GB2271030A - Electronic volume control system - Google Patents

Electronic volume control system Download PDF

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Publication number
GB2271030A
GB2271030A GB9220522A GB9220522A GB2271030A GB 2271030 A GB2271030 A GB 2271030A GB 9220522 A GB9220522 A GB 9220522A GB 9220522 A GB9220522 A GB 9220522A GB 2271030 A GB2271030 A GB 2271030A
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GB
United Kingdom
Prior art keywords
volume
control system
level
volume control
electronic
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.)
Granted
Application number
GB9220522A
Other versions
GB9220522D0 (en
GB2271030B (en
Inventor
Issam Moh D Ahmed Wadi
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB9220522A priority Critical patent/GB2271030B/en
Publication of GB9220522D0 publication Critical patent/GB9220522D0/en
Publication of GB2271030A publication Critical patent/GB2271030A/en
Application granted granted Critical
Publication of GB2271030B publication Critical patent/GB2271030B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • 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

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

An electronic automatic volume control system for a radio or TV receiver wherein the volume level is controlled to a selected level in spite of variations in signal level introduced by external sources such as channel/station changes or interference. The time constant of response of the volume control system may be adjusted. A volume limiter avoids raising the volume above certain levels. The system may be integrated with the receiver circuitry and may use digital, analog or microprocessor based systems. <IMAGE>

Description

PANEL A AUTO - VOLUME CONTROL SYSTEM TECHNICAL FIELD: THIS INVENTION PERTAINS TO AUDIO VOLUME CONTROL, IN ANY DEVICE USING AUDIO CIRCUITS DRIVEN BY EXTERNAL SOURCES SUCH AS TV AND RADIO SETS.
BACKGROUND: THE PREVAILING VOLUME CONTROL CIRCUITS USED IN ALL RADIO AND TV SETS ARE BASED ON OPEN LOOP CONTROL DESIGNS. HENCE ANY CHANGE IN SOUND VOLUME CAUSED BY EXTERNAL FACTORS SUCH AS TRANSMISSION SYSTEMS INTERFERENCE OR DISTORTION PROBLEMS PLUS CHANGES IN VOLUME CAUSED BY FREQUENT CHANGES OF STATIONS/CHANNELS IS A SOURCE OF NOISE AND ANNOYANCE TO OBSERVERS AND AUDIENCE DUE TO SUDDEN AND UNCONTROLLED CHANGE IN LEVEL OF SOUND (DECIBEL LEVEL) NEAR THE TV SET.
TECHNICAL FEATURES: ACCORDING TO THIS INVENTION, THE NEW VOLUME CONTROL SYSTEM WILL USE FEEDBACK CONTROL TECHNIQUES TO ADJUST VOLUME LEVEL AND CONSEQUENTLY DECIBEL LEVEL OF THE SET SOUND . THIS TECHNIQUE WILL RESULT IN STEADY AND CONSTANT SOUND LEVEL OF THE SET WITHOUT MANUAL INTERVENTION FROM THE AUDIENCE , EVEN IN THE CASE OF CHANNELS CHANGING. THIS FEATURE WILL AVOID ANNOYANCE CAUSED BY SUDDEN INCREASE OR DECREASE OF TV SET VOLUME CAUSED BY CHANGES IN STATIONS/CHANNELS OR BY OTHER EXTERNAL FACTORS SUCH AS INTERFERENCE.
PANEL B AUTO VOLUME CONTROL SYSTEM REFERENCE THE CIRCUIT ATTACHED IN FIGURE (1) THE ACTUAL VOLUME LEVEL SIGNAL GOING TO THE AUDIO AMPLIFIER WHICH DRIVES THE LOUD SPEAKERS IN THE RADIO OR TV SET, IS MONITORED BY A NEW CIRCUIT CALLED AUTO VOLUME CONTROL CIRCUIT WHICH COMPARES THE ACTUAL VOLUME SIGNAL LEVEL TO THE SETPOINT OF VOLUME AS SET BY THE AUDIENCE FROM A VOLUME KNOB WHICH SETS A DECIBEL LEVEL PERCENTAGE.
HAVING THE 100% EQUAL TO THE HIGHEST DECIBEL LEVEL GOING OUT OF THE SET AT ANY CHANNEL AND VOLUME LEVEL SELECTED. THE SETPOINT RANGE OF THIS CIRCUIT SHOULD MATCH THE RANGE OF THE MEASURED SIGNAL GOING TO THE AUDIO AMPLIFIER. UPON COMPARING THESE TWO SIGNALS THE AUTO VOLUME CONTROL CIRCUIT WILL SEND A CONTROL SIGNAL PROPORTIONAL TO THE ERROR SIGNAL (DIFFERENCE BETWEEN THE ACTUAL AUDIO SIGNAL LEVEL AND THE DESIRED ONE) TO THE AUDIO AMPLIFIER ADJUSTING ITS OUTPUT ACCORDING TO THE DESIRED LEVEL WANTED. THE CONTROL CIRCUIT WILL HAVE BESIDE GAIN CONTROL AN INTEGRAL ACTION ON THE ERROR SIGNAL TO CONTROL TIME CONSTANT OF RESPONSE.
ABOVE CIRCUIT CAN BE IMPLEMENTED USING VARIOUS ELECTRONIC COMPONENTS SUCH AS DIGITAL, ANALOG OR MICROPROCESSOR BASED SYSTEMS DEPENDING ON MANUFACTURERS' TECHNOLOGY USED IN THE SET. IT CAN BE USED WITH ANY TV OR RADIO SET AVAILABLE TODAY IN THE MARKET. THE BEST APPROACH TO ITS IMPLEMENTATION IS BY THE TV AND RADIO SETS MANUFACTURERS BY INTEGRATING IT WITHIN THE SET CIRCUITRY USING THE SAME COMPONENT TECHNOLOGY USED IN THE SET.

