A subband-dpcm codec for HDTV and its performance
| Autor: | Kazunari Irie, Yasuyuki Okumura, Ryozou Kishimoto, Naoya Sakurai |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
High-definition television
Computer Networks and Communications Computer science ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION Multiple sub-Nyquist sampling encoding Data_CODINGANDINFORMATIONTHEORY ENCODE Plesiochronous digital hierarchy Gigabit Megabit Electronic engineering Codec Entropy (information theory) Electrical and Electronic Engineering |
| Zdroj: | Electronics and Communications in Japan (Part I: Communications). 78:49-59 |
| ISSN: | 1520-6424 8756-6621 |
| DOI: | 10.1002/ecja.4410780205 |
| Popis: | Transmitting high definition television (HDTV) signals over digital networks requires bit-reduction coding techniques if cost-effective services are to be provided. This paper describes a high-quality HDTV codec that can encode original 1.2 Gbit/s HDTV signals into 60 and 300 Mbit/s. These bit rates are selectable and are compatible with the transmission rate used in B-ISDN based on the synchronous digital hierarchy (SDH). A subband DPCM (differential pulse-code modulation) coding algorithm capable of distortion-free encoding is used. A new type of perfect reconstructive short-kernel subband filter that reduces subband signal entropy is introduced. the performance of the codec is evaluated using actual video signals. Experimental results show that a very high percentage of the component signals can be transmitted distortion-free at 600 Mbit/s. High-quality images can be regenerated from the 300 Mbit/s signal. |
| Databáze: | OpenAIRE |
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