CN1139300C - System for processing audio surround signal - Google Patents
System for processing audio surround signal Download PDFInfo
- Publication number
- CN1139300C CN1139300C CNB981043356A CN98104335A CN1139300C CN 1139300 C CN1139300 C CN 1139300C CN B981043356 A CNB981043356 A CN B981043356A CN 98104335 A CN98104335 A CN 98104335A CN 1139300 C CN1139300 C CN 1139300C
- Authority
- CN
- China
- Prior art keywords
- signal
- loud speaker
- order
- listener
- surround signal
- 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.)
- Expired - Lifetime
Links
Images
Landscapes
- Stereophonic System (AREA)
Abstract
A surround signal processing system receives a surround signal and also a program of processing the surround signal. The received surround signal is decoded into multiple-channel signals according to the received program. The multiple-channel signals include a left surround signal and a right surround signal. The multiple-channel signals are converted into two-channel signals according to the received program. The two-channel signals are transmitted to a pair of loudspeakers respectively. During the conversion of the multiple-channel signals into the two-channel signals, the left surround signal and the right surround signal are subjected to filtering processes according to the received program so that the left surround signal and the right surround signal will be converted into filtering-resultant signals. The two-channel signals are generated on the basis of the filtering-resultant signals.
Description
Technical field
The present invention relates to the system of a kind of processing around signal.The present invention relates to the method for a kind of processing around signal.The present invention relates to a kind of carrier, a kind of in order to store around signal handler.The present invention relates to a kind of transmission system that is used for around signal handler.The present invention relates to a kind of receiving system that is used for around signal handler.The present invention relates to a kind of device that is used to write down around signal.The present invention relates to a kind of method that is used to write down around signal.The present invention relates to a kind of tape deck that is used for around signal handler.
Background technology
The record multi-channel audio signal system several types is arranged, for example the 3-1 type of High-Vision and based on Dolby (Doby) around 4 sound channel matrix types.Many cinefilms have surround orbit, in order to delivery by the Dolby Surround sonication produce around information.At the cinema, acoustic information is reproduced by surround orbit, and with acoustic information decoding the becoming multi-channel sound signal that reproduces.These voice signals are imported loud speaker respectively, be converted into corresponding sound then.Loud speaker comprises preposition loud speaker and a rearmounted loud speaker, so that surrounding effect to be provided.
Having realized at present business-like serves as video tape and the videodisc that the basis is made step by step with this cinefilm, wherein has a step will duplicate acoustic information.These video tapes and videodisc have been stored by surround sound and have been handled the acoustic information that (for example Dolby Surround sonication) produces.In 4 sound channel ambiophonic systems of prior art, because rear side voice signal (around signal) is monaural, the therefore very difficult usually forward or backward movement of expressing the specific type of an acoustic image exactly.According to Dolby Surround,, therefore be difficult to accurately decoding usually because 4 sound channel matrixes are simulated.In 4 sound channel ambiophonic systems of prior art, limited the frequency band of surround orbit dramatically for avoiding cross-talk.
People such as the Craig C.Todd of Dolby Labs have proposed a kind of 5 channel audio forms, and " AC-3 " is also referred to as " Dolby Digital ".According to the AC-3 form, rear side sound can be by discrete showing around signal.
Especially, according to the AC-3 form, by a left signal, a right signal, a center signal, a left surround signal and a right surround signal constitute one group of 5 sound channel signal, and these signals were multiplexed in together before transmission.In common packaged media, can be on surround orbit with the signal record of AC-3 form.
Reproduce in the process of this information from the common packaged media that contains a surround orbit, acoustic information is reproduced from the sound track, and is decoded as 4 sound channel signals of Dolby Surround or 5 sound channel signals of Dolby Digital.As everyone knows, for the audio system without any rearmounted loud speaker, this 4 sound channel signals or 5 sound channel signals can be converted to the signal that has only 2 sound channels.This 2 sound channel signal is inputed to two preposition loud speakers respectively.The design that 4 sound channel signals or 5 sound channel signals are converted to 2 sound channel signals can provide one or more virtual rearmounted loud speaker, to realize surrounding effect.
Day unsighted patent application 8-51698 of the present disclosure discloses a kind of around signal processor, is used to contain 5 sound channel signals of a left surround signal and a right surround signal.At this around being two loud speakers after the signal processor.Around signal processor 5 sound channel signals are converted to 2 sound channel signals, then it are imported two loud speakers respectively.Comprise first adder around signal processor, second adder, first subtracter, second subtracter, first filter and second filter.Japanese publication 8-51698 around signal processor in, first adder is left surround signal and right surround signal addition, and exports a signal, expression left surround signal and right surround signal and.First subtracter deducts right surround signal from left surround signal, and exports a signal, represents the poor of left surround signal and right surround signal.The output signal of the first filter process first adder.The output signal of second filter process, first subtracter.Second adder is the output signal of first filter and the output signal addition of second filter, and exports a signal, represent the output signal of first filter and second filter output signal and.Second subtracter deducts the output signal of second filter from the output signal of first filter, and exports a signal, represents output signal poor of the output signal of first filter and second filter.The output signal of the output signal of second adder and second subtracter is imported loud speaker respectively.The transmission characteristic N of the transmission characteristic P of first filter and second filter is set to P=(F+K)/(S+A) and N=(F-K)/(S-A), and wherein " S " representative is in the transmission characteristic in the path of picking up the ears from the coupled end of loud speaker to listener one piece; " A " representative is in the transmission characteristic in the path of picking up the ears from the coupled end to of loud speaker piece; " F " representative is in the transmission characteristic from the desired location of the rear side acoustic image of location to the path that listener one picks up the ears piece; " K " representative from the desired location of the rear side acoustic image of location to the transmission characteristic in the path of opposite side ear.
Disclosed second is used to handle 5 sound channel signals that contain behind a left surround signal and around signal around signal processor among the Japanese publication 8-51698.At this around being two loud speakers after the signal processor.Should comprise four acoustic image positioning filter around signal processor.Via two acoustic image positioning filter left surround signal is transferred to two loud speakers respectively.Via two acoustic image positioning filter right surround signal is transferred to two loud speakers respectively.
Summary of the invention
The objective of the invention is to, the improvement system of a kind of processing audio around signal is provided.
It is a kind of around signal processing system that a first aspect of the present invention provides, comprising installing in order to receive around first of signal; In order to receive second device of a kind of processing around the program of signal; Become three device of multi-channel signal with what first device received around signal decoding in order to the program that receives according to second device, this multi-channel signal comprises a left surround signal and a right surround signal; The multi-channel signal of the 3rd device generation is converted to the 4th device of two sound channel signals in order to the program that receives according to second device; A pair of loud speaker; And the 5th device that transfers to loud speaker in order to two sound channel signals that the 4th device is produced respectively; Wherein the 4th device comprises in order to make the left surround signal of the 3rd device generation and the device that right surround signal carries out Filtering Processing according to second program of installing reception, thereby left surround signal and right surround signal are converted to the filtering composite signal, this filter is designed to only use under the situation of preposition loud speaker lacking rearmounted loud speaker, acoustic image is positioned listener's rearward position symmetrically, and the 4th device also comprises in order to produce two sound channel signals based on the filtering composite signal.
A second aspect of the present invention is based on its first aspect, provides a kind of around signal processing system, and wherein second device comprises a CD drive device, in order to read routine from a recording disk.
A third aspect of the present invention is based on its first aspect, provides a kind of around signal processing system, and wherein second device comprises a terminal equipment that links to each other with a kind of communication network, in order to reception program from communication network.
A fourth aspect of the present invention provides the method for a kind of processing around signal, comprising the following step: receive one around signal; Receive a kind of program of handling around signal; Become multi-channel signal according to what the program that receives will receive around signal decoding, this multi-channel signal comprises a left surround signal and a right surround signal; According to the reception program multi-channel signal is converted to two sound channel signals; Two sound channel signals are transferred to a pair of loud speaker respectively; Wherein switch process comprises the steps, make left surround signal and right surround signal carry out Filtering Processing according to the reception program, thereby left surround signal and right surround signal are converted to the filtering composite signal, this filter is designed to only use under the situation of preposition loud speaker lacking rearmounted loud speaker, acoustic image is positioned listener's rearward position symmetrically, and this step also comprises in order to produce two sound channel signals based on the filtering composite signal.
A fifth aspect of the present invention is based on its fourth aspect, and a kind of method is provided, and wherein the receiving step of program comprises the step of fetch program from a recording disk.
A sixth aspect of the present invention is based on its fourth aspect, and a kind of method is provided, and wherein the receiving step of program comprises the step of fetch program from a communication network.
A seventh aspect of the present invention provides a kind of carrier, to store the program of a processing around signal, this program comprises that being used for to be the step of multi-channel signal around signal decoding, this multi-channel signal comprises a left surround signal and a right surround signal, also comprise and be used to make left surround signal and right surround signal to carry out the step of Filtering Processing, thereby left surround signal and right surround signal are converted to the filtering composite signal, this filter is designed to only use under the situation of preposition loud speaker lacking rearmounted loud speaker, acoustic image is positioned symmetrically listener's rearward position.
A eighth aspect of the present invention provides a kind of carrier, wherein contain one first data recorded area and second data recorded area that distinguishes with first data record, first data recorded area is stored one around signal, processing of second data recorded area storage is around the program of signal, this program comprises that being used for to be the step of multi-channel signal around signal decoding, this multi-channel signal comprises a left surround signal and a right surround signal, also comprise the step that is used for left surround signal and right surround signal are carried out Filtering Processing, thereby left surround signal and right surround signal are converted to the filtering composite signal, this filter is designed to only use under the situation of preposition loud speaker lacking rearmounted loud speaker, acoustic image is positioned symmetrically listener's rearward position.
A ninth aspect of the present invention provides a kind of transmission system that is used for around signal handler, comprising in order to store first device of a processing around the program of signal, this program comprises that being used for to be the step of multi-channel signal around signal decoding, this multi-channel signal comprises a left surround signal and a right surround signal, also comprise and be used to make left surround signal and right surround signal to carry out the step of Filtering Processing, thereby left surround signal and right surround signal are converted to the filtering composite signal, this filter is designed to only use under the situation of preposition loud speaker lacking rearmounted loud speaker, acoustic image is positioned symmetrically listener's rearward position; A terminal equipment that links to each other with communication network; Install second device that links to each other with terminal equipment with first, in order to program is transferred to communication network from first device via terminal equipment.
