CN102195581A - Method for adjusting volume of digital audio signal - Google Patents
Method for adjusting volume of digital audio signal Download PDFInfo
- Publication number
- CN102195581A CN102195581A CN2010101448163A CN201010144816A CN102195581A CN 102195581 A CN102195581 A CN 102195581A CN 2010101448163 A CN2010101448163 A CN 2010101448163A CN 201010144816 A CN201010144816 A CN 201010144816A CN 102195581 A CN102195581 A CN 102195581A
- Authority
- CN
- China
- Prior art keywords
- audio
- level
- input signal
- audio input
- digital audio
- 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.)
- Pending
Links
Images
Landscapes
- Circuit For Audible Band Transducer (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
The invention discloses a method for adjusting a volume of a digital audio signal. The method comprises the following steps of: detecting a level according to an audio input signal; determining a gain value according to the detected level; and outputting an audio output signal according to the gain value and the audio input signal. According to the invention, a weak audio frequency signal (such as background noise) is suppressed during mute so as to reduce the interference to the human auditory sense.
Description
Technical field
The invention relates to the method for regulation of sound volume of audio signal, particularly about the method for regulation of sound volume of the more weak audio signal of peak value or energy level, to reduce the background noise in the multimedia system.
Background technology
Fig. 1 shows the plane graph of traditional multimedia audio treatment system.As shown in Figure 1, traditional multimedia audio treatment system 10 comprises tuner 102, a plurality of analog-to-digital converter (analog todigital convener, hereinafter to be referred as ADC) 104, demodulator 106 (SIF sound intermediate frequency (sound If for example, SIF) analog input 108 demodulator),, numeral input 110, decoder 112, digital audio signal processing apparatus 114, digital revolving die are intended transducer (digital to analog convener is hereinafter to be referred as DAC) 116 and numeral output 118.The source of audio frequency input can be obtained from tuner 102, analog input 108 or numeral input 110.The audio frequency of being imported by tuner 102 and analog input 108 is input as analog audio source, and can do the conversion of analog-to-digital by means of ADC 104.After digitlization, the audio-source that tuner 102 is imported is further done demodulation by means of demodulator 106., before transferring to digital audio processing device 114, need by numeral input 110 audio frequency of being imported its decoding.Digital audio signal processing apparatus 114 can be handled the audio frequency input of being imported by tuner 102, analog input 108 and/or numeral input 110.At last, audio signal will transfer to DAC 116 or numeral output 118 by digital audio signal processing apparatus 114.
Yet analog signal is vulnerable to interference of noise during transmitting and handling, and (signal noise ratio SNR) descends and cause signal noise ratio.And people's ear can't be perceived the existence of background noise when music or sound playing are arranged.But when music or sound stop to play, then people's ear just is easy to discover the existence of background noise.
In view of this, the present invention proposes a kind of system can be when normal audio reduces, and judges whether to background noise and adjusts sound, to reduce the noise jamming of people's ear.
Summary of the invention
One of purpose of the embodiment of the invention is to provide a kind of digital audio and video signals treatment system and method, in order to the audio signal that suppresses to originate with the very weak audio frequency that lowers the volume, to reduce the interference of background noise to the multimedia audio system.
According to above-mentioned purpose, digital audio signal processing apparatus comprise according to audio input signal with the level detector that detects level, according to the level that detects with the gain table of decision yield value and according to yield value and audio input signal gain controller with the output audio output signal.
According to above-mentioned purpose, the method for regulation of sound volume of digital audio and video signals comprises according to audio input signal, detects level; According to detecting level, the decision yield value; And according to yield value and audio input signal, the output audio output signal.
Description of drawings
The plane graph of Fig. 1 is to show a traditional audio signal processing.
The calcspar of Fig. 2 is to show according to a digital audio signal processing apparatus of the present invention.
The graph of a relation of Fig. 3 is the relation that shows the detection level of yield value and audio input signal.
The flow chart of Fig. 4 is the acoustic signal processing method that shows according to one embodiment of the invention.
The flow chart of Fig. 5 is the acoustic signal processing method that shows according to another embodiment of the present invention.
