CN111131965A - Audio system with protection function and adjusting method thereof - Google Patents
Audio system with protection function and adjusting method thereof Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
- G10L19/16—Vocoder architecture
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Abstract
The invention discloses an audio system with a protection function and an adjusting method thereof, wherein the adjusting method mainly comprises the following steps: the A/D conversion unit converts the input current frame audio signal into a digital signal; the EQ unit performs gain processing on the current frame audio signal converted into the digital signal; the compression unit receives the current frame audio signal output by the EQ unit, compares the energy of the current frame audio signal with a compression starting threshold value, and judges whether the current frame audio signal needs to be compressed or not according to a comparison result; the D/A conversion unit converts the current frame audio signal processed by the compression unit into an analog signal; the power amplification unit amplifies the analog signal output by the D/A conversion unit and drives a loudspeaker to play sound; the audio system with the protection function and the adjusting method thereof provided by the invention have the advantages that the compression unit with the protection function is added in the audio system, and the burning caused by the overlarge signal energy received by the power amplification unit is avoided.
Description
Technical Field
The invention relates to the technical field of audio processing, in particular to an audio system with a protection function and an adjusting method thereof.
Background
An EQ (Equalizer) is an electronic device that can adjust the amount of signal amplification in each frequency band, and is widely used in audio systems in various industries; typical device sound managers, digital audio processors, generally employ two EQs, a pictorial EQ and a full parametric EQ.
FIR (finite length single impulse response filter), also called non-recursive filter, is the most basic element in digital signal processing systems, and it can guarantee arbitrary amplitude-frequency characteristics while having strict linear phase-frequency characteristics, and its unit sampling response is finite length, so that the filter is a stable system and is commonly used in various systems of audio.
The principle of the EQ regulation of the audio system is: the audio signal is processed by the EQ unit to change the gain of each frequency band of the audio signal, then the audio signal is converted into an analog signal by the D/A conversion unit, and finally the audio signal is amplified by the power amplification unit to drive the loudspeaker to play sound.
The existing principle of EQ regulation in audio systems has the following drawbacks:
1. no protection function: if the gain of the EQ unit corresponding to a certain frequency band is greatly increased, the energy of the certain frequency band can exceed the bearing capacity of the power amplification unit, and the sound played by the loudspeaker is distorted;
2. no automatic equalization correction function: when a microphone is used for inputting human voice signals, if the energy of a certain frequency band is insufficient, the sound output by a loudspeaker can be uncomfortable in hearing sense;
3. no phase calibration function: each functional module needs processing time, namely, the signal source input and the final loudspeaker output signal have phase deviation; in some high-level sound systems, the presence of a phase offset between the input signal and the output signal can severely affect the auditory effect.
Disclosure of Invention
In view of the above disadvantages of the prior art, an object of the present invention is to provide an audio system with a protection function and an adjusting method thereof, in which a compression unit is added between an EQ unit and a power amplifier unit to play a role in protection, thereby avoiding signal energy received by the power amplifier unit from being too large to cause burnout.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for adjusting an audio system with a protection function, comprising the steps of:
s100, converting an input current frame audio signal into a digital signal by an A/D conversion unit;
s200, performing gain processing on the current frame audio signal converted into the digital signal by an EQ unit;
s300, the compression unit receives the current frame audio signal output by the EQ unit, and if the energy of the current frame audio signal is larger than a set compression starting threshold, the compression unit compresses the energy of the current frame audio signal according to a set compression ratio; if the energy of the current frame audio signal is less than or equal to the set compression starting threshold, the compression unit stops working;
s400, converting the current frame audio signal processed by the compression unit into an analog signal by a D/A conversion unit;
and S500, the power amplification unit receives and amplifies the analog signal output by the D/A conversion unit and drives a loudspeaker to play sound.
The method for adjusting the audio system with the protection function further comprises the following steps:
s310, an automatic adjusting unit receives the current frame audio signal processed by the compressing unit;
s311, calculating the frequency spectrum of the current frame audio signal and the energy value of each frequency band by the automatic adjusting unit according to the current frame audio signal;
s312, the automatic adjusting unit obtains EQ adjusting parameters according to the energy values of all frequency bands of the current frame audio signal and the gain parameters corresponding to all the frequency bands;
s313, the automatic adjusting unit feeds the EQ adjusting parameters back to the EQ unit, and the EQ unit performs gain processing on the audio signals of the next frame according to the EQ adjusting parameters.