A tenth aspect of the present invention provides a kind of receiving system that is used for around signal handler, comprising a terminal equipment that links to each other with communication network; The device that links to each other with terminal equipment is in order to receive program via terminal equipment from communication network; Wherein this program comprises that being used for to be the step of multi-channel signal around signal decoding, this multi-channel signal comprises a left surround signal and a right surround signal, also comprise and be used to make left surround signal and right surround signal to carry out the step of Filtering Processing, thereby left surround signal and right surround signal are converted to the filtering composite signal, this filter is designed to only use under the situation of preposition loud speaker lacking rearmounted loud speaker, acoustic image is positioned symmetrically listener's rearward position.
A eleventh aspect of the present invention provides a kind of tape deck that is used for around signal, comprising in order to will around signal decoding be multi-channel signal first the device, this multi-channel signal comprise a left surround signal and a right surround signal second the device; Be converted to second device of two sound channel signals in order to the multi-channel signal that first device is produced; And in order to second two sound channel signals that install generation are recorded in the 3rd device on a kind of recording medium; Wherein second device comprises usefulness so that the device that left surround signal that first device produces and right surround signal carry out Filtering Processing, thereby left surround signal and right surround signal are converted to the filtering composite signal, this filter is designed to only use under the situation of preposition loud speaker lacking rearmounted loud speaker, acoustic image is positioned listener's rearward position symmetrically, and in order to produce the device of two sound channel signals according to the filtering composite signal.
A twelveth aspect of the present invention provides the method for a kind of record around signal, comprising step have, with one be multi-channel signal around signal decoding, this multi-channel signal comprises a left surround signal and a right surround signal; This multi-channel signal is converted to two sound channel signals; And two sound channel signals are recorded on a kind of recording medium; Wherein switch process comprises that usefulness is so that left surround signal and right surround signal carry out the step of Filtering Processing, thereby left surround signal and right surround signal are converted to the filtering composite signal, this filter is designed to only use under the situation of preposition loud speaker lacking rearmounted loud speaker, acoustic image is positioned listener's rearward position symmetrically, and in order to produce the step of two sound channel signals according to the filtering composite signal.
A thirteenth aspect of the present invention provides a kind of tape deck that is used for around signal handler, comprising the coding composite signal that is used for containing a kind of form that is suitable for writing down with being encoded to around signal handler; Be used for the coding composite signal that first device produces is recorded in the device of second on a kind of carrier; Wherein comprise that around signal handler being used for to be the step of multi-channel signal around signal decoding, this multi-channel signal comprises a left surround signal and a right surround signal, and with so that left surround signal and right surround signal carry out the step of Filtering Processing, thereby left surround signal and right surround signal are converted to the filtering composite signal, this filter is designed to only use under the situation of preposition loud speaker lacking rearmounted loud speaker, acoustic image is positioned symmetrically listener's rearward position.
Description of drawings
Fig. 1 is a block diagram around signal processing system according to first embodiment of the invention.
Fig. 2 is the part of system among Fig. 1 and a listener's sketch.
Fig. 3 is the part of system among Fig. 1 and a listener's sketch.
Fig. 4 is the sketch of rearmounted loud speaker and a virtual speaker and a listener in Fig. 1 system.
Fig. 5 is a block diagram around signal processing system according to second embodiment of the invention.
Fig. 6 is the part of system among Fig. 5 and a listener's sketch.
Fig. 7 is a block diagram according to the personal computer of third embodiment of the invention.
Fig. 8 is the flow chart of first operator scheme of personal computer among Fig. 7.
Fig. 9 is the flow chart of second operator scheme of personal computer among Fig. 7.
Figure 10 is the flow chart of the details of a program block among Fig. 9.
Figure 11 is the sketch of a kind of recording disk in the fourth embodiment of the invention.
Figure 12 is the operational flowchart of personal computer in the fourth embodiment of the invention.
Figure 13 is the block diagram of the network terminal in the fifth embodiment of the invention.
Figure 14 is the flow chart of the program first of Figure 13 middle controller.
Figure 15 is the flow chart of the program second portion of Figure 13 middle controller.
Figure 16 is the block diagram of tape deck in the sixth embodiment of the invention.
Figure 17 is the block diagram of transcriber in the sixth embodiment of the invention.
Figure 18 is the block diagram of tape deck in the seventh embodiment of the invention.
Figure 19 is the block diagram of transcriber in the seventh embodiment of the invention.
Figure 20 is the block diagram of tape deck in the eighth embodiment of the invention.
Figure 21 is the block diagram of transcriber in the eighth embodiment of the invention.
Figure 22 is a kind of block diagram around signal processing system according to ninth embodiment of the invention.
Figure 23 is a kind of block diagram around signal processing system according to tenth embodiment of the invention.
Figure 24 is the flow chart of the operating procedure piece of personal computer in the eleventh embodiment of the invention.
Embodiment
First embodiment
With reference to figure 1, an AC-3 decoder 1 receives the input digital audio signal with AC-3 form, and this input digital audio signal is decoded as a left signal L with a kind of known way, a right signal R, a center signal C, a left surround signal SL, a right surround signal SR and one bass signal.Usually, left signal L, right signal R, center signal C, left surround signal SL, right surround signal SR and inferior bass signal are all simulated.Left signal L, right signal R, center signal C, left surround signal SL and right surround signal SR constitute one group of 5 sound channel signal.Left surround signal SL and right surround signal SR are postsignal, and left signal L and right signal R are advance signal simultaneously.The frequency of inferior bass signal can change in being less than or equal to the scope of 100Hz.In the stage subsequently, do not use time bass signal.
It after AC-3 decoder 1 signal processing circuit 2.Signal processing circuit 2 receives left signal L, right signal R, center signal C, left surround signal SL, right surround signal SR from AC-3 decoder 1.Signal processing circuit 2 is 5 sound channel signal L, R, and C, SL and SR are converted to 2 sound channel signals, and they are inputed to two loud speaker 3L and 3R respectively.Signal processing circuit 2 comprises filter 21a, 21b, 21c and 21d, attenuator 21e and adder 21f, 21g, 21h and 21i.
Filter 21a receives left surround signal SL from AC-3 decoder 1.Filter 21a carries out a kind of given Filtering Processing to left surround signal SL, in order to the rear side acoustic image is positioned at listener's left side.Filter 21a exports to adder 21h with the filtering composite signal.Filter 21b receives left surround signal SL from AC-3 decoder 1.Filter 21b carries out a kind of given Filtering Processing to left surround signal SL, in order to the rear side acoustic image is positioned at listener's left side.Filter 21b exports to adder 21i with the filtering composite signal.Filter 21c receives right surround signal SR from AC-3 decoder 1.Filter 21c carries out a kind of given Filtering Processing to right surround signal SR, in order to the rear side acoustic image is positioned at listener's right side.Filter 21c exports to adder 21h with the filtering composite signal.Filter 21d receives right surround signal SR from AC-3 decoder 1.Filter 21d carries out a kind of given Filtering Processing to right surround signal SR, in order to the rear side acoustic image is positioned at listener's right side.Filter 21d exports to adder 21i with the filtering composite signal.
After signal processing circuit 2 is that loud speaker 3L is put on an a pair of left side and loud speaker 3R is put on the right side.Specifically, loud speaker 3L is put immediately following after the adder 21h in signal processing circuit 2 in a left side.Loud speaker 3R is put immediately following after the adder 21i in signal processing circuit 2 in the right side.The output signal that loud speaker 3L receives adder 21h is put on a left side, and the conversion of signals that receives is become corresponding sound.The output signal that loud speaker 3R receives adder 21i is put on the right side, and the conversion of signals that receives is become corresponding sound.For example, provide in television receiver that loud speaker 3L is put on a left side and loud speaker 3R is put on the right side.
Usually, a left side is put loud speaker 3L and is put the front that loud speaker 3R is positioned at the listener with the right side.With apparent, provide a virtual rear side left side to put loud speaker and loud speaker is put on a virtual rear side right side as subsequently, to realize surrounding effect to the Signal Processing that inputs to preposition loud speaker 3L and 3R.In addition, provide a virtual front side center loudspeaker to the Signal Processing that inputs to preposition loud speaker 3L and 3R.
With reference to figure 2, filter 21a, 21b, 21c and 21d are the FIR filters with part A tal- Schroeder type.Filter 21a, 21b, 21c and 21d are designed to rear side acoustic image location, also are used to eliminate the cross-talk between the related sound channel of loud speaker 3L and loud speaker 3R.On design and structure, a cover filter 21a is similar with 21d to a cover filter 21c with 21b.Therefore, hereinafter only explain a cover filter 21a and a 21b in detail.
As shown in Figure 3, filter 21a contains a common segment 21p and a private part 21q.Filter 21b contains common segment 21p and a private part 21r.Common segment 21p comprises filter element 101,102,103 and 104 and adder 105 and 106.Left surround signal SL is transfused to filter element 101 and 103, and filtered at this.The function of filter element 101 corresponding to the convolution of transfer function " F ".The function of filter element 103 corresponding to the convolution of transfer function " K ".The output signal of filter element 101 is transfused to filter element 102, and filtered at this.The function of filter element 102 corresponding to result " C " convolution of operation " S/A ", wherein " S " and " A " represent transfer function, and "/" represents against convolution.The output signal of filter element 103 is transfused to filter element 104, and filtered at this.The function of filter element 104 corresponding to the operation " S/A " result " C " convolution.The output signal of the output signal of filter element 101 and filter element 104 is transfused to adder 105, and in this addition.The output signal of the output signal of filter element 103 and filter element 102 is transfused to adder 106, and in this addition.
The private part 21q of filter 21a comprises filter element 107 and 108.The output signal of adder 105 is transfused to filter element 107, and filtered at this.The function of filter element 107 corresponding to the operation " 1/ (1-C2) " convolution as a result.The output signal of filter element 107 is transfused to filter element 108, and filtered at this.The function of filter element 108 corresponding to the operation " 1/S " convolution as a result.The output signal of filter element 108 is transfused to a left side puts loud speaker 3L.
The private part 21r of filter 21b comprises filter element 109 and 110.The output signal of adder 106 is transfused to filter element 109, and filtered at this.The function of filter element 109 corresponding to the operation " 1/ (1-C2) " convolution as a result.The output signal of filter element 109 is transfused to filter element 110, and filtered at this.The function of filter element 110 corresponding to the operation " 1/S " convolution as a result.The output signal of filter element 110 is transfused to the right side puts loud speaker 3R.