[main element symbol description]
10 traditional audio frequency processing systems
102 tuners
104 analog-to-digital converters
106 demodulators
108 analog inputs
110 numeral inputs
112 decoders
114 digital audio signal processing apparatus
116 digital revolving dies are intended transducer
118 numeral outputs
20 digital audio signal processing apparatus
202 filters
204 peak level detectors
206 gain table
208 gain controllers
The 402-410 step
The 502-514 step
Thd0～thd4 level
Embodiment
The calcspar of Fig. 2 shows the digital audio signal processing apparatus according to one embodiment of the invention.As shown in Figure 2, digital audio signal processing apparatus 20 comprises filter 202, peak level detector 204, gain table 206 and gain controller 208.When digital audio signal processing apparatus 20 received audio input signal, filter 202 was with the part of filtering high frequency, and this is because people's ear is more insensitive to the sound that frequency exceeds 20KHz.According to a preferred embodiment, filter 202 can be low pass filter or band pass filter.Next, the audio input signal that filters is transferred to peak level detector 204, to detect the peak value of the audio input signal that filters.According to the peak level that is detected by peak level detector 206, digital audio signal processing apparatus 20 can be consulted gain table, with the decision yield value.According to yield value and audio input signal, gain controller 208 is with exportable audio output signal then.In a preferred embodiment, audio output signal is the product that audio input signal is multiplied by yield value.
The present invention has an embodiment in addition, the digital audio processing device that it adopted, except the peak level detector with the digital audio processing device 20 of Fig. 2 replaces with the energy level detector, all the other frameworks are all identical with digital audio processing device 20, and the yield value that gain table provided that is adopted can be corresponding to the energy level of the audio input signal that filters.Next, the digital audio signal processing apparatus of present embodiment can be consulted above-mentioned gain table according to the detected energy level of energy level detector, with the decision yield value.In other embodiments, the present invention also can adopt the digital audio signal processing apparatus similar in appearance to framework shown in Figure 2, but is its audio output signal with the product that is multiplied each other by audio signal (non-original audio input signal) that filter was filtered and yield value.
Fig. 3 is the graph of a relation of the detection peak of yield value and audio input signal.As shown in Figure 3, in a preferred embodiment, can be by means of five different level (thd0～thd4), the detection peak of audio input signal is divided into six intervals.Basically, the gain controller of curve display digital audio signal processing apparatus of the present invention shown in Figure 3 can suppress the lower signal of peak level.Illustrative embodiments shown in Figure 3 has shown that for the audio signal of detection peak level between thd0 and thd4, its detected level is lower, and the repressed degree of signal is bigger.As shown in Figure 3, for this example, detect the peak level that level is lower than the detection signal of thd4, its gain is a predetermined least restrictive yield value ,-18dB.Be noted that, in different embodiment, the detection peak level can be divided into according to the needs of different embodiment and be less than or more than five intervals.And further, for adopting the energy level detector among the present invention but not for the digital audio signal processing apparatus of peak detector, curve chart shown in Figure 3 can be represented the relation of yield value and detected energy level in this type of embodiment.
The flow chart of Fig. 4 shows according to digital analogue signal processing method of the present invention.As shown in Figure 4, digital analogue signal treatment system of the present invention receives audio input signal in step 402.Audio input signal can be the analog or digital signal, or is used for the dissimilar standard signal of different system.In step 404, in order in follow-up process, to obtain preferable result, audio input signal is filtered in advance, for example be the part of the high frequency of filtering audio input signal in this embodiment.In step 406, detect the peak level of the audio signal that filters.In step 408, according to the detection peak level, decision yield value: wherein determine one of method of yield value, can be with reference to gain table corresponding to the detection peak level.In step 410, according to yield value and audio input signal, the audio output signal after the volume is adjusted in output.For instance, audio output signal can produce by means of in gain controller yield value being multiplied by audio input signal.Because yield value is an inhibiting value (for example being a value less than unit gain), so the value of audio output signal will reduce.Be lower than the audio input signal of predetermined critical for peak detection values, design of the present invention is to lower corresponding yield value as far as possible, to lower the audio output signal volume or even to reach quiet.
The present invention can adopt the different practices in step 406 in other embodiments, and energy level that for example can audio input signal replaces its peak level as detected object.In this type of embodiment, step 408 can correspondingly change into according to the detected energy level, with the decision yield value.At some among other the embodiment, step 410 can be changed into output is multiplied by the audio input signal (being produced by step 404) of filtration by yield value product in addition.