Claims (1)

  1. PANEL C
    AUTO VOLUME CONTROL SYSTEM CLAIMS:
    1- AN ELECTRONIC VOLUME CONTROL SYSTEM USING NORMAL ELECTRONIC COMPONENTS TO MONITOR AND CONTROL TV SETS AND RADIO SETS VOLUME LEVELS AND CONTROL IT AUTOMATICALLY TO CERTAIN SELECTED LEVELS AS EXPLAINED IN FIGURE (1) IN SPITE OF VARIATIONS IN AUDIO SIGNAL LEVEL INTRODUCED BY EXTERNAL SOURCES SUCH AS CHANNEL / STATIONS CHANGES OR INTERFERENCE.
    2- AN ELECTRONIC VOLUME CONTROL SYSTEM AS CLAIMED IN -1- ABOVE WHERE THE TV AND/OR RADIO SET ACTUAL VOLUME LEVEL IS MONITORED CONTINUOUSLY AND COMPARED TO A SETPOlNT (DESIRED VOLUME LEVEL) CONTINUOUSLY AND ACCORDINGLY CONTROLLING THE OUTPUT TO THE AUDIO AMPLIFIER WHICH CONSEQUENTLY MAINTAINS THE SOUND DECIBEL LEVEL AT CERTAIN DESIRED LEVELS.
    3- AN ELECTRONIC VOLUME CONTROL SYSTEM AS CLAIMED IN CLAIMS -1- AND -2- ABOVE CAN BE USED IN ANY ELECTRONIC DEVICE WHICH HAS AN AUDIO CIRCUIT DRIVING LOUD SPEAKERS AND WHERE THE AUDIO SIGNAL LEVEL IS INFLUENCED BY EXTERNAL SOURCES.
    4- AN ELECTRONIC VOLUME CONTROL SYSTEM WHICH HAS NECESSARY TUNING COMPONENTS TO ADJUST TIME CONSTANT OF AUDIO LEVEL CHANGE CURVE.
    5- AN ELECTRONIC VOLUME CONTROL SYSTEM WHICH HAS VOLUME LIMITERS FOR THE VOLUME LEVELS SET MANUALLY TO AVOID RAISING THE VOLUME ABOVE CERTAIN LEVELS UNDER ANY CIRCUMSTANCES.
GB9220522A 1992-09-29 1992-09-29 Auto - volume control system Expired - Fee Related GB2271030B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9220522A GB2271030B (en) 1992-09-29 1992-09-29 Auto - volume control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9220522A GB2271030B (en) 1992-09-29 1992-09-29 Auto - volume control system

