SIGNALS RESEARCH AND DEVELOPMENT ESTABLISHMENT (SRDE)
Christchurch, England
1976 Became part of new Royal Signals and Radar Establishment (RSRE)
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HISTORY OF THE ORGANIZATION
The Signals Research and Development Establishment (SRDE) evolved
from early government laboratories for military telecommunications
and radar. By 1949, SRDE was funded by the Ministry of Supply to
investigate methods of speech bandwidth compression for encryption
security of military messages. A second benefit of the work would
be in techniques for more efficient use of communication facilities,
particularly transatlantic cables. SRDE conducted some research,
itself, and supervised contract research at other laboratories.
1991 ("An interview with Adrian Fourcin, Professor of Experimental
Phonetics at University College London", Roger Bridgman, Science
Museum London, Dec. 10, 1991. Transcription SSSHP 105, in SSSHP
UK Univ. College file.)
Professor Fourcin reviews his education and career, including
the National Physical Laboratory, Imperial College with
Dennis Gabor and Colin Cherry, CNRS in France with Marcou and
Daguet, Signals Research and Development Establishment with
Walter Lawrence and Ralph Eades on speech synthesis, a visit
to Haskins Laboratories, NY, on pitch perception, and finally
University College London, on speech and hearing science with
Dennis Fry.
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PROJECT: PAT - PARAMETRIC ARTIFICIAL TALKER (1949? - 1961)
A study of speech bandwidth compression by encoding formant
information. Two-way communication devices were later called
"formant-tracking vocoders". PAT was a model of the destination
device, the vocoder synthesizer, but artificially controlled
from a multi-channel function generator.
First parallel resonance (formant) synthesizer. Glass slide with
four painted patterns was used to generate six time functions to
control the speech synthesizer: three formant frequencies, voice
on/off & fundamental frequency, and noise on/off. The glass slide
was scanned with a "flying-spot" cathode ray tube light source and
photo-electric cell. Formant waveforms created by heterodyning an
amplitude-modulated 10 kHz wave with a fixed-amplitude variable-
frequency oscillator.
1953 Lawrence, W., "The synthesis of speech from signals which
have a low information rate", COMMUNICATION THEORY, ed. by
Willis Jackson, Butterworth & Co., Ltd., 460-469 (1953)
(B,I,K)
Tape? ("How d'you do?")
19?? Lawrence, W., "The use of synthetic speech as an aid to the
study of speech apprehension," tape-recorded lecture. Copy
of tape dated 12/15/61 from the Univ. of Michigan, Comm. Sci.
Lab.
SSSHP 119.1 Tape: "Lawrence-PAT/U of M, 12-15-61"
(Lecture, PAT driven from 6-contour pattern;
syn: "What did you say before that?, variations")
7" reel, 7 1/2 ips, good quality, 3rd gen copy
(Maxey Tape T61.1) Another copy on SSSHP 120.10.
1956 Lawrence, W., joint presentation with G. Fant and OVE-I at
MIT conference in Cambridge, MA. Conversation between PAT and
OVE-I hardware on stage at the conference.
According to F.S. Cooper, at a later demonstration
Lawrence was the subject of a friendly spoof of his
synthesizer, by J.C.R. Licklider. After Lawrence
had finished his demonstration, turned off the equip-
ment, and sat down, a hidden speaker suddenly burst
forth with a torrent of "What did you say before that?",
seemingly from the unpowered PAT.
SSSHP 83.8 Tape: "Some Reminiscences on Speech Research",
F.S. Cooper, demo with IEEE Trans. A&E, AU-21.3, 6/73.
(OVE: "How are you?"; PAT: "What did you say before
that?"; OVE: "I love you."; PAT: "What did you say
before that?"; OVE: "How are you?"; PAT, normal and
whispered: "What did you say before that?"; OVE: "I
love you."; PAT, singing: "What did you say before
that?")
Cassette from plastic record, stylus noise
SSSHP 90.5a Tape: "MIT - MACHINES THAT TALK, Spring 1960"
(syn, x3: "What did you say before that? Tea or
coffee? Half an hour. Shut the door. What have you
done with it?")
(syn, var syn settings: "What have you done with it?")
7" reel, 7.5 ips, good quality, copy of MIT 7-36
**** use for master ****
SSSHP 32.3 Tape: Demo to accompany "Review of text-to-speech
conversion for English," D.H. Klatt, JASA 82.3, Sept.
1987.
(syn: "What did you say before that? Tea or coffee.
What have you done with it?")
Cassette, Klatt MIT A/D and D/A conversion of SSSHP
90.5a
1957 A new conductive-ink/resistive-roller function generator
for PAT, by Adrian J. Fourcin. (See SSSHP SWEDEN RIT and
SSSHP USA MELPAR for later function generators of this type.)
ARTIFACT: One model has been offered to the Smithsonian
by Prof. Fourcin
1960 Fourcin, A., "A Potential Dividing Function Generator for
the Control of Speech Synthesis", J. Acoust. Soc. Amer.,
32, 11, p.1501, Nov. 1960 (Abstract).
********* is there a written paper? **************
1960 Lawrence, W., "Parametric artificial talking device", J.
Acoust. Soc. Amer., 32, 11, p.1501, Nov. 1960 (Abstract).
Serial or parallel PAT, 12-channel function generator with
conductive ink and resistive rollers. Two of the first
utterances of PAT with this more elaborate control.
**** is there a written paper? ****
SSSHP 90.5a Tape: "MIT - MACHINES THAT TALK, Spring 1960"
(syn, x3: "Do you understand what I say to you? Eye
on Research.")
7" reel, 7.5 ips, good quality, copy of MIT 7-36
**** use for master ****
1962 Anthony, J., and W. Lawrence, "A resonance analogue speech
synthesizer", Proc. Fourth Int. Congr. Acoustics, Paper G43,
Copenhagen, Organization Committee (1962). A later model of
PAT at the Univ. of Edinburgh. Contains drawing of the
Fourcin function generator from SRDE.
1962 Anthony, J.K.F., Stockholm Speech Communication Seminar.
Synthesis from function generator: PAT, Phonetics Dept.,
Edinburgh Univ., Scotland.
SSSHP 125.9 "SCS - 1962/Stockholm Vocoder Demo Tape Sept. 1962".
(syn, M-male, F-female):
"Welcome to the Stockholm Speech Communication Seminar." (M)
(23 CV's, female, then male)
"Hello." (F)
"Hello, is Docent Fant there?" (M)
"No, he isn't, he is out right now. Can I take a message? (F)
"Yes, please. Would you ask him to call 23 65 20. (M)
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BIOGRAPHIES
JAMES ANTHONY (See SSSHP UK University of Edinburgh)
ADRIAN J. FOURCIN (See SSSHP UK University College London)
WALTER LAWRENCE
education
employment
195? SRDE
1957 Senior Principal Scientific Officer, SRDE
1965 retired from SRDE
1965 Senior Lecturer, Univ. of Edinburgh, with David Abercrombie
1984 Deceased
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