FR761604A - Enhancements to dual-channel telephone systems and the like - Google Patents

Enhancements to dual-channel telephone systems and the like

Info

Publication number: FR761604A
Authority: FR; France
Prior art keywords: enhancements; dual; telephone systems; channel telephone; channel
Prior art date: 1932-09-03
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

Other languages

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.)

Marconis Wireless Telegraph Co Ltd

BAE Systems Electronics Ltd

Original Assignee

Marconis Wireless Telegraph Co Ltd

Marconi 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.)

1932-09-03

Filing date

1933-09-02

Publication date

1934-03-23

1933-09-02 Application filed by Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd

1934-03-23 Application granted granted Critical

1934-03-23 Publication of FR761604A publication Critical patent/FR761604A/en

Status Expired legal-status Critical Current

Classifications

- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other

Landscapes

Engineering & Computer Science (AREA)
Computer Networks & Wireless Communication (AREA)
Signal Processing (AREA)
Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Noise Elimination (AREA)
Interface Circuits In Exchanges (AREA)
Near-Field Transmission Systems (AREA)

FR761604D 1932-09-03 1933-09-02 Enhancements to dual-channel telephone systems and the like Expired FR761604A (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
GB24631/32A GB408300A (en)	1932-09-03	1932-09-03	Improvements in or relating to two-way telephone and like electrical systems

Publications (1)

Publication Number	Publication Date
FR761604A true FR761604A (en)	1934-03-23

Family

ID=10214744

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
FR761604D Expired FR761604A (en)	1932-09-03	1933-09-02	Enhancements to dual-channel telephone systems and the like

Country Status (5)

Country	Link
US (1)	US1992833A (en)
DE (1)	DE623827C (en)
FR (1)	FR761604A (en)
GB (2)	GB408300A (en)
NL (1)	NL37480C (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US2511948A (en) *		1950-06-20		Hybrid circuit
NL80719C (en) *	1949-10-11
DE1062748B (en) *	1956-02-29	1959-08-06	Siemens Ag	Device to avoid undesired feedback in transmission systems

0
- DE DENDAT623827D patent/DE623827C/de active Active
- NL NL37480D patent/NL37480C/xx active
1932
- 1932-09-03 GB GB24631/32A patent/GB408300A/en not_active Expired
- 1932-09-03 GB GB6796/34A patent/GB408329A/en not_active Expired
1933
- 1933-09-02 FR FR761604D patent/FR761604A/en not_active Expired
- 1933-09-21 US US690320A patent/US1992833A/en not_active Expired - Lifetime

Also Published As

Publication number	Publication date
DE623827C (en)
NL37480C (en)
GB408329A (en)	1934-04-03
GB408300A (en)	1934-04-03
US1992833A (en)	1935-02-26

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