CN101494753B - Method and apparatus for adjusting sound volume - Google Patents
Method and apparatus for adjusting sound volume Download PDFInfo
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- CN101494753B CN101494753B CN200810065976A CN200810065976A CN101494753B CN 101494753 B CN101494753 B CN 101494753B CN 200810065976 A CN200810065976 A CN 200810065976A CN 200810065976 A CN200810065976 A CN 200810065976A CN 101494753 B CN101494753 B CN 101494753B
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Abstract
The present invention provides a sound volume adjusting device. The device includes an automatic level control amplifier, and an MCU, wherein, the MCU is used to invoke the stored ALC control value corresponding to the current channel, and to output the ALC control value corresponding to the current channel to the control voltage end of the automatic level control amplifier; the automatic level control amplifier is used to adjust its gain according to the ALC control value corresponding to the current channel, for controlling the magnification of the current channel voice signal.
Description
Technical field
The invention belongs to the volume controlling technique field, relate in particular to the technology that the volume when television set or STB changed platform controls automatically.
Background technology
Television set, STB and stereo set etc. get in each start back when normally watching state, and the user generally can do once adjustment to the sound size according to the actual needs of this moment, makes volume suitable, just no longer adjustment usually afterwards, and a switching channels is browsed program.
Because the audio signal modulation degree in different radio station is different; Sound size to making different radio station has very big-difference; Usually occur that sound becomes very big suddenly when switch to a certain channel, particularly be easy to influence others at dead of night the time, the beholder has in a hurry, volume reduced; And when switching to another channel again, sound may become very little suddenly again, even can not hear clearly, and the beholder has to again volume is heightened, and this kind phenomenon has been brought very big inconvenience to the user.
To the problems referred to above, existing solution generally adopts automatic electric-level control (ALC) circuit (also have and be called " intelligence " volume AVC circuit), and sort circuit is widely used inside being integrated in sound accompaniment IC at present.It mainly is to detect audio signal level at that time through an audio signal level detector; Go control " voltage-controlled amplifier " with detected audio signal level through a charge-discharge circuit again with set time constant; Gain with resonance-amplifier; Amplifier gain is changed with the size of audio signal: then amplifier gain is little by force for audio signal, otherwise then gain is big, and the output sound level is remained unchanged basically.
Waveform sketch map for ALC control voltage and audio signal shown in Figure 1, Fig. 2 is a background noise changes in amplitude sketch map.Because sound accompaniment amplitude generally speaking is relatively less, and the duration is longer relatively, because of the discharge time constant of the charge-discharge circuit of control " voltage-controlled amplifier " is not long enough relatively; So; Along with the prolongation of time, control voltage will progressively descend because of discharge (dotted line trailing edge part among Fig. 1), and the ALC Amplifier Gain then can rise gradually; Noise in the circuit will increase thereupon; The background noise changes in amplitude of representing like Fig. 2 is when gain rises to a certain degree, just can obviously hear bigger background noise; On the other hand; When the content that occurs in the audio signal by a relatively large margin; Because of general alc circuit charge constant all very little (usually at Millisecond), the control voltage of amplifier gain can rise (like the rising edge part of dotted line among Fig. 1) rapidly, and amplifier gain then descends fast; Background noise reduces (background noise shown in the broken circle suddenly from large to small among Fig. 2) suddenly, so form " aspirant effect ".
Therefore, though existing alc circuit can address the above problem because ALC control time constant (during discharge) is less relatively; It is easy to generate " aspirant effect "; Promptly during not having audio signal, background noise can be surging gradually, and in case audio signal occurs; Yet it ends with regard to loud, high-pitched sound, sounds very uncomfortable.
Summary of the invention
The object of the present invention is to provide a kind of method and device of volume adjustment, be intended to solve the problem of " the aspirant effect " that exist when alc circuit is controlled volume in the prior art.
The present invention is achieved in that a kind of volume adjusting device, and described device comprises automatic level control amplifier and MCU, wherein:
Described MCU is used for calling the corresponding ALC controlling value of current channel of being stored; Export the corresponding ALC controlling value of current television channel to the control voltage end of said automatic level control amplifier, wherein, said MCU detects the audio signal crest voltage of several time periods of each channel; The value of averaging computing; The data that draw as the corresponding ALC controlling value of these channels and be saved in the memory, and are continued to carry out peak value and detect and mean value calculation, bring in constant renewal in the ALC controlling value;
Said automatic level control amplifier is used for adjusting its gain according to the corresponding ALC controlling value of described current television channel, and control is to the amplification of said current television channel audio signal.
Described MCU also is used for detecting the audio signal peak value of the corresponding automatic level control amplifier output of each television channel, and is used for confirming to store after the corresponding ALC controlling value of each television channel according to the audio signal peak value that is detected.
Described ALC controlling value is two or more the mean value of audio signal peak value of each television channel of detecting of said MCU in the certain hour section.
Described MCU also is used for storing the channel identication of the television channel corresponding with the ALC controlling value of each channel.