Filter element 101 and 103 is as the acoustic image positioning filter.Filter element 102,104,107,109 and 110, and adder 105 and 106 has been formed a cross-talk elimination filter array.
Be positioned in the position of relative listener's symmetry referring to figs. 2 and 3, loud speaker 3L and 3R.At listener's Zuo Erchu, voice output X ' and the right synthetic x0 that puts the voice output Y ' of loud speaker 3R that loud speaker 3L is put on a left side are provided by following formula.
X0=SX '+AY ' (1) is the transfer function of " S " representative voice path of left side ear from left speaker 3L to the listener wherein, and the transfer function of loud speaker 3R to the voice path of listener left side ear put in " A " representative from the right side.Transfer function " S " and " A " are predetermined according to experiment.At listener's auris dextra place, voice output X ' and the right synthetic y0 that puts the voice output Y ' of loud speaker 3R that loud speaker 3L is put on a left side are provided by following formula.
Y0=AX '+SY ' (2) is the transfer function of the voice path of " S " representative from right speaker 3R to listener's auris dextra wherein, and the transfer function of loud speaker 3L to the voice path of listener's auris dextra put in " A " representative from a left side.
Hereinafter will provide explanation about the Design of Filter of eliminating cross-talk.With reference to figure 3, equal at synthetic x0 under the situation of output signal X (that is, inputing to the signal that cross-talk is eliminated filter array) of filter element 101, usefulness " X " replacement " x0 " in equation (1), (1) formula becomes following formula thus.
X=SX '+AY ' (3) equals at synthetic y0 under the situation of output signal Y (that is, inputing to the signal that cross-talk is eliminated filter array) of filter element 103, and with " Y " replacement " y0 ", (2) formula becomes following formula thus in (2) formula.
Y＝AX’+SY’ (4)
With reference to (3) formula and (4) formula, voice output X ' and the right voice output Y ' that puts loud speaker 3R that loud speaker 3L is put on a left side are expressed as follows.
X’＝(SX-AY)/(S
2-A
2) (5)
Y’＝(SY-AX)/(S
2-A
2) (6)
Hereinafter will provide explanation about the Design of Filter of acoustic image location.Referring to figs. 2 and 3, suppose that the desired location Xp (that is the desired location Xp at rear side acoustic image place) in virtual rearmounted left speaker locates to produce a source signal " x ".In the case, the voice signal that occurs at ear place, a listener left side is expressed makes convolution results " Fx ", wherein the transfer function of " F " representative voice path of left side ear from desired location Xp to the listener.The voice signal that occurs at listener's auris dextra place is expressed makes convolution results " Kx ", wherein the transfer function of the voice path of " K " representative from desired location Xp to listener's auris dextra.Transfer function " F " and " K " are predetermined according to experiment.
When in (5) formula and (6) formula, using convolution results " Fx " and " Kx " to replace " X " and " Y " respectively, realized the acoustic image location.In the case, (5) formula and (6) formula become following formula.
X’＝{(SF-AK)/(S
2-A
2)}·x (7)
Y '=(SK-AF)/(S
2-A
2) x (8) thus, relate to the filter coefficient Hl of filter 21a and relate to the filter coefficient Hr of filter 21b given as follows.
Hl＝(SF-AK)/(S
2-A
2) (9)
Hr＝(SK-AF)/(S
2-A
2) (10)
Similarly, the filter coefficient that relates to filter 21c equals " Hr " that represented by (10) formula, and the filter coefficient that relates to filter 21d equals " Hl " that represented by (9) formula.
With reference to figure 1, in signal processing circuit 2, left signal L is transferred to a left side from AC-3 decoder 1 and put loud speaker 3L conversely via adder 21f and 21h.Put loud speaker 3L by a left side left signal L is converted to corresponding sound.In signal processing circuit 2, right signal R is transferred to the right side from AC-3 decoder 1 and put loud speaker 3R via adder 21g and 21i.Put loud speaker 3R by the right side right signal R is converted to corresponding sound.In signal processing circuit 2, center signal C is inputed to attenuator 21e from AC-3 decoder 1, be attenuated 3dB herein.Via the adder 21f in the signal processing circuit 2,21g, 21h and the 21i synthetic center signal C that will decay distributes to loud speaker 3L and 3R equally.Be converted to corresponding sound equally by loud speaker 3L and the 3R synthetic center signal C that will decay.In signal processing circuit 2, left surround signal SL is inputed to filter 21a and 21b from AC-3 decoder 1.By filter 21a and 21b left surround signal SL is carried out a left acoustic image localization process and a kind of cross-talk elimination processing.By adder 21h the output signal of filter 21a is added on left signal L and the synthetic center signal C of decay.The composite signal of will suing for peace is transferred to a left side and puts loud speaker 3L, then it is taken this to be converted to corresponding sound.By adder 21i the output signal of filter 21b is added on right signal R and the synthetic center signal C of decay.The composite signal of will suing for peace is transferred to the right side and puts loud speaker 3R, then it is taken this to be converted to corresponding sound.By filter 21c and 21d right surround signal SR is carried out a right acoustic image localization process and a kind of cross-talk elimination processing.By adder 21h the output signal of filter 21c is added on left signal L and the synthetic center signal C of decay.The composite signal of will suing for peace is transferred to a left side and puts loud speaker 3L, then it is taken this to be converted to corresponding sound.By adder 21i the output signal of filter 21d is added on right signal R and the synthetic center signal C of decay.The composite signal of will suing for peace transfers to the right side and puts loud speaker 3R, then it is taken this to be converted to corresponding sound.
As shown in Figure 4, put the true loud speaker that loud speaker 3R constitutes except put the loud speaker 3L and the right side, front side by a left side, front side, also provide three virtual speakers, promptly, loud speaker 116 is put on 115, one virtual rear side left sides of a virtual front side center loudspeaker and loud speaker 117 is put on a virtual rear side right side.The listener can feel the sound of being represented by center signal C, the sound of representing by left surround signal SL, and seem by virtual front side center loudspeaker 115 by the sound that right surround signal SR represents, a virtual rear side left side is put loud speaker 116 and the virtual rear side right side and is put that loud speaker 117 produces respectively.
Should be noted that AC-3 decoder 1 and signal processing circuit 2 can be made of a digital signal processor (DSP), wherein contain an input/output end port, a processing unit, the combination of a ROM and a RAM.In the case, AC-3 decoder 1 and digital processing circuit 2 move according to the program that is stored among the ROM.This program is designed in order to implement the previous function of indicating of AC-3 decoder 1 and signal processing circuit 2.This program also is called as AC-3 around signal handler.
Second embodiment
With reference to figure 5, AC-3 decoder 1 receives the input digital audio signal of an AC-3 form, and this input digital audio signal is decoded as a left signal L with a kind of known way, a right signal R, a center signal C, a left surround signal SL, a right surround signal SR and one bass signal.Usually, left signal L, right signal R, center signal C, left surround signal SL, right surround signal SR and inferior bass signal are all simulated.Left signal L, right signal R, center signal C, left surround signal SL and right surround signal SR constitute a cover 5 sound channel signals.Left surround signal SL and right surround signal SR are postsignal, and left signal L and right signal R are advance signal simultaneously.The frequency of inferior bass signal can change in being less than or equal to the scope of 100Hz.In the stage subsequently, do not use time bass signal.
After AC-3 decoder 1 a signal processing circuit 2A.Signal processing circuit 2A receives left signal L, right signal R, center signal C, left surround signal SL, right surround signal SR from AC-3 decoder 1.Signal processing circuit 2A is 5 sound channel signal L, R, and C, SL and SR are converted to 2 sound channel signals, and they are inputed to two loud speaker 3L and 3R respectively.Signal processing circuit 2A comprises (shuffler) filter 22a that shuffles, attenuator 22b and adder 22c, 22d, 22e and 22f.
After signal processing circuit 2A is that loud speaker 3L is put on an a pair of left side and loud speaker 3R is put on the right side.Specifically, loud speaker 3L is put immediately following after the adder 22e in signal processing circuit 2A in a left side.Loud speaker 3R is put immediately following after the adder 22f in signal processing circuit 2A in the right side.The output signal that loud speaker 3L receives adder 22e is put on a left side, and the conversion of signals that receives is become corresponding sound.The output signal that loud speaker 3R receives adder 22f is put on the right side, and the conversion of signals that receives is become corresponding sound.For example, provide in television receiver that loud speaker 3L is put on a left side and loud speaker 3R is put on the right side.
Usually, a left side is put loud speaker 3L and is put the front that loud speaker 3R is positioned at the listener with the right side.With apparent, provide a virtual rear side left side to put loud speaker and loud speaker is put on a virtual rear side right side as subsequently, to realize surrounding effect to the Signal Processing that inputs to preposition loud speaker 3L and 3R.In addition, provide a virtual front side center loudspeaker to the Signal Processing that inputs to preposition loud speaker 3L and 3R.
As shown in Figure 6, positive shift filter 22a comprises 121, one buffers 122 of an inverter, adder 123 and 124, filter element 125 and 127, one inverters 128 of 126, one buffers, and adder 129 and 130.Left surround signal SL is inputed to inverter 121 and adder 123.Inverter 121 multiply by " 1 " with left surround signal SL.In other words, device 121 makes left surround signal SL anti-phase.Inverter 121 is exported to adder 124 with anti-phase composite signal.Right surround signal SR is inputed to buffer 122 and adder 124.Buffer 122 is transferred to adder 123 with right surround signal SR, and right surround signal SR is not carried out any processing.A signal indication left surround signal SL and right surround signal SR sum are exported in 123 couples of left surround signal SL of adder and right surround signal SR summation.The poor of a signal indication left surround signal SL and right surround signal SR exported in the anti-phase summation of 124 couples of right surround signal SR of adder and left surround signal SL.
