CN100530351C - Dynamic range controlled mixing sound input device and method - Google Patents
Dynamic range controlled mixing sound input device and method Download PDFInfo
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- CN100530351C CN100530351C CNB2003101197589A CN200310119758A CN100530351C CN 100530351 C CN100530351 C CN 100530351C CN B2003101197589 A CNB2003101197589 A CN B2003101197589A CN 200310119758 A CN200310119758 A CN 200310119758A CN 100530351 C CN100530351 C CN 100530351C
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Abstract
The invention relates to a mixing sound output device and its method used in dynamic range control. The method is calculating-adjusting gain value, and it includes the following steps that calculating surround sound channel power and center sound channel power; judging whether the gain of the surround and center sound channel is saturation; if it is not, entering the gain step adjusted the dynamic range control; or entering saturation process; doing the gain operation; changing the gain and judging whether the gain value is reached to the given; if the judged result is reached the given gain value, the adjusted gain is gained; or continuously doing gain operation and changing gain step.
Description
Technical field
The present invention relates to a kind of audio mixing output unit and method of dynamic range control, the sound after particularly decompressing, the gain control behind the effective solution audio mixing that is proposed at a digital audio-video code translator.
Background technology
The purpose of family movie institute in simple terms, it is exactly progress along with science and technology, the film of being showed in the cinema can be by video-tape, VCD, DVD ... reappear in the family etc. audio-visual software, therefore convenient with advanced audio-visual equipment, reappear in the family as the effect as the cinema, so this idea of family movie institute that just has been born.
Will reappear the effect as the cinema at home, image and audio are two big crucial; It is meticulous that image partly mainly is that picture will reach greatly, reach, just can be more near the effect of optical projection as the cinema; Partly then depend on excellently in audio recording and high-quality surround sound equipment at audio, that is to say when the software recording progressively more, when family expenses surround sound equipment was good more, audio was partly more near the effect of specialty in the cinema.
So on family's DVD player, often see DTS (Digital Theater sysytems; Digital theater effect system) with Dolby Digital (Dolby Digital; The Dolby Digital audio) these two kinds of audio format technologies, this audio format technology are in order to satisfy in the family cinema around the needs of audio.Wherein Dolby Digital (AC-3) coding specification is formulated by Doby company (Doldy Laboratories), Dolby Digital (Dolby Digital; The Dolby Digital audio) sound adopts is 12 to 1 destructive compress mode storage.Be for audio document needn't take too many storage area, and carrying out also can not taking too many frequency range when numerical data transmits.Dolby Digital (Dolby Digital; When the Dolby Digital audio) specification is compressed data, can give up the details that some human auditories are difficult for discovering, such way is opposite with high pass truth thought (reaching former sound reproducing as far as possible) on the contrary.
And DTS (Digital Theater System) audio coding techniques is dts (Digital TheaterSystems, digitizing theatrical use system) a kind of film multi-channel system of company's release, this coding techniques has adopted atypical thinking viewpoint, solves the problem that voice signal stores.Its employed compression factor only has 3 to 1.Though taked the mode of destructive compression equally, for the regeneration level of sound, surmounted Dolby Digital (Dolby Digital; The Dolby Digital audio).
See also Fig. 1, it is known audio coding audio mixing output synoptic diagram 1, and it comprises a delay circuit unit 10, the accurate bit location 12 of a measurement, a curve controlled unit 14, a gain control unit 16 and an audio mixing unit 18.
No matter be to use above-mentioned which kind of audio coding techniques, all can find aspect coding techniques, need use very complex mathematical computing.For the family expenses audio-visual devices, just need powerful central processing unit (CPU), digital signal processor (DSP) and huge physical memory (Physical Memory) and could handle these complex calculations.Increased the cost of purchase of equipment so undoubtedly.
Summary of the invention
Therefore, for solving above-mentioned existing defective, the present invention proposes a kind of audio mixing output unit and method of dynamic range control.This method is the gain of sound channel sound source to be done the decay of a ratio, do the action of audio mixing again, this simultaneously this sound channel sound source must and take absolute value through a rectifier, the value that institute's rectification is gone out is used for the rated output yield value, the yield value that is calculated as audio mixing after the last gain adjustment value of sound channel sound source.
The concrete technical scheme of this method is as follows:
The audio mixing output intent of dynamic range control of the present invention, it is the method that input signal converts output signal after via audio mixing to, this method comprises the following step:
Ring is around reaching center channel power;
Adjust the gain of dynamic range control;
The computing that gains;
Change the gain of institute's computing;
Judge whether the gain after changing reaches default yield value; And
Obtain gain, promptly obtain a correct yield value.
