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1992-01-14
Communication of a voice signal via continuous quadrature amplitude modulator
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1987-02-17
Full duplex frequency division multiplex communication system
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2019-08-22
Bpsk demodulation
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1981-05-28
Radio transmitter/receiver for digital and analogue communciations system
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1974-09-25
Digital communication systems
GB2070897B
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1984-11-21
Receivers suitable for use in remotelyoperable switching devices and data transmission systems
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1963-06-16
Instalación transmisora para la transmisión de señales de impulsos en una banda de transmisión
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1970-08-04
Vestigial sideband transmission system having two channels in quadrature
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1984-10-30
Single channel duplex communication system
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1964-03-01
Instalaciën transmisora para la transmisiën de senales de impulsos en una banda de transmisiën prescrita
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1948-04-06
Pulse communication system employing pulse frequency reduction for signaling
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1969-09-09
Vestigial sideband frequency shift keying modem
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1961-04-11
Method and system for transmitting data
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1973-05-29
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1964-10-06
Bipolar binary digital data vestigial sideband system
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1977-02-01
Digital communication system
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2006-06-01
Data transmission device using SAW filters
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1982-03-09
Secret communication system
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1970-01-27
Differential phase modulated communication system
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1947-09-30
Single carrier telephone and telegraph pulse multiplex system
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1984-07-17
Transmitter and receiver for transmitting digital signals
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1971-05-04
Carrier frequency phase-readjustment device
SU886286A1
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1981-11-30
Способ приема-передачи информации
KR930003282B1
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1993-04-24
데이타 신호 전송 시스팀
SU478444A2
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1975-07-25
Лини многоканальной св зи через многолучевой тракт с переменными параметрами при разделении каналов