GB1172975A – Improvements in or relating to Demodulation Systems
– Google Patents
GB1172975A – Improvements in or relating to Demodulation Systems
– Google Patents
Improvements in or relating to Demodulation Systems
Info
Publication number
GB1172975A
GB1172975A
GB843569A
GB843569A
GB1172975A
GB 1172975 A
GB1172975 A
GB 1172975A
GB 843569 A
GB843569 A
GB 843569A
GB 843569 A
GB843569 A
GB 843569A
GB 1172975 A
GB1172975 A
GB 1172975A
Authority
GB
United Kingdom
Prior art keywords
signal
filtered
circuit
multiplying
nov
Prior art date
1965-11-23
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB843569A
Inventor
Ralph Bertrand Herman
William Renwick
Leonard Charles Walters
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Plessey Co Ltd
Original Assignee
Plessey Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1965-11-23
Filing date
1965-11-23
Publication date
1969-12-03
1965-11-23
Application filed by Plessey Co Ltd
filed
Critical
Plessey Co Ltd
1965-11-23
Priority to GB843569A
priority
Critical
patent/GB1172975A/en
1965-11-23
Priority claimed from GB49825/65A
external-priority
patent/GB1172974A/en
1969-12-03
Publication of GB1172975A
publication
Critical
patent/GB1172975A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
H04L27/00—Modulated-carrier systems
H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
H04L27/14—Demodulator circuits; Receiver circuits
H04L27/144—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements
H04L27/152—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements using controlled oscillators, e.g. PLL arrangements
H04L27/1525—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements using controlled oscillators, e.g. PLL arrangements using quadrature demodulation
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
H04L27/00—Modulated-carrier systems
H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
H04L27/06—Demodulator circuits; Receiver circuits
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
H04L27/00—Modulated-carrier systems
H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
H04L27/20—Modulator circuits; Transmitter circuits
H04L27/2003—Modulator circuits; Transmitter circuits for continuous phase modulation
H04L27/2007—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change within each symbol period is constrained
H04L27/2014—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change within each symbol period is constrained in which the phase changes in a piecewise linear manner during each symbol period, e.g. minimum shift keying, fast frequency shift keying
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
H04L27/00—Modulated-carrier systems
H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
Abstract
1,172,975. Demodulators. PLESSEY CO. Ltd. 23 Nov., 1966 [23 Nov., 1965], No.8435/69. Divided out of 1,172,974. Headings H3A and H3Q. A quadrature demodulator comprises: means 40, 41 for multiplying a received modulated signal with quadrature carrier frequency signals from source 42; means 44, 45 for filtering the outputs from the two multipliers; means 48 for squaring one of the two filtered signals; means 50 for sampling the other filtered signal at transition points in the sampled signal; a bistable circuit 51 arranged so that its state is determined by the sign of the previous sample; and means 52 for multiplying the squared signal by the output from the bi-stable circuit. The frequency of the source 42 is controlled by a signal derived from the filtered product of the outputs from filters 44, 45 by means of multiplier 46 and filter 47. The circuit may be used in conjunction with a modulator of the type described in Specification 1,172,976.
GB843569A
1965-11-23
1965-11-23
Improvements in or relating to Demodulation Systems
Expired
GB1172975A
(en)
Priority Applications (1)
Application Number
Priority Date
Filing Date
Title
GB843569A
GB1172975A
(en)
1965-11-23
1965-11-23
Improvements in or relating to Demodulation Systems
Applications Claiming Priority (2)
Application Number
Priority Date
Filing Date
Title
GB49825/65A
GB1172974A
(en)
1965-11-23
1965-11-23
Improvements in or relating to Modulation Systems
GB843569A
GB1172975A
(en)
1965-11-23
1965-11-23
Improvements in or relating to Demodulation Systems
Publications (1)
Publication Number
Publication Date
GB1172975A
true
GB1172975A
(en)
1969-12-03
Family
ID=26242168
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB843569A
Expired
GB1172975A
(en)
1965-11-23
1965-11-23
Improvements in or relating to Demodulation Systems
Country Status (1)
Country
Link
GB
(1)
GB1172975A
(en)
Cited By (6)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE2711476A1
(en)
