Sampling frequency conversion apparatus
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United States of America Patent
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Oct 27, 1992
Grant Date -
N/A
app pub date -
Nov 29, 1991
filing date -
Nov 30, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A sampling frequency conversion apparatus according to this invention converts an input data string based on an input sampling pulse into a data string based on an output sampling pulse having a frequency different from the frequency of the input sampling pulse. The apparatus reproduces the input sampling pulse based on the input data string, generates interpolation sampling pulses having a frequency corresponding to an integral multiple of the frequency of the input sampling pulse, and generates an interpolated data string from the input data string on the basis of the interpolation sampling pulses. On the other hand, the apparatus phase-modulates the output sampling pulse to diffuse its frequency spectrum, and selects and determines a timing of the interpolation sampling pulse closest to the timing of the phase-modulated output sampling pulse. The apparatus selects data corresponding to the selected timing from the interpolated data string, and outputs the selected data.
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