The method for adjusting the audio system with the protection function further comprises the following steps:
s600, a sound pickup picks up audio signals output by a loudspeaker;
s700, an FIR (finite impulse response) calculating unit acquires a first audio signal of an A/D (analog/digital) conversion unit and a second audio signal acquired by a sound pickup, calculates a phase offset parameter according to the first audio signal and the second audio signal and feeds the phase offset parameter back to a phase unit;
and S800, the phase unit performs phase compensation correction on the audio signal of the next frame according to the received phase offset parameter.
In the adjusting method of the audio system with a protection function, in step S313, the EQ unit adjusts the gain G and the quality factor Q of the frequency spectrum of the current frame signal according to the received EQ adjustment parameter, and recalculates the filter coefficient COEFF of the full parameter equalization PEQ; when the audio signal of the next frame is input, the EQ unit adjusts the input audio signal of the next frame using the calculated filter coefficient COEFF.
In the adjusting method of the audio system with the protection function, in the step S700, the FIR unit stores 1024 samples of the first audio signal and the second audio signal, calculates a phase difference between the two samples by a correlation analysis method, performs fast fourier transform on the 1024 samples of the first audio signal and the second audio signal, finds a main frequency band, processes the main frequency band by using an FIR filter, and calculates a phase difference offset parameter.
The invention also provides an audio system with a protection function, which comprises:
the A/D conversion unit is used for receiving the current frame audio signal and converting the current frame audio signal into a digital signal;
the EQ unit is used for receiving the digital signal of the A/D conversion unit and performing gain processing on the current frame audio signal;
the compression unit is used for receiving the current frame audio signal processed by the EQ unit, comparing the energy value of the current frame audio signal with a set energy threshold value and judging whether compression processing is needed or not;
the D/A conversion unit is used for receiving the current frame audio signal processed by the compression unit and converting the current frame audio signal into an analog signal;
and the power amplifier unit is used for receiving the analog signal output by the D/A conversion unit, amplifying the analog signal and driving the loudspeaker to play sound.
The audio system with the protection function further comprises an automatic adjusting unit, wherein the automatic adjusting unit is used for receiving the current frame audio signal processed by the compressing unit, calculating the energy value of each frequency band according to the current frame audio signal, obtaining EQ adjusting parameters according to the energy value of each frequency band and the gain parameters corresponding to each frequency band, and feeding the EQ adjusting parameters back to the EQ unit.
In the audio system with protection function, the method further comprises:
the sound pickup is used for acquiring an audio signal output by the loudspeaker;
an FIR calculation unit for acquiring the first audio signal picked up by the sound pickup and the second audio signal acquired by the a/D conversion unit and calculating a phase offset parameter;
and the phase unit is used for receiving the phase offset parameter output by the FIR calculation unit and carrying out phase compensation correction on the audio signal of the next frame.
Has the advantages that:
the invention provides an audio system with a protection function and an adjusting method thereof, and the audio system with the protection function has the following advantages:
(1) in the audio system, a compression unit is arranged between an EQ unit and a power amplification unit, and the compression unit compresses audio signals with energy values larger than a set compression starting threshold value and outputs normal audio signals to protect the power amplification unit at the rear end so as to prevent the audio signals received by the power amplification unit from being burnt due to overlarge energy values;
(2) the audio system is provided with an automatic adjusting unit, can automatically detect insufficient frequency spectrum and the energy value of the frequency spectrum in real time and feed back the insufficient frequency spectrum and the energy value to the EQ unit, so that the EQ unit can adjust the next frame of audio signals conveniently, and the auditory effect is improved;
(3) the audio system comprises a sound pick-up, an FIR (finite impulse response) calculation unit and a phase unit, realizes the phase correction function of the audio system, enables the phase of an output audio signal to be as close as possible to the phase of an input audio signal, and further improves the auditory effect.
Drawings
FIG. 1 is a control flow diagram of a conditioning method provided by the present invention;
FIG. 2 is a control flow diagram of the automatic adjustment unit provided by the present invention;
FIG. 3 is a control flow diagram of another embodiment of a regulation method provided by the present invention;
fig. 4 is a schematic structural diagram of an audio system with a protection function according to the present invention;
fig. 5 is a schematic structural diagram of an audio system with a protection function according to another embodiment of the present invention.
Detailed Description
The invention provides an audio system with a protection function and an adjusting method thereof, and in order to make the purpose, technical scheme and effect of the invention clearer and clearer, the invention is further described in detail below by referring to the attached drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention.
