Bit error management and mitigation for sub-band coding

摘要

Systems and method for managing and/or mitigating the impact of bit errors on encoded frames received by an LC-SBC (Low Complexity Sub-band Coding) decoder are described herein. For example, in one embodiment, the impact of bit errors on an LC-SBC frame received by an LC-SBC decoder is estimated and one of a plurality of bit error management techniques is applied to the LC-SBC frame based on the estimated impact, wherein the bit error management techniques may include performing PLC, performing normal SBC decoding, or performing some other technique for managing and/or mitigating the impact of the bit errors. Techniques for concealing bit errors in LC-SBC frames are also described.

主权项

1. A method in a receiver for concealing bit errors in an encoded representation of an audio signal, comprising:
decoding a plurality of bits included in the encoded representation of the audio signal segment to obtain a sub-band signal; generating a prediction error signal by calculating a difference between a predicted version of the sub-band signal and the sub-band signal; generating at least one error magnitude signal by determining a difference between the sub-band signal and a modified version of the sub-band signal, the modified version of the sub-band signal being obtained by changing, by the receiver, the value of one or more bits in an encoded representation of each sub-band sample in the sub-band signal, and decoding the modified encoded representations of the sub-band samples; comparing the at least one error magnitude signal to the prediction error signal to identify at least one bit in the plurality of bits that is in error; and correcting, by the receiver, the at least one bit identified in the plurality of bits that is in error.