Yield value among the present invention can continue weak time length according to Audio Meter in addition and decide.This operation will be adopted state value.The flow chart of Fig. 5 shows acoustic signal processing method according to another embodiment of the present invention.As shown in Figure 5, in step 502 the initial condition value is made as 0 (state=0), does not suppress the volume of audio output signal, the promptly corresponding yield value of meaning is a unit gain.In step 504,, detect the peak level or the energy level of audio input signal according to different designs.If detect level greater than initial condition critical level (thd0), then state value is maintained 0 and rebound step 502, carries out the next observation cycle again.If detect level not greater than initial condition critical level (thd0), then execution in step 508.In step 508, will further detect level and whether be lower than the current state critical level.If detect level less than the current state critical level, then execution in step 512; Otherwise then execution in step 510.In step 512, before state value surpasses the predetermined upper limit, state value will constantly add one and according to the yield value of state value setting audio signal.Next, rebound step 504 is to carry out the next observation cycle.In step 508, whether detection signal is lower than the current state critical level.In step 510, then further detect level and whether be higher than the preceding state critical level.Therefore, if detected level is not higher than the preceding state critical level, then flow process rebound step 504 to be carrying out the next observation cycle, and sets yield value according to the current state value; Be higher than previous critical level if detect level, then in step 514 state value subtracted one, expression detects level (no matter peak level or energy level (volume level)) in increase constantly this moment.In addition, if state value reaches the upper limit, and detect level and be lower than the corresponding critical level of current state (upper limit state), then will keep identical state value in step 512, because can know very faint of audio signal this moment by inference, this expresses possibility and is the background noise during quiet, and therefore the gain value settings with correspondence is predetermined minimum definite value, to reduce the volume of audio output signal.
Please continue with reference to figure 5.In step 506,, can judge that just audio input signal is not in the quiet phase when the level of perceiving detection is higher than initial condition critical level (thd0).And, will gain to establish back to unit gain and the audio output signal volume not suppressed or reduce in step 502.
Generally speaking, the invention provides a kind of effective Audio Signal Processing, during quiet, suppress and the volume (because of it may be background noise) that reduces small-signal.The present invention decides yield value (inhibiting value) according to the peak level or the energy level of detected audio input signal in certain embodiments; And in other embodiment, how long then continue to be positioned at the low level time with reference to detected level has, with the decision yield value.
The above is the preferred embodiments of the present invention only, is not in order to limit claim of the present invention; All other do not break away from equivalence change or the modification that the disclosed spirit of invention is finished, and all should be included in the claims.
Claims (20)
1. digital audio signal processing apparatus comprises:
One level detector is in order to detect the level of an audio input signal;
One gain table, it is to determine a yield value according to this detected level; And
One gain controller, it is according to this yield value and this audio input signal, exports an audio output signal.
2. digital audio signal processing apparatus as claimed in claim 1, wherein this level detector is a peak level detector, it is used to detect a peak level of this audio input signal, and this gain table is to determine a yield value according to this detected peak level.
3. digital audio signal processing apparatus as claimed in claim 1, wherein this level detector is an energy level detector, it is used to detect an energy level of this audio input signal, and this gain table is to determine a yield value according to this detected energy level.
4. digital audio signal processing apparatus as claimed in claim 1, it also comprises:
One filter in order to filtering this audio input signal, and is exported an audio input signal that filters, and wherein this level detector is the audio input signal that is used to detect this filtration.
5. digital audio signal processing apparatus as claimed in claim 4, wherein this filter is a low pass filter.
6. digital audio signal processing apparatus as claimed in claim 1, wherein this audio output signal is multiplied by the product of this audio input signal for this yield value.
7. digital audio signal processing apparatus as claimed in claim 1, wherein this digital audio signal processing apparatus is to be applied to a multimedia system.
8. digital audio signal processing apparatus as claimed in claim 7 wherein when the level of this audio input signal is lower than a predetermined critical, uses this gain controller to suppress this audio output signal.
9. digital audio signal processing apparatus as claimed in claim 7, wherein when this audio input signal was lower than a predetermined critical, it was quiet using this gain controller to make this audio output signal.
10. method for regulation of sound volume that is used for digital audio and video signals comprises:
Detect the level of an audio input signal;
Determine a yield value according to this detected level; And
According to this yield value and this audio input signal, export an audio output signal.
11. the method for regulation of sound volume that is used for digital audio and video signals as claimed in claim 10, the step that wherein detects the level of an audio input signal comprises the peak level that detects this audio input signal, and determines the step of a yield value to comprise that this detected peak level of basis determines a yield value according to this detected level.
12. the method for regulation of sound volume that is used for digital audio and video signals as claimed in claim 10, the step that wherein detects the level of an audio input signal comprises the energy level that detects this audio input signal, and determines the step of a yield value to comprise that this detected energy level of basis determines a yield value according to this detected level.