The output signal of adder 123 is inputed to filter element 125, take this to come filtering according to filter coefficient " P ".The output signal of filter element 125 is inputed to buffer 127 and adder 129.Buffer 127 is transferred to adder 130 with the output signal of filter element 125, and the output signal of filter element 125 is not carried out any processing.The output signal of adder 124 is inputed to filter element 126, take this to come filtering according to filter parameter " N ".The output signal of filter element 126 is inputed to inverter 128 and adder 130.Inverter 128 multiply by " 1 " with the output signal of filter element 126.In other words, device 128 makes the output signal of filter element 126 anti-phase.Inverter 128 is exported to adder 129 with anti-phase composite signal.The anti-phase summation of the output signal of 129 pairs of filter elements 125 of adder and the output signal of filter element 126, the output signal of output output signal of a signal indication filter element 125 and filter element 126 poor.The output signal of adder 129 is inputed to a left side put loud speaker 3L.The summation of the output signal of 130 pairs of filter elements 125 of adder and the output signal of filter element 126, the output signal of a signal indication filter element 125 of output and the output signal of filter element 126 poor.The output signal of adder 130 is inputed to the right side put loud speaker 3R.
Filter coefficient " P " and " N's " is definite as follows.(5) formula and (6) formula are become following formula.
X’＝{(X-Y)/(S-A)}+Y’ (11)
Y '={ (X+Y)/(S+A) }-X ' (12) becomes following formula with (11) formula and (12) formula.
2X’＝{(X-Y)/(S-A)}+{(X+Y)/(S+A)} (13)
The Design of Filter of 2Y '={ (X+Y)/(S+A) }-{ (X-Y)/(S-A) } (13) Fig. 6 provides following formula.
X’＝N(X-Y)+P(X+Y) (15)
Y '=P (X+Y)-N (X-Y) (16) compares (15) formula with (13) formula with (16) formula with (14) formula, then can get following formula when ignoring constant.
P＝1/(S+A) (17)
N=1/ (S-A) (18) can get following formula when " P " and " N " value in the filter coefficient of representing with relation (17) and (18) " P " and " N " replacement (15) formula and (16) formula.
X’＝2(SX-AY)/(S
2-A
2) (19)
Y’＝2(SY-AX)/(S
2-A
2) (20)
Now, be provided with filter coefficient " P " and " N " as follows.
P＝(F+K)/(S+A) (21)
N=(F-K)/(S-A) (22) wherein " F " expression puts the transfer function of the desired location Xp of acoustic image to the voice path of listener left side ear from the rear side left side of location, also represent from the rear side right side of location and put the transfer function of the desired location Yp of acoustic image, the transfer function of the voice path of " K " expression and the transfer function of voice path of left side ear from desired location Yp to the listener from desired location Xp to listener's auris dextra to the voice path of listener's auris dextra.When the value " P " in the filter coefficient of representing with relation (21) and (22) " P " and " N " replacement (15) and (16) formula and " N ", can get following formula.
X’＝2(SFX+SKY-AFY-AKX)/(S
2-A
2)(23)
Y '=2 (SFY+SKX-AFX-AKY)/(S
2-A
2) (24) when with " X=x " and " Y=0 " replacement in (23) and (24) formula value " X " and when " Y ", can get following formula.
X’＝{2(SF-AK)/(S
2-A
2)}·x (25)
Y '={ 2 (SK-AF)/(S
2-A
2) x (26) on the other hand, when with " X=0 " and " Y=y " replacement in (23) and (24) formula value " X " and when " Y ", can get following formula.
X’＝{2(SK-AF)/(S
2-A
2)}·y (27)
Y '={ 2 (SF-AK)/(S
2-A
2) y (28) (25), (26), (27) and (28) formula represents that acoustic image is positioned at rearward position symmetrically with respect to the listener.
With reference to figure 5, in signal processing circuit 2A, left signal L is transferred to a left side via adder 22c and 22e from AC-3 decoder 1 and put loud speaker 3L.Put loud speaker 3L by a left side left signal L is converted to corresponding sound.In signal processing circuit 2A, right signal R is transferred to a left side via adder 22d and 22f from AC-3 decoder 1 and put loud speaker 3R.Put loud speaker 3R by the right side right signal R is converted to corresponding sound.In signal processing circuit 2A, center signal C is inputed to attenuator 22b from AC-3 decoder 1, and take this its decay 3dB.Via adder 22c, 22d, 22e and the 22f synthetic center signal C that will decay distributes to loud speaker 3L and 3R equally in signal processing circuit 2A.Be converted to corresponding sound equally by loud speaker 3L and the 3R synthetic center signal C that will decay.In sound treatment circuit 2A, left surround signal SL and right surround signal SR are inputed to positive shift filter 22a from AC-3 decoder 1.In order to rearmounted acoustic image is positioned the processing of shuffling on listener left side and right side, positive shift filter 22a is converted to a left channel signals and a right-channel signals with left surround signal SL and right surround signal SR by a kind of.Positive shift filter 22a exports to adder 22e with left channel signals.Positive shift filter 22a exports to adder 22f with right-channel signals.By adder 22e the L channel output signal of positive shift filter 22a is added on left signal L and the synthetic center signal C of decay.The composite signal of will suing for peace is transferred to a left side and puts loud speaker 3L, takes this to be converted into corresponding sound then.By adder 22f the R channel output signal of positive shift filter 22a is added on right signal R and the synthetic center signal C of decay.The composite signal of will suing for peace is transferred to the right side and puts loud speaker 3R, takes this to be converted into corresponding sound then.
As shown in Figure 4, put the real loud speaker that loud speaker 3R constitutes except put the loud speaker 3L and the right side, front side by a left side, front side, also provide three virtual speakers, promptly, loud speaker 116 is put on 115, one virtual rear side left sides of a virtual front side center loudspeaker and loud speaker 117 is put on a virtual rear side right side.The listener can feel and seems the sound represented by center signal C, the sound of representing by left surround signal SL, and whether the sound of being represented by right surround signal SR is by virtual front side center loudspeaker 115, a virtual rear side left side is put loud speaker 116 and the virtual rear side right side and is put that loud speaker 117 produces respectively.
The 3rd embodiment
With reference to figure 7, personal computer 6 comprises 5, one CPU 6a of 4, one network terminals of a CD drive, a RAM 6b, a data transducer 6c, an audio interface 6d, a keyboard interface 6e and a keyboard 6f.CD drive 4, the network terminal 5 is linked to each other by a bus with data converter 6c.CPU 6a, RAM 6b, data converter 6c, audio interface 6d is linked to each other by a bus with keyboard interface 6e.CPU 6a comprises a RAM.Keyboard 6f links to each other with keyboard interface 6e.Audio interface 6d links to each other with 3R with loud speaker 3L.The network terminal 5 links to each other with communication network such as Internet (Internet).The network terminal 5 receives data according to the known protocol such as " TCP/IP " to the communication network transmission and from it.
AC-3 is stored in the CD around signal handler.When CD was placed CD drive 4, personal computer 6 can be read AC-3 around signal handler via CD drive 4 from CD.
Fig. 8 is the flow chart of first operator scheme of personal computer 6, when via program call instruction of keyboard 6f input it is started.With reference to figure 8, first step S1 determines that program is called in and marks whether to be " 0 ".The program of it should be noted that is called in be initially set to " 0 " of mark.Program is called in mark and is designed to expression and whether has realized that program calls in.Call in when being labeled as " 0 " when program, that is, when still the program of being unrealized was called in, the operation of personal computer 6 proceeded to the S2 step from the S1 step.Otherwise the operation of personal computer 6 was withdrawed from from the S1 step, and the operation of personal computer 6 stops then.
S2 step exciting light disk drive 4, and read AC-3 around signal handler in the CD from CD drive 4.S2 step transfers to RAM in CPU 6a around signal handler from CD drive 4 with AC-3 via data converter 6c.Be set to " 1 " immediately following calling in mark, thereby program is called in the mark representation program and is called in and realize in the S3 of S2 step sum step program.After step, the operation of personal computer 6 stops at S3.
CD is arranged as around the source, the digital audio that obtains from 5 multiplexing sound channel signals (i.e. a left signal L, a right signal R, a center signal C, a left surround signal SL and a right surround signal SR) with storage is around signal.When CD is placed CD drive 4, personal computer 6 can via CD drive 4 from CD the reading number Audio Loop around signal.
Fig. 9 is the flow chart of second operator scheme of personal computer 6, when via dvd playback instruction of keyboard 6f input it is started.With reference to figure 9, first step S4A determines that program is called in and marks whether to be " 1 ".Call in when being labeled as " 1 " when program, that is, when realization program was called in, the operation of personal computer 6 proceeded to S4B from the S4A step and goes on foot.Otherwise the operation of personal computer 6 proceeds to S7 from the S4A step and goes on foot.
S4B step exciting light disk drive 4, and first track of the CD in the visit CD drive 4 are therefrom to read subcode information.Subcode information is represented the type of CD.The S4B step determines whether the type of CD indicates one around the source.When one of the type of CD indication during around the source, the operation of personal computer 6 proceeds to piece S5 from the S4B step.Otherwise the operation of personal computer 6 proceeds to S7 from the S4B step and goes on foot.
Piece S5 exciting light disk drive 4, and from next track of CD wherein sense data.Piece S5 is decoded as 5 channel data sections with sense data, and around signal handler 5 channel data sections is converted to 2 channel data sections according to AC-3.
2 channel data sections are transferred to audio interface 6d immediately following the step of the S6A after the piece S5.Audio interface 6d is converted to corresponding 2 vocal tract analog signals respectively with 2 channel data sections, and 2 vocal tract analog signals are inputed to loud speaker 3L and 3R respectively.，
Go on foot last track that has determined whether to visit CD in the CD drive 4 at the S6B of S6A after the step.During last track of CD, the operation of personal computer 6 is not back to piece S5 from S6B in visiting CD drive 4 as yet.In having visited CD drive 4 during last track of CD, the operation of personal computer 6 was withdrawed from from the S6B step, stopped then.
S7 step control display (not shown) is in order to illustrate " can not play " on display.After step, the operation of personal computer 6 stops at S7.
As shown in figure 10, the sequence of steps of piece S5 is S31, S32, S33 and S34 step.First step S31 among the piece S5 with a kind of known by AC-3 around the given method of signal handler based on " AC-3 ", sense data is decoded as 5 channel data sections.5 channel data Duan Weiyi left data segments, a right data segment, a centre data section, left side around data segment and a right side around data segment.The S31 step is corresponding with the AC-3 decoder 1 among Fig. 1.
, closely follow the S32 step of S31 after the step left side is carried out Filtering Processing around the data segment and the right side around data segment, around signal handler according to AC-3 in order to acoustic image is positioned at rearward position about listener's symmetry.Filter 21a among S32 step and Fig. 1,21b, 21c is corresponding with 21d.
