CN103414443A - Automatic volume control method and automatic volume control system - Google Patents
Automatic volume control method and automatic volume control system Download PDFInfo
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Abstract
The invention relates to an automatic volume control method. The automatic volume control method comprises an input audio volume comparison step, an audio output step, a volume decrease step and a volume increase step. In the input audio volume comparison step, an input audio volume is compared with a preset volume range in real time within preset detection time, and whether the input audio volume is kept within the preset volume range is judged; if the input audio volume is kept within the preset volume range, the audio output step is executed; if the input audio volume is kept higher than the maximum volume of the preset volume range, the volume decrease step is executed; if the input audio volume is kept lower than the minimum volume of the preset volume range, the volume increase step is executed. In the audio output step, the input audio is output directly. In the volume decrease step, the input audio volume is gradually reduced to a target audio volume in a preset decrease time period. In the volume increase step, the input audio volume is gradually increased to a target audio volume in a preset increase time period. The automatic volume control method can reduce output audio noise and optimize the tone quality of output audio. The invention further relates to an automatic volume control system.
Description
Technical field
The present invention relates to a kind of volume automatic control method and Automatic control of sound volume system.
Background technology
At present, the predefined constant gain multiple of general employing is regulated the volume of input audio frequency, for example, if the volume of input audio frequency is less than threshold value, with above-mentioned gain multiple, will input the volume increase of audio frequency, input audio volume instantaneous variation, to the target volume, can produce a large amount of noises, reduces the tonequality of output audio.
In addition, it is not ideal enough when this kind mode is applied to the audio volume of regulating multiple source, for example, if regulate to the audio volume from microphone with from the audio volume of DVD by this kind mode, if the audio volume of microphone is much smaller than the audio volume of DVD, in the morbid sound so finally modulated, the volume of corresponding microphone audio still can be much smaller than the volume of corresponding DVD audio frequency, therefore, for making two kinds of wave volumes, coordinate, often need by the volume of manual adjustments microphone and the volume of DVD, waste time and energy, and regulate inaccurate.
Summary of the invention
For the deficiencies in the prior art, purpose of the present invention is intended to provide a kind of volume automatic control method and Automatic control of sound volume system, and it can reduce the output audio noise, optimizes the tonequality of output audio.
For achieving the above object, the present invention adopts following technical scheme:
A kind of volume automatic control method, it comprises the following steps:
Input audio volume comparison step: will input in real time audio volume and compare with default volume range within default detection time, whether judgement input audio volume remains in volume range, if the input audio volume remains in volume range, carry out audio frequency output step; If the input audio volume keeps being greater than the max volume of volume range, carry out the volume attenuation step; If the input audio volume keeps being less than the minimal volume of volume range, carry out the volume gain step;
Audio frequency output step: directly should input audio frequency output;
Volume attenuation step: will input audio volume in default die-away time in section and decay to gradually the target audio volume; And
Volume gain step: will input audio volume and gain gradually to the target audio volume in default gain time section;
Wherein, above-mentioned target audio volume is in above-mentioned volume range.
Further, the volume attenuation step comprises following sub-step:
Volume decay comparison step: will input audio volume and compare with default one-level volume threshold, wherein, the one-level volume threshold is greater than above-mentioned max volume, when the input audio volume is between above-mentioned max volume and one-level volume threshold, carries out one-level volume attenuation step; When the input audio volume is greater than the one-level volume threshold, carry out secondary volume attenuation step;
One-level volume attenuation step: will input audio volume in default die-away time in section and decay to gradually the target audio volume with the one-level attenuation coefficient, if die-away time, section was T, the input audio volume is d1, the target audio volume is d2, the one-level attenuation coefficient is-k1, wherein, T, d1, d2 and k1 are positive number, each parameter of this step meet following relational expression: d2=-k1*T+d1; And
Secondary volume attenuation step: will input audio volume in default die-away time in section and decay to gradually the target audio volume with the secondary attenuation coefficient, die-away time, section was T, the input audio volume is d1, the audio volume of bidding is d3, the secondary attenuation coefficient is-k2 that wherein, T, d1, d3 and k2 are positive number, and k2 is greater than k1, each parameter of this step meet following relational expression: d3=-k2*T+d1.
