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Method for rapidly destroying broadcast audio file viruses

A technology of audio files and viruses, applied in speech analysis, instruments, etc., can solve problems that have not been solved well, and achieve the effect of avoiding hacker attacks and low computational complexity

Inactive Publication Date: 2014-07-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

These two problems have not been well solved in the existing methods

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  • Method for rapidly destroying broadcast audio file viruses
  • Method for rapidly destroying broadcast audio file viruses
  • Method for rapidly destroying broadcast audio file viruses

Examples

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Embodiment

[0041] Take the standard 256kbit / s mp2 audio "Fei Xiang-Hometown Cloud.mp2" file as an example of the input original audio. The audio duration is 4 minutes and 24 seconds, and the total number of frames is 11020 frames. In this embodiment, the input audio file is processed in units of coded frames, one frame at a time, until all 11020 frames are processed. Taking 2000 frames as an example, the specific implementation process of the processing is as follows:

[0042] 1. Parsing the frame header: According to the ISO11172-3 standard, the number of channels obtained from the audio frame analysis is 2, the sampling rate is 48000kHz, the bit rate is 256kbps, the sublimit of the highest subband participating in encoding is 27, and the decoding table is the 0th table, etc. information;

[0043] 2. Analyzing subband encoding information: According to the ISO11172-3 standard, the bit allocation and sample code words of each channel subband are analyzed from the audio frame, and the...

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Abstract

The invention provides a method for rapidly destroying broadcast audio file viruses, which adjusts the quantized bits of the audio frames in the coded stream one by one, and rewrites the weighted coded audio frames into the coded stream; when participating in the current audio frame In all the channel sub-bands of encoding, first select 1 channel sub-band to adjust the bit allocation minus 1, and then select 1 or more channel sub-bands to perform bit allocation plus 1 adjustment. The present invention does not need to decode the audio frequency into PCM form, but It simply processes samples of a few channel subbands in the compressed domain, its computational complexity is very low, and it can change audio files in a large range, thereby ensuring the destruction of viruses hidden in audio files.

Description

technical field [0001] The invention belongs to digital audio processing technology, in particular to broadcast audio file processing technology. Background technique [0002] After decades of development, my country's radio network has gradually formed a network system with broadcast network (intranet) and office network (external network) as the core. In order to ensure the safety of radio business and program broadcasting, the State Administration of Radio, Film and Television stipulates that the internal network of radio stations must be isolated from the external network to prevent malicious attacks and virus infections. However, on the other hand, a large amount of material information such as music programs, interview recordings, and news articles need to be exchanged between the internal and external networks. The closed internal network will seriously affect the work efficiency and program quality of the radio station. In order to solve this problem, the security i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/008
Inventor 甘涛何艳敏黄晓革周南兰刚
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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