Four-sample sample-rate converter

Details Four-sample sample-rate converter Four-sample sample-rate converter

1983-04-13

1986-02-04

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358140, H04N 1120

Patent

active

045689652

ABSTRACT:
A transcoding arrangement transcodes television signals sampled at a first clock rate into second signals sampled at a second clock rate. An integer number of samples of the television signals are assembled into blocks, each block containing an integer number of samples of the second signal. The integers are selected to reduce the number of multipliers required to perform the transcoding. A delay element forms four successive delayed samples of the incoming television signal. The first and last delayed samples are summed and then multiplied by a running variable multiplicand to form a weighted sum signal. The second and third delayed samples are multiplied by respective running variable multiplicands to form second and third weighted delayed samples. The weighted second and third samples are summed to form a sum which is subtracted from the weighted sum signal to form the interpolated output sample. The running variable multiplicands are related to the effective position of the interpolated output sample being formed within a transcoding block of samples.

REFERENCES:
patent: 4016410 (1977-04-01), Eggermont
patent: 4106053 (1978-08-01), Maxemchuk
patent: 4280147 (1981-07-01), Baldwin
patent: 4352122 (1982-09-01), Reitmeier
patent: 4400719 (1983-08-01), Powers
patent: 4438452 (1984-03-01), Powers

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