CN1244084A - Device and method for simulating multi-channel signals - Google Patents
Device and method for simulating multi-channel signals Download PDFInfo
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- CN1244084A CN1244084A CN 98116835 CN98116835A CN1244084A CN 1244084 A CN1244084 A CN 1244084A CN 98116835 CN98116835 CN 98116835 CN 98116835 A CN98116835 A CN 98116835A CN 1244084 A CN1244084 A CN 1244084A
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Abstract
A device for simulating multi-channel signals is composed of an input buffer, a memory, a signal processor coupled to outputs of input buffer and memory for inputting audio signals and stored coefficient to do revolving integration, an output buffer coupled to output of signal processor, and a controller coupled to input buffer, memory, signal processor and output buffer. Its simulating method includes inputting audio signals to an input buffer, storing coefficient related to head in memory, and revolving integration to said audio signals and coefficient output from input buffer and memory.
Description
The present invention relates to the analogue means and the method for a kind of signal processor and method, particularly a kind of multi-channel signal.
(Digital Versatile Disk, DVD), image and sound quality all surpass VCD and LD to the multifunctional digital dish, so the digitlization high quality film enters into family gradually.Generally speaking, the AC-3 numeral sound source compression standard that DVD adopted must have a left side, the right side, middle, a left side is around (Left Surround), and is right around (Right Surround), supper bass six sound source channels such as (LowFrequency Effects), so need to make relative output equipment with six loud speakers, wherein the putting position of subwoofer can be random, is 5.1 or 5+1 with numeral, and need not 6.Yet general PC or home audio because of the restriction in space, only are equipped with two loud speakers, can't experience the high quality sound of six sound source channels.Add a cover stereo set, real excess waste again again in addition again if think enjoy high quality sound.
Main purpose of the present invention is to provide a kind of acoustical signal analogue means and method of using an a pair of loud speaker or a set of headphones can simulate the Presence of multichannel.Cardinal principle is to adopt 3D auditory localization technology, produces several virtual sound sources (being each loud speaker of multi-channel system) in the space, is called virtual speaker, so can simulate the multichannel effect.As for the principle of 3D auditory localization, be the physical system that the sound source of certain direction in the space is imported people left and right sides ear, describe with a mathematical model, be called human body head related transfer function HRTF (headrelated transfer function).Sound-source signal and HRTF are done to play back via an a pair of loud speaker or a set of headphones after convolution integration (convolution) computing again, can produce the effect of sound from all directions.Because the sound source of diverse location institute corresponding transfer function (HRTF) parameter is all different, thus the transfer function (HRTF) of many group different directions in memory, must be deposited, to produce the virtual speaker of each different directions.
A further object of the present invention is to use 3D auditory localization technology and utilizes two loud speakers to simulate the method for similar 5.1 loud speaker effects to provide a kind of.
For achieving the above object, the present invention adopts 3D auditory localization technology, goes out the effect of similar 5.1 sound sources by two loud speaker direct modelings, and this technology is implemented with hardware, in build among the general digital dish DVD, so applicable to household electrical appliances or PC.
It is as follows to the detailed description of the invention to reach embodiment in conjunction with the accompanying drawings:
Description of drawings:
Fig. 1 is the schematic diagram of multichannel analogue means of the present invention;
Fig. 2 is the method flow diagram of multiple sound channel signals analogue means of the present invention;
Fig. 3 utilizes 3D auditory localization technology to make the schematic diagram that sound source is handled;
Fig. 4 is the circuit block diagram of multichannel auditory localization analogue means of the present invention.
Please refer to Fig. 1, Fig. 1 is a multichannel analogue means of the present invention.At first being decoded by AC-3 decoder (1) once the audio signal of AC standard code becomes six audio signals, that is L channel, R channel, intermediate channel, left surround channel, right surround channel and supper bass sound channel.These six audio signals through decoding are delivered to 3D auditory localization to AC-3 simulator (2) again to carry out signal processing, and six signals are positioned at respectively on its due orientation.For example, the intermediate channel in six sound source channels of script is positioned at the hearer dead ahead, and L channel is positioned at left front etc.Deng the whole audio mixing again behind the location of six sound source channels, broadcast by a pair of loud speaker or earphone at last, and the sense of direction of coming personally that could form the loud speaker that six different azimuth should be arranged originally, reproduction is come out.Wherein 3D auditory localization technology is with human body head related transfer function HRTF (Head Related Transfer Function), with an auditory localization, just sound source be treated as have people's ear be used for differentiating time difference (Interaural Time Difference) between two ears in orientation and the intensity difference (Interaural Intensity Difference) between two ears about two sound channels, import our ear again into earphone or loud speaker, people's ear is sounded takeing for this sound is that a certain orientation transmits from the space, more can add Doppler effect in addition, reflection, mix noon, eliminate interactive interference etc., and reach real solid space effect.
