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- W2567029338 abstract "A linear prediction vocoder for coding speech signals at 2.4 kilobits per second has been simulated on an HP-1000 computer system. The digitized speech signal is divided into frames of 20 ms, duration and for each frame, the voiced/unvoiced/silence decision, the pitch period if the frame is voiced and the gain of the autoregressive filter along with 10 reflection co-efficients are transmitted. Of the various analysis algorithms tested, the optimum performance is obtained using autocorrelation method for predictor co-efficient determination and inverse filtering plus Average Magnitude Difference Function algorithm for pitch extraction. Voiced/unvoiced/silence classification has been done independent of the pitch extraction algorithm to obtain a reliable classification. With these transmission parameters, the speech signal has been reconstructed using a digital speech production model.The performance of the vocoder has been evaluated using consonantal differentiation test for intelligibility measurement and a 5-point grading scale for quality measurement. Subjective evaluation using these tests indicated that a good-quality speech with 70.3% intelligibility can be obtained at 2.4 kb/s." @default.
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- W2567029338 date "1984-07-01" @default.
- W2567029338 modified "2023-09-24" @default.
- W2567029338 title "A 2.4 Kilobits Per Second Linear Prediction Vocoder" @default.
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- W2567029338 doi "https://doi.org/10.1080/03772063.1984.11453244" @default.
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