GB628033A - Improvements in or relating to loud-speaking telephone equipment - Google Patents

Improvements in or relating to loud-speaking telephone equipment

Info

Publication number
GB628033A
GB628033A GB1291749A GB1291749A GB628033A GB 628033 A GB628033 A GB 628033A GB 1291749 A GB1291749 A GB 1291749A GB 1291749 A GB1291749 A GB 1291749A GB 628033 A GB628033 A GB 628033A
Authority
GB
United Kingdom
Prior art keywords
loud
relating
telephone equipment
speaking telephone
speaking
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
GB1291749A
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.)
Automatic Telephone and Electric Co Ltd
Original Assignee
Automatic Telephone and Electric 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.)
Filing date
Publication date
Application filed by Automatic Telephone and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
Publication of GB628033A publication Critical patent/GB628033A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)

Abstract

628,033. Loudspeaker systems. AUTOMATIC TELEPHONE .& ELECTRIC CO., Ltd., ROSEBY, P. N., and RICKABY, A. Jan. 23, 1947, No. 12917/49. Divided out of 628,008. Drawings to Specification. [Class 40 (iv)] A loud-speaking telephone equipment is the same as that described in Specification 628,008, the claims being directed to the use of a thermistor across the output to the loudspeaker for the reduction of the tendency to howl.
GB1291749A 1947-01-23 1947-01-23 Improvements in or relating to loud-speaking telephone equipment Expired GB628033A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB207147A GB628008A (en) 1947-01-23 1947-01-23 Improvements in or relating to loud-speaking telephone equipment

Publications (1)

Publication Number Publication Date
GB628033A true GB628033A (en) 1949-08-19

Family

ID=9733067

Family Applications (2)

Application Number Title Priority Date Filing Date
GB207147A Expired GB628008A (en) 1947-01-23 1947-01-23 Improvements in or relating to loud-speaking telephone equipment
GB1291749A Expired GB628033A (en) 1947-01-23 1947-01-23 Improvements in or relating to loud-speaking telephone equipment

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB207147A Expired GB628008A (en) 1947-01-23 1947-01-23 Improvements in or relating to loud-speaking telephone equipment

Country Status (1)

Country Link
GB (2) GB628008A (en)

Also Published As

Publication number Publication date
GB628008A (en) 1949-08-19

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