The present invention also provides a kind of audio mixing output unit of dynamic range control, and it converts an input signal to an output signal after via this device audio mixing, and this device comprises:
One gain reduction unit is that input signal is done ratio decay;
One audio mixing unit is with the signal of this gain reduction unit output audio mixing in addition;
One rectification unit is input signal is done a reverse rectification and to take absolute value;
One rated output gain unit calculates the power gain of the signal of this rectification unit output, obtains a yield value; And
One adjusts gain unit, is the signal that this audio mixing unit is exported is done a ratio adjustment according to the yield value of this rated output gain unit output;
Thus, this input signal will input to this gain reduction unit and this rectification unit simultaneously, the input signal that inputs to this gain reduction unit obtains an output signal and delivers to this adjustment gain unit after via this gain reduction unit and this audio mixing unit, and the input signal that inputs to this rectification unit obtains yield value after passing through this rectification unit and rated output gain unit, this yield value is exported to this adjustment gain unit, according to this yield value this output signal is done to export after the ratio adjustment at last.
Description of drawings
Fig. 1 is known audio coding audio mixing output synoptic diagram;
Fig. 2 is the audio mixing output unit synoptic diagram of dynamic range control of the present invention;
Fig. 3 is the audio mixing output intent process flow diagram of dynamic range control of the present invention;
Fig. 4 A is the gain of the present invention curve map that fades in; And
Fig. 4 B is the gain of the present invention curve map that fades out.
Wherein, description of reference numerals is as follows:
1 known audio coding audio mixing output synoptic diagram
16 gain control units, 18 audio mixing unit
The audio mixing output unit synoptic diagram of 2 dynamic range control
22 audio mixing unit, 20 gain reduction unit, 24 rectification units
26 rated output gain units 28 are adjusted gain unit
Embodiment
Reach technology, means and the effect that described purpose is taked in order further to understand the present invention, see also following about detailed description of the present invention and accompanying drawing, purpose of the present invention, feature and characteristics, go deep into and concrete understanding when getting one thus, yet appended graphic reference and the explanation usefulness of only providing not is to be used for the present invention is limited.
See also Fig. 2, it is the audio mixing output unit synoptic diagram 2 of dynamic range control of the present invention, includes a gain reduction unit 20, an audio mixing unit 22, a rectification unit 24, a rated output gain unit 26 and an adjustment gain unit 28.
After sound channel sound source inputed to this device, at first this device can enter all sources of sound this gain reduction unit 20 and do the decay of ratio ground, the source of sound after the decay is entered this audio mixing unit 22 carry out the action of audio mixing.Again this simultaneously this sound channel sound source also can enter the action that this rectification unit 24 carries out reverse rectification and takes absolute value, source of sound after the rectification is delivered to this rated output gain unit 26 carry out Calculation of Gain, this device can together be delivered to this adjustment gain unit 28 with source of sound behind the audio mixing and the gain that calculates, and the adjustment and the adjusted sound source of sound that will gain that carry out the gain of sound channel sound source export the external loudspeaker (not shown) to.
Utilize said apparatus can effectively carry out audio mixing output gain control, and make comparisons with prior art and can find that this device can simplify complicated circuit, so can reach and reduce the effect that purchase cost reaches identical gain control again equally.
Please consult Fig. 3, it is the audio mixing output intent process flow diagram of dynamic range control of the present invention, please cooperates simultaneously with reference to figure 2 at this to contrast mutually.This method is the program circuit step in the digital signal processor (DSP), this program at the beginning (being step S100) first ring around and center channel power (being step S102), judgement around and center channel whether saturated (being step S104), if do not have saturatedly then to continue next step, otherwise enter this saturated processing (being step S106).Above-mentioned action is the action of gain reduction unit 20 and the audio mixing unit 22 of Fig. 2.
Adjust the gain (being step S108) of dynamic range control (DRC), this action is the action of the rectification unit 24 of Fig. 2.The computing that gains (being step S110), this action is the action of the rated output gain unit 26 of Fig. 2.Change gain (being step S112), judge whether to reach the yield value (being step S114) of design in advance, this action is the action of the adjustment gain unit 28 of Fig. 2, and this yield value that designs in advance is the default yield value of program, yield value that should be default is minimum to be 1, is up to 2.Program is when carrying out this judgement, and its program inside is provided with a test chart (Look-Up Table) and does real-time judgement.
When the yield value of judging during less than the yield value of minimum predetermined, the gain that is obtained is 1.When the yield value of being judged during between yield value that the yield value and the maximum prefetch of minimum predetermined are established, the gain that is obtained is for less than 1.When yield value that the yield value of being judged is established greater than maximum prefetch, the gain that is obtained is 2.
In this increase or reduce in the process of gain, be not to increase rapidly or reduce rapidly but increase very smoothly, just, increase gain at leisure or reduce gain to fade in (fade-in) and the mode (seeing also Fig. 4 A and Fig. 4 B) of fade out (fade-out).Because be to increase or reduce gain in this way, so do not have the generation of unsweet sound phenomenon.
