Multichannel audio enhancement, decoding, and rendering in response to feedback
In some embodiments, a method for performing at least one of enhancement, decoding, or rendering of a multichannel audio signal in response to compression feedback or feedback from a smart amplifier. For example, the compression feedback may be indicative of amount of compression applied to each of multiple frequency bands, of the audio signal or an enhanced audio signal generated in response thereto. The enhancement (e.g., bass enhancement) may include dynamic routing of audio content of the input audio signal between channels of an enhanced audio signal generated in response thereto. The enhancement and compression may be performed on a per speaker class basis. Other aspects are systems (e.g., programmed processors) and devices (e.g., devices having physically-limited bass reproduction capabilities, such as, for example, a notebook or laptop computer, tablet, soundbar, mobile phone, or other device with small speakers) configured to perform any embodiment of the method.
1. A method for audio signal compression and enhancement, including: performing enhancement on a multichannel audio signal to generate an enhanced multichannel audio signal; and
performing multiband compression on the enhanced multichannel audio signal using a multiband limiter, thereby generating a compressed, enhanced multichannel audio signal,
wherein the enhancement is performed in response to feedback from the multiband limiter, and wherein the enhancement comprises
extracting a low frequency audio signal and a high frequency audio signal from each channel of the multichannel audio signal,
summing together the extracted low frequency audio signals to generate a summed signal, and
mixing the summed signal back into each extracted high frequency audio signal to generate the enhanced multichannel audio signal.
2. The method of claim 1 , wherein the compression is applied by two or more multiband limiters, each coupled and configured to generate compressed, enhanced audio for playback by a different subset of a set of speakers, and the enhancement includes dynamic routing of audio content of the multichannel audio signal between channels of the enhanced audio signal to be compressed by different ones of the limiters.
3. The method of claim 1 , wherein the enhancement is performed in response to the compression feedback, and the compression feedback is indicative of amount of compression applied to each of at least two frequency bands of the enhanced audio signal.
4. The method of claim 1 , wherein the enhancement is performed in response to the compression feedback, and the compression feedback is indicative of at least one of amount or type of distortion predicted for a least one driver or to be prevented by the step of performing multiband compression.
5. The method of claim 1 , wherein the enhancement includes at least one of bass volume enhancement, virtual bass enhancement, dialog enhancement, or virtualization.
6. The method of claim 1 , wherein the multiband compression is performed on the enhanced multichannel audio signal, in a manner intended to prevent distortion upon playback of the compressed, enhanced multichannel audio signal.
7. A computer program product, the computer program product being tangibly stored on a non-transient computer-readable medium and comprising machine executable instructions which, when executed, cause a machine to perform steps of the method of claim 1 .