Method and apparatus for allocating adaptive bit

Abstract

Abstract PURPOSE:To utilize a quantization bit number effectively and to obtain excellent quality by applying preset weighting to each conversion coefficient so as to allocate lots of bit numbers to a signal carrying important information and allocating a quantization bit number adaptively. CONSTITUTION:An output of a linear conversion circuit is fed to a terminal 41. An output of an inverse quantization circuit 45 is fed to an interpolation circuit 46 and a weighting circuit 12. The output of the interpolation circuit 46 is fed to an adaptive bit allocation circuit 47, in which a quantization bit is allocated adaptively in response to the power of an interpolation signal, and the output of the circuit 45 is fed to an adaptive bit allocation circuit 14 via the weighting circuit 12. Outputs of adaptive bit allocation circuits 14, 47 are both fed to a selector 13. The output of the circuit 47 is fed to a decision circuit 11 via a distribution calculation circuit 10. The selector 13 receives a control signal of the discrimination circuit and selects and supplies the output of the adaptive bit allocation circuit 47 when the control signal is zero and the output of the adaptive bit allocation circuit 14 when the control signal is logical '1' to an output terminal 48.

Inventors

• 👤 Fumie Hamame
• 👤 羽豆　文江
• 👤 Masahiro Iwadare
• 👤 正宏 岩垂

Bibliographic Details