Audio decoder, audio decoding method and multimedia system

An audio decoder and audio decoding technology, applied in the field of audio decoding, to solve the effect of single decoding format, optional output interface and small hardware overhead

Inactive Publication Date: 2018-07-24
SHANDONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problem of unified decoding of mixed voice formats, and imp

Method used

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  • Audio decoder, audio decoding method and multimedia system
  • Audio decoder, audio decoding method and multimedia system
  • Audio decoder, audio decoding method and multimedia system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This embodiment discloses an audio decoder, such as figure 1 shown, including:

[0044] On-chip ARM processor, on-chip code stream management unit, on-chip audio subsystem and off-chip memory; the on-chip code stream management unit includes a shared storage unit SRAM, and the on-chip ARM processor includes ITCM memory and DTCM unit; the DTCM unit Both the off-chip DDR memory and the off-chip DDR memory include a first buffer unit and a second buffer unit;

[0045] Such as figure 2 As shown, the on-chip ARM processor:

[0046] Controlling the on-chip code stream management unit to demultiplex the compressed audio data and store it in the shared storage unit SRAM;

[0047] Using the TBUS bus to retrieve audio data from the shared storage unit SRAM, and perform type identification;

[0048] According to the type, the corresponding speech decoding program is transferred from the ITCM memory for decoding;

[0049] During the decoding process, the decoded code stream i...

Embodiment 2

[0108] The purpose of this embodiment is to provide a voice decoding method, comprising the following steps:

[0109] Receive compressed audio and perform demultiplexing to obtain audio stream;

[0110] Analyzing the code stream to determine the type of the code stream;

[0111] Call the corresponding decoding algorithm to perform decoding according to the type;

[0112] Configure and output the output parameters of the decoded code stream.

[0113] The parameter configuration includes: decoding frequency setting, decoding mode setting, output decoding register setting, and output mode setting.

[0114] The type of audio data can be parsed and judged by calling the parser.

[0115] In this embodiment, voice decoding is mainly aimed at the following three audio formats: (1) MPEG1Layer I & II; (2) AC-3 (+); (3) HE-AAC (HE: high efficiency, high efficiency; AAC: Advanced Audio Coding, advanced audio coding technology.

Embodiment 3

[0117] The purpose of this embodiment is to provide a multimedia system, including the speech decoder as described in the first embodiment.

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Abstract

The invention discloses an audio decoder and an audio decoding method. The audio decoder comprises an on-chip processor, an on-chip code stream management unit and an off-chip memory, wherein the on-chip code stream management unit comprises a first storage unit, and the on-chip processor comprises a second storage unit; the on-chip code stream management unit performs de-multiplexing on compressed audio data and stores the de-multiplexed audio data into the first storage unit; the on-chip processor takes the audio data from the first storage unit and carries out decoding; and the decoded codestream is stored into the off-chip memory via the second storage unit. The audio decoder solves a problem of unified decoding for mixed voice formats and has high decoding efficiency.

Description

technical field [0001] The invention relates to the field of audio decoding, in particular to an audio decoder, a decoding method and a multimedia system. Background technique [0002] At present, with the continuous increase in the demand for multimedia applications in domestic and foreign markets, people's expectations for video and audio service quality continue to increase, and more and more attention has been paid to video and audio decoding technology, and it has gained rapid development in the past ten years. develop. The decoder is an important part of the speech recognition system that can most intuitively reflect the performance of the system. The research on decoding technology is a process of optimizing the decoding process and improving the decoding recognition accuracy and recognition speed. [0003] At present, most of the decoders in the society provide corresponding decoding technologies for specific speech coding technologies. For example, 201610260757.3 ...

Claims

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Application Information

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IPC IPC(8): G10L19/16
CPCG10L19/167
Inventor 李田来刘方爱苑兆忠
Owner SHANDONG NORMAL UNIV
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