In the description of the present invention, unless otherwise explicitly specified and limited, the terms "mounted," "connected," and the like are to be construed broadly, and the specific meanings of the above terms in the present invention may be understood by those skilled in the art as appropriate.
Referring to fig. 1, the present invention provides a method for adjusting an audio system with a protection function, comprising the following steps:
s100, converting an input current frame audio signal into a digital signal by an A/D conversion unit;
s200, performing gain processing on the current frame audio signal converted into the digital signal by an EQ unit;
s300, the compression unit receives the current frame audio signal output by the EQ unit, and if the energy of the current frame audio signal is larger than a set compression starting threshold, the compression unit compresses the energy of the current frame audio signal after the starting time according to a set compression ratio; if the energy of the current frame audio signal is less than or equal to the set compression starting threshold, the compression unit stops working after the release time;
s400, converting the current frame audio signal processed by the compression unit into an analog signal by a D/A conversion unit;
and S500, the power amplification unit receives and amplifies the analog signal output by the D/A conversion unit and drives a loudspeaker to play sound.
In this embodiment, related parameters of the compression unit, such as a compression start threshold, a compression ratio, a start time, and a release time, may be set in the controller in advance, and different values may be set according to different sound application environments; the starting time refers to the time point when the compression unit starts to work, and the releasing time refers to the time point when the compression unit does not work and outputs the audio signal; the range of the compression start threshold value is generally-3 dB to 12dB, if the energy of the audio signal of the current frame is greater than the set compression start threshold value, the compression unit starts the compression function and outputs a normal audio signal to protect the power amplification unit at the rear end, so that the power amplification unit is prevented from being burnt out due to the overlarge energy value of the audio signal received by the power amplification unit, and the protection effect is achieved.
Further, referring to fig. 2, the adjusting method further includes the steps of:
s310, an automatic adjusting unit receives the current frame audio signal processed by the compressing unit;
s311, calculating the frequency spectrum of the current frame audio signal and the energy value of each frequency band by an automatic adjusting unit according to the current frame audio signal, and calculating the frequency spectrum and the energy value of each frequency band by the automatic adjusting unit through fast Fourier transform of 2048 points on the current frame audio signal;
s312, the automatic adjusting unit obtains EQ adjusting parameters according to the energy values of all frequency bands of the current frame audio signal and the gain parameters corresponding to all the frequency bands; the EQ adjusting parameters refer to the frequency spectrum of the current frame audio signal, the energy value of each frequency band and the gain parameter corresponding to each frequency band;
s313, the automatic adjusting unit feeds the EQ adjusting parameters back to the EQ unit, and the EQ unit performs gain processing on the audio signals of the next frame according to the EQ adjusting parameters.
When an audio signal is input, energy shortage or defects exist on a certain frequency spectrum, an automatic adjusting unit is arranged, the insufficient frequency spectrum and the energy value of the frequency spectrum can be automatically detected in real time and fed back to the EQ unit, the EQ unit can conveniently adjust the audio signal of the next frame, and the auditory effect is improved.
Further, referring to fig. 3, the adjusting method further includes the steps of:
s600, a sound pickup picks up audio signals output by a loudspeaker;
s700, an FIR (finite impulse response) calculating unit acquires a first audio signal of an A/D (analog/digital) conversion unit and a second audio signal acquired by a sound pickup, calculates a phase offset parameter according to the first audio signal and the second audio signal and feeds the phase offset parameter back to a phase unit;
and S800, the phase unit performs phase compensation correction on the audio signal of the next frame according to the received phase offset parameter.
Each functional module needs processing time, namely, the signal source input and the final signal output by the loudspeaker have phase deviation, so that the auditory effect is influenced; the sound pick-up, the FIR calculation unit and the phase unit are arranged, so that the phase correction function of the audio system is realized, the phase of the output audio signal is as close as possible to the phase of the input audio signal, and the auditory effect is improved.
Further, in step S313, the EQ unit adjusts the gain G and the quality factor Q of the frequency spectrum of the current frame signal according to the received EQ adjustment parameter, and recalculates the filter coefficient COEFF of the full parameter equalization PEQ; when the audio signal of the next frame is input, the EQ unit adjusts the input audio signal of the next frame using the calculated filter coefficient COEFF.
The expression of the full parameter equalization PEQ is as follows:
wherein S represents a signal value, A represents a pass band gain, and Q represents a quality factor.
