Title :
Unequal error protection methods for perceptual audio coders
Author :
Sinha, Deepen ; Sundberg, Carl-Erik W.
Author_Institution :
Bell Labs., Lucent Technol., Murray Hill, NJ, USA
Abstract :
In most source coded bit streams certain bits can be much more sensitive to transmission errors than others. Unequal error protection (UEP) offers a mechanism for matching error protection capability to sensitivity to transmission errors. A UEP system typically has the same average transmission rate as a corresponding equal error protection (EEP) system but offers an improved perceived signal quality at equal channel signal to noise ratio. In this work we introduce methods of UEP to the perceptual audio coder (PAC). An error sensitivity classifier divides the bits in classes of different sensitivity. Different channel codes are then applied to each class. We show how punctured convolutional codes can be used for UEP of the PAC bitstream. Experimental results for channels with uniform as well as non-uniform noise/interference level indicate that the systems with UEP exhibit graceful degradation and extended range for applications such as digital audio broadcasting (DAB)
Keywords :
audio coding; channel coding; convolutional codes; digital audio broadcasting; interference (signal); noise; source coding; DAB; UEP; average transmission rate; channel codes; digital audio broadcasting; error sensitivity classifier; experimental results; nonuniform noise/interference level; perceived signal quality; perceptual audio coders; punctured convolutional codes; signal to noise ratio; source coded bit streams; transmission error sensitivity; transmission errors; unequal error protection methods; uniform noise/interference level; Bit rate; Convolutional codes; Decoding; Digital audio broadcasting; Error correction; Error correction codes; Noise level; Signal processing algorithms; Signal to noise ratio; Streaming media;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1999. Proceedings., 1999 IEEE International Conference on
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-7803-5041-3
DOI :
10.1109/ICASSP.1999.760616