DE828710C - Fernsprechschaltung mit Lautsprechern - Google Patents

Fernsprechschaltung mit Lautsprechern

Info

Publication number
DE828710C
DE828710C DEP26631D DEP0026631D DE828710C DE 828710 C DE828710 C DE 828710C DE P26631 D DEP26631 D DE P26631D DE P0026631 D DEP0026631 D DE P0026631D DE 828710 C DE828710 C DE 828710C
Authority
DE
Germany
Prior art keywords
loudspeakers
line
loudspeaker
relay
microphones
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
DEP26631D
Other languages
German (de)
English (en)
Inventor
Kennerth E Latimer
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Application granted granted Critical
Publication of DE828710C publication Critical patent/DE828710C/de
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
    • H04R3/08—Circuits for transducers, loudspeakers or microphones for correcting frequency response of electromagnetic transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • H04M9/087—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using different frequency bands for transmitting and receiving paths ; using phase shifting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Acoustics & Sound (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
DEP26631D 1945-03-29 1948-12-24 Fernsprechschaltung mit Lautsprechern Expired DE828710C (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2606252X 1945-03-29
GB8031/45A GB597170A (en) 1945-03-29 1947-08-08 Improvements in loud-speaking telephone arrangements

Publications (1)

Publication Number Publication Date
DE828710C true DE828710C (de) 1952-01-21

Family

ID=32232360

Family Applications (1)

Application Number Title Priority Date Filing Date
DEP26631D Expired DE828710C (de) 1945-03-29 1948-12-24 Fernsprechschaltung mit Lautsprechern

Country Status (6)

Country Link
US (1) US2606252A (forum.php)
BE (1) BE478694A (forum.php)
CH (1) CH266245A (forum.php)
DE (1) DE828710C (forum.php)
FR (1) FR1015515A (forum.php)
GB (1) GB597170A (forum.php)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB597170A (en) * 1945-03-29 1948-01-20 Philips Nv Improvements in loud-speaking telephone arrangements

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2205142A (en) * 1937-02-03 1940-06-18 Holtzer Cabot Electric Co Loudspeaking telephone system
GB508031A (en) * 1937-12-23 1939-06-23 Automatic Telephone & Elect Improvements in or relating to telephone systems
US2199220A (en) * 1939-07-18 1940-04-30 French Hubert Interstation communication system
US2264311A (en) * 1939-08-14 1941-12-02 Associated Electric Lab Inc Transmission system
NL66226C (forum.php) * 1942-03-12
GB597170A (en) * 1945-03-29 1948-01-20 Philips Nv Improvements in loud-speaking telephone arrangements

Also Published As

Publication number Publication date
CH266245A (de) 1950-01-15
US2606252A (en) 1952-08-05
FR1015515A (fr) 1952-10-28
GB597170A (en) 1948-01-20
BE478694A (forum.php) 1948-06-24

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