signal to a digita Method and apparatus for converting an analog signal to a digita

1985-07-05

1987-08-04

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

340347DD, H03M 300

Patent

active

046849254

ABSTRACT:
An A-D converter which oversamples the input analog signal, at a frequency greater than the Nyquist frequency, and achieves high precision linear coding by performing simple operations at a high sampling frequency f.sub.H while complicated operations are performed at a low sampling frequency f.sub.s. The high sampling frequency may be reduced to the low sampling frequency through a two-step reduction using a sampling frequency converter to reduce the frequency to an intermediate frequency f.sub.M and an integrator/sampler to reduce the sampling frequency further to f.sub.s or directly with the use of an FIR filter having a frequency characteristic in which attenuation is large in the out-of-band and gain deviation is small in-band.

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McLane et al., "Proceeding of IEEE International Conf. on Acoustics, Speech and Signal Processing", Apr. 9-11, 1980, pp. 364-367.
Tewksbury et al.; Oversampled, Linear Predictive and Noise-Shaping Coders of Order N>1; IEEE Trans. Circuits and Systems, vol. CAS-25, No. 7, Jul. 1978, pp. 436-447.

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