Pitch synchronous 1st-order linear d.p.c.m. system

Pitch synchronous 1st-order linear d.p.c.m. system

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A system called p.s.f.o.l.d. is described which exploits the correlation between successive pitch periods of a speech signal. This system is a differential one and can employ various types of encoders. We describe a p.s.f.o.l.d. system using a 1st-order d.p.c.m. encoder and show that for a speech utterance this system has a peak signal/noise ratio which is 6 dB larger, and has an increase in dynamic range of 13 dB, compared with a 1st-order d.p.c.m. codec.


    1. 1)
      • N.S. Jayant . Digital coding of speech waveforms: PCM, DPCM and DM quantizers. Proc. Inst. Elec. Electron. Eng. , 611 - 632
    2. 2)
      • P. Noll . Speech encoding: A comparative study of various quantization schemes. Bell Syst. Tech. J.
    3. 3)
      • L.H. Zetterburg , J. Uddenfeldt . Adaptive delta modulation with delayed decision. IEEE. Trans. , 1195 - 1198
    4. 4)
      • J.B. Anderson , J.B. Bodie . Tree encoding of speech. IEEE. Trans. , 4
    5. 5)
      • P. Ryder . (1977) , Private communication.
    6. 6)
      • R. Steele . (1975) , Delta modulation systems.
    7. 7)
      • P. Cummiskey , N.S. Jayant , J.L. Flanagan . Adaptive quantization in differential pcm coding of speech. Bell Syst. Tech. J. , 1105 - 1118

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