Sampling frequency converter for converting a lower sampling fre

Details Sampling frequency converter for converting a lower sampling fre Sampling frequency converter for converting a lower sampling fre

1988-08-23

1990-02-20

Shoop, Jr., William M.

Coded data generation or conversion

Digital code to digital code converters

Data rate conversion

H03M 730

Patent

active

049030191

ABSTRACT:
A converter converts time-sequential input digital data Q.sub.i having a sampling frequency f.sub.m to time-sequential digital data P.sub.j having a sampling frequency f.sub.n (f.sub.n :f.sub.m =n:m, n>m, n, m; an integer), which comprises a time axis compressing converter 6 receiving the time-sequential input digital data Q.sub.i, adding (n-m) dummy data D.sub.K every m received input data Q.sub.i and outputting the combined data at the frequency f.sub.n and a single transversal type digital filter 12 for performing filter processing on output data from the time-axis compressing converter 6 in which tap coefficient data .beta..sub.k is sandwiched at the cycle of 1/f.sub.n. The tap coefficient data is selected to nullify dummy data D.sub.K which periodically appears, based on impulse response data obtained by sampling a sampling function for the sampling frequency f.sub.m with a frequency of the least common multiple of the sampling frequencies f.sub.n and f.sub.m.

REFERENCES:
patent: 4109110 (1978-08-01), Gingell
patent: 4460890 (1984-07-01), Busby
patent: 4536745 (1985-08-01), Yamaguchi et al.
patent: 4630034 (1986-12-01), Takahashi
patent: 4684925 (1987-08-01), Maruta

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