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Sound volume equalization regulation and its application method based on digital television code stream

A digital TV, equalization adjustment technology, applied in the direction of pulse modulation TV signal transmission, can solve problems such as difficulties, achieve the effect of improving quality, promoting development, and avoiding sudden changes in volume

Inactive Publication Date: 2008-08-20
TIANJIN UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

This method requires the support of a specific set-top box, and there are certain difficulties in the implementation process

Method used

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  • Sound volume equalization regulation and its application method based on digital television code stream
  • Sound volume equalization regulation and its application method based on digital television code stream
  • Sound volume equalization regulation and its application method based on digital television code stream

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Embodiment Construction

[0043] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0044]The audio coding in digital TV mainly adopts the MPEG-1 layer 2 standard: first, the 16-bit audio PCM sampling data is sent to the analysis filter bank, and then the sampling data is converted into 32 sub-band sampling values, each sub-band contains 36 Sampled values, every 12 sampled values ​​form a block, and each block of data is normalized and then encoded. In the normalization process of a data block, it is necessary to select according to the scale factor array given by the standard. The selected scale factor (sf) should be greater than the absolute extreme value of the data block, and be consistent with the absolute extreme value of the data block The difference is the smallest. After selecting an appropriate scale factor sf, all sampled values ​​in the block are normalized by the scale factor to obtain the data to be encoded. Theref...

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Abstract

The present invention discloses a sounding volume isostatic-adjusting method basing on the digital television code flow and the applying method thereof. Through the adjusting to the scaling factor sf of two standards of the audio encoding MPEG-1 layer in the digital television and the corresponding scaling factor index sfi, the frequency domain data of the decoding output is altered and further the time domain data is altered in order to isostatic-adjusting the sounding volume. The invention can respectively applied in the multimedia data flow transmission network and the sound volume adjusting and applying of the decoding terminal. The invention avoids the complicated decoding-recoding procession and the required calculating amount is extraordinary low, and therefore the invention can be conveniently applied in the digital television transmission network or decoding terminal for quickly completing the adjusting and the equalizing of the sound volume. The invention is propitious for increasing the quality of the multimedia service such as digital television and the like, pushes the developing of the digital multimedia technique, and avoids the subjective quality reducing caused by the abrupt changing of the sound volume in the digital television system.

Description

technical field [0001] The invention relates to the technical field of digital televisions, in particular to a method for adjusting the volume of digital televisions. Background technique [0002] In the current digital TV system, due to different sources of TV programs, the sound volume of different channels may vary greatly. Therefore, people are often troubled by the volume jump between channels and program segments. In order to provide better digital TV services, audio volume needs to be equalized to improve the service quality of digital TV. [0003] The audio coding algorithm independently developed by Dolby Laboratories in the United States proposes a processing technology for dialogue normalization [1]. This technology automatically reproduces all programs at a uniform average loudness (-31dB fs), so as to achieve a good volume balance. At present, the Dolby audio coding algorithm and standard have been widely used in North America's ATSC digital TV standard and D...

Claims

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Application Information

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IPC IPC(8): H04N7/52
Inventor 刘昱段继忠徐岩李桂苓潘榕王方
Owner TIANJIN UNIV
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