Data Hiding in Pitch Delay Data of the Adaptive Multi-Rate Narrow-band Speech Codec

摘要: New methods of hiding data in the pitch delay Adaptive Multi-Rate (AMR) speech codec are proposed. The proposed and quantization (PQ) method compared terms embedding bit rate objective quality obtained by Perceptual Evaluation for Speech Quality (PESQ) algorithm. PQ, previous method, quantizes data. Pitch Quantization (APQ), which adaptively varies width value, Change Point (PCP) replaces even subframes with hidden when an abrupt change is observed. results comparison indicated that, all AMR bit-rate modes, less than 220 bps achieved a mean degradation MOS-LQO value 0.1. Considering degradation, were superior to PQ method.