FR2179032B1 - - Google Patents

Info

Publication number: FR2179032B1
Authority: FR; France
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

FR7311917A

Other versions

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.)

1972-04-07

Filing date

1973-04-03

Publication date

1978-09-08

1973-04-03 Application filed by Quadracast Systems Inc filed Critical Quadracast Systems Inc

1973-11-16 Publication of FR2179032A1 publication Critical patent/FR2179032A1/fr

1978-09-08 Application granted granted Critical

1978-09-08 Publication of FR2179032B1 publication Critical patent/FR2179032B1/fr

Status 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)

FR7311917A 1972-04-07 1973-04-03 Expired FR2179032B1 (fr)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
US24207372A	1972-04-07	1972-04-07

Publications (2)

Publication Number	Publication Date
FR2179032A1 FR2179032A1 (fr)	1973-11-16
FR2179032B1 true FR2179032B1 (fr)	1978-09-08

Family

ID=22913337

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
FR7311917A Expired FR2179032B1 (fr)	1972-04-07	1973-04-03

Country Status (9)

Country	Link
US (1)	US3798377A (fr)
JP (1)	JPS561820B2 (fr)
BE (1)	BE797716A (fr)
CA (1)	CA1014625A (fr)
DE (1)	DE2317338A1 (fr)
FR (1)	FR2179032B1 (fr)
GB (1)	GB1417884A (fr)
IT (1)	IT983642B (fr)
NL (1)	NL178381C (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
JPS5343242B2 (fr) *	1973-03-19	1978-11-17
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
JPS5175105U (fr) *	1974-12-09	1976-06-12
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
FR2310672A1 (fr) *	1975-05-07	1976-12-03	Emv Elektromechanikai Vallalat	Dispositif pour la realisation d'une transmission tetraphonique compatible au moyen de sources sonores virtuelles
US4061882A (en) *	1976-08-13	1977-12-06	Quadracast Systems, Inc.	Quadrature multiplying four-channel demodulator
JPS61179338A (ja) *	1985-02-01	1986-08-12	旭化成株式会社	布製袋体
CA2054062A1 (fr) *	1990-12-11	1992-06-12	William J. Simpson	Sous-couche d'argile pour pente raide

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US3283079A (en) *	1964-07-14	1966-11-01	Collins Radio Co	Phase control network for a stereophonic system
US3584154A (en) *	1968-06-17	1971-06-08	Clarence Hunter Mcshan	Stereo multiplex decoding system with a phase locked loop switching signal control
CA997000A (en) *	1969-12-29	1976-09-14	Allen L. Limberg	Multiplex decoding system
CA1021852A (fr) *	1970-02-25	1977-11-29	Louis Dorren	Systeme fm gradriphonique compatible
US3708623A (en) *	1970-04-29	1973-01-02	Quadracast Syst Inc	Compatible four channel fm system
JPS4838001A (fr) *	1971-09-15	1973-06-05
CA984007A (en) *	1971-09-21	1976-02-17	Antal Csicsatka	Four channel stereophonic system
BE811207A (fr) *	1973-02-21	1974-06-17		Decodeur pour signal de modulation de frequence a plusieurs canaux

1972
- 1972-04-07 US US00242073A patent/US3798377A/en not_active Expired - Lifetime
1973
- 1973-03-05 CA CA165,523A patent/CA1014625A/en not_active Expired
- 1973-03-23 GB GB1422173A patent/GB1417884A/en not_active Expired
- 1973-03-30 NL NLAANVRAGE7304448,A patent/NL178381C/xx not_active IP Right Cessation
- 1973-04-03 IT IT22541/73A patent/IT983642B/it active
- 1973-04-03 DE DE2317338A patent/DE2317338A1/de not_active Ceased
- 1973-04-03 FR FR7311917A patent/FR2179032B1/fr not_active Expired
- 1973-04-03 JP JP3753473A patent/JPS561820B2/ja not_active Expired
- 1973-04-03 BE BE129596A patent/BE797716A/fr not_active IP Right Cessation

Also Published As

Publication number	Publication date
FR2179032A1 (fr)	1973-11-16
CA1014625A (en)	1977-07-26
JPS4948206A (fr)	1974-05-10
US3798377A (en)	1974-03-19
NL178381B (nl)	1985-10-01
JPS561820B2 (fr)	1981-01-16
NL178381C (nl)	1986-03-03
IT983642B (it)	1974-11-11
GB1417884A (en)	1975-12-17
DE2317338A1 (de)	1973-10-18
BE797716A (fr)	1973-07-31
NL7304448A (fr)	1973-10-09

Legal Events

Date	Code	Title	Description
1974-05-31	TP	Transmission of property
1988-02-26	ST	Notification of lapse

Publication	Publication Date	Title
FR2185311A5 (fr)	1973-12-28
CS152750B1 (fr)	1974-02-22
FR2177344A5 (fr)	1973-11-02
JPS4920353A (fr)	1974-02-22
CS163710B2 (fr)	1975-11-07
JPS5132120B2 (fr)	1976-09-10
JPS4988069A (fr)	1974-08-22
JPS4933497A (fr)	1974-03-27
JPS533984Y2 (fr)	1978-01-31
CS166846B2 (fr)	1976-03-29
JPS4937812A (fr)	1974-04-08
JPS4931495U (fr)	1974-03-18
CS166943B1 (fr)	1976-03-29
CS153299B1 (fr)	1974-02-25
JPS4920809U (fr)	1974-02-21
JPS4975095U (fr)	1974-06-28
JPS4945134U (fr)	1974-04-20
JPS4945507U (fr)	1974-04-22
CS153317B1 (fr)	1974-02-25
CS168869B1 (fr)	1976-06-29
CS168166B1 (fr)	1976-05-28
CS155400B1 (fr)	1974-05-30
CS161020B1 (fr)	1975-05-04
JPS495561A (fr)	1974-01-18
CS165514B1 (fr)	1975-12-22