GB1461145A - Multichannel control circuit wich dc operated control devices - Google Patents

Multichannel control circuit wich dc operated control devices

Info

Publication number
GB1461145A
GB1461145A GB1957274A GB1957274A GB1461145A GB 1461145 A GB1461145 A GB 1461145A GB 1957274 A GB1957274 A GB 1957274A GB 1957274 A GB1957274 A GB 1957274A GB 1461145 A GB1461145 A GB 1461145A
Authority
GB
United Kingdom
Prior art keywords
signal
control
transistor
differential amplifier
current
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
GB1957274A
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.)
Motorola Solutions Inc
Original Assignee
Motorola Inc
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 Motorola Inc filed Critical Motorola Inc
Publication of GB1461145A publication Critical patent/GB1461145A/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
    • H03G5/02—Manually-operated control
    • H03G5/04—Manually-operated control in untuned amplifiers
    • H03G5/10—Manually-operated control in untuned amplifiers having semiconductor devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/02—Manually-operated control
    • H03G3/04—Manually-operated control in untuned amplifiers
    • H03G3/10—Manually-operated control in untuned amplifiers having semiconductor devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
    • H04S7/30—Control circuits for electronic adaptation of the sound field
    • H04S7/307—Frequency adjustment, e.g. tone control

Landscapes

  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Stereophonic System (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

1461145 Volume and tone control MOTOROLA Inc 3 May 1974 [19 June 1973] 19572/74 Headings H4R, H4J In an arrangement for control in a multichannel amplifier by a single variable d.c voltage the signal input is applied to a current steering device controlled by the variable d.c voltage to provide selectively a feed forward for boosting an input signal or feed back for attenuating the signal as described with respect to Fig. 3 an input signal is applied to one input of a differential amplifier 30 with one output from transistor 30b, being taken to an output circuit 80 and a second output, from transistor 30a, being taken via transistor 41 and contact pad 16 to provide a high pass filtered signal for application to contact pad 13 and a low pass filtered signal to contact pad 1. The high pass filtered signal is applied to transistor 52c to control the total current flow through the differential amplifier 52, in wihch the division of current between transistors 52a and 52b is controlled by the d.c potential applied to the base of transistor 52a from the treble control 22. The two outputs from the differential amplifier 52 are taken respcctively as negative feedback to the base of transistor 30b, and as an aiding signal to the output circuit 80 so that adjustment of the current division between transistors 52a and 52b provides either treble cut, when the current flows through 52a or treble boost when the current flows through 52b, and a variation from cut to boost as the division is varied. Differential amplifier 54 is connected in parallel with the differential amplifier 52 but has no signal applied thereto and is cross connected for d.c so that d.c conditions do not vary at the outputs. In a similar way the differential amplifier 62 is connected to feed low pass filtered signals either to the output circuit 80 or back to the amplifier 30, so as to provide bass boost or cut under the control of base control 24. Volume and balance control Fig. 4 is effected by feeding each channel signal through cascaded differential amplifiers 102, 112 or 122, 132, each provided with d.c. balancing amplifiers 104, 114, 124, 134, in which the current division in the first amplifiers in the chain, i.e. 102, 122, is varied so as to differentially affect the signal gain on adjustment of balance control 28, while the current division in the second amplifiers, i.e. 112, 134, is such as to simultaneously vary the signal gain on adjustment of the volume control 26.
GB1957274A 1973-06-19 1974-05-03 Multichannel control circuit wich dc operated control devices Expired GB1461145A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US371437A US3875334A (en) 1973-06-19 1973-06-19 Multi-channel control circuit with D-C operated control devices

Publications (1)

Publication Number Publication Date
GB1461145A true GB1461145A (en) 1977-01-13

Family

ID=23463996

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1957274A Expired GB1461145A (en) 1973-06-19 1974-05-03 Multichannel control circuit wich dc operated control devices

Country Status (7)