Publications (3)

Publication Number Publication Date
GB9220522D0 GB9220522D0 (en) 1992-11-11
GB2271030A true GB2271030A (en) 1994-03-30
GB2271030B GB2271030B (en) 1996-11-20

Family

ID=10722683

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9220522A Expired - Fee Related GB2271030B (en) 1992-09-29 1992-09-29 Auto - volume control system

Country Status (1)

Country Link
GB (1) GB2271030B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130114828A1 (en) * 2006-03-24 2013-05-09 Panasonic Automotive Systems Company Of America, Division Of Panasonic Corpor Audio system with parental maximum volume control

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1330988A (en) * 1971-07-29 1973-09-19 Tull Aviation Corp Receiver for pulse modulated signals
GB2004428A (en) * 1977-09-16 1979-03-28 Plessey Co Ltd Receiver circuit arrangement with automatic gain control
GB2019681A (en) * 1978-03-01 1979-10-31 Saint Gobain Radio receiving antenna and control circuit
WO1987006072A1 (en) * 1986-04-03 1987-10-08 Motorola, Inc. Fm receiver with noise suppression during rayleigh faded received signals
GB2204200A (en) * 1986-12-23 1988-11-02 Motorola Inc Receiver with automatic gain control

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB433837A (en) * 1933-11-22 1935-08-21 Marconi Wireless Telegraph Co Improvements in or relating to thermionic valve amplifiers
GB691860A (en) * 1950-01-28 1953-05-20 Emi Ltd Improvements relating to automatic gain control arrangements for radio and like receivers
DE3115683C2 (en) * 1981-04-18 1983-07-28 Deutsche Thomson-Brandt Gmbh, 7730 Villingen-Schwenningen Circuit arrangement for delayed, automatic gain control
FR2520952A1 (en) * 1982-02-03 1983-08-05 Trt Telecom Radio Electr AUTOMATIC GAIN CONTROL DEVICE (AGC) WITH QUICK ACTION

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1330988A (en) * 1971-07-29 1973-09-19 Tull Aviation Corp Receiver for pulse modulated signals
GB2004428A (en) * 1977-09-16 1979-03-28 Plessey Co Ltd Receiver circuit arrangement with automatic gain control
GB2019681A (en) * 1978-03-01 1979-10-31 Saint Gobain Radio receiving antenna and control circuit
WO1987006072A1 (en) * 1986-04-03 1987-10-08 Motorola, Inc. Fm receiver with noise suppression during rayleigh faded received signals
GB2204200A (en) * 1986-12-23 1988-11-02 Motorola Inc Receiver with automatic gain control

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130114828A1 (en) * 2006-03-24 2013-05-09 Panasonic Automotive Systems Company Of America, Division Of Panasonic Corpor Audio system with parental maximum volume control
US9537459B2 (en) * 2006-03-24 2017-01-03 Panasonic Automotive Systems Company Of America, Division Of Panasonic Corporation Of North America Audio system with parental maximum volume control

Also Published As

Publication number Publication date
GB9220522D0 (en) 1992-11-11
GB2271030B (en) 1996-11-20

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Legal Events

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

Effective date: 20000929