A subband‐dpcm codec for HDTV and its performance
Kazunari Irie, Yasuyuki Okumura, Naoya Sakurai, Ryozou Kishimoto · Electronics and Communications in Japan (Part I Communications) · 1995
Abstract 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.