As shown in Figure 2, be illustrated implementing the required step of method of the present invention: at first, carry out step 21,5+1 loud speaker divides other relative position vector in calculating hearer and the AC-3 specification, to obtain the position of each sound source (loud speaker) in the multi-channel system.Because output sound source (loud speaker) configuration mode that different multi-channel systems is had nothing in common with each other, the purpose of this step is by the selected different multi-channel system of user, with the position of each sound source (loud speaker) in the initialization system.Then carry out step 22, pick up required head related transfer function (Head Related Transfer Function, HRTF) coefficient according to above-mentioned position vector.Continue each sound source position of last step gained of this step is obtained corresponding HRTF coefficient in memory.Carry out step 23 then, read the sound source data of six sound channels of AC-3 of input.Carry out HRTF 3D calculation step then, according to each sound source data that reads in, and corresponding HRTF parameter does 3D computing (convolution integration), in the hope of its left and right sides output signal.The schematic diagram handled of the HRTF 3D of sound source wherein, as shown in Figure 3, h (0) wherein, h (1) ... h (N-1) is the HRTF coefficient, and Z-1 postpones (unittime delay) at the unit interval.Judge whether to use loud speaker 25 then.Because the interactive interference phenomenon is just arranged when having only the loud speaker of use, whether this step is differentiated the step of whether using loud speaker to continue with decision will carry out interactive interference elimination computing.Eliminate calculation step 26 to eliminate left and right sides loud speaker interactive interference phenomenon if use loud speaker then to carry out interactive interference.Result after the last instant output 3D localization process with the left and right sides output signal by a pair of loud speaker or earphone, fictionalizes the position of each sound source (loud speaker) in the multi-channel system of the required 5+1 of an AC-3 loud speaker to a pair of loud speaker or earphone.
Please refer to Fig. 4, mat one embodiment illustrates analogue means of the present invention.Audio signal through the AC-3 coding is reduced into six sound channels in 1 decoding of process AC-3 decoder, after deliver to analogue means of the present invention to carry out signal processing, wherein the audio signal of six sound channels is by providing control signal to send control signal and deliver to an input buffer 43 with control and the controller 42 of coordinating the running of whole device, because the locating effect of supper bass sound channel signal is not very significantly to be experienced by people's ear, therefore, the supper bass sound channel signal also can be sent into input buffer 43 to carry out follow-up signal processing, but after the audio signal of all the other five sound channels is carried out signal processing, synthetic with it again, to deliver to output device (loud speaker or earphone).The audio signal of delivering to five sound channels of input buffer 43 is sent to first signal processor 54 of being made up of first multiplier 46 and first adder 48.One stores the memory 41 of many group HRTF coefficients and interactive interference elimination filter coefficient.Also one group of HRTF coefficient that stores in advance can be delivered to first buffer 44, and then deliver to first signal processor 54.First multiplier 46 comprises a plurality of parallel multipliers with multi-channel signal and HRTF multiplication that will input, then multiplied result is delivered to include a plurality of parallel first adders 48 that reach serial adder and carry out sum operation.That is the computing that first signal processor (54) is done promptly is to do (convolution) computing of convolution integration (convolution).Left side after HRTF 3D calculation process and right-channel signals are delivered to output buffer 50 more respectively and are stored.When if output device is a set of headphones, then the signal of this left and right sound channels can directly export earphone to the supper bass signal after synthesizer 53 synthesizes, and reaches the stereophonic effect with six sound channels of set of headphones simulation.
When being a pair of loud speaker, then the output signal of left and right sound channels being carried out interactive interference again and eliminate processing,, and make tonequality better with elimination interactive interference signal as employed output device.This interactive interference is eliminated the processing computing and will be illustrated by following examples.
