GB1346608A – Dual single sideband transmission system
– Google Patents
GB1346608A – Dual single sideband transmission system
– Google Patents
Dual single sideband transmission system
Info
Publication number
GB1346608A
GB1346608A
GB4009071A
GB4009071A
GB1346608A
GB 1346608 A
GB1346608 A
GB 1346608A
GB 4009071 A
GB4009071 A
GB 4009071A
GB 4009071 A
GB4009071 A
GB 4009071A
GB 1346608 A
GB1346608 A
GB 1346608A
Authority
GB
United Kingdom
Prior art keywords
khz
signals
side band
frequency
filters
Prior art date
1970-08-29
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
GB4009071A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries 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.)
1970-08-29
Filing date
1971-08-26
Publication date
1974-02-13
1971-08-26
Application filed by Philips Electronic and Associated Industries Ltd
filed
Critical
Philips Electronic and Associated Industries Ltd
1974-02-13
Publication of GB1346608A
publication
Critical
patent/GB1346608A/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
H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
H04L25/00—Baseband systems
H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
H04L25/40—Transmitting circuits; Receiving circuits
H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
H04L25/4917—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes
H04L25/4923—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes using ternary codes
H04L25/4925—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes using ternary codes using balanced bipolar ternary codes
Abstract
1346608 Digital transmission; amplitude modulation PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 26 Aug 1971 [29 Aug 1970] 40090/71 Heading H4P A synchronized transmission system has two pilot carriers for transmitting clock pulses and dual single sideband channels on either side each modulated by a coder converting binary pulse signals into multi level signals which feed a low pass filter and single side band modulator connected in cascade. The outputs of the single side band modulators are applied to a combining device producing dual single side band signals. The ratio of clock frequency and frequency difference of pilot carriers is an integer. At the receiver modulation is performed by dual single side band demodulators controlled by local carrier signals of differing frequency derived from the pilot carriers, the demodulators feeding decoders clocked by recovered pulses. At the transmitter binary pulse signals from source 3 through series-parallel converter 27 controlled by multiplied clock pulses from oscillator 7 at 40 kHz are modulated at 4 into a frequency band of 60-108 kHz then combined with pilot signals at 5. Clock pulse generator 2 comprises oscillator 7 of frequency say 24 kHz whose output line incorporates a frequency multiplier 8. Series parallel converter 27 includes AND gates 28, 29 which receive signals 3 directly through AND gate 28 also through delay 30 controlled by output pulses from frequency multiplier to AND gate 29, alternate information pulses being routed through pulse wideners 31, 32 to coders 19, 20. Each coder comprises a modulo-2 adder 33 applied to a difference producer 34 and delay network 35 of two clock periods which has inputs to adder 33 and producer 34. Modulator 4 is fed through low pass filters 21, 22 and comprises single side band modulators 23, 24 receiving carrier signals 25, 26 at frequencies of say 87, 81 kHz. By suppressing spectral components above 12 kHz in 1.p. filters 21, 22, signals occur at the output suitable for single side band modulation at 23, 24 each comprising a cascade circuit of a push-pull modulator 36, 37 and single side band filters 38, 39, the pass bands of which are 87-99 and 69-81 kHz respectively. These are passed to combining device 5 emitting dual side band signals with a frequency space of 6 kHz for transmission of pilot signals of say 81 and 87 kHz providing carrier and clock signals. These are derived from oscillator 9 directly at 81 kHz and indirectly by mixing through ¸4 divider 40 from oscillator 7 through filter 42 providing 87 kHz; clock signals of 24 kHz may be recovered by multiplying the difference frequency by 4. To avoid cross talk only a portion of the upper side band of modulator 37 located in the band 87-99 kHz is fully suppressed in filter 39. It is stated that due to simplicity of filter construction noticeable phase shifts are not introduced and that four speech channels can be transmitted between 60-69 and 99-108 kHz bands. At the receiver, Fig. 2, two single side band demodulators 43, 44 in parallel are controlled by carriers of 87, 81 kHz and decoders 47, 48 by clock pulses of 24 kHz. Clock pulses plus carriers are recovered through filters 15, 16 mixer 49 and output filter 50 through x 4 frequency multiplier 51. Demodulators 43, 44 are constituted by input band pass filters 52, 53 push pull modulators 54, 55 followed by 12 kHz 1.p. filters 56, 57. Filters 52, 53 select side bands of 87-99 and 69-81 kHz which provide ternary pulse signals limited to a band of 0-12 kHz after demodulation from the outputs of 1.p. filters 56, 57. These are converted at 47, 48 by means of twophase rectifiers 58, 59 into binary pulse signals which are regenerated at 60, 61 controlled by clock signals and pass to a parallel/series converter comprising a OR gate 63 fed directly also through a delay 64 comprising a shift register. Alternate bits are interleaved at 63 and passed to a receiver 13. In Fig. 7 (not shown) based on Specification 1,346,607 coders 19, 20 are arranged to convert into seven levels, and comprise a code converter (70-72) providing a ternary pulse series which can be multiplied by factors of 2 or 3 giving – 3, to + 3 levels derived from the output of a linear adder (75). At a coresponding receiver, Fig. 8 (not shown), decoder 47 is provided with a twophase rectifier 58 and level separator (76) and pulse group former (77) connected to a series/ parallel shift register (64) controlled at 96 kHz. A single side band modulation method described in Specification 1,143,758 may be used alternatively; it is possible to convert binary signals to ternary by using a digital filter as disclosed in Specification 1,143,758. Two independent information signals each of 24 kHz may be transmitted by applying these to channels 17, 18 which are not then commoned at the input.
