GB2271030A - Electronic volume control system - Google Patents
Electronic volume control system Download PDFInfo
- 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
- Authority
- 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
Links
- 230000005236 sound signal Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
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
Landscapes
- 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)
- PANEL CAUTO 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.
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)
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)
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)
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 |
-
1992
- 1992-09-29 GB GB9220522A patent/GB2271030B/en not_active Expired - Fee Related
Patent Citations (5)
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)
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 |
---|---|
GB2271030B (en) | 1996-11-20 |
GB9220522D0 (en) | 1992-11-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5081682A (en) | On-vehicle automatic loudness control apparatus | |
KR100744847B1 (en) | Input apparatus, reproducing apparatus and volume adjusting method | |
EP0817374A2 (en) | Audio system | |
US4811423A (en) | SSB receiver with improved feedforward AGC | |
US5175508A (en) | Voltage-controlled amplifier using operational amplifier | |
KR100405972B1 (en) | Automatic volume controller | |
US6208848B1 (en) | Radio receiver squelch circuit with automatic adjustment of the squelch threshold | |
GB2271030A (en) | Electronic volume control system | |
US5724006A (en) | Circuit arrangement with controllable transmission characteristics | |
FI62610C (en) | ADJUSTMENT OF FAIRGSIGNALFOERSTAERKARE | |
US5121076A (en) | Plural time constant signal control | |
US20020057804A1 (en) | Circuit and method for automatically limiting the amplitude of broadcast audio signals | |
GB2123231A (en) | Gain control of audio-amplifying systems | |
JP2003169270A (en) | Video apparatus with voice decoder | |
KR100623630B1 (en) | Apparatus and method for providing television receiver alignment functions | |
JPH0732340B2 (en) | AGC circuit | |
JPH0637563A (en) | Automatic sound volume adjusting device | |
JP2921375B2 (en) | Audio limiter device | |
JP3247526B2 (en) | Audio signal level adjustment device | |
US5388161A (en) | Tone adjusting apparatus for audio signals | |
US5424679A (en) | +12dB gain linear-fader control for VCA | |
CA1310713C (en) | Signal feedback amplifier for a cable-tv converter | |
JPS6046133A (en) | Radio receiver | |
JPH02162911A (en) | Amplifier for catv | |
EP0621687B1 (en) | Audio amplifier arrangement |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20000929 |