Volume control method and equipment
A volume control and audio signal technology, applied in the direction of gain control, amplification control, electrical components, etc., to achieve the effect of limiting the volume range and reducing distortion in real time
Inactive Publication Date: 2011-08-17
HAIER BEIJING IC DESIGN
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Problems solved by technology
There are two kinds of limiting methods commonly used in the time domain. One is the limiting of the nonlinear transformation of the signal, such as clipping the signal. The advantage of this is that it has good real-time performance (that is, dealing with sudden sound increases) , but the disadvantage is that it is seriously distorted for larger sounds, so it is difficult to process signals with a larger dynamic range
Another method is to linearly transform the entire range of the signal according to the current dynamic range. The advantage of this is that there is no distortion, but the disadvantage is that the method for determining the dynamic range needs to combine real-time and effectiveness. In practice Not easy to grasp in application
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[0018] Combine below figure 1 with figure 2 The method of the present invention will be described in detail.
[0019] First, the system or the user gives two parameters D and B, where D is the output range of the linear region, that is, the output range of the signal linear transformation is between [-D, D], and B is the maximum output range of the system. The output range is between [-B, B].
[0020] Such as figure 1 , First determine whether the input signal is in the linear region. If the range of the linear region of the input signal x is: -aD≤x≤aD; where a is the linear region control factor, a≥1; the range of the non-linear region of x is: x<-aD or aD<x.
[0021] If x is in the linear region, the transformed value is: f ( x ) = x a , Direct output.
[0022] If x is not in the linear region, the transformation is performed in two cases:
[0023] When x f ( x ) = - D - ( B - D ) g ( - x + aD aB - aD ...
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The invention discloses a volume control method, which comprises the following steps: (1) inputting audio signals; (2) setting a linear region and a nonlinear region of the audio signals ; (3) judging whether the audio signals are in the linear region or not; (4) dealing with the audio signals according to the linear transformation if the audio signals are in the linear region, or dealing with the audio signals according to the non-linear transformation. Besides, the linear region and the nonlinear region of the audio signals which are arranged in the step (2) can be adjusted by overall monitoring the audio signals. The invention also comprises the device which is used for realizing the volume control method, which comprises an input module, a monitoring and adjusting module in the linearregion and the nonlinear region of the audio signals; a judgment module, a linear transformation module, a nonlinear transformation module and an output module. The method and the device of the invention reach the function of real-time limiting the volume range by the nonlinear transformation part, adjust the range of linear region and the nonlinear region by overall monitoring the signals, thereby achieving the effect of reducing distortion by monitoring.
Description
technical field [0001] The invention relates to the field of volume control in general electronic equipment, in particular to a method and equipment for controlling the volume range on an audio playback device. Background technique [0002] With the popularization and application of modern multimedia technology, audio playback equipment is also becoming more and more popular. From the traditional radio, TV, portable to modern MP3, MP4, etc., there are corresponding audio playback modules. While audio equipment brings us a lot of convenience, there are also some problems. In many cases, due to the different dynamic range of the sound source, the sound often appears loud and soft. For example, due to switching channels or program changes during listening, the volume will suddenly increase, or when listening to MP3, some music volumes are louder while others are quieter. In these cases, if the volume suddenly increases, it often brings great discomfort to people, or disturb...
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IPC IPC(8): H03G3/20
Inventor 史岩
Owner HAIER BEIJING IC DESIGN