Adding Second Enhancement Layer to CELP Based Core Layer
First Claim
1. A method of transmitting an input audio signal, the method comprising:
- encoding a first coding error of the input audio signal with a scalable codec having a first enhancement layer;
encoding a second coding error by using a second enhancement layer after the first enhancement layer, encoding the second coding error comprisingcoding fine spectrum coefficients of the second coding error to produce coded fine spectrum coefficients, andcoding a spectral envelope of the second coding error to produce a coded spectral envelope;
transmitting the coded fine spectrum coefficients and the coded spectral envelope.
1 Assignment
0 Petitions
Accused Products
Abstract
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.
-
Citations
22 Claims
-
1. A method of transmitting an input audio signal, the method comprising:
-
encoding a first coding error of the input audio signal with a scalable codec having a first enhancement layer; encoding a second coding error by using a second enhancement layer 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; transmitting the coded fine spectrum coefficients and the coded spectral envelope. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A method of transmitting an input audio signal, the method comprising:
-
encoding a first coding error of the input audio signal with a scalable codec having a first modified discrete cosine transform (MDCT) enhancement layer; determining if a second MDCT enhancement layer is needed; and if the second MDCT enhancement layer is needed based on the determining, encoding a second coding error by using the second MDCT enhancement layer after the first enhancement layer. - View Dependent Claims (14, 15, 16, 17, 18)
-
-
19. A system for transmitting an input audio signal, the system comprising:
a transmitter comprising an audio coder, the audio coder comprising a code-excited linear prediction (CELP) codec, a first modified discrete cosine transform (MDCT) enhancement layer configured to encode a first coding error, and a second MDCT enhancement layer configured to encode a second coding error, encode fine spectrum coefficients of the second coding error, and encode a spectral envelope of the second coding error. - View Dependent Claims (20, 21, 22)
Specification