Multi-channel audio frequency coder

An audio decoder, multi-channel technology, used in instruments, speech analysis, code conversion, etc., to solve the problems of undetectable audio data errors and low frequency resolution

Inactive Publication Date: 2006-10-18
DTS BVI
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Problems solved by technology

The second type is a sub-band encoder with low frequency resolution, which processes sub-band sampling data through ADPCM (adaptive differential pulse code modulat

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[0042] Multi-channel audio coding system

[0043] As shown in FIG. 1, the present invention combines features of two types of known coding schemes in its integrated multi-channel audio encoder 10 and adds new advantageous features. The encoding algorithm used is designed according to the quality level of the original studio of the program, that is, the quality of "better than CD". Different requirements.

[0044] Encoder 12 encodes multi-channel PCM audio data 14, typically sampled at 48 kHz with word lengths of 16-24 bits, into a data stream 16 of known transmission rate, suitably in the range of 32-4096 kbps. Unlike known audio coders, the structure can be extended to higher sampling frequencies (48-192kHz) without detrimental effects on existing decoders designed for baseband sampling frequencies or any intermediate sampling frequencies. compatible case. In addition, the PCM data 14 is divided into frame blocks by the window method and coded one by one, and each frame is...

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Abstract

A subband audio coder employs perfect/non-perfect reconstruction filters, predictive/non-predictive subband encoding, transient analysis, and psycho-acoustic/minimum mean-square-error (mmse) bit allocation over time, frequency and the multiple audio channels to encode/decode a data stream to generate high fidelity reconstructed audio. The audio coder windows the multi-channel audio signal such that the frame size, i.e. number of bytes, is constrained to lie in a desired range, and formats the encoded data so that the individual subframes can be played back as they are received thereby reducing latency. Furthermore, the audio coder processes the baseband portion (0-24 kHz) of the audio band-width for sampling frequencies of 48 kHz and higher with the same encoding/decoding algorithm so that audio coder architecture is future compatible.

Description

[0001] This application is a divisional application of a Chinese patent application with the application number 03156927.7, the filing date being November 21, 1996, and the invention title being "multi-channel vocoder". technical field [0002] The present invention relates to high-quality encoding and decoding of multi-channel audio signals, and more particularly to a sub-band encoder using perfect / non-perfect Filter bank construction, predictive / non-predictive subband coding, transient analysis, and psychoacoustic / minimum mean square error (MMSE) bit-rate allocation are used to generate data streams whose corresponding decoding computations are constrained. Background technique [0003] Known high-quality audio and music encoders can be divided into two broad categories of schemes. The first category is a subband / transform coder with medium to high frequency resolution, which adaptively quantizes subband or coefficient samples within its analysis window based on psychoacou...

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Application Information

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IPC IPC(8): G10L19/008G10LH03M7/30H04B14/04H04S3/00
CPCG10L19/0208H04S3/008G10L19/008
Inventor 斯蒂芬·M·史密斯迈克尔·H·史密斯威廉·保罗·史密斯
Owner DTS BVI
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