Further, the volume gain step comprises following sub-step:
Volume gain comparison step: will input audio volume and compare with default secondary volume threshold, wherein, the secondary volume threshold is less than above-mentioned minimal volume, when the input audio volume is between above-mentioned minimal volume and secondary volume threshold, carries out one-level volume gain step; When the input audio volume is less than the secondary volume threshold, carry out secondary volume gain step;
One-level volume gain step: will input audio volume and gain gradually to the target audio volume with the one-level gain coefficient in default gain time section, if the gain time section is T ', the input audio volume is d1 ', the target audio volume is d2 ', the one-level gain coefficient is k1 ', wherein, T ', d1 ', d2 ' and k1 ' are positive number, and above-mentioned each parameter meets following relational expression: d2 '=k1 ' * T '+d1 '; And
Secondary volume gain step: will input audio volume and gain gradually to the target audio volume with the secondary gain coefficient in default gain time section, if the gain time section is T ', the input audio volume is d1 ', the target audio volume is d3 ', the secondary gain coefficient is k2 ', and wherein, T ', d1 ', d3 ' and k2 ' are positive number, and k2 ' is greater than k1 ', each parameter of this step meets following relational expression: d3 '=k2 ' * T '+d1 '.
The invention still further relates to following technical scheme:
A kind of Automatic control of sound volume system, it comprises with lower module:
Input audio volume comparison module, for in the detection time default, inputting in real time audio volume, compare with default volume range, whether judgement input audio volume remains in volume range, if the input audio volume remains in volume range, carries out the audio frequency output module; If the input audio volume keeps being greater than the max volume of volume range, carry out the volume attenuation module; If the input audio volume keeps being less than the minimal volume of volume range, carry out the volume gain module;
The audio frequency output module, for directly inputting audio frequency output;
The volume attenuation module, decay to the target audio volume gradually in section, inputting audio volume the die-away time default; And
The volume gain module, gain to the target audio volume gradually in the gain time section default, inputting audio volume;
Wherein, above-mentioned target audio volume is in above-mentioned volume range.
Further, the volume attenuation module comprises following submodule:
Volume decay comparison module, for inputting audio volume, compare with default one-level volume threshold, wherein, the one-level volume threshold is greater than above-mentioned max volume, when the input audio volume is between above-mentioned max volume and one-level volume threshold, carry out one-level volume attenuation module; When the input audio volume is greater than the one-level volume threshold, carry out secondary volume attenuation module;
One-level volume attenuation module, for in section, inputting audio volume default die-away time, decay to gradually the target audio volume with the one-level attenuation coefficient, if die-away time, section was T, the input audio volume is d1, the target audio volume is d2, and the one-level attenuation coefficient is-k1, wherein, T, d1, d2 and k1 are positive number, each parameter of this step meet following relational expression: d2=-k1*T+d1; And
Secondary volume attenuation module, for in section, inputting audio volume the die-away time default, decay to gradually the target audio volume with the secondary attenuation coefficient, die-away time, section was T, the input audio volume is d1, and the audio volume of bidding is d3, and the secondary attenuation coefficient is-k2, wherein, T, d1, d3 and k2 are positive number, and k2 is greater than k1, each parameter of this step meet following relational expression: d3=-k2*T+d1.
Further, the volume gain module comprises following submodule:
The volume gain comparison module, for inputting audio volume, compare with default secondary volume threshold, wherein, the secondary volume threshold is less than above-mentioned minimal volume, when the input audio volume is between above-mentioned minimal volume and secondary volume threshold, carry out one-level volume gain module; When the input audio volume is less than the secondary volume threshold, carry out secondary volume gain module;
One-level volume gain module, for in the gain time section default, inputting audio volume, gain gradually to the target audio volume with the one-level gain coefficient, if the gain time section is T ', the input audio volume is d1 ', the target audio volume is d2 ', and the one-level gain coefficient is k1 ', wherein, T ', d1 ', d2 ' and k1 ' are positive number, and above-mentioned each parameter meets following relational expression: d2 '=k1 ' * T '+d1 '; And
Secondary volume gain module, for in the gain time section default, inputting audio volume, gain gradually to the target audio volume with the secondary gain coefficient, if the gain time section is T ', the input audio volume is d1 ', and the target audio volume is d3 ', and the secondary gain coefficient is k2 ', wherein, T ', d1 ', d3 ' and k2 ' are positive number, and k2 ' is greater than k1 ', and each parameter of this step meets following relational expression: d3 '=k2 ' * T '+d1 '.
