Abstract
The speech codec analyzes the speech using A(z) (analysis filter) and synthesizes back at decoder side using linear prediction coefficients (LPC). These LP coefficients are sensitive and cannot be sent directly in a transmission channel. A small corruption in LPC values during transmission destroys the synthesized speech at the decoder side. We have presented new results on the stability and sensitivity of LPC based on changes in speech input pitch length, sign bit, and LPC values during transmission (or for any other reason) consecutively and simultaneously. Present analysis will help to add varying dynamic range to LSF coding. For this each individual LPC need to be related to each LSF. All the speech inputs considered in this study are voiced speech, which has been separated manually. For a specific order, we analyzed the numbers of LPC which are more responsible for increase in prediction error at decoder side when they are corrupted by noise. Present analysis provides the reference for number of bits required for quantization of LPC or line spectral pairs (LSF).
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Jatin, D., Sheshadri, T.S., Ramesh, N., Muttanna, H.K. (2014). Stability Analysis of Speech Synthesis Filter of CELP-Based AMR-WB Codec. In: Sridhar, V., Sheshadri, H., Padma, M. (eds) Emerging Research in Electronics, Computer Science and Technology. Lecture Notes in Electrical Engineering, vol 248. Springer, New Delhi. https://doi.org/10.1007/978-81-322-1157-0_18
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DOI: https://doi.org/10.1007/978-81-322-1157-0_18
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