For eliminating the interactive interference of left and right sound channels signal, an interactive interference is eliminated filter 55 (being made up of second buffer 45, second multiplier 47 and second adder 49) and is used to carry out further signal processing.Second buffer 45 is in order to store the transient state coefficient of calculating process, itself and second multiplier 47 and second adder 49 form feedback loop, wherein the output of second adder 49 is coupled to the input of second buffer 45, and the output of second buffer 45 is coupled to the input of second multiplier 47.Second multiplier 47 comprises a plurality of parallel multipliers will multiplying each other from the output result that the interactive interference of memory 41 is eliminated filter coefficient and HRTF (being above-mentioned left and right sound channels signal), and then multiplied result delivered to comprises that a plurality of second adders 49 parallel and serial adder carry out sum operation.Left and right sound channels signal after interactive interference is eliminated Filtering Processing is delivered to second output buffer 51 more respectively and is stored.This signal and supper bass signal after interactive interference is eliminated Filtering Processing directly exports a pair of loud speaker to after synthesizer 53 synthesizes, the present invention can realize the three-dimensional surrounding effect with six sound channels of a pair of loud speaker simulation.
The present invention compared with prior art has following effect:
The present invention also can add a data selector (52) in the above-described embodiments again, is a set of headphones or a pair of loud speaker in order to select output device.
The present invention only utilizes a set of headphones or a pair of loud speaker can simulate six sound channels of general digital dish DVD.Analogue means of the present invention and method can utilize a pair of loud speaker of existing home audio or PC to form the high tone quality sound of six sound source channels, thereby have saved the expense of extra four loud speakers and put the space.In addition, analogue means of the present invention and method can a wafer finish and in be built in DVD Player, DVD-Rom or other have in the acoustic device in multichannel ring field, therefore can't increase the exceptional space of whole device.
The foregoing description only is explanation principle of the present invention and effect thereof, and unrestricted the present invention.
Claims (29)
1, a kind of analogue means of multi-channel signal is characterized in that, comprising:
One input buffer is in order to received audio signal;
One memory stores at least two group coefficients;
One signal processor is coupled to the output of input buffer and memory, and the coefficient of the input audio signal that received and memory output is made convolution integration handle to produce an output signal;
One output buffer is coupled to the output of signal processor, in order to receive its output signal, exports this output signal to an output device again;
One controller is coupled to input buffer, memory, signal processor and output buffer, in order to the running of control and coordination analogue means.
2, analogue means according to claim 1 is characterized in that, described input audio signal is the audio signal through decoder decode.
3, analogue means according to claim 2 is characterized in that, described input audio signal comprises the signal of L channel, R channel, intermediate channel, left surround channel, right surround channel and supper bass sound channel.
4, analogue means according to claim 3 is characterized in that, described supper bass sound channel signal is directly delivered to described output device without described signal processor processes.
5, analogue means according to claim 1 is characterized in that, the coefficient of described memory storage is that human body head related transfer function coefficient and interactive interference are eliminated filter coefficient.
6, analogue means according to claim 1 is characterized in that, described signal processor comprises a multiplier and an adder.
7, analogue means according to claim 1 is characterized in that, described output device is a set of headphones.
8, analogue means according to claim 1 is characterized in that, described output device is a pair of loud speaker.
9, analogue means according to claim 1 is characterized in that, described analogue means is made in the wafer.
10, analogue means according to claim 3 is characterized in that, also comprises a synthesizer, in order to output signal and the supper bass sound channel signal that receives described output buffer, and these signals are synthetic to export described output device to.
11, a kind of analogue means of multi-channel signal comprises:
One simulator and a controller, controller is connected to simulator, in order to the running of control signal with control and coordination simulator to be provided, it is characterized in that, also comprises:
One input buffer is in order to receive the audio signal of input;
One memory stores the array coefficient;
One first signal processor is coupled to the output of input buffer and memory, and the input audio signal that received and the coefficient of memory output are circled round processing to produce one first output signal;
One first output buffer is coupled to the output of first signal processor, in order to receive first output signal;
One interactive interference is eliminated filter, be coupled to the output of first output buffer and the output of first buffer, handle to produce second output signal to make convolution integration in order to receive from first output signal of first output buffer and the coefficient of memory output; And
One data selector is coupled to first output buffer and second output buffer, outputs signal to an output device in order to select output first output signal or second.
12, analogue means according to claim 11 is characterized in that, described input audio signal is the audio signal through decoder decode.
