Analogue-to-digital converter having two decimate filter circuit

Details Analogue-to-digital converter having two decimate filter circuit Analogue-to-digital converter having two decimate filter circuit

1992-02-20

1993-01-05

Mai, Tan V.

Boots, shoes, and leggings

341155, G06F 1531

Patent

active

051776995

ABSTRACT:
In an apparatus for converting an analogue signal to a digital signal, the analogue signal is sampled by a sampling pulse having a multiple frequency (N fs, N is an integer) of a nominal sampling frequency (fs) so as to generate an M bit (M is an integer) digital signal, first and second decimate filter circuits receive the M bit digital signal and provide a multiple M (P M, P is an integer) bit digital signal having the nominal sampling frequency fs, the first decimate filter circuit receives the M bit digital signal at upper M input terminals and the second decimate filter circuit receives the M bit digital signal by bit shift down, and the multiple M bit digital signals output from the first and second decimate filter circuits are added to provide a digital output signal. Therefore, when an analogue audio signal is converted into a digital audio signal, the disturbance of lower bit data by higher bit data can be reduced so that the quality of a reproduced sound can be improved.

REFERENCES:
patent: 4937577 (1990-06-01), Rich et al.

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