*
1976-03-16
1977-09-22
Plessey Handel Investment Ag
DUPLEX TRANSMITTER / RECEIVER DEVICE WORKING IN A COMMON CHANNEL
GB2000401A
(en)
*
1977-06-17
1979-01-04
Sony Corp
Signal level detecting circuits automatic gain control circuits automatic colour control circuits for colour television receivers and colour television receivers
EP0147120A2
(en)
*
1983-12-12
1985-07-03
International Standard Electric Corporation
A zero if demodulator and method of demodulation
WO1986003643A1
(en)
*
1984-12-07
1986-06-19
Gesellschaft Zur Förderung Der Industrieorientiert
Method and circuit for detecting the information contained in a received signal
GB2300318A
(en)
*
1981-02-10
1996-10-30
Plessey Co Ltd
Improvements in or relating to transceivers
GB2380641A
(en)
*
2001-09-14
2003-04-09
Roke Manor Research
common channel transceiver, which can reduce the noise from the transmitter antenna, appearing on the receiver antenna by using a digital filtering stage
1965
1965-11-23
GB
GB843569A
patent/GB1172975A/en
not_active
Expired
Cited By (11)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE2711476A1
(en)
*
1976-03-16
1977-09-22
Plessey Handel Investment Ag
DUPLEX TRANSMITTER / RECEIVER DEVICE WORKING IN A COMMON CHANNEL
GB2000401A
(en)
*
1977-06-17
1979-01-04
Sony Corp
Signal level detecting circuits automatic gain control circuits automatic colour control circuits for colour television receivers and colour television receivers
GB2000401B
(en)
*
1977-06-17
1982-02-03
Sony Corp
Signal level detecting circuits automatic gain control circuits automatic colour control circuits for colour television receivers and colour television receivers
GB2300318A
(en)
*
1981-02-10
1996-10-30
Plessey Co Ltd
Improvements in or relating to transceivers
GB2300318B
(en)
*
1981-02-10
1997-03-19
Plessey Co Ltd
Improvements in or relating to transceivers
EP0147120A2
(en)
*
1983-12-12
1985-07-03
International Standard Electric Corporation
A zero if demodulator and method of demodulation
EP0147120A3
(en)
*
1983-12-12
1987-04-22
International Standard Electric Corporation
A zero if demodulator and method of demodulation
WO1986003643A1
(en)
*
1984-12-07
1986-06-19
Gesellschaft Zur Förderung Der Industrieorientiert
Method and circuit for detecting the information contained in a received signal
US4745627A
(en)
*
1984-12-07
1988-05-17
Gesellschaft Zur Forderung Der Industrieorientierten Forschung An Den Schweizerischen Hochschulen Und Weiteren Institutionen
Procedure and circuit for detection of the information of a received signal
GB2380641A
(en)
*
2001-09-14
2003-04-09
Roke Manor Research
common channel transceiver, which can reduce the noise from the transmitter antenna, appearing on the receiver antenna by using a digital filtering stage
GB2380641B
(en)
*
2001-09-14
2004-03-24
Roke Manor Research
Transceiver
Similar Documents
Publication
Publication Date
Title
GB1251851A
(en)
1971-11-03
JPS5461822A
(en)
1979-05-18
Transmitter circuit
GB1172975A
(en)
1969-12-03
Improvements in or relating to Demodulation Systems
GB1309054A
(en)
1973-03-07
Receiver for single sedeband amplitude modulated waves
GB1304188A
(en)
1973-01-24
GB1312991A
(en)
1973-04-11
Phase detection system for at least one digital phase modulated wave
GB1366317A
(en)
1974-09-11
Synchronous demodulator
KR900019338A
(en)
1990-12-24
FM signal demodulator
US3517338A
(en)
1970-06-23
Duo-binary frequency modulators
GB979865A
(en)
1965-01-06
Improvements in or relating to pulse-counting detector circuits
GB1323446A
(en)
1973-07-18
Data communication system
US3810161A
(en)
1974-05-07
Apparatus for receiving a frequency and phase coded vehicle control signal
GB1252266A
(en)
1971-11-03
FR2265216A1
(en)
1975-10-17
Demodulator for F.M. auxiliary colour carrier – with signal to be demodulated applied to two inputs of a multiplier
GB1172977A
(en)
1969-12-03
Improvements in or relating to Demodulation Systems
GB1296518A
(en)
1972-11-15
GB1449866A
(en)
1976-09-15
System for detecting a digital phase-modulated wave
GB850139A
(en)
1960-09-28
Recirculating delay line
GB1368419A
(en)
1974-09-25
Crystal controlled frequency discriminator
JPS5355938A
(en)
1978-05-20
Digiral filter
GB1488911A
(en)
1977-10-19
Digital data transmission systems
GB1506008A
(en)
1978-04-05
Digital-signal modulation and filtering arrangement
SU930735A1
(en)
1982-05-23
Device for demodulation of frequency-shift keying signals
JPS5573164A
(en)
1980-06-02
Synchronous demodulation system of msk signal
Beynon
1971
A 10-GHz Single Sideband Modulator With 1-kHz Frequency Shift(Correspondence)
Legal Events
Date
Code
Title
Description
1970-04-15
PS
Patent sealed
1976-06-16
PLNP
Patent lapsed through nonpayment of renewal fees