The present invention also provides a kind of method of volume adjustment, and described method comprises the steps:
A, the ALC controlling value that MCU is corresponding with current television channel output to the control voltage end of automatic level control amplifier; Wherein, Said MCU detects the audio signal crest voltage of several time periods of each channel, the value of averaging computing, with the data that draw as the corresponding ALC controlling value of these channels and be saved in the memory; And continue to carry out peak value and detect and mean value calculation, bring in constant renewal in the ALC controlling value;
B, its gain of ALC controlling value adjustment that said automatic level control amplifier is corresponding according to described current television channel, control is to the amplification of said current television channel audio signal.
Wherein also comprise before the step a:
A0, MCU detect the audio signal peak value of the corresponding automatic level control amplifier output of each television channel, and are used for confirming to store after the corresponding ALC controlling value of each television channel according to the audio signal peak value that is detected.
Describedly confirm that according to the audio signal peak value that is detected the corresponding ALC controlling value of each television channel specifically comprises:
Detect two or more the audio signal peak value of each television channel in the certain hour section, ask the mean value of said two or more audio signal peak values.
When described MCU stores the ALC controlling value of said each channel correspondence, also store the corresponding channel identication of said ALC controlling value.
The present invention overcomes the deficiency of prior art; Employing is done to store as " ALC controlling value " after the mean value computing to detected peak signal, and is gained according to " ALC controlling value " control automatic level control amplifier of each channel by MCU by the audio signal amplitude that MCU detects each channel; Thereby realize technical scheme to the adjustment of volume; The technical scheme that this programme provides can solve television set and stereo set well when receiving different electric tv channel or different program, the problem that the sound size differs greatly, and " aspirant effect " in traditional solution can not appear; Offer the better experience of user, better met user's request.
Description of drawings
Fig. 1 is the waveform sketch map of prior art ALC control voltage and audio signal;
Fig. 2 is a prior art background noise changes in amplitude sketch map;
Fig. 3 is the theory diagram of the volume adjusting apparatus that provides of the embodiment of the invention;
Fig. 4 is an embodiment of the invention flow chart;
Embodiment
Technical scheme provided by the invention is: adopt MCU to detect the audio signal amplitude of each channel; Detected peak signal is done to store as " ALC controlling value " after the mean value computing; And by " ALC controlling value " control automatic level control amplifier gain of MCU, thereby realize control to volume according to each channel.
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Fig. 3 is the theory diagram of the volume adjusting apparatus that provides of the embodiment of the invention, comprises MCU (having memory) and automatic level control amplifier.
Wherein, MCU is connected in the output of automatic level control amplifier, is used to detect the audio signal amplitude, and detected peak signal is done the mean value computing, deposits operation result in memory, average data of being deposited and channel information Federal Reserve coupling.
Automatic level control amplifier (ALC); It is a gain controlled amplifier; Be used to amplify audio signal, its gain size depends on the height of control voltage on the ALC control end, and control voltage is exported to the ALC control end according to the average data of storing in the above-mentioned memory by MCU.
Its course of work is explained as follows:
1, confirms " ALC controlling value ".
Start gets into normal operating conditions, under arbitrary channel, through MCU the audio signal amplitude in the time period (such as 30 seconds) is detected, and obtains the different crest voltages of signal in the very first time section, and data are saved in the memory.Audio signal crest voltage by with several time periods of quadrat method continuous detecting then by the computing of the MCU value of averaging, draws the mean value of some time section crest voltage data, with " the ALC controlling value " of this mean value voltage as this channel.Because peak value detects and mean value calculation continues to carry out, promptly detect once at set intervals, calculate once, so " ALC controlling value " also brought in constant renewal in.
2, storage " ALC controlling value "
Put into memory by " the ALC controlling value " of average operator output and preserve, and with current channel information Federal Reserve coupling, " the ALC controlling value " of storing before substituting.
3, adjust the gain of automatic level control amplifier with " ALC controlling value ".
When returning this channel in start or by other channel; MCU directly calls corresponding " the ALC controlling value " of this channel of store memory storage; Deliver to the ALC control end of automatic level control amplifier; Gain to automatic level control amplifier is adjusted, and makes automatic level control amplifier obtain suitable gain.
During operate as normal, " ALC controlling value " will constantly export the ALC control end of automatic level control amplifier to, and the gain of automatic level control amplifier is adjusted, and make automatic level control amplifier obtain suitable gain.Embodiment of the invention flow chart is as shown in Figure 4, specifically comprises following step:
1, MCU detects the audio signal crest voltage of several time periods of each channel, and the value of averaging computing draws the mean value of these crest voltage data;
2, described crest voltage mean value is stored in the memory of MCU as " ALC controlling value ";
When 3, television set switched to a certain channel, MCU called the ALC control end that this channel corresponding " ALC controlling value " outputs to automatic level control amplifier from its memory;
4, automatic level control amplifier " ALC controlling value " ride gain corresponding according to this channel amplified audio signal.
