Horizontal picture compression in widescreen television receiver

Details Horizontal picture compression in widescreen television receiver Horizontal picture compression in widescreen television receiver

1994-06-13

1996-11-19

Kostak, Victor R.

Television

Basic receiver with additional function

Multimode

348445, 348913, H04N 546

Patent

active

055767710

ABSTRACT:
A circuit in a widescreen television receiver effects horizontal picture compression on a standard aspect ratio video signal by storing at least one field of the video signal, generating a read clock signal for reading the video signal from storage, wherein the read clock signal has a frequency equal to F.sub.R, generating a write clock signal for writing the video signal into storage, wherein the write clock signal has a frequency equal to F.sub.W =3/4 F.sub.R. The circuit arrangement includes a write circuit for writing each line in the video signal into a memory using the write clock signal, and a read circuit for reading each line of the stored video signal from the memory using the read clock signal, whereby the read-out video signal forms, on display, a picture occupying 3/4 of the horizontal width of a display of the widescreen television receiver. The circuit is distinguished in that the circuitry for generating the write clock signal divides the read clock signal by a factor of 4, and, since the divided read clock signal, while having no second harmonic, has a strong third harmonic, band-pass filters this divided read clock at the third harmonic which is equal to the write clock signal frequency.

REFERENCES:
patent: 5159438 (1992-10-01), Rabii
patent: 5313303 (1994-05-01), Ersoz et al.

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