GB4009071A
1970-08-29
1971-08-26
Dual single sideband transmission system
Expired
GB1346608A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
NL7012827A
NL7012827A
(en)
1970-08-29
1970-08-29
Publications (1)
Publication Number
Publication Date
GB1346608A
true
GB1346608A
(en)
1974-02-13
Family
ID=19810891
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB4009071A
Expired
GB1346608A
(en)
1970-08-29
1971-08-26
Dual single sideband transmission system
Country Status (11)
Country
Link
US
(1)
US3701852A
(en)
JP
(1)
JPS5237329B1
(en)
AU
(1)
AU456304B2
(en)
BE
(1)
BE771915A
(en)
CA
(1)
CA960311A
(en)
CH
(1)
CH532344A
(en)
DE
(1)
DE2141484B2
(en)
FR
(1)
FR2103605B1
(en)
GB
(1)
GB1346608A
(en)
NL
(1)
NL7012827A
(en)
SE
(1)
SE368496B
(en)
Families Citing this family (8)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US4131850A
(en)
*
1977-02-18
1978-12-26
Glade Wilcox
Single side band radio apparatus
US4335464A
(en)
*
1980-01-24
1982-06-15
Paradyne Corporation
Dual multipoint data transmission system modem
US4912773A
(en)
*
1982-09-21
1990-03-27
General Electric Company
Communications system utilizing a pilot signal and a modulated signal
DE3237619C2
(en)
*
1982-10-11
1985-04-18
Karl Dipl.-Phys. Dr. 3550 Marburg Meinzer
Method and device for digital data transmission
US4881245A
(en)
*
1983-07-01
1989-11-14
Harris Corporation
Improved signalling method and apparatus
US4630286A
(en)
*
1984-10-10
1986-12-16
Paradyne Corporation
Device for synchronization of multiple telephone circuits
US4734920A
(en)
*
1984-10-10
1988-03-29
Paradyne Corporation
High speed modem for multiple communication circuits
KR20210057416A
(en)
*
2019-11-12
2021-05-21
삼성전자주식회사
Wireless communication device and method
Family Cites Families (7)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR1482067A
(en)
*
1965-03-20
1967-05-26
Philips Nv
Pulse transmission system
FR88796E
(en)
*
1965-05-05
1967-06-07
FR1479698A
(en)
*
1965-05-10
1967-05-05
Fond Hasler Werke
Method for the transmission of telegraph signals by means of a modulated carrier
DE1274663C2
(en)
*
1965-05-24
1980-09-18
Siemens Ag
STRUCTURE OF THE BASIC PRIMARY GROUP OF A SINGLE-SAND BAND CARRIER FREQUENCY SYSTEM THROUGH A PRE-MODULATION LEVEL
FR1528362A
(en)
*
1966-06-23
1968-06-07
Siemens Ag
Stereophonic program transmission system
GB1161003A
(en)
*
1966-12-22
1969-08-13
Ass Elect Ind
Improvements relating to Data Transmission Systems
NL7001968A
(en)
*
1970-02-12
1971-08-16
1970
1970-08-29
NL
NL7012827A
patent/NL7012827A/xx
unknown
1971
1971-08-19
DE
DE2141484A
patent/DE2141484B2/en
not_active
Withdrawn
1971-08-23
US
US173877A
patent/US3701852A/en
not_active
Expired – Lifetime
1971-08-24
CA
CA121,178A
patent/CA960311A/en
not_active
Expired
1971-08-25
AU
AU32688/71A
patent/AU456304B2/en
not_active
Expired
1971-08-26
SE
SE10805/71A
patent/SE368496B/xx
unknown
1971-08-26
FR
FR7131000A
patent/FR2103605B1/fr
not_active
Expired
1971-08-26
CH
CH1260971A
patent/CH532344A/en
not_active
IP Right Cessation
1971-08-26
GB
GB4009071A
patent/GB1346608A/en
not_active
Expired
1971-08-27
BE
BE771915A
patent/BE771915A/en
unknown
1971-08-28
JP
JP46065601A
patent/JPS5237329B1/ja
active
Pending
Also Published As
Publication number
Publication date
US3701852A
(en)
1972-10-31
DE2141484A1
(en)
1972-03-02
JPS5237329B1
(en)
1977-09-21
FR2103605B1
(en)
1976-05-28
SE368496B
(en)
1974-07-01
AU3268871A
(en)
1973-03-01
DE2141484B2
(en)
1980-05-29
FR2103605A1
(en)
1972-04-14
NL7012827A
(en)
1972-03-02
CA960311A
(en)
1974-12-31
CH532344A
(en)
1972-12-31
BE771915A
(en)
1972-02-28
AU456304B2
(en)
1974-12-12
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Legal Events
Date
Code
Title
Description
1974-07-03
PS
Patent sealed [section 19, patents act 1949]
1981-04-01
PCNP
Patent ceased through non-payment of renewal fee
