发明名称 |
Method and apparatus for representing masked thresholds in a perceptual audio coder |
摘要 |
<p>A method and apparatus are disclosed for representing the masked threshold in a perceptual audio coder, using line spectral frequencies (LSF) or another representation for linear prediction (LP) coefficients. The present invention calculates LP coefficients for the masked threshold using known LPC analysis techniques. In one embodiment, the masked thresholds are optionally transformed to a non-linear frequency scale suitable for auditory properties. The LP coefficients are converted to line spectral frequencies (LSF) or a similar representation in which they can be quantized for transmission. In one implementation, the masked threshold is transmitted only if the masked threshold is significantly different from the previous masked threshold. In between each transmitted masked threshold, the masked threshold is approximated using interpolation schemes. The present invention decides which masked thresholds to transmit based on the change of consecutive masked thresholds, as opposed to the variation of short-term spectra. <IMAGE></p> |
申请公布号 |
EP1160769(A2) |
申请公布日期 |
2001.12.05 |
申请号 |
EP20010304475 |
申请日期 |
2001.05.22 |
申请人 |
LUCENT TECHNOLOGIES INC. |
发明人 |
EDLER, BERND ANDREAS;FALLER, CHRISTOF;SCHULLER, GERALD DIETRICH |
分类号 |
G10L19/04;G10L19/02;H03M7/30;H03M7/36;(IPC1-7):G10L19/02 |
主分类号 |
G10L19/04 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|