THESIS
2000
vii, 46 leaves : ill. ; 30 cm
Abstract
A new error concealment scheme and a new unequal error protection scheme for enhancing the quality of the wireless transmitted MPEG audio is introduced. The error concealment scheme uses the frame data before and after the error frame on each subband to generate a new frame to substitute the error frame by the method of interpolation and fading. The quality of decoded audio is found improved in the golden ear test. The unequal error protection scheme is divided into two parts. The first part, namely the unequal frame protection, put more protection on the header portion of the MPEG frame and less protection on the data sample portion of the MPEG frame. The second scheme; namely the unequal sample protection, put more protection on the most significant bits (MSBs) of the quantized data s...[
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A new error concealment scheme and a new unequal error protection scheme for enhancing the quality of the wireless transmitted MPEG audio is introduced. The error concealment scheme uses the frame data before and after the error frame on each subband to generate a new frame to substitute the error frame by the method of interpolation and fading. The quality of decoded audio is found improved in the golden ear test. The unequal error protection scheme is divided into two parts. The first part, namely the unequal frame protection, put more protection on the header portion of the MPEG frame and less protection on the data sample portion of the MPEG frame. The second scheme; namely the unequal sample protection, put more protection on the most significant bits (MSBs) of the quantized data samples and less protection on the least significant bits (LSBs). Besides, a new measurement scheme using the peak-subband-error-power-to-mask ratio is introduced to measure the quality of the audio. Simulation results show that when comparing to the equal error protection scheme, the proposed scheme reduces the frame error rate by a factor of 2 and lowers the peak-subband-error-power-to-mask ratio of the audio data by as much as 11 dB.
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