13. the method for regulation of sound volume that is used for digital audio and video signals as claimed in claim 10, it also comprises:
Filter this audio input signal by means of a filter, to reduce the noise of this audio input signal.
14. the method for regulation of sound volume that is used for digital audio and video signals as claimed in claim 10 wherein comprises that according to the step that this yield value and this audio input signal are exported an audio output signal output is multiplied by this audio input signal the product of this yield value.
15. the method for regulation of sound volume that is used for digital audio and video signals as claimed in claim 14, wherein when the level of this audio input signal was lower than a predetermined critical, this yield value was that an inhibiting value is to suppress the volume of this audio output signal.
16. the method for regulation of sound volume that is used for digital audio and video signals as claimed in claim 14, wherein when this Audio Meter was lower than a predetermined critical, this yield value was that an inhibiting value is so that this audio output signal is quiet.
17. being each predetermined periods in a plurality of predetermined periods, the method for regulation of sound volume that is used for digital audio and video signals as claimed in claim 10, the step that wherein detects the level of an audio input signal carry out; This method also comprises:
Adjust a state value according to this detected level;
Wherein determine the step of a yield value, also comprise:
According to this state value of this audio input signal, to determine a yield value.
18. the method for regulation of sound volume that is used for digital audio and video signals as claimed in claim 17, the step of wherein adjusting a state value comprises when this detection level is lower than a critical value, increases by a state value.
19. the method for regulation of sound volume that is used for digital audio and video signals as claimed in claim 17, wherein a high state value is corresponding to a low gain value.
20. the method for regulation of sound volume that is used for digital audio and video signals as claimed in claim 17 is wherein worked as this detection level and is higher than this predetermined value, then this state value is set to 0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101448163A CN102195581A (en) | 2010-03-18 | 2010-03-18 | Method for adjusting volume of digital audio signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101448163A CN102195581A (en) | 2010-03-18 | 2010-03-18 | Method for adjusting volume of digital audio signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102195581A true CN102195581A (en) | 2011-09-21 |
Family
ID=44603082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101448163A Pending CN102195581A (en) | 2010-03-18 | 2010-03-18 | Method for adjusting volume of digital audio signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102195581A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104079247A (en) * | 2013-03-26 | 2014-10-01 | 杜比实验室特许公司 | Equalizer controller and control method |
| CN104346129A (en) * | 2013-08-08 | 2015-02-11 | 联想(北京)有限公司 | Information output method and electronic equipment |
| CN104471855A (en) * | 2012-07-12 | 2015-03-25 | Dts公司 | Loudness control with noise detection and loudness drop detection |
| CN105074822A (en) * | 2013-03-26 | 2015-11-18 | 杜比实验室特许公司 | Device and method for audio classification and audio processing |
| CN106507245A (en) * | 2016-12-26 | 2017-03-15 | 深圳Tcl数字技术有限公司 | Method for regulating audio signal and device |
| WO2017215657A1 (en) * | 2016-06-16 | 2017-12-21 | 广东欧珀移动通信有限公司 | Sound effect processing method, and terminal device |
| CN107507618A (en) * | 2017-07-18 | 2017-12-22 | 北京小鱼在家科技有限公司 | The voice digital signal auto gain control method of non-linear distortion can be prevented |
| CN108183761A (en) * | 2018-01-19 | 2018-06-19 | 杭州众传数字设备有限公司 | A kind of digital audio audiomonitor |
| CN114650485A (en) * | 2020-12-18 | 2022-06-21 | 广西三诺数字科技有限公司 | Signal transmission method and device, computer equipment and storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0427207A (en) * | 1990-05-22 | 1992-01-30 | Sharp Corp | Audio signal processing circuit |
| JPH10284964A (en) * | 1997-01-09 | 1998-10-23 | Sony Corp | Sound volume adjusting device |
| CN1879150A (en) * | 2003-11-14 | 2006-12-13 | 皇家飞利浦电子股份有限公司 | System and method for audio signal processing |
| CN101370056A (en) * | 2007-08-17 | 2009-02-18 | 上海杰得微电子有限公司 | Digital audio automatic gain control method and its system |
-
2010
