Patent ID: 9633663
Date: 2017-04-25
CPC Classifications: G10L

Claim:
1. An audio encoding apparatus comprising: an encoder for encoding a time segment of an input audio signal to be encoded to acquire a corresponding encoded signal segment, the encoder having a quantizer using a quantization threshold as an encoding parameter in the encoding the time segment; a decoder for decoding the encoded signal segment to acquire a decoded signal segment; and a clipping detector for analyzing the decoded signal segment with respect to at least one of an actual signal clipping or a perceptible signal clipping and for generating a corresponding clipping alert; wherein the encoder is further configured to again encode the time segment of the input audio signal with at least one modified encoding parameter resulting in a reduced clipping probability in response to the clipping alert, the at least one modified encoding parameter causing the encoder to modify a rounding procedure in the quantizer by selecting a modified quantization threshold for a frequency coefficient, the modified quantization threshold being smaller than the quantization threshold used in the encoding, and wherein at least one of the encoder, the decoder, and the clipping detector comprises a hardware implementation.