| 摘要 |
A method of quantising an audio signal is provided, in which quantisation noise is shaped differently at audible and ultrasonic frequencies. The quantisation noise at audible frequencies may be shaped in a given frequency band to be less than the intrinsic noise in that frequency band. Also provided is a method of processing an audio signal, including quantising and compressing the signal, wherein the quantisation noise at substantially ultrasonic frequencies does not exceed the spectral power level reached during the passages of peak data rate at those frequencies. |
