Adding second enhancement layer to CELP based core layer

摘要

In an embodiment, a method of transmitting an input audio signal is disclosed. A first coding error of the input audio signal with a scalable codec having a first enhancement layer is encoded, and a second coding error is encoded using a second enhancement layer after the first enhancement layer. Encoding the second coding error includes coding fine spectrum coefficients of the second coding error to produce coded fine spectrum coefficients, and coding a spectral envelope of the second coding error to produce a coded spectral envelope. The coded fine spectrum coefficients and the coded spectral envelope are transmitted.

主权项

1. A method of transmitting an input audio signal with a scalable codec by an audio access device comprising a processor, the method comprising:
encoding, by the processor, a low frequency band signal having an inner core layer coding; encoding, by the processor, a first coding error of the inner core layer coding having a first enhancement layer on the low frequency band of the low frequency band signal; encoding, by the processor, a second coding error of the first enhancement layer by using a second enhancement layer on the low frequency band of the low frequency band signal after the first enhancement layer, encoding the second coding error comprising coding fine spectrum coefficients of the second coding error to produce coded fine spectrum coefficients, and coding a spectral envelope of the second coding error to produce a coded spectral envelope; and transmitting the coded fine spectrum coefficients and the coded spectral envelope.