GB1115015A - Improvements in or relating to automatic bandwidth adjustment of an audio frequency signal - Google Patents

Improvements in or relating to automatic bandwidth adjustment of an audio frequency signal

Info

Publication number
GB1115015A
GB1115015A GB901266A GB901266A GB1115015A GB 1115015 A GB1115015 A GB 1115015A GB 901266 A GB901266 A GB 901266A GB 901266 A GB901266 A GB 901266A GB 1115015 A GB1115015 A GB 1115015A
Authority
GB
United Kingdom
Prior art keywords
transistor
collector
signal
capacitor
series
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
GB901266A
Inventor
Terence Alexander Mcmullin
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.)
Rank Organization Ltd
Original Assignee
Rank Organization 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 Rank Organization Ltd filed Critical Rank Organization Ltd
Priority to GB901266A priority Critical patent/GB1115015A/en
Publication of GB1115015A publication Critical patent/GB1115015A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/16—Automatic control
    • H03G5/18—Automatic control in untuned amplifiers
    • H03G5/22—Automatic control in untuned amplifiers having semiconductor devices

Landscapes

  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)

Abstract

1,115,015. Automatic control of frequency response. RANK ORGANISATION Ltd. 28 Feb., 1967, No. 9012/66. Headings H3T and H4R. A circuit for adjusting the bandwidth of an audio signal comprises a capacitance and also switch means comprising a transistor associated with a signal source, and means for operating the switch means either in accordance with the signal level or independence upon the signal to noise ratio. The high-frequency response of a source comprising amplifying transistor 5 is varied by means of capacitor 8 in series with the collector to emitter path of transistor 9, shunting the collector load 6 of transistor 5, the control voltage being applied to the base of transistor 9. As shown, the lowfrequency response is varied simultaneously by means of capacitor 3 in series with the collector to emitter path of transistor 4, shunting resistor 7 in the emitter circuit of transistor 5, the control voltage being also applied to the base of transistor 4. In a further embodiment (Fig. 4, not shown) the response at low frequencies is varied by means of a capacitor in series in the signal path, shunted by the collector to emitter path of a transistor acting as a switch.
GB901266A 1966-03-01 1966-03-01 Improvements in or relating to automatic bandwidth adjustment of an audio frequency signal Expired GB1115015A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB901266A GB1115015A (en) 1966-03-01 1966-03-01 Improvements in or relating to automatic bandwidth adjustment of an audio frequency signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB901266A GB1115015A (en) 1966-03-01 1966-03-01 Improvements in or relating to automatic bandwidth adjustment of an audio frequency signal

Publications (1)

Publication Number Publication Date
GB1115015A true GB1115015A (en) 1968-05-22

Family

ID=9863649

Family Applications (1)

Application Number Title Priority Date Filing Date
GB901266A Expired GB1115015A (en) 1966-03-01 1966-03-01 Improvements in or relating to automatic bandwidth adjustment of an audio frequency signal

Country Status (1)

Country Link
GB (1) GB1115015A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2437118A1 (en) * 1978-09-22 1980-04-18 Sony Corp CIRCUIT FOR PROCESSING RECORDING AND REPRODUCING SIGNALS
GB2238198A (en) * 1989-09-28 1991-05-22 Orbitel Mobile Communications Amplifier arrangement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2437118A1 (en) * 1978-09-22 1980-04-18 Sony Corp CIRCUIT FOR PROCESSING RECORDING AND REPRODUCING SIGNALS
GB2238198A (en) * 1989-09-28 1991-05-22 Orbitel Mobile Communications Amplifier arrangement

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