Digital audio signal coding and/or decoding method

Abstract

Abstract A method and apparatus for high efficiency encoding audio signals. The high-efficiency encoding apparatus includes a transform circuit for transforming an input signal into frequency components and a signal component separating circuit for separating the frequency components into tonal components and noisy components. The high-efficiency encoding apparatus also include a tonal component encoding circuit for encoding tonal components and a noisy component encoding circuit for encoding noisy components. The tonal components are made up only of signal components of a specified band and including along with the information specifying the band. The noisy components are normalized a quantized every pre-set in encoding unit and encoded with the quantization precision information. The information on the numbers are quantization steps of the noisy components is encoded with a smaller number of bits for the high-range side than for the low-range side. With the high-efficiency including the method and apparatus, not only not the main information but also the subsidiary information maybe improved in encoding efficiency, while the degree of freedom maybe assured in the method of representing the satisfactory information and satisfactory encoding maybe achieved.

Inventors

• 👤 Kyoya Tsutsui
• 👤 Yoshiaki Oikawa
• 👤 Osamu Shimoyoshi

Bibliographic Details