Beneficial effect of the present invention is as follows:
1, whether foregoing invention judgement input audio volume within default detection time keeps wherein a kind of stabilization result just to carry out next step, can avoid because erroneous judgement produces wrong execution, thereby can guarantee modification stability.
2, decay or gain volume gradually in die-away time of the present invention section or gain time section, can avoid producing noise, thereby optimize the tonequality of output audio.
3, the present invention decays to the input audio volume with the attenuation coefficient of different stage size according to the different range of input audio volume, thereby can solve suddenly big or suddenly small problem, for example, the music of playing as DVD is during much larger than the sound of microphone, if with traditional volume control mode, microphone voice after processing still can be more much smaller than the music that DVD plays, often need manually to adjust microphone voice or DVD volume of music and make both volume couplings, bother very much, waste time and energy, and the music that the present invention can be automatically plays microphone voice and DVD is adjusted in rational volume range, thereby make mixed sound more harmonious, tonequality is better.
4, the present invention is by the software control volume, and tradition utilizes the circuit that electronic component forms to control volume relatively, and the present invention not only can greatly reduce cost, and applied range, is not subjected to the restriction of device space volume.
The accompanying drawing explanation
Fig. 1 is the flow chart of the preferred embodiments of volume automatic control method of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described further:
Refer to Fig. 1, the present invention relates to a kind of volume automatic control method, its preferred embodiments comprises the following steps:
Input audio volume comparison step: will input in real time audio volume and compare with default volume range within default detection time, whether judgement input audio volume remains in volume range, if the input audio volume remains in volume range, carry out audio frequency output step; If the input audio volume keeps being greater than the max volume of volume range, carry out the volume attenuation step; If the input audio volume keeps being less than the minimal volume of volume range, carry out the volume gain step.
Whether judgement input audio volume within default detection time keeps wherein a kind of stabilization result just to carry out next step, can avoid because erroneous judgement produces wrong execution, thereby can guarantee modification stability.
Audio frequency output step: directly should input audio frequency output.
The volume attenuation step: in default die-away time, will input audio volume in section and decay to gradually the target audio volume, this target audio volume is the volume of output audio; Relatively prior art moment will input audio volume and decay to the output audio volume, and this step volume that decays gradually in section in die-away time, can avoid producing noise, thus the tonequality of optimization output audio.Preferably, this step comprises following sub-step:
Volume decay comparison step: will input audio volume and compare with default one-level volume threshold, wherein, the one-level volume threshold is greater than above-mentioned max volume, when the input audio volume is between above-mentioned max volume and one-level volume threshold, carries out one-level volume attenuation step; When the input audio volume is greater than the one-level volume threshold, carry out secondary volume attenuation step;
One-level volume attenuation step: will input audio volume in default die-away time in section and decay to gradually the target audio volume with the one-level attenuation coefficient, if die-away time, section was T, the input audio volume is d1, the target audio volume is d2, the one-level attenuation coefficient is-k1, wherein, T, d1, d2 and k1 are positive number, each parameter of this step meet following relational expression: d2=-k1*T+d1; And
Secondary volume attenuation step: will input audio volume in default die-away time in section and decay to gradually the target audio volume with the secondary attenuation coefficient, die-away time, section was T, the input audio volume is d1, the audio volume of bidding is d3, the secondary attenuation coefficient is-k2, wherein, T, d1, d3 and k2 are positive number, each parameter of this step meet following relational expression: d3=-k2*T+d1.
