Method and device for encoding-decoding a narrow band high defin

Details Method and device for encoding-decoding a narrow band high defin Method and device for encoding-decoding a narrow band high defin

1991-03-19

1994-05-10

Oberley, Alvin E.

Television

Bandwidth reduction system

Format type

348384, H04N 712

Patent

active

053113080

ABSTRACT:
A method and device are provided for encoding-decoding an HD digital television signal into a narrow band encoded signal. The HD digital television signal is representative of high definition images sampled at a frequency f1, and the narrow band encoded signal corresponds to a narrow band signal sampled at f2, wherein f2<f1. Narrow band encoding is achieved by horizontal compression by decimation of the image lines of the HD digital television signal so as to bring the number N1 of useful pixels per image line to a value N2=.alpha. of the sampling frequencies, so as to thus form an encoded signal representative of an image line and obtain reduced format high definition images. A narrow band encoded signal representative of digital television signals can thus be broadcast over an HD-MAC NB type channel.

REFERENCES:
patent: 4661862 (1987-04-01), Thompson
patent: 4730215 (1988-03-01), Jose et al.
patent: 4974064 (1990-11-01), Tsinberg

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