Patent ID: 9015052
Filing Date: 2015-04-21
Classification: G10L,H03M

Abstract:
1. An audio coding method of lattice vector quantization, comprising: dividing frequency domain coefficients of an audio signal for which a modified discrete cosine transform (MDCT) has been performed into a plurality of coding sub-bands, and quantizing and coding an amplitude envelope value of each coding sub-band to obtain coded bits of the amplitude envelope; performing bit allocation on each coding sub-band, and performing normalization, quantization and coding respectively on vectors in a low bit coding sub-band with pyramid lattice vector quantization and on vectors in a high bit coding sub-band with sphere lattice vector quantization to obtain coded bits of the frequency domain coefficients, wherein, the low bit coding sub-band is a coding sub-band in which a number of bits allocated to one frequency domain coefficient is less than a preset threshold value, the high bit coding sub-band is a coding sub-band in which a number of bits allocated to one frequency domain coefficient is greater than or equal to the preset threshold value; and multiplexing and packing the coded bits of the amplitude envelope and the coded bits of the frequency domain coefficients of each coding sub-band to send to a decoding side.