RADIO RESEARCH LABORATORIES (RRL)

Ministry of Posts and Telecommunications

After March, 1988:
Communications Research Laboratory
Ministry of Posts and Telecommunications
2-1, Nukui-Kitamachi 4-chome, Koganei-shi
Tokyo, 184 JAPAN
 
 
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PROJECT: TERMINAL ANALOG SYNTHESIS (1958 - 1960)


Terminal analog speech synthesizer controlled by a multichannel
function generator. Function generator created nine trapezoidal
control voltages, each with eight sequential breakpoints
adjustable in amplitude and time. The synthesizer was used to
study the acoustic cues of Japanese phonemes and syllables.


1959 Nakata, K., Suzuki, J., "Terminal analog speech synthesizer",
     Rev. Radio Res. Lab. (Tokyo), Vol 5, No. 20, 149-155, July
     1959, in Japanese with English abstract, and 1-page
     "Specification of Terminal Analog Synthesizer", in English.
     In SSSHP 79 Reprints.


     Nakata,K., Suzuki,J., "Synthesis and perception of Japanese
     vowels and vowel-like sounds", J. Radio Res. Lab. (Tokyo)
     6, 617-634, 1959.

     SSSHP 47.1 Tape: "Genesis of Speech Synthesis in Japan,
          Radio Research Laboratories, MPT, J. Suzuki 2-Mar-1989"
          (Japanese vowels)
          5" reel, good quality


1960 Nakata,K., "Synthesis and perception of Japanese fricative
     sounds", J. Radio Res. Lab. (Tokyo) 7, 319-333, 1960.

     SSSHP 47.2-7 Tape: "Genesis of Speech Synthesis in Japan,
          Radio Research Laboratories, MPT, J. Suzuki 2-Mar-1989"
          (syn: fric./vowel, semivowel, "hai hai, ohajou, eh soo-
           desu, uchuu-tsuusin", several words and phrase)
          5" reel, good quality


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PROJECT: ARTICULATORY SYNTHESIS (1962 - 1964)


Rules for area function transitions. Area function to formant
synthesis.


1965 Nakata,K., and T. Mitsuoka, "Phonemic transformation and
     control aspects of synthesis of connected speech," J.  Radio
     Res. Labs., 12, 171-186.  (I,K) Theoretical discussion; no
     speech was synthesized.


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PROJECT:  SPEECH ANALYSIS FOR SYNTHESIS (1969-1972)


Use of simulated formant synthesizer for analysis of glottal-
source wave, vowel analysis, formant frequency extraction. The
system was used in the unscrambling of helium speech, showing
improvement in the intelligibility and naturalness.


1969 Nakatsui, M., and J. Suzuki, "Formant frequency extraction
     using inverse filtering and moment calculation and its
     evaluation by synthesized speech," J.  Radio Research
     Laboratories, 16, 83/84, 77-93, January/March 1969. In
     SSSHP 79 Reprints.


1970 Nakatsui, M., and J. Suzuki, "Method of observation of
     glottal-source wave using digital inverse filtering in time
     domain", J. Acoust. Soc. America, 47, 2, Part 2, 664-665,
     February 1970. In SSSHP 79 Reprints.


     Takasugi, T., and J. Suzuki, "Consideration of voice source
     in 'analysis by synthesis' technique," J. Radio Research
     Laboratories, 17, 90, 153-168, March 1970. Also "Analysis by
     synthesis technique in consideration of glottal waveform".
     In SSSHP 79 Reprints.


     Nakatsui, M., and J. Suzuki, "Vowel analysis-synthesis
     system for speech research," J. Radio Research Laboratories,
     17, 90, 169-173, March 1970.  In SSSHP 79 Reprints.


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BIOGRAPHIES


T. MITSUOKA

KAZUO NAKATA  (see SSSHP JAPAN Hitachi, Ltd. file)

M. NAKATSUI

JOUJI SUZUKI

1955 Radio Research Laboratories, speech synthesis, recog.,
     analysis, transmission, helium speech, noise reduct.
1964 Ph.D., Tokyo Inst. of Tech.
1966-67 Res. Lab. Elect., Massach. Inst. Tech. (K.N. Stevens)
1985 Director, Telecom. Division of RRL
1988 Director General of Commun. Research Laboratory


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CONTRIBUTION AND REVIEW BY:

Dr. Jouji Suzuki, Director General
Communications Research Laboratory