GB1335738A - Compatible four channel fm system - Google Patents

Compatible four channel fm system

Info

Publication number
GB1335738A
GB1335738A GB2226071A GB2226071A GB1335738A GB 1335738 A GB1335738 A GB 1335738A GB 2226071 A GB2226071 A GB 2226071A GB 2226071 A GB2226071 A GB 2226071A GB 1335738 A GB1335738 A GB 1335738A
Authority
GB
United Kingdom
Prior art keywords
signal
khz
subcarrier
signals
switching
Prior art date
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
GB2226071A
Other languages
English (en)
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.)
Quadracast Systems Inc
Original Assignee
Quadracast Systems Inc
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.)
Filing date
Publication date
Application filed by Quadracast Systems Inc filed Critical Quadracast Systems Inc
Publication of GB1335738A publication Critical patent/GB1335738A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/86—Arrangements characterised by the broadcast information itself
    • H04H20/88—Stereophonic broadcast systems
    • H04H20/89—Stereophonic broadcast systems using three or more audio channels, e.g. triphonic or quadraphonic

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Stereo-Broadcasting Methods (AREA)
GB2226071A 1970-04-29 1971-04-19 Compatible four channel fm system Expired GB1335738A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US3298970A 1970-04-29 1970-04-29

Publications (1)

Publication Number Publication Date
GB1335738A true GB1335738A (en) 1973-10-31

Family

ID=21867959

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2226071A Expired GB1335738A (en) 1970-04-29 1971-04-19 Compatible four channel fm system

Country Status (3)

Country Link
US (1) US3708623A (ja)
JP (2) JPS598975B1 (ja)
GB (1) GB1335738A (ja)

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3822365A (en) * 1970-04-29 1974-07-02 Matsushita Electric Corp Compatible four channel fm system
JPS5033724B1 (ja) * 1970-11-09 1975-11-01
US4282401A (en) * 1970-12-24 1981-08-04 Sansui Electric Company System for transmission and reception of discrete four channel stereo
US3934092A (en) * 1971-09-21 1976-01-20 General Electric Company Four channel stereophonic broadcasting system
US3906156A (en) * 1971-10-06 1975-09-16 Duane H Cooper Signal matrixing for directional reproduction of sound
US3970788A (en) * 1971-10-06 1976-07-20 Cooper Duane H Monaural and stereo compatible multidirectional sound matrixing
DE2261519C3 (de) * 1971-12-16 1979-12-20 Matsushita Electric Industrial Co., Ltd., Kadoma, Osaka (Japan) Vierkanal-Stereophonie-Demodulationssystem
CA1036224A (en) * 1971-12-23 1978-08-08 Tsuneo Ohkubo Four-channel stereo receiver
US3881063A (en) * 1972-01-20 1975-04-29 Victor Company Of Japan System for selectively receiving either 4-channel or- 2-channel stereophonic broadcastings
US3798377A (en) * 1972-04-07 1974-03-19 Matsushita Electric Corp Four channel fm decoder utilizing a one-of-four decoder
DE2220280C2 (de) * 1972-04-25 1974-03-07 Siemens Ag, 1000 Berlin U. 8000 Muenchen Verfahren zur Übertragung von Quadrofonie-Signalen im Frequenzband eines Stereosignals bei UKW-Rundfunk
US3814858A (en) * 1972-04-27 1974-06-04 Motorola Inc Multiplex system employing multiple quadrature subcarriers
US4316058A (en) * 1972-05-09 1982-02-16 Rca Corporation Sound field transmission system surrounding a listener
US3787629A (en) * 1972-05-09 1974-01-22 Rca Corp Apparatus for distinguishing between various fm broadcast multiplex transmissions
JPS5332643B2 (ja) * 1972-06-06 1978-09-09
US3944747A (en) * 1972-08-24 1976-03-16 Zenith Radio Corporation Multiple channel FM stereo system
JPS5315602B2 (ja) * 1972-09-29 1978-05-26
US4190737A (en) * 1972-12-29 1980-02-26 Matsushita Electric Corp. Of America Compatible four channel FM system
US3967069A (en) * 1972-12-29 1976-06-29 Matsushita Electric Corporation Of America Compatible four channel FM system
US3896268A (en) * 1973-05-29 1975-07-22 Sencore Inc Circuit for generating a stereo pilot signal
US4027107A (en) * 1973-09-28 1977-05-31 Zenith Radio Corporation Multiple channel FM stereo system
US3902018A (en) * 1973-12-03 1975-08-26 Zenith Radio Corp Multiple channel fm stereo system employing am vestigial sideband subcarrier modulation
JPS5822892B2 (ja) * 1974-02-25 1983-05-12 ソニー株式会社 ４ チヤンネルステレオゴウセイシンゴウノ ハンベツカイロ
US3943294A (en) * 1974-06-21 1976-03-09 Quadracast Systems, Inc. Multi-mono FM system
JPS589615B2 (ja) * 1974-12-16 1983-02-22 ソニー株式会社 Ｆｍ ステレオフクチヨウホウシキ
US4004095A (en) * 1975-01-14 1977-01-18 Vincent Cardone System for time sharing an audio amplifier
US4039752A (en) * 1975-09-19 1977-08-02 Matsushita Electric Industrial Co., Ltd. Fm four channel stereo signal generator
JPH0165275U (ja) * 1987-10-20 1989-04-26
JPH02225277A (ja) * 1989-02-27 1990-09-07 Hitachi Elevator Eng & Service Co Ltd エレベータ乗りかごの昇降路位置検出装置

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1956397A (en) * 1931-02-21 1934-04-24 Communications Patents Inc Multiple channel transmission control
NL175036B (nl) * 1953-01-02 Dansk Svejsemaskine Machine voor het aanzetten van uit metaaldraad bestaande hengsels aan houders.
US2792449A (en) * 1953-07-29 1957-05-14 Bottini Allerico Device for stereophonically recording and transmitting sound waves
US3231672A (en) * 1958-10-20 1966-01-25 Philco Corp Transmission system for stereophonic signals
NL249296A (ja) * 1959-03-11
US3221098A (en) * 1962-08-15 1965-11-30 Eugene S Feldman Multiple lingual television in a multiplex broadcast system
US3466399A (en) * 1966-12-06 1969-09-09 Zenith Radio Corp Stereo receiver suitable for integrated circuit construction
US3375329A (en) * 1967-05-02 1968-03-26 Francis E Ryan Monaxial quadraphonic recording system

Also Published As

Publication number Publication date
JPS51132008A (en) 1976-11-16
JPS598975B1 (ja) 1984-02-28
US3708623A (en) 1973-01-02

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee