Method and apparatus for digitally coding and decoding a composi

Details Method and apparatus for digitally coding and decoding a composi Method and apparatus for digitally coding and decoding a composi

1993-07-30

1995-05-16

Groody, James J.

Television

Format

Including pulse modulation of video signal

348484, 348572, H04N 724, H04N 752

Patent

active

054165253

ABSTRACT:
A composite signal which comprises a video signal situated in the base band and a frequency-modulated audio signal situated outside the base band is coded by an N-bit pulse code modulator or an N-bit noise-shaped pulse code modulator with inadequate quality for, for example, N<5 (in particular for N=1) because, after modulation, demodulation and decoding, the video signal is found to affect the audio signal if, as is usual, the amplitude of the video signal is, for example, ten times greater than the amplitude of the frequency-modulated audio signal. If the amplitude of the video signal is not more than five times greater (in the ideal case one and a half times greater) than the amplitude of the frequency-modulated audio signal, the effect mentioned is apparently considerably reduced.

REFERENCES:
patent: 4054794 (1977-10-01), Loughlin et al.
patent: 4275411 (1981-06-01), Lippel
patent: 4639911 (1987-01-01), Rota et al.
patent: 4825286 (1989-04-01), Graves
patent: 4901151 (1990-02-01), Mehrgardt et al.
patent: 5182642 (1993-01-01), Gendorff et al.
A. J. R. M. Coenen, "Noise-Shaped PCM for video Processing and Transmission", Electronics Letters, 25 Apr. 1991, vol. 27, No. 9, pp. 712-713.
A. J. R. M. Coenen, "Maximum SQNR Formula for Delta-Sigma Modulation", Electronics Letters, 19 Jul. 1990, vol. 26, No. 15, pp. 1115-1116.

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