Around signal handler, the centre data section is equivalent to the processing that 3dB decays according to AC-3 in the S33 step of S32 after the step.The S33 step is with left data segment and the synthetic centre data section summation of decay.The S33 step is with right data segment and the synthetic centre data section summation of decay.Attenuator 21e among S33 step and Fig. 1 and adder 21f and 21g are corresponding.
Around signal handler, the data segment summation that data segment that the S32 step is produced immediately following the step of the S34 after S33 step and S33 step produce also synthesizes 2 channel data sections according to AC-3.The S34 step is corresponding with adder 21h and the 21i of Fig. 1.
The 4th embodiment
Except the design that will illustrate hereinafter changed, the fourth embodiment of the present invention and its 3rd embodiment were similar.
With reference to Figure 11, CD 7 is that a diameter is for example optical record medium of 120mm.CD 7 is for example according to a CD plus or an enhancement mode music CD of known standard.
CD 7 is observed concentric in the following order one first introducing that is arranged with by radially outer direction and is distinguished 7a, and one first data field 7b introduces district 7c for one first, introduces for one second and distinguishes 7d, one second data field 7e and one second introducing district 7f.
The first introducing district 7a is a TOC (contents list) district, in order to the TOC information in 7b store data inside address, first data field.Similarly, the second introducing district 7d is a toc region (contents list) district, in order to the 2nd TOC information in 7e store data inside address, second data field.
Data description in the first data field 7b AC-3 around signal handler.The first data field 7b is divided into the last period and back one section.AC-3 is stored in the last period of the first data field 7b around signal handler.Back one section information that stores test data and relevant correct result with test data decode of the first data field 7b.On the other hand, the data in the second data field 7e are corresponding to around the source.
When placing CD 7 in the CD drive 4 (referring to Fig. 7), personal computer 6 (referring to Fig. 7) can be read AC-3 around signal handler with around the source via CD drive 4 from CD 7.
Figure 12 is the flow chart of a kind of operator scheme of personal computer 6, when CD 7 being placed around CD drive 4 (referring to Fig. 7) and it being started during via a dvd playback instruction of keyboard 6f input (referring to Fig. 7).With reference to Figure 12, first step S11 determines that program is called in and marks whether to be " 1 " promptly, whether realization program is called in.The program of it should be noted that is called in be initially set to " 0 " of mark.Call in when being labeled as " 1 " when program, that is, when realization program was called in, the operation of personal computer 7 proceeded to S21 from the S11 step and goes on foot.Otherwise the operation of personal computer 6 proceeds to S12 from the S11 step and goes on foot.
District 7a is introduced in S12 step visit first, and therefrom reads a TOC information.S12 step is according to a TOC message reference first data field 7b, and sense data (AC-3 is around signal handler) therefrom.
Still lack AC-3 around signal handler immediately following existing in definite data of from the first data field 7b, reading of S13 step of S12 after the step.When lacking AC-3 around signal handler, the operation of personal computer 6 was withdrawed from from the S13 step, termination then.When AC-3 existed around signal handler, the operation of personal computer 6 proceeded to S14 from the S13 step and goes on foot.
S14 step is written into RAM (referring to Fig. 7) among the CPU 6a with AC-3 around signal handler.
The S15 step after S14 step determines whether all AC-3 have been written into RAM in the CPU 6a around signal handler.When all AC-3 had been written into around signal handler, the operation of personal computer 6 proceeded to the S16 step from S15.Otherwise the operation of personal computer 6 is back to S12 from the S15 step and goes on foot.
The S16 step visit first data field 7b, and therefrom read test data and correct decoded result information.S16 step is with test data and the correct decoded result message transmission RAM to the CPU 6a.
Immediately following the step of the S17 after S16 step according to AC-3 around signal handler with test data decode.
The S18 step of S17 after the step determines whether the decoded result in S17 step is consistent with correct decoded result information.When the decoded result in S17 step was consistent with correct decoded result information, the operation of personal computer 6 went on foot from S18 and proceeds to S19 and go on foot.Otherwise the operation of personal computer 6 proceeds to S20 from the S18 step and goes on foot.
S19 step program is called in mark and is set to " 1 ".S19 is after the step, and program is back to the S11 step.
S20 step control display (not shown) is in order to illustrate " can not play " on display.After step, the operation of personal computer 6 stops at S20.
District 7e is introduced in S21 step visit second, and therefrom reads the 2nd TOC information.S21 step is according to the 2nd TOC message reference second data field 7e, and sense data (around the source) therefrom.
Whether an EOF (file termination) signal appears in the data that the S22 step of S21 after the step determined to read from the second data field 7e.When the EOF signal occurred, the operation of personal computer 6 was withdrawed from from the S22 step, termination then.Otherwise the operation of personal computer 6 goes on foot from S22 and proceeds to piece S23.
The data decode that piece S23 reads the S21 step is 5 channel data sections, and around signal handler 5 channel data sections is converted to 2 channel data sections according to AC-3.Piece 5 among piece S23 correspondence and Fig. 9 and Figure 10.
The S24 step after the piece S23 transfers to audio interface 6d (referring to Fig. 7) with 2 channel data sections.Audio interface 6d is converted to corresponding 2 vocal tract analog signals respectively with 2 channel data sections, and 2 vocal tract analog signals are inputed to loud speaker 3L and 3R respectively.
The 5th embodiment
Except the design that will illustrate hereinafter changed, the fifth embodiment of the present invention and its 3rd embodiment were similar.
With reference to Figure 13, the network terminal 5 (referring to Fig. 7) comprises a reception buffer T1, a transmission buffer device T2, an adapter T3, a data transducer T4, a controller T5, a communication terminal T6.Reception buffer T1 and transmission buffer device T2 in personal computer 6 data converter T4 and bus between link to each other (referring to Fig. 7).Data converter T4 links to each other with communication terminal T6 via adapter T3.Communication terminal T6 links to each other with communication network NW such as Internet or CATV net.Controller T5 and reception buffer T1, transmission buffer device T2, adapter T3, data converter T4, and communication terminal T6 links to each other.Controller T5 is in order to control reception buffer T1, transmission buffer device T2, adapter T3, data converter T4, and communication terminal T6.
Controller T5 comprises a microcomputer, a digital signal processor, or a kind ofly have an input/output end port, a processing unit, the similar equipment of a ROM and a RAM combination.Controller T5 operates according to the control program that is stored among the ROM.
Personal computer 6 (referring to Fig. 7) can be read AC-3 around signal handler (referring to Fig. 7) via CD drive 4 from CD.Personal computer 6 can be transferred to communication network NW with AC-3 around signal handler via the network terminal 5.
Figure 14 is the flow chart of one section control program of controller T5, and this section program relates to AC-3 is transferred to communication network NW around signal handler.With reference to Figure 14, the first step S41 of control program section is transferred to data converter T4 with AC-3 around signal handler via transmission buffer device T2.S41 step control data transducer T4, thereby with a grouping of representing AC-3 to be divided into equal in length around the bit sequence of signal handler.
The S42 step that goes on foot afterwards immediately following S41 produces a header that comprises purpose information for each grouping.S42 step control data transducer T4, thus header is added in the grouping respectively.Thus, produced a stream of packets that is added with header.
S42 step after the S43 step control adapter T3 and communication terminal T6, thereby the stream of packets that will be added with header is transferred to communication network NW via adapter T3 and communication terminal T6 from data converter T4.S43 step control adapter T3 is to carry out and communication protocol to side communication.S43 is after the step, and the control program section stops.
Personal computer 6 (referring to Fig. 7) can receive AC-3 around signal handler (referring to Fig. 7) from communication network NW via the network terminal 5.
Figure 15 is the flow chart of one section control program of controller T5, and this section program relates to from communication network NW reception AC-3 around signal handler.Represent that with one AC-3 is transferred to data converter T4 around the stream of packets that is added with header of signal handler from communication network NW via communication terminal T6 and adapter T3.With reference to Figure 15, the first step S51 control data transducer T4 of control program section, thus header is removed from grouping respectively.
The S52 step control data transducer T4 of S51 after the step, thus the branch that will not have header is combined into the bit sequence of an expression AC-3 around signal handler.
S53 step control data transducer T4 and the reception buffer T1 of S52 after the step, thereby AC-3 is transferred to RAM in the personal computer 6 around the bit sequence of signal handler from data converter T4 via reception buffer T1, for example, the RAM (referring to Fig. 7) in the CPU 6a.
The 6th embodiment
With reference to Figure 16, a digital AC-3 is imported DVD (digital optic disk) encoder 34 around signal.DVD encoder 34 is the signal of DVD form around signal encoding with digital AC-3.Output DVD format signal is to modulation circuit 35A from DVD encoder 34.The DVD format signal submits to modulation circuit 35A, with thinking the record modulation.Modulation circuit 35A output modulation composite signal is to CD drive 35B.CD drive 35B will modulate composite signal and be recorded on the recording medium 35C, for example a DVD or a kind of master record medium.
With reference to Figure 17, CD drive 37A is from such as reproducing signal the recording medium 35C of DVD.CD drive 37A output reproducing signal is to demodulator circuit 37B.Demodulator circuit 37B is demodulated into reproducing signal the signal of DVD form.Demodulator circuit 37B output DVD format signal is to DVD decoder 38.DVD decoder 38 is decoded as digital AC-3 around signal with the DVD format signal.The digital AC-3 of DVD decoder 38 output around signal to Fig. 1 in identical AC-3 decoder 1.
AC-3 decoder 1 is a left signal L with digital AC-3 around signal decoding, a right signal R, a center signal C, a left surround signal SL and a right surround signal SR.AC-3 decoder 1 is left signal L, right signal R, center signal C, left surround signal SL, with right surround signal SR export to Fig. 1 in identical signal processing circuit 2.Signal processing circuit 2 is left signal L, right signal R, and center signal C, left surround signal SL and right surround signal SR are converted to 2 sound channel signals.Signal processing circuit 2 exports 2 sound channel signals to loud speaker 3L and 3R respectively.
The 7th embodiment
With reference to Figure 18, with a digital AC-3 around identical AC-3 decoder 1 among signal input and Fig. 1.AC-3 decoder 1 is a left signal L with digital AC-3 around signal decoding, a right signal R, a center signal C, a left surround signal SL and a right surround signal SR.AC-3 decoder 1 is left signal L, right signal R, center signal C, left surround signal SL, with right surround signal SR export to Fig. 1 in identical signal processing circuit 2.Signal processing circuit 2 is left signal L, right signal R, and center signal C, left surround signal SL and right surround signal SR are converted to 2 sound channel signals.Signal processing circuit 2 outputs 2 vocal tract analog signals.
