Patent Number: 6,295,009

Title: Audio signal encoding apparatus and method and decoding apparatus and method which eliminate bit allocation information from the encoded data stream to thereby enable reduction of encoding/decoding delay times without increasing the bit rate

Abstract: In a method and apparatus for encoding a digital audio signal to transmit the signal as an encoded bitstream formatted as a series of frames, and a corresponding method and apparatus for decoding the encoded bitstream, with audio data being conveyed in each frame as a set of quantized samples which have each been quantized using a calculated scale factor and a number of allocated bits which is specified by bit allocation information that is calculated based on the scale factors, the bit allocation information generated in the encoding process is omitted from each frame of the encoded bitstream, and is again generated in the decoding process by using the received decoded scale factors. The number of frame bits which can be allocated to quantizing the audio data is thereby substantially increased by comparison with the prior art, enabling the frame length to be made shorter and the overall encoding/decoding delay time to be significantly reduced by comparison with prior art methods, without lowering of audio reproduction quality and while still utilizing a low bit rate for the encoded data.

Inventors: Goto; Michiyo (Sagamihara, JP)

Assignee: Matsushita Electric Industrial Co., Ltd.

International Classification: G10L 19/00 (20060101); H03M 7/00 (20060101); H03M 7/30 (20060101); H04B 1/66 (20060101); H03M 007/00 ()

Expiration Date: 09/25/2018