Television – Bandwidth reduction system – Data rate reduction
Patent
1995-11-20
1998-03-24
Tung, Bryan S.
Television
Bandwidth reduction system
Data rate reduction
H04N 732
Patent
active
057318425
ABSTRACT:
In a TV signal encoder device comprising, for encoding a digital TV signal into an encoder device output signal, both having a predetermined dynamic range, an amplitude limiter, a predictive encoder unit for predictive encoding with quantization an amplitude limited signal of a limited dynamic range into a quantized signal having together with quantization noise the predetermined dynamic range, and a code converter for code converting the quantized signal into the device output signal, a forward offset circuit adaptively gives a forward shift to the TV signal so as to avoid undesirable clipping of tip ends of synchronizing signals in the amplitude limited signal. The forward shift and a lower and a higher range reduction of the predetermined dynamic range into the limited dynamic range are preferably equal to a maximum quantization noise level. Instead of the offset circuit, use of an encoder dynamic range defining circuit is more preferred. In this event, a TV signal decoder device comprises instead an inverse offset circuit a decoder dynamic range defining circuit and a level converter.
REFERENCES:
patent: 4334237 (1982-06-01), Reitmeier et al.
patent: 5488418 (1996-01-01), Mishima et al.
Gert Bostelmann, "A Simple High Quality DPCM-Codec for Video Telephony Using 8 Mbit per Second", Nachrichtentechn. Z, 37, (1984), No. 3, pp. 115-117, (month not avail.).
NEC Corporation
Tung Bryan S.
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