The calculation formula of the filter coefficient COEFF is as follows:
a0＝1+alpha/A (2.1)
alpha＝sin(ω0)/(2*Q) (2.2)
a1＝-2*cos(ω0) (2.3)
ω0＝2*pi*f0/Fs (2.4)
a2＝1-alpha/A (2.5)
b0＝(1+alpha*A)*gainLinear (2.6)
gainLinear＝10^(gain/20) (2.7)
b1＝-(2*cos(ω0))*gainLinear (2.8)
b2＝(1-alpha*A)*gainLinear (2.9)
wherein a0, a1, a1, b0, b1 and b2 are all filter coefficients, a is a coefficient on a numerator, b is a coefficient on a denominator, ω 0 is a normalized frequency, alpha is a Q value for sinusoidization, and gainliner represents a stop band linear gain.
Further, in step S700, the FIR unit respectively stores 1024 samples of the first audio signal and the second audio signal, calculates a phase difference between the two samples by a correlation analysis method, and then respectively performs fast fourier transform on the 1024 samples of the first audio signal and the second audio signal to find a main frequency band, where the fast fourier transform is calculated in the following manner:
where Len denotes the number of samples, Len 1024, xiRepresenting a first audio signal, yiRepresenting a second audio signal.
The FIR unit processes the main frequency band by using an FIR filter, calculates to obtain a phase difference offset parameter, the FIR filter obtains the phase offset parameter by using a firwin function, and the calculation method is as follows:
signa].firwin(Order+1，Fs，width＝None，window＝WinNameGet，pass_zero＝False
wherein Order represents the Order of the FIR filter; fs represents a cutoff frequency; window is a Window function and is transmitted from the outside; pas _ zero ═ False, denotes high pass or band pass.
Referring to fig. 4, the present invention further provides an audio system with protection function, including:
the A/D conversion unit is used for receiving the current frame audio signal and converting the current frame audio signal into a digital signal;
the EQ unit is used for receiving the digital signal of the A/D conversion unit and performing gain processing on the current frame audio signal;
the compression unit is used for receiving the current frame audio signal processed by the EQ unit, comparing the energy value of the current frame audio signal with a set energy threshold value and judging whether compression processing is needed or not;
the D/A conversion unit is used for receiving the current frame audio signal processed by the compression unit and converting the current frame audio signal into an analog signal;
and the power amplifier unit is used for receiving the analog signal output by the D/A conversion unit, amplifying the analog signal and driving the loudspeaker to play sound.
Further, referring to fig. 4, the audio system with protection function further includes an automatic adjusting unit, where the automatic adjusting unit is configured to receive the current frame audio signal processed by the compressing unit, calculate energy values of each frequency band according to the current frame audio signal, obtain EQ adjustment parameters according to the energy values of each frequency band and gain parameters corresponding to each frequency band, and feed the EQ adjustment parameters back to the EQ unit.
Further, referring to fig. 5, the audio system with protection function further includes:
the sound pickup is used for acquiring an audio signal output by the loudspeaker;
an FIR calculation unit, configured to obtain a first audio signal picked up by a sound pickup and a second audio signal obtained by an A/D conversion unit, and calculate a phase offset parameter, where the second audio signal is a signal frame of a current frame of audio signal, and the phase offset parameter is used to perform phase compensation correction on a next frame of audio signal;
and the phase unit is used for receiving the phase offset parameter output by the FIR calculation unit and carrying out phase compensation correction on the audio signal of the next frame.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the protective scope of the present invention.
Claims (8)
1. A method of adjusting an audio system having a protection function, comprising the steps of:
s100, converting an input current frame audio signal into a digital signal by an A/D conversion unit;
s200, performing gain processing on the current frame audio signal converted into the digital signal by an EQ unit;
s300, the compression unit receives the current frame audio signal output by the EQ unit, and if the energy of the current frame audio signal is larger than a set compression starting threshold, the compression unit compresses the energy of the current frame audio signal according to a set compression ratio; if the energy of the current frame audio signal is less than or equal to the set compression starting threshold, the compression unit stops working;
s400, converting the current frame audio signal processed by the compression unit into an analog signal by a D/A conversion unit;
and S500, the power amplification unit receives and amplifies the analog signal output by the D/A conversion unit and drives a loudspeaker to play sound.
