GB1199467A – Angular Modulation Receiver.
– Google Patents
GB1199467A – Angular Modulation Receiver.
– Google Patents
Angular Modulation Receiver.
Info
Publication number
GB1199467A
GB1199467A
GB52140/67A
GB5214067A
GB1199467A
GB 1199467 A
GB1199467 A
GB 1199467A
GB 52140/67 A
GB52140/67 A
GB 52140/67A
GB 5214067 A
GB5214067 A
GB 5214067A
GB 1199467 A
GB1199467 A
GB 1199467A
Authority
GB
United Kingdom
Prior art keywords
frequency
oscillator
signal
nov
mixer
Prior art date
1966-11-18
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
GB52140/67A
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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.)
1966-11-18
Filing date
1967-11-16
Publication date
1970-07-22
1967-11-16
Application filed by International Standard Electric Corp
filed
Critical
International Standard Electric Corp
1970-07-22
Publication of GB1199467A
publication
Critical
patent/GB1199467A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
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
H03D3/24—Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits
H03D3/241—Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits the oscillator being part of a phase locked loop
H03D3/242—Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits the oscillator being part of a phase locked loop combined with means for controlling the frequency of a further oscillator, e.g. for negative frequency feedback or AFC
Abstract
1,199,467. Frequency modulation receivers. INTERNATIONAL STANDARD ELECTRIC CORP. 16 Nov., 1967 [18 Nov., 1966], No. 52140/67. Heading H3R. The signal-to-noise ratio of a FM receiver is improved by demodulating with a locked-in oscillator 1 and using this oscillator to provide negative feedback and thereby reduce the frequency deviation of the I.F. signal. In the receiver illustrated the oscillator 1 is locked to the I.F. signal by means of a phase detector 3 and a narrow-band filter 5, and supplies the local oscillations to the mixer 7 via a frequency multiplier 8. If X is the multiplication factor of the multiplier, the compression factor is also X and the relation between the RF frequency fRF and the I.F. frequency f IF is f RF = (XŒ1)f IF . If a reference frequency fRef from source 10 is supplied to the mixer, the equation becomes f RF = (XŒ1) f IF Œf Ref , which allows more choice of parameters. The output signals may be derived from filter 5 but are preferably derived from oscillator 1 via limiter discriminator 14.
GB52140/67A
1966-11-18
1967-11-16
Angular Modulation Receiver.
Expired
GB1199467A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US59539566A
1966-11-18
1966-11-18
Publications (1)
Publication Number
Publication Date
GB1199467A
true
GB1199467A
(en)
1970-07-22
Family
ID=24383079
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB52140/67A
Expired
GB1199467A
(en)
1966-11-18
1967-11-16
Angular Modulation Receiver.
Country Status (4)
Country
Link
US
(1)
US3530383A
(en)
DE
(1)
DE1295027B
(en)
GB
(1)
GB1199467A
(en)
NL
(1)
NL6715697A
(en)
Families Citing this family (6)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3866122A
(en)
*
1973-01-02
1975-02-11
Itt
FM communication system
US3917906A
(en)
*
1973-06-13
1975-11-04
Coastcom Inc
System for multiplexing information channels adjacent to a video spectrum
US4086593A
(en)
*
1976-04-09
1978-04-25
Rockwell International Corporation
AM removal and phaselock receiver
US4302626A
(en)
*
1977-03-21
1981-11-24
Magnavox Consumer Electronics Company
Low frequency AM stereophonic broadcast and receiving apparatus
DE3515746A1
(en)
*
1985-05-02
1986-11-06
Robert Bosch Gmbh, 7000 Stuttgart
FM RADIO RECEIVER
US5036291A
(en)
*
1990-05-11
1991-07-30
General Instrument Corporation
On channel agile FM demodulator
Family Cites Families (4)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US2205762A
(en)
*
1936-11-16
1940-06-25
Rca Corp
Variable band width receiver
US3221260A
(en)
*
1960-12-01
1965-11-30
Bendix Corp
Frequency discriminator
GB1004253A
(en)
*
1962-02-27
1965-09-15
Westinghouse Canada Ltd
Self starting regenerative divider
US3371281A
(en)
*
1963-10-24
1968-02-27
Gen Electric
Frequency modulation receiver combining frequency feedback and synchronous detection
1966
1966-11-18
US
US595395A
patent/US3530383A/en
not_active
Expired – Lifetime
1967
1967-11-11
DE
DEI35004A
patent/DE1295027B/en
active
Pending
1967-11-16
GB
GB52140/67A
patent/GB1199467A/en
not_active
Expired
1967-11-17
NL
NL6715697A
patent/NL6715697A/xx
unknown
Also Published As
Publication number
Publication date
NL6715697A
(en)
1968-05-20
US3530383A
(en)
1970-09-22
DE1295027B
(en)
1969-05-14
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Legal Events
Date
Code
Title
Description
1970-12-02
PS
Patent sealed [section 19, patents act 1949]
1972-06-07
PLNP
Patent lapsed through nonpayment of renewal fees
