Noise reduction in ADPCM AQJ systems using quantiser correction at the receiver

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Noise reduction in ADPCM AQJ systems using quantiser correction at the receiver

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© The Institution of Electrical Engineers
Published

A technique is considered which reduces the output noise in ADPCM-AQJ speech coders. Computer simulation results indicate a subjectively perceptible enhancement in the quality of the recovered speech.

Inspec keywords: speech analysis and processing; interference suppression; encoding; analogue-digital conversion; pulse-code modulation

Other keywords: signal processing; receiver; one-word memory adaptive quantiser; ADPCM-AQI speech coders; noise reduction; quantiser correction; speech quality enhancement; adaptive DPCM

Subjects: Speech and audio signal processing; Codes

References

    1. 1)
      • Xydeas, C.S., Evci, C.C.: `A comparative study of DPCM-AQF speech coders for bit rates of 16–32 Kbps', Proceedings ICASSP, May 1982, .
    2. 2)
      • C.S. Xydeas , C.C. Evci , R. Steele . Sequential adaptive predictors for ADPCM speech coders. IEEE Trans. , 1942 - 1954
    3. 3)
      • N.S. Jayant . Adaptive quantization with a one-word memory. Bell Syst. Tech. J. , 1119 - 1144
    4. 4)
      • Cohn, D.L., Melsa, J.L.: `A pitch compensating quantizer', Conference Record, 1976, p. 256–261, IEEEICASSP.
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