TWI244828B - A method of safety-encoding a music file - Google Patents

Abstract

A method of safety-encoding a music file, for encoding the original music data safely, includes dividing several equal frequency band, Modified DCT, re-encoding positive and negative signs, quantization and bit allocation, Huffman coding, and compiling MP3 file. By safety-encoding the music file during the process of compressing it, the file can be prevented from read out correctly without being authorized. Besides, the time for encoding the whole file can be reduced.

Description

1244828 Numbers are matched with the results of a human ear acoustic simulation 'using more bits to encode in the human ear's sensitive frequency bands, while using less bits in the human ear's inaudible or less sensitive bands Metadata is encoded, so the process of quantization and bit allocation can not only reduce the amount of data to achieve the purpose of compression. 'The decompressed music will not be too different from the original music. The data after the normalization process and bit allocation are then Huffman coded. Huffman coding can take the data one step further and perform distortion-free compression. If the number of bits required by the Bahman code is too large, it will return to the quantization process and bit allocation, and a new conversion curve will be taken for the quantization and bit allocation operations. The digitization procedure and the number of bits after bit allocation have been reduced to a certain standard, and the result will be similar to the above-mentioned human ear acoustics. The result is ―error taste. If the quantization procedure and bit allocation after the bit and county The difference between the capital and the machine is greater than the fresh effect of the human ear sound conversion, and it will return to the Lilization process and bit allocation § & for calculation. In the quantitative order and bit allocation, a new conversion curve is taken again to increase the number of simulated bits to reduce the amount of error. If the amount of error is in the mask effect of the acoustic simulation of the human ear, the Huff f-coded result is compiled into an MP3 standard format into an mp3 file. The format of the general MP3 slot case is shown in Figure 2, and the slot head (out of the coffee), side information (Sideinformation), and the main information (also she) are arranged in order. The slot header and ancillary information store the parameters needed for decompression, and the main data store the data of the,,,,,,,,,,,,,,,,,,,,,,,,,,,,, and up, and the bit allocation and Huffman coding. In addition to the monaural or binaural information, the auxiliary information also stores which pair should be selected as her _quasi, jumping bit representation method (es⑽).

Claims (1)

The scope of patent application: 1. A digital music security coding method used to securely encode an original music data. The so-called security coding refers to the reorganization of the original data in an arrangement method that is difficult for others to guess. The digital music secure coding method includes at least: equal fractional frequency bands, and equally dividing the original music data into digital frequency band data; MDCT (Modified Discrete Cosine Transform) conversion, converting signals of each frequency band into frequency domain signals, where the frequency The domain signal has a positive and negative sign and an absolute value; the positive and negative signs are re-encoded to securely encode the positive and negative values of the signal after MDCT conversion; the internal sequence and bit allocation are used to encode the absolute value of the MDCT conversion to reduce people Inaudible or less sensitive frequency band data; distortion-free compression, distortion-free compression of quantization procedures and bit allocation data; and compilation of MP3 file formats. 2. The digital music security coding method described in item i of the patent application scope, further includes-human ear acoustic simulation, which is used to provide-a mask for judging the sound heard by the human ear by quantization procedures and bit allocation. 3. The method for digitally compiling digital music as described in item i of the scope of patent application, the fractional frequency bands of which divide the original music data into 32 frequency bands; The digital music security method described above = the distortionless compression is achieved by a Huffman encoding. / 、 5. According to the method for music security editing described in the application for special fiber, the security code is issued as a block security code. 6. If you apply for the digital music security coding method described in the first lion, the security coding is a stream security coding. 7 ·-a method of digital music security coding, the original music data is securely coded. The so-called security coding refers to the reorganization of the original data in an arrangement method that is not easy for others to guess. Method to small include: Equal fractional frequency band, equally divide the original music data into digital frequency band data · MDCT (Modified Discrete Cosine Transfom) conversion converts the signals of each frequency band into frequency domain signals; quantization procedures and bit allocation , Encode the data after MDCT conversion, so as to reduce the data of the frequency band which is inaudible or less sensitive to human ears; distortion-free compression, distortion-free compression of the quantization process and bit allocation data; distortion-free compression After the information is securely encoded; and the preparation of Mp3 file format. 8. The method of digital music safety according to item 7 of the patent application, further including-human ear acoustic simulation, which is used to provide a mask for judging the sound heard by the human ear by a quantization program and bit allocation. 9. The method for securely encoding digital music as described in item 7 of the scope of patent application, wherein the fractional frequency bands are equally divided into 32-band data. 10. The method for securely encoding digital music as described in item 7 of the scope of patent application, wherein the distortionless compression is achieved by a Huffman encoding. U. The method of digital music security coding as described in item 7 of the scope of patent application, wherein the security coding is a block security coding. 12. The method of digital music security encoding according to item 7 of the scope of patent application, wherein the security encoding is a stream security encoding. 3. A method of digitally encoding music securely. It is used to securely encode an original piece of music data. The so-called secure encoding refers to rearranging the original data in an arrangement method that is difficult for others to guess. The digital music is encoded securely. The method includes at least: equal fractional frequency bands, equally dividing the original music data into digital frequency bands; MDCT (Modified Discrete Cosine Transform) conversion, converting signals of each frequency band into frequency domain signals; quantization procedures and bit allocation, and MDCT The converted data is encoded to reduce the data in frequency bands that are inaudible or less sensitive to human ears; distortion-free compression, distortion-free compression of quantization procedures and bit allocation data; compilation of MP3 file formats; and Safe encoding of MP3 file format. 14. The digital music secure encoding method as described in item 13 of the scope of the patent application, wherein the MP3 file format has at least a header, a subsidiary information (such as information), and a main data . b. The digital music secure encoding method as described in item 14 of the scope of patent application, wherein the MP3 file format secure encoding is a subsidiary information secure encoding in the file format of the Office. 16. The digital music security coding method described in item 13 of the scope of patent application, including human ear acoustic simulation, to provide a mask for judging the sound heard by the human ear by a quantization program and bit allocation. η. A method for securely encoding digital music as described in item η of the patent application range, wherein the fractional frequency bands are equally divided into 32-band data. I8 · If the application is detailed, the digital music safe editing method is as follows: The distortion-free compression is achieved by a Huffman encoding. 19. The method of digital music security coding as described in item 13 of the scope of patent application, wherein the security coding is a block security coding. 20. The digital music security encoding method as described in item 13 of the patent application scope, wherein the security encoding is a stream security encoding.