Scalar coprocessors for accelerating the G723.1 and G729A speech coders - Consumer Electronics, IEEE Transactions on

Scalar coprocessors for accelerating the G723.1 and G729A speech coders

We investigate two scalar coprocessors for accelerating the ITU-T G723.1 and G729A speech coders. Architecture space exploration indicates up to 72% reduction in the total number of instructions executed through the introduction of custom instructions and small changes to the C reference code. The accelerators are designed to be attached to a configurable embedded RISC CPU where they make use o...

Configurable Scalar and Vector Coprocessors for Accelerating the G.723.1 and G.729a Speech Coders

This paper presents the results of an investigation of employing configurable scalar and vector coprocessors to accelerate the G.723.1 and the G.729A speech coders. Architecture exploration has produced a reduction by up to 70% of the total number of instructions executed following the introduction of custom instructions. The accelerators are designed to be attached to a configurable embedded R...

The effect of speech and audio compression on speech recognition performance

This paper proposes an in-depth look at the influence of different speech and audio codecs on the performance of our continuous speech recognition engine. GSM full rate, G711, G723.1 and MPEG coders are investigated. It is shown that MPEG transcoding degrades the speech recognition performance for low bitrates whereas performance remains acceptable for specialized speech coders like GSM or G711...

A voicing-driven packet loss recovery algorithm for analysis-by-synthesis predictive speech coders over Internet

In this paper, a novel voicing-driven adaptive packet loss recovery algorithm is proposed to lessen the possible voice degradation and error propagation for analysis-by-synthesis speech coders in Internet applications. After voicing classification, we adaptively adopt random noise generation, multiresolution excitation generation, or pulse tracking procedure to recover the lost packets. By appl...

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