- 2010-03-18 CN CN2010101448163A patent/CN102195581A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0427207A (en) * | 1990-05-22 | 1992-01-30 | Sharp Corp | Audio signal processing circuit |
| JPH10284964A (en) * | 1997-01-09 | 1998-10-23 | Sony Corp | Sound volume adjusting device |
| CN1879150A (en) * | 2003-11-14 | 2006-12-13 | 皇家飞利浦电子股份有限公司 | System and method for audio signal processing |
| CN101370056A (en) * | 2007-08-17 | 2009-02-18 | 上海杰得微电子有限公司 | Digital audio automatic gain control method and its system |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104471855A (en) * | 2012-07-12 | 2015-03-25 | Dts公司 | Loudness control with noise detection and loudness drop detection |
| US9685921B2 (en) | 2012-07-12 | 2017-06-20 | Dts, Inc. | Loudness control with noise detection and loudness drop detection |
| US10044337B2 (en) | 2013-03-26 | 2018-08-07 | Dolby Laboratories Licensing Corporation | Equalizer controller and controlling method |
| CN105074822A (en) * | 2013-03-26 | 2015-11-18 | 杜比实验室特许公司 | Device and method for audio classification and audio processing |
| US10803879B2 (en) | 2013-03-26 | 2020-10-13 | Dolby Laboratories Licensing Corporation | Apparatuses and methods for audio classifying and processing |
| CN104079247A (en) * | 2013-03-26 | 2014-10-01 | 杜比实验室特许公司 | Equalizer controller and control method |
| CN105074822B (en) * | 2013-03-26 | 2019-11-12 | 杜比实验室特许公司 | Device and method for audio classification and processing |
| CN104079247B (en) * | 2013-03-26 | 2018-02-09 | 杜比实验室特许公司 | Balanced device controller and control method and audio reproducing system |
| CN104346129A (en) * | 2013-08-08 | 2015-02-11 | 联想(北京)有限公司 | Information output method and electronic equipment |
| CN104346129B (en) * | 2013-08-08 | 2019-04-23 | 联想(北京)有限公司 | A kind of information output method and electronic equipment |
| WO2017215657A1 (en) * | 2016-06-16 | 2017-12-21 | 广东欧珀移动通信有限公司 | Sound effect processing method, and terminal device |
| CN106507245A (en) * | 2016-12-26 | 2017-03-15 | 深圳Tcl数字技术有限公司 | Method for regulating audio signal and device |
| CN107507618A (en) * | 2017-07-18 | 2017-12-22 | 北京小鱼在家科技有限公司 | The voice digital signal auto gain control method of non-linear distortion can be prevented |
| CN108183761A (en) * | 2018-01-19 | 2018-06-19 | 杭州众传数字设备有限公司 | A kind of digital audio audiomonitor |
| CN114650485A (en) * | 2020-12-18 | 2022-06-21 | 广西三诺数字科技有限公司 | Signal transmission method and device, computer equipment and storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102195581A (en) | Method for adjusting volume of digital audio signal | |
| US8510106B2 (en) | Method of eliminating background noise and a device using the same | |
| US9071268B1 (en) | Multi-path analog front end and analog-to-digital converter for a signal processing system | |
| CN101599747B (en) | Volume control apparatus and method | |
| WO2017116629A1 (en) | Multi-path analog front end and analog-to-digital converter for a signal processing system with low-pass filter between paths | |
| US10020003B2 (en) | Voice signal processing apparatus and voice signal processing method | |
| EP1665524A4 (en) | Dynamic bass boost apparatus and method | |
| WO2014016682A3 (en) | Highly-spectrally-efficient receiver | |
| CN101843115B (en) | Auditory sensibility correction device | |
| WO2012024144A9 (en) | Method and system for controlling distortion in a critical frequency band of an audio signal | |
| WO2001019130A3 (en) | Audio signal processing | |
| EP4064570A1 (en) | Multi-path analog front end with adaptive path | |
| EP4044438A1 (en) | Multi-path digitation based on input signal fidelity and output requirements | |
| US20170287480A1 (en) | Voice wake-up method and device | |
| CN105900335B (en) | Audio compression system for compressed audio signal | |
| CN107277683B (en) | Audio amplification system and method | |
| WO2011012054A1 (en) | Method and device for eliminating background noise | |
| JP4458968B2 (en) | Automatic level adjustment circuit | |
| CN103812462B (en) | Volume control method and device | |
| CN103796136A (en) | Equipment and method for ensuring output loudness and tone quality of different sound effect modes | |
| US20110184540A1 (en) | Volume adjusting method for digital audio signal | |
| JP2011199825A (en) | Broadcast receiving apparatus and method of detecting noise component of the broadcast receiving apparatus | |
| CN101714855A (en) | System and method for automatically adjusting volume | |
| US10109293B2 (en) | Voice signal processing apparatus and voice signal processing method | |
| EP2278580A3 (en) | Pitch detection apparatus and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110921 |