GB2209646B - A speech circuit for a telephone - Google Patents

A speech circuit for a telephone

Info

Publication number
GB2209646B
GB2209646B GB8721477A GB8721477A GB2209646B GB 2209646 B GB2209646 B GB 2209646B GB 8721477 A GB8721477 A GB 8721477A GB 8721477 A GB8721477 A GB 8721477A GB 2209646 B GB2209646 B GB 2209646B
Authority
GB
United Kingdom
Prior art keywords
telephone
speech circuit
speech
circuit
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 - Fee Related
Application number
GB8721477A
Other versions
GB8721477D0 (en
GB2209646A (en
Inventor
Lorcan John O'neill
Brian Vincent Keogh
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.)
Lake Electronic Technologies Ltd
Original Assignee
Lake Electronic Technologies 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 Lake Electronic Technologies Ltd filed Critical Lake Electronic Technologies Ltd
Publication of GB8721477D0 publication Critical patent/GB8721477D0/en
Publication of GB2209646A publication Critical patent/GB2209646A/en
Application granted granted Critical
Publication of GB2209646B publication Critical patent/GB2209646B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H03G3/301—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable
    • 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)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
GB8721477A 1987-09-07 1987-09-11 A speech circuit for a telephone Expired - Fee Related GB2209646B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IE872384A IE872384L (en) 1987-09-07 1987-09-07 Speech circuit for telephone

Publications (3)

Publication Number Publication Date
GB8721477D0 GB8721477D0 (en) 1987-10-21
GB2209646A GB2209646A (en) 1989-05-17
GB2209646B true GB2209646B (en) 1991-06-12

Family

ID=11034497

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8721477A Expired - Fee Related GB2209646B (en) 1987-09-07 1987-09-11 A speech circuit for a telephone

Country Status (7)

Country Link
CN (1) CN1032092A (en)
AU (1) AU2191088A (en)
GB (1) GB2209646B (en)
IE (1) IE872384L (en)
NL (1) NL8702310A (en)
SE (1) SE8704927L (en)
ZA (1) ZA876822B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU622524B2 (en) * 1989-03-16 1992-04-09 Alcatel Australia Limited Receiver mute circuit

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1115142A (en) * 1965-11-10 1968-05-29 Telefunken Patent Improvements in or relating to ele ctrically adjustable voltage dividers
GB1207339A (en) * 1967-12-07 1970-09-30 Standard Telephones Cables Ltd Loud speaking telephone circuits
US3533006A (en) * 1968-11-04 1970-10-06 Collins Radio Co Infinite range electronics gain control circuit
GB1257837A (en) * 1968-03-26 1971-12-22
GB1446724A (en) * 1972-08-30 1976-08-18 Hitachi Ltd Automatic gain control circuits
GB2117200A (en) * 1982-03-01 1983-10-05 Philips Nv Amplifier circuit with automatic gain control

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1115142A (en) * 1965-11-10 1968-05-29 Telefunken Patent Improvements in or relating to ele ctrically adjustable voltage dividers
GB1207339A (en) * 1967-12-07 1970-09-30 Standard Telephones Cables Ltd Loud speaking telephone circuits
GB1257837A (en) * 1968-03-26 1971-12-22
US3533006A (en) * 1968-11-04 1970-10-06 Collins Radio Co Infinite range electronics gain control circuit
GB1446724A (en) * 1972-08-30 1976-08-18 Hitachi Ltd Automatic gain control circuits
GB2117200A (en) * 1982-03-01 1983-10-05 Philips Nv Amplifier circuit with automatic gain control

Also Published As

Publication number Publication date
GB8721477D0 (en) 1987-10-21
NL8702310A (en) 1989-04-03
CN1032092A (en) 1989-03-29
ZA876822B (en) 1988-05-25
GB2209646A (en) 1989-05-17
SE8704927L (en) 1989-03-08
AU2191088A (en) 1989-03-09
SE8704927D0 (en) 1987-12-10
IE872384L (en) 1989-03-07

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19920911