2. The method for adjusting an audio system with a protection function according to claim 1, further comprising the steps of:
s310, an automatic adjusting unit receives the current frame audio signal processed by the compressing unit;
s311, calculating the frequency spectrum of the current frame audio signal and the energy value of each frequency band by the automatic adjusting unit according to the current frame audio signal;
s312, the automatic adjusting unit obtains EQ adjusting parameters according to the energy values of all frequency bands of the current frame audio signal and the gain parameters corresponding to all the frequency bands;
s313, the automatic adjusting unit feeds the EQ adjusting parameters back to the EQ unit, and the EQ unit performs gain processing on the audio signals of the next frame according to the EQ adjusting parameters.
3. The method for adjusting an audio system with a protection function according to claim 1, further comprising the steps of:
s600, a sound pickup picks up audio signals output by a loudspeaker;
s700, an FIR (finite impulse response) calculating unit acquires a first audio signal of an A/D (analog/digital) conversion unit and a second audio signal acquired by a sound pickup, calculates a phase offset parameter according to the first audio signal and the second audio signal and feeds the phase offset parameter back to a phase unit;
and S800, the phase unit performs phase compensation correction on the audio signal of the next frame according to the received phase offset parameter.
4. The method as claimed in claim 2, wherein in step S313, the EQ unit adjusts the gain G and the quality factor Q of the frequency spectrum of the current frame signal according to the received EQ adjustment parameters, and recalculates the filter coefficient COEFF of the full parameter equalization PEQ; when the audio signal of the next frame is input, the EQ unit adjusts the input audio signal of the next frame using the calculated filter coefficient COEFF.
5. The method of claim 3, wherein in step S700, the FIR unit stores 1024 samples of the first audio signal and the second audio signal, calculates a phase difference therebetween by a correlation analysis method, performs fast Fourier transform on the 1024 samples of the first audio signal and the second audio signal, finds the main frequency band, processes the main frequency band by using an FIR filter, and calculates a phase difference offset parameter.
6. An audio system with protection, comprising:
the A/D conversion unit is used for receiving the current frame audio signal and converting the current frame audio signal into a digital signal;
the EQ unit is used for receiving the digital signal of the A/D conversion unit and performing gain processing on the current frame audio signal;
the compression unit is used for receiving the current frame audio signal processed by the EQ unit, comparing the energy value of the current frame audio signal with a set energy threshold value and judging whether compression processing is needed or not;
the D/A conversion unit is used for receiving the current frame audio signal processed by the compression unit and converting the current frame audio signal into an analog signal;
and the power amplifier unit is used for receiving the analog signal output by the D/A conversion unit, amplifying the analog signal and driving the loudspeaker to play sound.
7. The audio system according to claim 6, further comprising an automatic adjusting unit, wherein the automatic adjusting unit is configured to receive the current frame audio signal processed by the compressing unit, calculate energy values of respective frequency bands according to the current frame audio signal, obtain EQ adjustment parameters according to the energy values of the respective frequency bands and the gain parameters corresponding to the respective frequency bands, and feed the EQ adjustment parameters back to the EQ unit.
8. The audio system with protection function according to claim 6, further comprising:
the sound pickup is used for acquiring an audio signal output by the loudspeaker;
an FIR calculation unit for acquiring the first audio signal picked up by the sound pickup and the second audio signal acquired by the a/D conversion unit and calculating a phase offset parameter;
and the phase unit is used for receiving the phase offset parameter output by the FIR calculation unit and carrying out phase compensation correction on the audio signal of the next frame.
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| CN106713794A (en) * | 2016-11-29 | 2017-05-24 | 青岛海信电器股份有限公司 | Method for adjusting audio equalizing and audio system for providing equalizing adjustment |
| CN109245739A (en) * | 2018-08-28 | 2019-01-18 | 南京中感微电子有限公司 | digital audio equalizer |
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|---|---|---|---|---|
| CN1926920A (en) * | 2004-03-03 | 2007-03-07 | 唯听助听器公司 | Audiphone comprising self-adaptive feedback inhibiting system |
| CN101091209A (en) * | 2005-09-02 | 2007-12-19 | 日本电气株式会社 | Noise suppressing method and apparatus and computer program |
| CN205039809U (en) * | 2015-11-04 | 2016-02-17 | 成都鼎桥通信技术有限公司 | Simulation intercom with audio frequency reinforcing |
| CN106713794A (en) * | 2016-11-29 | 2017-05-24 | 青岛海信电器股份有限公司 | Method for adjusting audio equalizing and audio system for providing equalizing adjustment |
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Application publication date: 20200508 |