Immediately following after signal processing circuit 2, being an A/D converter 31.A/D converter 31 receives 2 vocal tract analog signals, and is corresponding 2 sound channel digital signals with 2 vocal tract analog conversion of signals.A/D converter 31 outputs 2 sound channel digital signals are to multiplexer 32.Multiplexer 32 synthesizes a single digital signal with 2 sound channel digital signals.The single digital signal of multiplexer 32 outputs.
After multiplexer 32 is a DVD (digital optic disk) encoder 34.The output signal of multiplexer 32 is encoded to the signal of DVD form by DVD encoder 34.Export the DVD format signals to modulation circuit 35A from DVD encoder 34.The DVD format signal submits to modulation circuit 35A, with thinking the record modulation.Modulation circuit 35A output modulation composite signal is to CD drive 35B.CD drive 35B will modulate composite signal and be recorded on the recording medium 35C, for example a DVD or a kind of master record medium.
With reference to Figure 19, CD drive 37A is from such as reproducing signal the recording medium 35C of DVD.CD drive 37A output reproducing signal is to demodulator circuit 37B.Demodulator circuit 37B is demodulated into reproducing signal the signal of DVD form.Demodulator circuit 37B output DVD format signal is to DVD decoder 38.DVD decoder 38 is decoded as multiplexing composite signal with the DVD format signal.The multiplexing composite signal of DVD decoder 38 outputs is to demodulation multiplexer 39.Demodulation multiplexer 39 is divided into 2 sound channel digital signals with multiplexing composite signal.Demodulation multiplexer 39 outputs 2 sound channel digital signals are to D/A converter 40.D/A converter 40 becomes corresponding 2 vocal tract analog signals with 2 sound channel digital signals.D/A converter 40 exports 2 vocal tract analog signals to loud speaker 3L and 3R respectively.
The 8th embodiment
With reference to Figure 20, with bit sequence input DVD (digital optic disk) encoder 34 of an expression AC-3 around signal handler.For example, receive the bit sequence of AC-3 via people's computer one by one from a communication network around signal handler.AC-3 is encoded to the signal of DVD form by DVD encoder 34 around signal handler.Export the DVD format signal to modulation circuit 35A from DVD encoder 34.The DVD format signal submits to modulation circuit 35A, with thinking the record modulation.Modulation circuit 35A output modulation composite signal is to CD drive 35B.CD drive 35B will modulate composite signal and be recorded on the recording medium 35C, for example a DVD or a kind of master record medium.In this way, AC-3 is recorded on the recording medium 35C around the information of signal handler.
With reference to Figure 21, CD drive 37A is from such as reproducing signal the recording medium 35C of DVD.CD drive 37A output reproducing signal is to demodulator circuit 37B.Demodulator circuit 37B is demodulated into reproducing signal the signal of DVD form.Demodulator circuit 37B output DVD format signal is to DVD decoder 38.DVD decoder 38 is decoded as the bit sequence of an expression AC-3 around signal handler with the DVD format signal.DVD decoder 38 output AC-3 are around the bit sequence of signal handler.Can AC-3 be transferred to communication network around the bit sequence of signal handler via personal computer.
The 9th embodiment
Shown in Figure 22 is the ninth embodiment of the present invention, and except the design that will illustrate hereinafter changed, present embodiment and the 3rd embodiment were similar.The embodiment of Figure 22 has adopted SDDS (Sony's dynamic digital sound) decoder 1A to replace the AC-3 decoder 1 among Fig. 1.
SDDS decoder 1A receives the input with SDDS form and counts audio signal, and with a kind of known way this input audio signal is decoded as a left signal L, a right signal R, a center signal C, a left surround signal SL, a right surround signal SR and one bass signal.
It should be noted that and to replace SDDS decoder 1A with DTS (digital theater sound) decoder.
The tenth embodiment
Shown in Figure 23 for being the tenth embodiment of the present invention, except the design that will illustrate hereinafter changed, present embodiment and the 3rd embodiment were similar.The embodiment of Figure 23 has adopted SDDS (Sony's dynamic digital sound) decoder 1A to replace the AC-3 decoder 1 among Fig. 5.
SDDS decoder 1A receives the input with SDDS form and counts audio signal, and with a kind of known way this input audio signal is decoded as a left signal L, a right signal R, a center signal C, a left surround signal SL, a right surround signal SR and one bass signal.
It should be noted that and to replace SDDS decoder 1A with DTS (digital theater sound) decoder.
The 11 embodiment
Except the design that will illustrate hereinafter changed, the 11st embodiment of the present invention and the 3rd embodiment were similar.The 11st embodiment of the present invention is moved a kind of SDDS around signal handler, but not AC-3 is around signal handler.
Piece S5A of 11st embodiment of the present invention employing replaces the piece S5 among Fig. 9.As shown in figure 24, the sequence of steps of piece S5A is S31A, S32A, S33A and S34A step.First step S31A among the piece S5A with a kind of known by SDDS around the given method of signal handler based on " SDDS ", be 5 channel data sections with the data decode of reading.This 5 channel data Duan Weiyi left data segment, a right data segment, a centre data section, left side around data segment and a right side around data segment.The S31A step is corresponding with the SDDS decoder 1A among Figure 22.
, closely follow the S32 step of S31A after the step left side is carried out Filtering Processing around the data segment and the right side around data segment, around signal handler according to SDDS in order to acoustic image is positioned at rearward position about listener's symmetry.Filter 21a among S32 step and Figure 22,21b, 21c is corresponding with 21d.
Around signal handler, make the centre data section obey the processing that is equivalent to the 3dB decay according to SDDS in the S33 step of S32 after the step.The S33 step is with left data segment and the synthetic centre data section summation of decay.The S33 step is with right data segment and the synthetic centre data section summation of decay.Attenuator 21e among S33 step and Figure 22 and adder 21f and 21g are corresponding.
Around signal handler, the data segment summation that data segment that the S32 step is produced immediately following the step of the S34 after S33 step and S33 step produce also synthesizes 2 channel data sections according to SDDS.The S34 step is corresponding with adder 21h and 21i among Figure 22.
It should be noted that and to replace SDDS around signal handler with DTS around signal handler.
The 12 embodiment
Except the design that will illustrate hereinafter changed, the 12nd embodiment of the present invention and the 4th embodiment were similar.The 12nd embodiment of the present invention handle a kind of SDDS around signal handler or DTS around signal handler, but not AC-3 is around signal handler.
The 13 embodiment
Except the design that will illustrate hereinafter changed, the 13rd embodiment of the present invention and the 5th embodiment were similar.The 13rd embodiment of the present invention handle a kind of SDDS around signal handler or DTS around signal handler, but not AC-3 is around signal handler.
The 14 embodiment
Except the design that will illustrate hereinafter changed, the 14th embodiment of the present invention and the 6th embodiment were similar.The 14th embodiment of the present invention handle a kind of SDDS around signal handler or DTS around signal handler, but not AC-3 is around signal handler.
The 15 embodiment
Except the design that will illustrate hereinafter changed, the 15th embodiment of the present invention and the 7th embodiment were similar.The 15th embodiment of the present invention adopts a kind of SDDS decoder or DTS decoder, but not the AC-3 decoder 1 among Figure 18.The 15th embodiment of the present invention handle a kind of SDDS around signal or DTS around signal, but not AC-3 is around signal.
The 16 embodiment
Except the design that will illustrate hereinafter changed, the 16th embodiment of the present invention and the 8th embodiment were similar.The 16th embodiment of the present invention handle a kind of SDDS around signal handler or DTS around signal handler, but not AC-3 is around signal handler.
Claims (22)
1. one kind around signal processing system, comprising:
In order to receive first device around signal;
In order to receive second device of a kind of processing around the program of signal;
What first device is received in order to the program that receives according to second device is the 3rd device of multi-channel signal around signal decoding, and described multi-channel signal comprises a left surround signal and a right surround signal;
The multi-channel signal of the 3rd device generation is converted to the 4th device of binaural signal in order to the program that receives according to second device;
A pair of loud speaker; And
Be transferred to this 5th device respectively in order to the binaural signal that the 4th device is produced to loud speaker;
Wherein the 4th device comprises the filter that the left surround signal that the 3rd device produced in order to the program that receives according to second device and right surround signal carry out Filtering Processing, so that left surround signal and right surround signal are converted to the filtering composite signal, when this Filtering Processing is designed to only to use preposition loud speaker lacking rearmounted loud speaker, acoustic image is positioned at rear positions with listener's symmetry, and described the 4th device also comprises in order to produce the device of binaural signal based on the filtering composite signal; And
Wherein filter comprises that described acoustic convolver has filter coefficient H1 and the Hr that is provided with based on following transfer function in order to handle the acoustic convolver of left surround signal and right surround signal:
H1＝(SF-AK)/(S2-A2)
The transfer function of " S " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at each loud speaker homonymy ear in Hr=(SK-AF)/(S2-A2) formula; The transfer function of " A " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at the relative side of each loud speaker ear; " F " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at each loud speaker homonymy ear from needs; And " K " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at the relative side of each loud speaker ear from needs.
2. as claimed in claim 1 around signal processing system, wherein second device comprises a CD drive in order to read routine from a kind of recording disk.
3. as claimed in claim 1 around signal processing system, wherein second device comprises a terminal equipment that links to each other with communication network, in order to reception program from this communication network.
4. one kind in order to handle the method around signal, comprises step:
Receive one around signal;
Receive the program of a processing around signal;
What will receive according to the program that receives is multi-channel signal around signal decoding, and this multi-channel signal comprises a left surround signal and a right surround signal;
According to the program that receives multi-channel signal is converted to binaural signal;
Binaural signal is transferred to a pair of loud speaker respectively;
Wherein switch process comprises the filter step of left surround signal and right surround signal being carried out Filtering Processing according to the program that receives, so that left surround signal and right surround signal are converted to the filtering composite signal, when this Filtering Processing is designed to only to use preposition loud speaker lacking rearmounted loud speaker, acoustic image is positioned at rear positions with listener's symmetry, and described switch process also comprises in order to produce the step of binaural signal based on the filtering composite signal; And
Wherein filter step provides in order to handle the acoustic convolver of left surround signal and right surround signal, and described acoustic convolver has filter coefficient H1 and the Hr that is provided with based on following transfer function:
H1＝(SF-AK)/(S2-A2)
The transfer function of " S " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at each loud speaker homonymy ear in Hr=(SK-AF)/(S2-A2) formula; The transfer function of " A " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at the relative side of each loud speaker ear; " F " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at each loud speaker homonymy ear from needs; And " K " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at the relative side of each loud speaker ear from needs.
