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Method and device for playing digital audio

A technology of digital audio broadcasting and playing method, which is applied in the directions of digital memory information, speech analysis, sound input/output, etc., can solve problems such as audio playback distortion, and achieve the effect of small jitter and guaranteed playback quality

Inactive Publication Date: 2009-09-16
VIMICRO CORP
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention overcomes the problem of audio playback distortion existing in traditional digital audio playback systems, and provides a method and device for digital audio playback

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  • Method and device for playing digital audio
  • Method and device for playing digital audio

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Embodiment Construction

[0016] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0017] The specific embodiment of the present invention takes the digital Liyin as an example. As mentioned above, the digital Liyin is a kind of digital audio broadcasting.

[0018] figure 1 It is a flowchart of a digital audio playback method according to an embodiment of the present invention, such as figure 1 As shown, the playing method of digital audio comprises steps:

[0019] 1) Count the number of local clocks in the audio data frame, each audio data frame includes some audio data;

[0020] In one embodiment of the present invention, the counting method of this step is: when receiving the local clock, the first count value is increased by 1, and when the audio data frame period signal is received, the first count value is output as the local clock value in the audio data frame the number of clock...

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Abstract

The invention provides a method and a device for playing a digital audio which are applied in a digital audio broadcasting receiving terminal with local clocks. The method comprises the steps of counting the number of the local clocks in audio data frames, each audio data frame comprises a plurality of audio data; obtaining the number of the local clocks in the audio data according to the number of the local clocks in the audio data frames; counting the local clocks, generating a playing signal when counting the number of the local clocks in the audio data and outputting the audio data according to the playing signal for playing the audio. The invention enables the digital audio broadcasting receiving terminal to accurately obtain the audio playing frequency, leads the jitter of the audioplaying frequency to be reduced to the minimum and further ensures the playing quality of digital audio broadcasting.

Description

technical field [0001] The invention relates to the field of digital audio, in particular to a method and device for playing digital audio. Background technique [0002] When the transmitter of digital audio broadcasting transmits, the digital audio signal must be encoded first before digital modulation, and then the encoded data and related frame synchronization information, control information, check information, etc. are encapsulated into a data frame. Data frames are transmitted frame by frame. The receiving end of digital audio broadcasting first demodulates the received signal, and then decodes it to restore the digital audio data, but the digital audio data is not decoded and output as a single sample, but output according to the data frame, which requires The receiving end of the digital audio broadcasting processes the decoded audio data, so that the audio data can be uniformly output. Take NICAM (NICAM, Near Instantaneous Companded Audio Multiplex, quasi-instanta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/00G11C7/10G06F3/16G11B20/22H03K3/78
Inventor 尹宝林
Owner VIMICRO CORP
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