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Apparatus for adaptively encoding input digital audio signals from multi-channels

A digital audio, self-adaptive technology, applied in image communication, speech analysis, transmission system, etc., can solve the problems that cannot reflect the statistical properties of the average and standard deviation of the input digital audio signal

Inactive Publication Date: 2003-06-04
MAPLE VISION TECH
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Problems solved by technology

[0005] However, in the above-mentioned MPEG audio technology, since a fixed number of bits is allocated to each frame, statistical properties such as average, standard deviation, and perceptual entropy of the input digital audio signal, which may continuously change from frame to frame, cannot be reflected

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  • Apparatus for adaptively encoding input digital audio signals from multi-channels
  • Apparatus for adaptively encoding input digital audio signals from multi-channels
  • Apparatus for adaptively encoding input digital audio signals from multi-channels

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Embodiment Construction

[0011] Referring to Fig. 1, there is shown a block diagram schematically illustrating an encoding device 100 according to the present invention.

[0012] The coding device 100 includes a sub-band filtering device 10, first and second sensory parameter estimation devices 20 and 30, first, second and third bit allocation units 40, 50 and 60, a quantization device 70 and a formatting circuit 80.

[0013] In the encoding device 100, the input digital audio signal X1(m , i) and X2(s, i) act on the first sensory parameter estimating device 20 and the sub-band filtering device 10, wherein each input digital audio signal includes M and S samples, thus m=0, 1, ..., M -1; S=0, 1, ..., S-1, and M and S are positive integers, wherein the number of M and S samples is proportional to the sampling frequency of each input digital audio signal from these channels . A "frame" as used herein means a portion of a digital audio signal corresponding to a fixed number of audio samples, and is a p...

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Abstract

A novel appts. for encoding input digital audio signals from N number of channels comprises N number of filters for filtering the input digital audio signals, a first estimator for estimating a first parameter for each of the input digital audio signals; a second estimator for estimating perceptual entropies of the respective frames for each of the input digital audio signals based on the first parameter, to thereby derive a mean and a standard deviations of a first frame group, and for generating second frame groups including F number of frames for each of the N number of channels, N number of quantizers for quantizing the filtered audio signals in response to the corresponding bit allocation information for the respective subbands of the first frame group, and a circuit for formatting the quantized audio signal together with the generated bit allocation information.

Description

technical field [0001] The present invention relates to a digital audio encoding device; more particularly, to an improved device for adaptively encoding input digital audio signals from a plurality of channels based on the perceptual entropy of each input digital audio signal consistent with human hearing. Background technique [0002] The transmission of digitized audio signals makes it possible to transmit high-quality audio signals comparable to those of compact discs and / or digital audio tapes. When an audio signal is represented in digital form, a considerable amount of data needs to be transmitted, especially in the case of high-definition television. However, since the available frequency bandwidth allocated to these digital audio signals is limited, in order to transmit a considerable amount of digital data, for example, 16-bit PCM (Pulse Code Modulation) with a sampling frequency of 48KHz is transmitted through a limited audio bandwidth (about 128KHz). ) audio sig...

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Application Information

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IPC IPC(8): G10L19/008H04B1/66
Inventor 金钟一
Owner MAPLE VISION TECH
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