A melp-based multi-frame joint quantization low-rate speech codec method
A codec method and multi-frame joint technology, which is applied in the field of MELP-based multi-frame joint quantization low-rate speech codec, can solve problems such as poor effect, poor intelligibility of reconstructed signals, and reduced coding rate.
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[0061] Attached below figure 1 , 2 , 3, 4, 5, take the mandarin voice file of 1min as an example to specifically introduce the encoding scheme provided by the present invention, the voice signal sampling rate is 8KHz, the single frame signal time length is set to 25ms, and the sample point length is 200. See Image 6 , as shown,
[0062] Encoder:
[0063] Step 1: Set the target encoding rate to 0.8kb / s, adopt a three-frame joint quantization scheme, assign 60 bits to the parameters of each three-frame signal for quantization, and the code rate is 60bit / 75ms=0.8kb / s, and adopt partial transmission for the parameters, The transmitted parameters include: line spectrum pair frequency lsf, pitch period pitch, gain G, and bandpass signal vp. The specific bit allocation scheme is shown in Table 1.
[0064]
[0065]
[0066] Table 1
[0067]Step 2: Perform de-power frequency processing for the input voice signal, divide the frame according to the set frame length of 25ms, a...
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