The present invention decays to the input audio volume with the attenuation coefficient of different stage size according to the different range of input audio volume, thereby can solve suddenly big or suddenly small problem, for example, the music of playing as DVD is during much larger than the sound of microphone, if with traditional volume control mode, microphone voice after processing still can be more much smaller than the music that DVD plays, often need manually to adjust microphone voice or DVD volume of music and make both volume couplings, bother very much, waste time and energy, and the music that the present invention can be automatically plays microphone voice and DVD is adjusted in rational volume range, thereby make mixed sound more harmonious, tonequality is better.
And
Volume gain step: will input audio volume and gain gradually to the target audio volume in default gain time section; Relatively prior art moment will input audio volume and gain to the output audio volume, and this step volume that gains gradually in the gain time section, can avoid producing noise, thus the tonequality of optimization output audio.Preferably, this step comprises following sub-step:
Volume gain comparison step: will input audio volume and compare with default secondary volume threshold, wherein, the secondary volume threshold is less than above-mentioned minimal volume, when the input audio volume is between above-mentioned minimal volume and secondary volume threshold, carries out one-level volume gain step; When the input audio volume is less than the secondary volume threshold, carry out secondary volume gain step;
One-level volume gain step: will input audio volume and gain gradually to the target audio volume with the one-level gain coefficient in default gain time section, if the gain time section is T ', the input audio volume is d1 ', the target audio volume is d2 ', the one-level gain coefficient is k1 ', wherein, T ', d1 ', d2 ' and k1 ' are positive number, and above-mentioned each parameter meets following relational expression: d2 '=k1 ' * T '+d1 '.And
Secondary volume gain step: will input audio volume and gain gradually to the target audio volume with the secondary gain coefficient in default gain time section, if the gain time section is T ', the input audio volume is d1 ', the target audio volume is d3 ', the secondary gain coefficient is k2 ', wherein, T ', d1 ', d3 ' and k2 ' are positive number, and each parameter of this step meets following relational expression: d3 '=k2 ' * T '+d1 '.
Above-mentionedly with the one-level volume threshold, carry out demarcation interval only for convenience of description, in other embodiment, also the scope that is greater than above-mentioned max volume can be divided into to a plurality of subintervals by multistage volume threshold by it, interval more accurate to the correction of volume more at most, principle is same as described above, repeat no more, in like manner, also can be divided into a plurality of subintervals by multistage volume threshold for the scope that is less than above-mentioned minimal volume.
The invention still further relates to a kind of Automatic control of sound volume system, its preferred embodiments comprises:
Input audio volume comparison module, for in the detection time default, inputting in real time audio volume, compare with default volume range, whether judgement input audio volume remains in volume range, if the input audio volume remains in volume range, carries out the audio frequency output module; If the input audio volume keeps being greater than the max volume of volume range, carry out the volume attenuation module; If the input audio volume keeps being less than the minimal volume of volume range, carry out the volume gain module.
The audio frequency output module, for directly inputting audio frequency output.
The volume attenuation module, decay to the target audio volume gradually in section, inputting audio volume the die-away time default, and this target audio volume is the volume of output audio; Preferably, this step comprises following submodule;
Volume decay comparison module, for inputting audio volume, compare with default one-level volume threshold, wherein, the one-level volume threshold is greater than above-mentioned max volume, when the input audio volume is between above-mentioned max volume and one-level volume threshold, carry out one-level volume attenuation module; When the input audio volume is greater than the one-level volume threshold, carry out secondary volume attenuation module;
One-level volume attenuation module, for in section, inputting audio volume the die-away time default, decay to gradually the target audio volume with the one-level attenuation coefficient, if die-away time, section was T, the input audio volume is d1, the target audio volume is d2, and the one-level attenuation coefficient is-k1, wherein, T, d1, d2 and k1 are positive number, each parameter of this module meet following relational expression: d2=-k1*T+d1; And