5. method as claimed in claim 4, wherein the program receiving step comprises the step of read routine from a recording disk.
6. method as claimed in claim 4, wherein the program receiving step comprises the step of the program that receives from a kind of communication network.
7. transmission system that is used for around signal handler comprises:
In order to store first device of a kind of processing around the program of signal, this program comprises in order to will being the step of multi-channel signal around signal decoding, this multi-channel signal comprises a left surround signal and a right surround signal, and in order to left surround signal and right surround signal are carried out the filter step of Filtering Processing, so that left surround signal and right surround signal are converted to the filtering composite signal, when this Filtering Processing is designed to only to use preposition loud speaker lacking rearmounted loud speaker, acoustic image is positioned at rear positions with listener's symmetry;
The terminal equipment that links to each other with a communication network; And
Install second device that links to each other with terminal equipment with first, in order to program is transferred to communication network via terminal equipment from first device;
Wherein filter step provides in order to handle the acoustic convolver of left surround signal and right surround signal, and described acoustic convolver has filter coefficient H1 and the Hr that is provided with based on following transfer function:
H1＝(SF-AK)/(S2-A2)
The transfer function of " S " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at each loud speaker homonymy ear in Hr=(SK-AF)/(S2-A2) formula; The transfer function of " A " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at the relative side of each loud speaker ear; " F " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at each loud speaker homonymy ear from needs; And " K " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at the relative side of each loud speaker ear from needs.
8. receiving system that is used for around signal handler comprises:
The terminal equipment that links to each other with a communication network; And
The device that links to each other with terminal equipment is in order to receive program via terminal equipment from communication network;
Wherein this program comprises in order to will being the step of multi-channel signal around signal decoding, this multi-channel signal comprises a left surround signal and a right surround signal, and in order to left surround signal and right surround signal are carried out the filter step of Filtering Processing, so that left surround signal and right surround signal are converted to the filtering composite signal, when this Filtering Processing is designed to only to use preposition loud speaker lacking rearmounted loud speaker, acoustic image is positioned at rear positions with listener's symmetry;
Wherein filter step provides in order to handle the acoustic convolver of left surround signal and right surround signal, and described acoustic convolver has filter coefficient H1 and the Hr that is provided with based on following transfer function:
H1＝(SF-AK)/(S2-A2)
The transfer function of " S " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at each loud speaker homonymy ear in Hr=(SK-AF)/(S2-A2) formula; The transfer function of " A " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at the relative side of each loud speaker ear; " F " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at each loud speaker homonymy ear from needs; And " K " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at the relative side of each loud speaker ear from needs.
9. tape deck that is used for around signal comprises:
In order to being first device of multi-channel signal around signal decoding, this multi-channel signal comprises a left surround signal and a right surround signal;
Be converted to second device of binaural signal in order to the multi-channel signal that first device is produced; And
In order to second binaural signal of installing generation is recorded in the 3rd device on the recording medium;
Wherein second device comprises the filter that carries out Filtering Processing in order to left surround signal and right surround signal to the first device generation, so that left surround signal and right surround signal are converted to the filtering composite signal, when this Filtering Processing is designed to only to use preposition loud speaker lacking rearmounted loud speaker, acoustic image is positioned at rear positions with listener's symmetry, and described second device also comprises in order to produce the device of binaural signal based on the filtering composite signal;
Wherein filter step provides in order to handle the acoustic convolver of left surround signal and right surround signal, and described acoustic convolver has filter coefficient H1 and the Hr that is provided with based on following transfer function:
H1＝(SF-AK)/(S2-A2)
The transfer function of " S " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at each loud speaker homonymy ear in Hr=(SK-AF)/(S2-A2) formula; The transfer function of " A " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at the relative side of each loud speaker ear; " F " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at each loud speaker homonymy ear from needs; And " K " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at the relative side of each loud speaker ear from needs.
10. a record comprises step around the method for signal:
To be multi-channel signal around signal decoding, this multi-channel signal comprises a left surround signal and a right surround signal;
Multi-channel signal is converted to binaural signal; And
Binaural signal is recorded on a kind of recording medium;
Wherein switch process comprises in order to left surround signal and right surround signal are carried out the filter step of Filtering Processing, so that left surround signal and right surround signal are converted to the filtering composite signal, when this Filtering Processing is designed to only to use preposition loud speaker lacking rearmounted loud speaker, acoustic image is positioned at rear positions with listener's symmetry, and described switch process also comprises in order to produce the step of binaural signal based on the filtering composite signal;
Wherein filter step provides in order to handle the acoustic convolver of left surround signal and right surround signal, and described acoustic convolver has filter coefficient H1 and the Hr that is provided with based on following transfer function:
H1＝(SF-AK)/(S2-A2)
The transfer function of " S " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at each loud speaker homonymy ear in Hr=(SK-AF)/(S2-A2) formula; The transfer function of " A " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at the relative side of each loud speaker ear; " F " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at each loud speaker homonymy ear from needs; And " K " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at the relative side of each loud speaker ear from needs.
11. a tape deck that is used for around signal handler, comprising:
In order to being encoded to a kind of first device around signal handler with coding composite signal of the form that is suitable for writing down;
Be recorded in the device of second on a kind of carrier in order to the coding composite signal that first device is produced;
Wherein comprise in order to will being the step of multi-channel signal around signal decoding around signal handler, this multi-channel signal comprises a left surround signal and a right surround signal, and in order to left surround signal and right surround signal are carried out the filter step of Filtering Processing, so that left surround signal and right surround signal are converted to the filtering composite signal, when this Filtering Processing is designed to only to use preposition loud speaker lacking rearmounted loud speaker, acoustic image is positioned at rear positions with listener's symmetry;
Wherein filter step provides in order to handle the acoustic convolver of left surround signal and right surround signal, and described acoustic convolver has filter coefficient H1 and the Hr that is provided with based on following transfer function:
H1＝(SF-AK)/(S2-A2)
The transfer function of " S " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at each loud speaker homonymy ear in Hr=(SK-AF)/(S2-A2) formula; The transfer function of " A " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at the relative side of each loud speaker ear; " F " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at each loud speaker homonymy ear from needs; And " K " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at the relative side of each loud speaker ear from needs.
12. one kind around signal processing system, comprising:
In order to receive first device around signal;
In order to receive second device of a kind of processing around the program of signal;
What first device is received in order to the program that receives according to second device is the 3rd device of multi-channel signal around signal decoding, and this multi-channel signal comprises a left surround signal and a right surround signal;
The multi-channel signal of the 3rd device generation is converted to the 4th device of binaural signal in order to the program that receives according to second device;
A pair of loud speaker; And
Be transferred to this 5th device respectively in order to the binaural signal that the 4th device is produced to loud speaker;
Wherein the 4th device comprises the filter that the left surround signal that the 3rd device produced in order to the program that receives according to second device and right surround signal carry out Filtering Processing, so that left surround signal and right surround signal are converted to the filtering composite signal, when this Filtering Processing is designed to only to use preposition loud speaker lacking rearmounted loud speaker, acoustic image is positioned at rear positions with listener's symmetry, and described the 4th device also comprises in order to produce the device of binaural signal based on the filtering composite signal; And
Wherein filter comprises in order to left surround signal and right surround signal are added up to the adder of addition results signal, subtracter in order to the subtraction result signal of the difference that generates expression left surround signal and right surround signal, in order to handle first filter of addition results signal, and in order to handle second filter of subtraction result signal, first filter and second filter have filter coefficient P and the N that is provided with based on following transfer function respectively:
P＝(F+K)/(S+A)
The transfer function of " S " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at each loud speaker homonymy ear in N=(F-K)/(S-A) formula; The transfer function of " A " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at the relative side of each loud speaker ear; " F " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at each loud speaker homonymy ear from needs; And " K " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at the relative side of each loud speaker ear from needs.
13. as claimed in claim 12 around signal processing system, wherein second device comprises a CD drive in order to read routine from a kind of recording disk.
14. as claimed in claim 12 around signal processing system, wherein second device comprises a terminal equipment that links to each other with communication network, in order to reception program from this communication network.
15. one kind in order to handle the method around signal, comprises step:
Receive one around signal;
Receive the program of a processing around signal;
What will receive according to the program that receives is multi-channel signal around signal decoding, and this multi-channel signal comprises a left surround signal and a right surround signal;
According to the program that receives multi-channel signal is converted to binaural signal; And
Binaural signal is transferred to a pair of loud speaker respectively;
Wherein switch process comprises the filter step of left surround signal and right surround signal being carried out Filtering Processing according to the program that receives, so that left surround signal and right surround signal are converted to the filtering composite signal, when this Filtering Processing is designed to only to use preposition loud speaker lacking rearmounted loud speaker, acoustic image is positioned at rear positions with listener's symmetry, and described switch process also comprises in order to produce the step of binaural signal based on the filtering composite signal; And
Wherein filter step comprises in order to left surround signal and right surround signal are added up to the step of addition results signal, step in order to the subtraction result signal of the difference that generates expression left surround signal and right surround signal, in order to handle the first sub-filter step of addition results signal, and in order to handle the second sub-filter step of subtraction result signal, the first and second sub-filter step provide filter coefficient P and the N that is provided with based on following transfer function respectively:
P＝(F+K)/(S+A)
The transfer function of " S " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at each loud speaker homonymy ear in N=(F-K)/(S-A) formula; The transfer function of " A " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at the relative side of each loud speaker ear; " F " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at each loud speaker homonymy ear from needs; And " K " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at the relative side of each loud speaker ear from needs.
16. method as claimed in claim 15, wherein the program receiving step comprises the step of read routine from recording disk.
17. method as claimed in claim 15, wherein the program receiving step comprises the step of the program that receives from communication network.