The technical scheme that this programme provides can solve television set and stereo set well when receiving different electric tv channel or different program, the problem that the sound size differs greatly, and " aspirant effect " in traditional solution can not appear.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a volume adjusting device is characterized in that, described device comprises automatic level control amplifier and MCU, wherein:
Described MCU is used for calling the corresponding ALC controlling value of current channel of being stored; Export the corresponding ALC controlling value of current television channel to the control voltage end of said automatic level control amplifier, wherein, said MCU detects the audio signal crest voltage of several time periods of each channel; The value of averaging computing; The data that draw as the corresponding ALC controlling value of these channels and be saved in the memory, and are continued to carry out peak value and detect and mean value calculation, bring in constant renewal in the ALC controlling value;
Said automatic level control amplifier is used for adjusting its gain according to the corresponding ALC controlling value of described current television channel, and control is to the amplification of said current television channel audio signal.
2. device according to claim 1; It is characterized in that; Described MCU also is used for after receiver is searched platform, removing the ALC controlling value of being preserved; When normal reception radio station, detect the audio signal peak value of the corresponding automatic level control amplifier output of each television channel again, and be used for confirming to store after the corresponding ALC controlling value of each television channel according to the audio signal peak value that is detected.
3. device according to claim 2 is characterized in that, described ALC controlling value is two or more the mean value of audio signal peak value of each television channel of detecting of said MCU in the certain hour section.
4. device according to claim 2 is characterized in that, described MCU also is used for storing the channel identication of the television channel corresponding with the ALC controlling value of each channel.
5. the method for a volume adjustment is characterized in that described method comprises the steps:
A, the ALC controlling value that MCU is corresponding with current television channel output to the control voltage end of automatic level control amplifier; Wherein, Said MCU detects the audio signal crest voltage of several time periods of each channel, the value of averaging computing, with the data that draw as the corresponding ALC controlling value of these channels and be saved in the memory; And continue to carry out peak value and detect and mean value calculation, bring in constant renewal in the ALC controlling value;
B, its gain of ALC controlling value adjustment that said automatic level control amplifier is corresponding according to described current television channel, control is to the amplification of said current television channel audio signal.
6. method according to claim 5 is characterized in that, wherein also comprises before the step a:
A0, MCU detect the audio signal peak value of the corresponding automatic level control amplifier output of each television channel when normal the reception, and are used for confirming to store after the corresponding ALC controlling value of each television channel according to the audio signal peak value that is detected.
7. method according to claim 6 is characterized in that, describedly confirms that according to the audio signal peak value that is detected the corresponding ALC controlling value of each television channel specifically comprises:
Detect two or more the audio signal peak value of each television channel in the certain hour section, ask the mean value of said two or more audio signal peak values.
8. method according to claim 6 is characterized in that, when described MCU stores the ALC controlling value of said each channel correspondence, also stores the corresponding channel identication of said ALC controlling value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810065976A CN101494753B (en) | 2008-01-22 | 2008-01-22 | Method and apparatus for adjusting sound volume |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810065976A CN101494753B (en) | 2008-01-22 | 2008-01-22 | Method and apparatus for adjusting sound volume |
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| CN101494753A CN101494753A (en) | 2009-07-29 |
| CN101494753B true CN101494753B (en) | 2012-09-05 |
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| CN200810065976A Active CN101494753B (en) | 2008-01-22 | 2008-01-22 | Method and apparatus for adjusting sound volume |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101494752B (en) * | 2008-01-22 | 2013-01-09 | 深圳Tcl新技术有限公司 | Method and apparatus for adjusting sound volume |
| CN105307012B (en) * | 2015-11-20 | 2019-06-14 | 青岛海信电器股份有限公司 | A kind of television volume regulating method and device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4553257A (en) * | 1982-04-28 | 1985-11-12 | Pioneer Electronic Corp. | Automatic sound volume control device |
| CN1166723A (en) * | 1996-04-12 | 1997-12-03 | 三星电子株式会社 | Method and apparatus for controlling volume in audio/video equipment |
| CN1201324A (en) * | 1997-05-30 | 1998-12-09 | 大宇电子株式会社 | Apparatus and method for automatically setting automatic gain-control regulation-value of television system |
| CN1725827A (en) * | 2004-07-24 | 2006-01-25 | 三星电子株式会社 | Equipment and method in response to the automatic compensating audio volume of channel change |
| CN101044786A (en) * | 2004-10-21 | 2007-09-26 | 皇家飞利浦电子股份有限公司 | Loudspeaker feedback |
-
2008
- 2008-01-22 CN CN200810065976A patent/CN101494753B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4553257A (en) * | 1982-04-28 | 1985-11-12 | Pioneer Electronic Corp. | Automatic sound volume control device |
| CN1166723A (en) * | 1996-04-12 | 1997-12-03 | 三星电子株式会社 | Method and apparatus for controlling volume in audio/video equipment |
| CN1201324A (en) * | 1997-05-30 | 1998-12-09 | 大宇电子株式会社 | Apparatus and method for automatically setting automatic gain-control regulation-value of television system |
| CN1725827A (en) * | 2004-07-24 | 2006-01-25 | 三星电子株式会社 | Equipment and method in response to the automatic compensating audio volume of channel change |
| CN101044786A (en) * | 2004-10-21 | 2007-09-26 | 皇家飞利浦电子股份有限公司 | Loudspeaker feedback |
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| CN101494753A (en) | 2009-07-29 |
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