Then carry out next step if the yield value of being judged has reached,, then get back to this calculation step that gains (being step S110) and rerun if the yield value of being judged does not reach as yet.So can obtain the yield value (being step S116) of this adjustment.And finish this program (being step S118).
Wherein, surround channel can be a left surround channel and a right surround channel in the above-described embodiments.
In sum, by method proposed by the invention, can effectively carry out the control of audio mixing output gain, operand is not too large again, and can not use division arithmetic.So in practical application, can't need to increase the ability of internal memory or reinforcement central processing unit (CPU) or digital signal processor (DSP), so can reach and reduce the effect that purchase cost reaches identical gain control again equally because of the intricately operand.The present invention provides a kind of far different in known design by the technology of above-mentioned announcement, can improve whole use value.
In addition; above-mentioned graphic, the explanation that discloses; only be embodiments of the invention, can carry out other various improvement according to above-mentioned explanation for those of ordinary skill in the art, these changes must belong to the scope of inventive concept of the present invention and claim of the present invention protection.
Claims (9)
1. the audio mixing output unit of a dynamic range control, it converts input signal to output signal after via this device audio mixing, and this device comprises:
One gain reduction unit is that this input signal is done ratio decay;
One audio mixing unit is with the signal of this gain reduction unit output audio mixing in addition;
One rectification unit is this input signal is done a reverse rectification and to take absolute value;
One rated output gain unit calculates the power gain of the signal of this rectification unit output, obtains a yield value; And
One adjusts gain unit, is the signal that this audio mixing unit is exported is done a ratio adjustment according to this yield value of this rated output gain unit output;
Thus, this input signal will input to this gain reduction unit and this rectification unit simultaneously, this input signal that inputs to this gain reduction unit obtains an output signal and delivers to this adjustment gain unit after via this gain reduction unit and this audio mixing unit, and this input signal that inputs to this rectification unit obtains this yield value after passing through this rectification unit and this rated output gain unit, this yield value is exported to this adjustment gain unit, according to this yield value this output signal is done to export after the ratio adjustment at last.
2. the audio mixing output intent of a dynamic range control, it is the method that an input signal is converted to an output signal after via audio mixing, this method comprises the following step:
Ring is around reaching center channel power;
Adjust the gain of dynamic range control;
The computing that gains;
Change the gain of institute's computing;
Judge whether the gain after changing reaches default yield value; And
Obtain gain, promptly obtain a correct yield value.
3. the audio mixing output intent of dynamic range control as claimed in claim 2 is characterized in that, this ring this surround channel in reaching center channel power step is a left surround channel and a right surround channel.
4. the audio mixing output intent of dynamic range control as claimed in claim 2 is characterized in that, this ring around and center channel power step in also comprise one judge around and the whether saturated step of center channel.
5. the audio mixing output intent of dynamic range control as claimed in claim 4, it is characterized in that, whether saturated step is to judge whether left surround channel, right surround channel and center channel be saturated around reaching center channel in this judgement, if the judgment is No, then continue next procedure, otherwise enter saturated processing.
6. the audio mixing output intent of dynamic range control as claimed in claim 2 is characterized in that, the gain step of this adjustment dynamic range control is this input signal to be done one oppositely take absolute value again.
7. the audio mixing output intent of dynamic range control as claimed in claim 2 is characterized in that,
The gain step that changes institute's computing be with a gain control fade in and the mode of fading out increases this yield value or reduces this yield value.
8. the audio mixing output intent of dynamic range control as claimed in claim 7 is characterized in that, in this yield value step that judges whether to reach default, if the result who is judged then continues next procedure, otherwise gets back to the calculation step that this gains for being.
9. the audio mixing output intent of dynamic range control as claimed in claim 7 is characterized in that, this default yield value is minimum to be 1, is up to 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101197589A CN100530351C (en) | 2003-12-03 | 2003-12-03 | Dynamic range controlled mixing sound input device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101197589A CN100530351C (en) | 2003-12-03 | 2003-12-03 | Dynamic range controlled mixing sound input device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1624759A CN1624759A (en) | 2005-06-08 |
| CN100530351C true CN100530351C (en) | 2009-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2003101197589A Expired - Fee Related CN100530351C (en) | 2003-12-03 | 2003-12-03 | Dynamic range controlled mixing sound input device and method |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI517562B (en) * | 2006-04-04 | 2016-01-11 | 杜比實驗室特許公司 | Method, apparatus, and computer program for scaling the overall perceived loudness of a multichannel audio signal by a desired amount |
| CA2988540A1 (en) | 2014-08-01 | 2016-02-04 | Steven Jay Borne | Audio device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4864627A (en) * | 1986-11-07 | 1989-09-05 | Dugan Daniel W | Microphone mixer with gain limiting and proportional limiting |
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2003
- 2003-12-03 CN CNB2003101197589A patent/CN100530351C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4864627A (en) * | 1986-11-07 | 1989-09-05 | Dugan Daniel W | Microphone mixer with gain limiting and proportional limiting |
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