Speech digitizer

Details Speech digitizer Speech digitizer

1978-05-25

1980-10-28

Morrison, Malcolm A.

179 1SC, G10L 100

Patent

active

042309069

ABSTRACT:
A speech digitizer is disclosed including an analyzer for generating power and filter coefficient parameters representative of an analog speech waveform. The digitizer also includes a pitch detector for generating a digital pitch parameter substantially representing the fundamental periodicity of the waveform and including range restrictor means for restricting the pitch signal to a range of pitches within a predetermined tolerance if the average pitch of the periodicity signal is below a predetermined level. The pitch detector also includes means for determining the number of extreme maximum and minimum points within a predetermined range of an absolute magnitude difference function thereby generating a structure number signal representing a voiced event. The digitizer includes a voicing detector for generating a three-level voicing/unvoicing parameter representing whether the speech waveform is voiced or unvoiced.

REFERENCES:
patent: 3903366 (1975-09-01), Coulter
patent: 3947638 (1976-03-01), Blankenship
patent: 4058676 (1977-11-01), Wilkes et al.
patent: 4074069 (1978-02-01), Tokura
L. Rabiner, et al., "A Comparative Study of Pitch Algorithms", IEEE Trans. Acoustics, Sp., Sig. Prod., Oct. 1976.
B. Gold, "Digital Speech Networks", Proc. IEEE, Dec. 1977.

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