13, analogue means according to claim 12 is characterized in that, described input audio signal comprises the signal of L channel, R channel, intermediate channel, left surround channel, right surround channel and supper bass sound channel.
14, analogue means according to claim 13 is characterized in that, described supper bass sound channel signal is promptly delivered to described output device without described signal processor processes.
15, analogue means according to claim 11 is characterized in that, the stored coefficient of described memory is that human body head related transfer function coefficient and interactive interference are eliminated filter coefficient.
16, analogue means according to claim 11 is characterized in that, described first and second signal processor respectively comprises a multiplier and an adder.
17, analogue means according to claim 11 is characterized in that, described output device is a set of headphones.
18, analogue means according to claim 11 is characterized in that, described output device is a pair of loud speaker.
19, analogue means according to claim 11 is characterized in that, analogue means is made in the wafer.
20, analogue means according to claim 13 is characterized in that, also comprises a synthesizer, in order to output signal and the described supper bass sound channel signal that receives described output buffer, and these signals are synthetic to export described output device to.
21, analogue means according to claim 11 is characterized in that, comprises that also one forms second buffer, second multiplier and the second adder of feedback loop.
22, a kind of analogy method of multi-channel signal is characterized in that, comprises the following steps:
Input audio signal is in an input buffer;
The coefficient that stores head related transfer function is in a memory;
With a signal processor coefficient of the head related transfer function of the input audio signal that received and memory output being made convolution integration handles to produce an output signal; And
Export the described output device that outputs signal to.
23, analogue means according to claim 22 is characterized in that, described audio signal is the audio signal through decoder decode.
24, analogue means according to claim 23 is characterized in that, described audio signal comprises L channel, R channel, intermediate channel, left surround channel, right surround channel and supper bass sound channel signal.
25, analogue means according to claim 24 is characterized in that, described supper bass sound channel signal is directly delivered to described output device without described signal processor processes.
26, analogue means according to claim 22 is characterized in that, the stored coefficient of described memory is that human body head related transfer function coefficient and interactive interference are eliminated filter coefficient.
27, analogue means according to claim 25 is characterized in that, comprises a synthesizer, receiving audio signal and the untreated supper bass sound channel signal after the described processing, and these signals are synthetic to export described output device to.
28, analogue means according to claim 22 is characterized in that, described output device is a pair of loud speaker.
29, analogue means according to claim 22 is characterized in that, described output device is a set of headphones.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98116835 CN1244084A (en) | 1998-07-30 | 1998-07-30 | Device and method for simulating multi-channel signals |
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| CN 98116835 CN1244084A (en) | 1998-07-30 | 1998-07-30 | Device and method for simulating multi-channel signals |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102752691A (en) * | 2012-07-30 | 2012-10-24 | 郝立 | Audio processing technology, 3D (three dimensional) virtual sound and applications of 3D virtual sound |
| CN102760437A (en) * | 2011-04-29 | 2012-10-31 | 上海交通大学 | Audio decoding device of control conversion of real-time audio track |
| CN106373582A (en) * | 2016-08-26 | 2017-02-01 | 腾讯科技（深圳）有限公司 | Multi-channel audio processing method and device |
| CN107040862A (en) * | 2016-02-03 | 2017-08-11 | 腾讯科技（深圳）有限公司 | Audio-frequency processing method and processing system |
-
1998
- 1998-07-30 CN CN 98116835 patent/CN1244084A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102760437A (en) * | 2011-04-29 | 2012-10-31 | 上海交通大学 | Audio decoding device of control conversion of real-time audio track |
| CN102760437B (en) * | 2011-04-29 | 2014-03-12 | 上海交通大学 | Audio decoding device of control conversion of real-time audio track |
| CN102752691A (en) * | 2012-07-30 | 2012-10-24 | 郝立 | Audio processing technology, 3D (three dimensional) virtual sound and applications of 3D virtual sound |
| CN107040862A (en) * | 2016-02-03 | 2017-08-11 | 腾讯科技（深圳）有限公司 | Audio-frequency processing method and processing system |
| CN106373582A (en) * | 2016-08-26 | 2017-02-01 | 腾讯科技（深圳）有限公司 | Multi-channel audio processing method and device |
| CN106373582B (en) * | 2016-08-26 | 2020-08-04 | 腾讯科技（深圳）有限公司 | Method and device for processing multi-channel audio |
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