Audio processing

摘要

A metric such as the sum of signal-to-mask ratios of the audio signal is used to determine the complexity 308 of the signal. During complex audio passage 312 the data bitrate 306 is decreased and vice versa for more simple audio passages 314. The invention is preferably used with frame based signals. The audio signal and data signal are combined into a variable or fixed rate signal having audio and data components and further including an indication of the data bitrate. The invention may be used to increase the amount of X-PAD data transmitted in a digital audio broadcast.