18. a transmission system that is used for around signal handler comprises:
In order to store first device of a kind of processing around the program of signal, this program comprises in order to will being the step of multi-channel signal around signal decoding, this multi-channel signal comprises a left surround signal and a right surround signal, and in order to left surround signal and right surround signal are carried out the filter step of Filtering Processing, so that left surround signal and right surround signal are converted to the filtering composite signal, when this Filtering Processing is designed to only to use preposition loud speaker lacking rearmounted loud speaker, acoustic image is positioned at rear positions with listener's symmetry;
The terminal equipment that links to each other with a communication network; And
Install second device that links to each other with terminal equipment with first, in order to program is transferred to communication network via terminal equipment from first device;
Wherein filter step comprises in order to left surround signal and right surround signal are added up to the step of addition results signal, step in order to the subtraction result signal of the difference that generates expression left surround signal and right surround signal, in order to handle the first sub-filter step of addition results signal, and in order to handle the second sub-filter step of subtraction result signal, the first and second sub-filter step provide filter coefficient P and the N that is provided with based on following transfer function respectively:
P＝(F+K)/(S+A)
The transfer function of " S " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at each loud speaker homonymy ear in N=(F-K)/(S-A) formula; The transfer function of " A " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at the relative side of each loud speaker ear; " F " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at each loud speaker homonymy ear from needs; And " K " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at the relative side of each loud speaker ear from needs
19. a receiving system that is used for around signal handler comprises:
The terminal equipment that links to each other with a communication network; And
The device that links to each other with terminal equipment is in order to receive a program via terminal equipment from communication network;
Wherein this program comprises in order to will being the step of multi-channel signal around signal decoding, this multi-channel signal comprises a left surround signal and a right surround signal, and in order to left surround signal and right surround signal are carried out the filter step of Filtering Processing, so that left surround signal and right surround signal are converted to the filtering composite signal, when this Filtering Processing is designed to only to use preposition loud speaker lacking rearmounted loud speaker, acoustic image is positioned at rear positions with listener's symmetry;
Wherein filter step comprises in order to left surround signal and right surround signal are added up to the step of addition results signal, step in order to the subtraction result signal of the difference that generates expression left surround signal and right surround signal, in order to handle the first sub-filter step of addition results signal, and in order to handle the second sub-filter step of subtraction result signal, the first and second sub-filter step provide filter coefficient P and the N that is provided with based on following transfer function respectively:
P＝(F+K)/(S+A)
The transfer function of " S " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at each loud speaker homonymy ear in N=(F-K)/(S-A) formula; The transfer function of " A " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at the relative side of each loud speaker ear; " F " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at each loud speaker homonymy ear from needs; And " K " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at the relative side of each loud speaker ear from needs.
20. a tape deck that is used for around signal comprises:
In order to being first device of multi-channel signal around signal decoding, this multi-channel signal comprises a left surround signal and a right surround signal;
Be converted to second device of binaural signal in order to the multi-channel signal that first device is produced; And
In order to second binaural signal of installing generation is recorded in the 3rd device on the recording medium;
Wherein second device comprises the filter that carries out Filtering Processing in order to left surround signal and right surround signal to the first device generation, so that left surround signal and right surround signal are converted to the filtering composite signal, when this Filtering Processing is designed to only to use preposition loud speaker lacking rearmounted loud speaker, acoustic image is positioned at rear positions with listener's symmetry, and described second device also comprises in order to produce the device of binaural signal based on the filtering composite signal;
Wherein filter step comprises in order to left surround signal and right surround signal are added up to the step of addition results signal, step in order to the subtraction result signal of the difference that generates expression left surround signal and right surround signal, in order to handle the first sub-filter step of addition results signal, and in order to handle the second sub-filter step of subtraction result signal, the first and second sub-filter step provide filter coefficient P and the N that is provided with based on following transfer function respectively:
P＝(F+K)/(S+A)
The transfer function of " S " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at each loud speaker homonymy ear in N=(F-K)/(S-A) formula; The transfer function of " A " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at the relative side of each loud speaker ear; " F " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at each loud speaker homonymy ear from needs; And " K " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at the relative side of each loud speaker ear from needs.
21. a record comprises step around the method for signal:
To be multi-channel signal around signal decoding, this multi-channel signal comprises a left surround signal and a right surround signal;
Multi-channel signal is converted to binaural signal; And
Binaural signal is recorded on a kind of recording medium;
Wherein second device comprises the filter that carries out Filtering Processing in order to left surround signal and right surround signal to the first device generation, so that left surround signal and right surround signal are converted to the filtering composite signal, when this Filtering Processing is designed to only to use preposition loud speaker lacking rearmounted loud speaker, acoustic image is positioned at rear positions with listener's symmetry, and described second device also comprises in order to produce the device of binaural signal based on the filtering composite signal;
Wherein filter comprises in order to left surround signal and right surround signal are added up to the adder of addition results signal, subtracter in order to the subtraction result signal of the difference that generates expression left surround signal and right surround signal, in order to handle first filter of addition results signal, and in order to handle second filter of subtraction result signal, first filter and second filter have filter coefficient P and the N that is provided with based on following transfer function respectively:
P＝(F+K)/(S+A)
The transfer function of " S " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at each loud speaker homonymy ear in N=(F-K)/(S-A) formula; The transfer function of " A " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at the relative side of each loud speaker ear; " F " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at each loud speaker homonymy ear from needs; And " K " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at the relative side of each loud speaker ear from needs.
22. a tape deck that is used for around signal handler, comprising:
In order to being encoded to a kind of first device around signal handler with coding composite signal of the form that is suitable for writing down; And
Be recorded in the device of second on a kind of carrier in order to the coding composite signal that first device is produced;
Wherein comprise in order to will being the step of multi-channel signal around signal decoding around signal handler, this multi-channel signal comprises a left surround signal and a right surround signal, and in order to left surround signal and right surround signal are carried out the filter step of Filtering Processing, so that left surround signal and right surround signal are converted to the filtering composite signal, when this Filtering Processing is designed to only to use preposition loud speaker lacking rearmounted loud speaker, acoustic image is positioned at rear positions with listener's symmetry; And
Wherein filter step comprises in order to left surround signal and right surround signal are added up to the step of addition results signal, step in order to the subtraction result signal of the difference that generates expression left surround signal and right surround signal, in order to handle the first sub-filter step of addition results signal, and in order to handle the second sub-filter step of subtraction result signal, the first and second sub-filter step provide filter coefficient P and the N that is provided with based on following transfer function respectively:
P＝(F+K)/(S+A)
The transfer function of " S " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at each loud speaker homonymy ear in N=(F-K)/(S-A) formula; The transfer function of " A " expression from each loud speaker of a pair of loud speaker to each listener's who is positioned at the relative side of each loud speaker ear; " F " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at each loud speaker homonymy ear from needs; And " K " expression is located the transfer function of the position of each acoustic image to each listener's who is positioned at the relative side of each loud speaker ear from needs.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP145862/1997 | 1997-05-20 | ||
| JP9145862A JPH10136499A (en) | 1996-09-04 | 1997-05-20 | Surround signal processing method, image and sound reproducing method, surround signal processor, surround signal processing program recorded recording medium, method for transmitting and receiving processing program, method, device and medium for recording to recording medium, and method for transmitting and receiving recorded data |
| JP145862/97 | 1997-05-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1200009A CN1200009A (en) | 1998-11-25 |
| CN1139300C true CN1139300C (en) | 2004-02-18 |
Family
ID=15394793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB981043356A Expired - Lifetime CN1139300C (en) | 1997-05-20 | 1998-01-20 | System for processing audio surround signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1139300C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4887420B2 (en) * | 2006-03-13 | 2012-02-29 | ドルビー ラボラトリーズ ライセンシング コーポレイション | Rendering center channel audio |
| US8126152B2 (en) * | 2006-03-28 | 2012-02-28 | Telefonaktiebolaget L M Ericsson (Publ) | Method and arrangement for a decoder for multi-channel surround sound |
| CN101695151B (en) * | 2009-10-12 | 2011-12-21 | 清华大学 | Method and equipment for converting multi-channel audio signals into dual-channel audio signals |
| CN107968984B (en) * | 2016-10-20 | 2019-08-20 | 中国科学院声学研究所 | A kind of 5-2 channel audio conversion optimization method |
-
1998
- 1998-01-20 CN CNB981043356A patent/CN1139300C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1200009A (en) | 1998-11-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1287633C (en) | Sound image localizer | |
| CN1248223C (en) | Information signal representing apparatus | |
| CN1148995C (en) | Audible signal processing circuit | |
| CN1052129C (en) | Image pickup parameter recorder, image pickup method, and editing system | |
| CN1278332C (en) | DVD disc, device and method for reproducing same | |
| CN1192381C (en) | Data management apparatus, data management method, and record medium recording data management program | |
| CN1311622A (en) | Head ear-phone system | |
| CN101035339A (en) | System and method for outputting data | |
| CN1130719C (en) | Mutli-channel voice frequency reproduction equipment | |
| CN1694580A (en) | Measuring apparatus and method, and recording medium | |
| CN1427987A (en) | Method and apparatus for adapting primary content of audio and remaining portion of audio content in digital audio production process | |
| CN1175056A (en) | Information recording medium and recording and reproducting device thereof | |
| CN1658709A (en) | Sound reproduction apparatus and sound reproduction method | |
| CN1691765A (en) | Information processing apparatus, imaging apparatus, information processing method, and program | |
| CN1287767A (en) | Surround-sound processing system | |
| US6052470A (en) | System for processing audio surround signal | |
| CN1765154A (en) | Acoustic processing device | |
| CN1852623A (en) | Virtual sound localization processing apparatus, virtual sound localization processing method, and recording medium | |
| CN1214588C (en) | Transmission method, transmission device and transmission system | |
| CN1139300C (en) | System for processing audio surround signal | |
| CN1151559A (en) | Information supplying device | |
| CN101030990A (en) | Echo prevention circuit, filter coefficient setting method, and program | |
| CN1165046C (en) | Data transfer apparatus, data transfer system, and data transfer method with double buffering | |
| CN1918909A (en) | File recording device, file recording method, file recording method program, recording medium containing program of file recording method, file reproduction device, file reproduction method, file repr | |
| CN1261941C (en) | Recorded medium reproducing device and method, data output controlling method, data outputting method, error detecting method, and data outputting reproducing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: JVC KENWOOD CORPORATION Free format text: FORMER OWNER: VICTORY CO. LTD. Effective date: 20140306 |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20140306 Address after: Kanagawa Patentee after: JVC Kenwood Corp. Address before: Kanagawa, Japan Patentee before: Victory Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20040218 |