Country Link
US (1) US3875334A (en)
JP (1) JPS5840367B2 (en)
CA (1) CA998619A (en)
DE (1) DE2429242A1 (en)
GB (1) GB1461145A (en)
HK (1) HK73779A (en)
IT (1) IT1013490B (en)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3937885A (en) * 1974-09-06 1976-02-10 Motorola, Inc. Control circuit for a matrixed four channel audio reproducing system
JPS5234649U (en) * 1975-09-03 1977-03-11
JPS5265644A (en) * 1975-11-26 1977-05-31 Matsushita Electric Ind Co Ltd Volume control circuit
US4045748A (en) * 1975-12-19 1977-08-30 The Magnavox Company Audio control system
JPS5313860A (en) * 1976-07-23 1978-02-07 Pioneer Electronic Corp Tone control device
US4113984A (en) * 1976-09-17 1978-09-12 General Motors Corporation Voltage translating circuit for volume and balance control of a four-channel audio system
US4076959A (en) * 1976-10-08 1978-02-28 General Motors Corporation Volume, tone and balance control for multi-channel audio systems
JPS5383553A (en) * 1976-12-29 1978-07-24 Matsushita Electric Ind Co Ltd Aural circuit
US4070633A (en) * 1977-03-10 1978-01-24 Motorola Inc. Remote controlled amplifier
JPS5760714A (en) * 1980-09-29 1982-04-12 Toshiba Corp Adjusting device for frequency characteristic
US4404527A (en) * 1980-11-03 1983-09-13 General Motors Corporation Bridge audio amplifier including low level fade control
FR2501935B1 (en) * 1981-03-13 1985-09-13 Thomson Csf VOLUME AND TONE CONTROL CIRCUIT INCORPORATING PHYSIOLOGICAL CORRECTION WITHOUT ADDITIONAL FILTER
US4466118A (en) * 1983-02-01 1984-08-14 Motorola, Inc. Dual range audio level control
JPS6022265U (en) * 1983-07-25 1985-02-15 株式会社　ジエ−アンドエム driver
DE3627056A1 (en) * 1986-08-09 1988-02-18 Thomson Brandt Gmbh Circuit for dynamic compression or expansion in a useful-signal path
CH686753A5 (en) * 1993-07-19 1996-06-14 Yair Dr Schiftan Electronic device for generating acoustic raeuumlichen effects.
IL150176A (en) * 1999-12-22 2005-07-25 2 & 2 & 2 Ag Method and arrangement for recording and playing back sounds
JP2002142300A (en) * 2000-11-06 2002-05-17 Pioneer Electronic Corp Sound field forming circuit and sound field forming system
US8411877B2 (en) * 2009-10-13 2013-04-02 Conexant Systems, Inc. Tuning and DAC selection of high-pass filters for audio codecs
JP5327481B2 (en) * 2011-01-13 2013-10-30 オンキヨー株式会社 Tone control device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3466572A (en) * 1965-10-14 1969-09-09 Automatic Elect Lab Apparatus for regulating signals in response to their total root mean square value
US3631365A (en) * 1968-11-01 1971-12-28 Dolby Laboratories Inc Signal compressors and expanders
US3725583A (en) * 1970-07-20 1973-04-03 Motorola Inc Volume and tone control for multi-channel audio systems
US3752928A (en) * 1971-03-04 1973-08-14 D Flickinger Amplifier system utilizing regenerative and degenerative feedback to shape the frequency response
DE2262089C3 (en) * 1972-12-19 1975-10-30 Philips Patentverwaltung Gmbh, 2000 Hamburg Circuit arrangement for electronic frequency influencing, in particular electronic sound adjuster

Also Published As

Publication number Publication date
DE2429242A1 (en) 1975-01-16
HK73779A (en) 1979-10-26
JPS5840367B2 (en) 1983-09-05
CA998619A (en) 1976-10-19
JPS5037401A (en) 1975-04-08
US3875334A (en) 1975-04-01
IT1013490B (en) 1977-03-30

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee