Zte Corporation

Zheng Deng

Hao Yuan

Guoming Chen

Ke Peng

Jiali Li

Zhibin Lin

Kaiwen Liu

Jing Lu

Xiaojun Qiu

Ming Wu

The audio coding method and system of lattice vector quantization is provided in the invention. The method comprises: 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 amplitude envelopes; 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; multiplexing and packing the coded bits of the amplitude envelope and the coded bits of the frequency domain coefficients of each coding sub-band, then sending them to a decoding side.

Audio-encoding/decoding method and system of lattice-type vector quantizing

The invention provides a compensation method for audio frame loss in a MDCT domain, the method comprising: when a frame currently lost is a Pframe, obtaining a set of frequencies to be predicted, and for each frequency in the set, using phases and amplitudes of a plurality of frames before a (P&#x2212;1)frame in a MDCT-MDST domain to predict a phase and an amplitude of the Pframe, and using the predicted phase and amplitude to obtain a MDCT coefficient of the Pframe at each corresponding frequency; for a frequency outside the set, using MDCT coefficients of a plurality of frames before the Pframe to calculate a MDCT coefficient value of the Pframe at the frequency; performing an IMDCT for the MDCT coefficients of the Pframe to obtain a time domain signal of the Pframe.

Compensator and compensation method for audio frame loss in modified discrete cosine transform domain

A hierarchical audio coding, decoding method and system are provided. The method includes dividing frequency domain coefficients of an audio signal after MDCT into a plurality of coding sub-bands, quantizing and coding amplitude envelope values of coding sub-bands; allocating bits to each coding sub-band of the core layer, quantizing and coding core layer frequency domain coefficients to obtain coded bits of core layer frequency domain coefficients; calculating the amplitude envelope value of each coding sub-band of the core layer residual signal; allocating bits to each coding sub-band of the extended layer, quantizing and coding the extended layer coding signal to obtain coded bits of the extended layer coding signal; multiplexing and packing amplitude value envelope coded bits of each coding sub-band composed by core layer and extended layer frequency domain coefficients, core layer frequency coefficients coded bits, and extended layer coding signal coded bits, then transmitting to the decoding end.

Hierarchical audio coding, decoding method and system

Growing community of inventors

Nanjing, China

Zheng Deng