Telegraphy – Systems – Printing
Patent
1982-05-10
1986-05-27
Cangialosi, Salvatore
Telegraphy
Systems
Printing
178 2217, 178 221, H04K 104
Patent
active
045916730
ABSTRACT:
The present invention relates to speech scrambling techniques and systems and in particular to a frequency or time domain speech scrambling technique and system which does not require any frame synchronization.
This invention is a technique and system for scrambling speech signal in frequency or time domain by means of speech analysis-synthesis techniques.
The system described above is very attractive because it has avoided the frame synchronization problem. The existing analog telephone channel can be utilized directly for transmission because bandwidth expansion is completely controllable. In addition, the "key space" is very large and a high degree of security can be achieved.
REFERENCES:
patent: 2183248 (1939-12-01), Reisz
patent: 2243089 (1941-05-01), Dudley
patent: 2411206 (1946-11-01), Guanella
patent: 2510338 (1950-06-01), Guanella
patent: 2586475 (1952-02-01), Milliquet
patent: 2726283 (1955-12-01), Di Toro
patent: 2908761 (1959-10-01), Raisbeck
patent: 2920287 (1960-01-01), Richman
patent: 3090837 (1963-05-01), Persch
patent: 3202764 (1965-08-01), Adams et al.
patent: 3341659 (1967-09-01), Stern
patent: 3638121 (1972-01-01), Spilker, Jr.
patent: 3773977 (1973-10-01), Guanella
patent: 3979558 (1976-09-01), Peterson
patent: 3995115 (1976-11-01), Kelley
patent: 4020285 (1977-04-01), Branscombe
patent: 4052565 (1977-10-01), Baxter et al.
patent: 4058094 (1978-01-01), Schmid et al.
patent: 4100374 (1978-07-01), Jayant et al.
patent: 4149035 (1979-04-01), Frutiger
patent: 4179586 (1979-12-01), Mathews, Jr. et al.
patent: 4188506 (1980-02-01), Schmid et al.
patent: 4232194 (1980-11-01), Adams
patent: 4278840 (1981-07-01), Morgan et al.
patent: 4305152 (1981-12-01), Asakawa et al.
patent: 4393276 (1983-07-01), Steele
patent: 4433211 (1984-08-01), McCalmont et al.
patent: 4443660 (1984-04-01), DeLon
"Short Term Spectral Analysis, Synthesis and Modification by Discrete Fourier Transform", IEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-25, No. 3, Jun. 1977, by Jont B. Allen.
"Digital Signal Processing", The Discrete Fourier Transform, by Alan V. Oppenhein (1972).
Digital Processing of Speech Signals, "Short-Time Fourier Analysis", by Lawrence R. Rabiner and Ronald W. Schafer, (1979), Prentice-Hall, Inc., pp. 250-354.
"A New Time Domain Speech Scrambling System Which Does Not Require Frame Synchronization", IEEE Journal on Selected Areas in Communications, vol. SAC-2, No. 3, May 1984, by Lin-Shan Lee and Ger-Chih Chou.
"A New Frequency Domain Speech Scrambling System Which Does Not Require Frame Synchronization", IEEE Transactions on Communications, vol. Com-32, No. 4, Apr. 1984, by Lin-Shan Lee, Ger-Chih Chou and Ching-Sung Chang.
"An Efficient Time Domain Sample Value Scheme Eliminated Frame Snyc. Req. For Speech . . . ", Lee et al., 11/82.
"A New Frequency Domain Speech Scrambling System Which Does Not Require Frame Synchronization", Lee et al., 12/82.
Chang Ching-Sung
Chou Ger-Chih
Lee Lin-Shan
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