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Abstract

A digital audio broadcasting system incorporates a perceptual audio coder that encodes a digital audio signal for broadcast. A 'source label' is provided by controlling the perceptual audio coder in such a way that the number of coefficient samples, n, used in each transmission frame represents information about the source. For example, if the value of n is odd, then a binary '1' is transmitted, but if the value of n is even, then a binary '0' is transmitted. As a result, a low-bit rate 'source label' is transmitted over a number of frames. In a receiver, the source of the digital audio signal is identified by simply monitoring the value of n over the number of frames. More importantly, the value of n in each frame is required by a corresponding perceptual audio decoder, in the receiver, to correctly recover the digital audio signal. As a result, the 'source label' is inseparable from the encoded digital audio signal since any tampering of the value of n after transmission distorts not only the 'source label' but affects the recovery of the digital audio signal as well.

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