Secondary volume attenuation module, for in section, inputting audio volume the die-away time default, decay to gradually the target audio volume with the secondary attenuation coefficient, die-away time, section was T, the input audio volume is d1, the audio volume of bidding is d3, and the secondary attenuation coefficient is-k2, wherein, T, d1, d3 and k2 are positive number, each parameter of this module meet following relational expression: d3=-k2*T+d1.And
The volume gain module, gain to the target audio volume gradually in the gain time section default, inputting audio volume; Preferably, this module comprises following submodule:
The volume gain comparison module, for inputting audio volume, compare with default secondary volume threshold, wherein, the secondary volume threshold is less than above-mentioned minimal volume, when the input audio volume is between above-mentioned minimal volume and secondary volume threshold, carry out one-level volume gain module; When the input audio volume is less than the secondary volume threshold, carry out secondary volume gain module;
One-level volume gain module, for in the gain time section default, inputting audio volume, gain gradually to the target audio volume with the one-level gain coefficient, if the gain time section is T ', the input audio volume is d1 ', the target audio volume is d2 ', and the one-level gain coefficient is k1 ', wherein, T ', d1 ', d2 ' and k1 ' are positive number, and each parameter of this module meets following relational expression: d2 '=k1 ' * T '+d1 '; And
Secondary volume gain module, for in the gain time section default, inputting audio volume, gain gradually to the target audio volume with the secondary gain coefficient, if the gain time section is T ', the input audio volume is d1 ', the target audio volume is d3 ', and the secondary gain coefficient is k2 ', wherein, T ', d1 ', d3 ' and k2 ' are positive number, and each parameter of this module meets following relational expression: d3 '=k2 ' * T '+d1 '.
Wherein, above-mentioned target audio volume is in above-mentioned volume range.
For a person skilled in the art, can make other various corresponding changes and distortion according to technical scheme described above and design, and these all changes and the distortion all should belong to the protection range of the claims in the present invention within.
Claims (6)
1. volume automatic control method, it is characterized in that: it comprises the following steps:
Input audio volume comparison step: will input in real time audio volume and compare with default volume range within default detection time, whether judgement input audio volume remains in volume range, if the input audio volume remains in volume range, carry out audio frequency output step; If the input audio volume keeps being greater than the max volume of volume range, carry out the volume attenuation step; If the input audio volume keeps being less than the minimal volume of volume range, carry out the volume gain step;
Audio frequency output step: directly should input audio frequency output;
Volume attenuation step: will input audio volume in default die-away time in section and decay to gradually the target audio volume; And
Volume gain step: will input audio volume and gain gradually to the target audio volume in default gain time section;
Wherein, above-mentioned target audio volume is in above-mentioned volume range.
2. volume automatic control method as claimed in claim 1, it is characterized in that: the volume attenuation step comprises following sub-step:
Volume decay comparison step: will input audio volume and compare with default one-level volume threshold, wherein, the one-level volume threshold is greater than above-mentioned max volume, when the input audio volume is between above-mentioned max volume and one-level volume threshold, carries out one-level volume attenuation step; When the input audio volume is greater than the one-level volume threshold, carry out secondary volume attenuation step;
One-level volume attenuation step: will input audio volume in default die-away time in section and decay to gradually the target audio volume with the one-level attenuation coefficient, if die-away time, section was T, the input audio volume is d1, the target audio volume is d2, the one-level attenuation coefficient is-k1, wherein, T, d1, d2 and k1 are positive number, each parameter of this step meet following relational expression: d2=-k1*T+d1; And
Secondary volume attenuation step: will input audio volume in default die-away time in section and decay to gradually the target audio volume with the secondary attenuation coefficient, die-away time, section was T, the input audio volume is d1, the audio volume of bidding is d3, the secondary attenuation coefficient is-k2 that wherein, T, d1, d3 and k2 are positive number, and k2 is greater than k1, each parameter of this step meet following relational expression: d3=-k2*T+d1.
3. volume automatic control method as claimed in claim 1 or 2, it is characterized in that: the volume gain step comprises following sub-step:
Volume gain comparison step: will input audio volume and compare with default secondary volume threshold, wherein, the secondary volume threshold is less than above-mentioned minimal volume, when the input audio volume is between above-mentioned minimal volume and secondary volume threshold, carries out one-level volume gain step; When the input audio volume is less than the secondary volume threshold, carry out secondary volume gain step;
One-level volume gain step: will input audio volume and gain gradually to the target audio volume with the one-level gain coefficient in default gain time section, if the gain time section is T ', the input audio volume is d1 ', the target audio volume is d2 ', the one-level gain coefficient is k1 ', wherein, T ', d1 ', d2 ' and k1 ' are positive number, and above-mentioned each parameter meets following relational expression: d2 '=k1 ' * T '+d1 '; And
Secondary volume gain step: will input audio volume and gain gradually to the target audio volume with the secondary gain coefficient in default gain time section, if the gain time section is T ', the input audio volume is d1 ', the target audio volume is d3 ', the secondary gain coefficient is k2 ', and wherein, T ', d1 ', d3 ' and k2 ' are positive number, and k2 ' is greater than k1 ', each parameter of this step meets following relational expression: d3 '=k2 ' * T '+d1 '.
4. Automatic control of sound volume system, it is characterized in that: it comprises with lower module:
Input audio volume comparison module, for in the detection time default, inputting in real time audio volume, compare with default volume range, whether judgement input audio volume remains in volume range, if the input audio volume remains in volume range, carries out the audio frequency output module; If the input audio volume keeps being greater than the max volume of volume range, carry out the volume attenuation module; If the input audio volume keeps being less than the minimal volume of volume range, carry out the volume gain module;
The audio frequency output module, for directly inputting audio frequency output;
The volume attenuation module, decay to the target audio volume gradually in section, inputting audio volume the die-away time default; And
The volume gain module, gain to the target audio volume gradually in the gain time section default, inputting audio volume;
Wherein, above-mentioned target audio volume is in above-mentioned volume range.
5. Automatic control of sound volume system as claimed in claim 4, it is characterized in that: the volume attenuation module comprises following submodule:
Volume decay comparison module, for inputting audio volume, compare with default one-level volume threshold, wherein, the one-level volume threshold is greater than above-mentioned max volume, when the input audio volume is between above-mentioned max volume and one-level volume threshold, carry out one-level volume attenuation module; When the input audio volume is greater than the one-level volume threshold, carry out secondary volume attenuation module;
One-level volume attenuation module, for in section, inputting audio volume default die-away time, decay to gradually the target audio volume with the one-level attenuation coefficient, if die-away time, section was T, the input audio volume is d1, the target audio volume is d2, and the one-level attenuation coefficient is-k1, wherein, T, d1, d2 and k1 are positive number, each parameter of this step meet following relational expression: d2=-k1*T+d1; And
Secondary volume attenuation module, for in section, inputting audio volume the die-away time default, decay to gradually the target audio volume with the secondary attenuation coefficient, die-away time, section was T, the input audio volume is d1, and the audio volume of bidding is d3, and the secondary attenuation coefficient is-k2, wherein, T, d1, d3 and k2 are positive number, and k2 is greater than k1, each parameter of this step meet following relational expression: d3=-k2*T+d1.
6. Automatic control of sound volume system as described as claim 4 or 5, it is characterized in that: the volume gain module comprises following submodule:
The volume gain comparison module, for inputting audio volume, compare with default secondary volume threshold, wherein, the secondary volume threshold is less than above-mentioned minimal volume, when the input audio volume is between above-mentioned minimal volume and secondary volume threshold, carry out one-level volume gain module; When the input audio volume is less than the secondary volume threshold, carry out secondary volume gain module;
One-level volume gain module, for in the gain time section default, inputting audio volume, gain gradually to the target audio volume with the one-level gain coefficient, if the gain time section is T ', the input audio volume is d1 ', the target audio volume is d2 ', and the one-level gain coefficient is k1 ', wherein, T ', d1 ', d2 ' and k1 ' are positive number, and above-mentioned each parameter meets following relational expression: d2 '=k1 ' * T '+d1 '; And
Secondary volume gain module, for in the gain time section default, inputting audio volume, gain gradually to the target audio volume with the secondary gain coefficient, if the gain time section is T ', the input audio volume is d1 ', and the target audio volume is d3 ', and the secondary gain coefficient is k2 ', wherein, T ', d1 ', d3 ' and k2 ' are positive number, and k2 ' is greater than k1 ', and each parameter of this step meets following relational expression: d3 '=k2 ' * T '+d1 '.
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