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WO1997038553A1 - Systeme acoustique - Google Patents

Systeme acoustique Download PDF

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Publication number
WO1997038553A1
WO1997038553A1 PCT/JP1996/000939 JP9600939W WO9738553A1 WO 1997038553 A1 WO1997038553 A1 WO 1997038553A1 JP 9600939 W JP9600939 W JP 9600939W WO 9738553 A1 WO9738553 A1 WO 9738553A1
Authority
WO
WIPO (PCT)
Prior art keywords
channel
signal
sound
difference
difference signal
Prior art date
Application number
PCT/JP1996/000939
Other languages
English (en)
Japanese (ja)
Inventor
Hitoshi Ishiwata
Original Assignee
City Promotion Network Co., Ltd.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by City Promotion Network Co., Ltd. filed Critical City Promotion Network Co., Ltd.
Priority to PCT/JP1996/000939 priority Critical patent/WO1997038553A1/fr
Priority to EP96908354A priority patent/EP0848572A1/fr
Publication of WO1997038553A1 publication Critical patent/WO1997038553A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/027—Spatial or constructional arrangements of microphones, e.g. in dummy heads
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2205/00—Details of stereophonic arrangements covered by H04R5/00 but not provided for in any of its subgroups
    • H04R2205/022—Plurality of transducers corresponding to a plurality of sound channels in each earpiece of headphones or in a single enclosure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
    • H04S2400/01—Multi-channel, i.e. more than two input channels, sound reproduction with two speakers wherein the multi-channel information is substantially preserved
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
    • H04S2400/15—Aspects of sound capture and related signal processing for recording or reproduction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic

Definitions

  • the present invention relates to a microphone device for collecting a sound from which a reproduced sound rich in a three-dimensional effect and a sense of reality can be obtained, a method for processing a pop sound, and a recording medium on which the sound processed by the device and the method is recorded.
  • a microphone device for collecting a sound from which a reproduced sound rich in a three-dimensional effect and a sense of reality can be obtained
  • a method for processing a pop sound and a recording medium on which the sound processed by the device and the method is recorded.
  • the broadcasting method about the broadcasting method. ⁇ Keigi i'w
  • the sound source is collected by a microphone L and a microphone R as shown in FIG. Then, the sound of the microphone R and the sound of the microphone R are respectively transmitted by the independent transmission system and the transmission system R, and are reproduced from the speaker R and the speaker R, respectively.
  • a quadrature nick method has been proposed as a technique for obtaining a realistic sound reproduction.
  • FIG. 12 is a diagram for explaining the quadratic method.
  • the recording method of the quadrature nick system is a microphone FZF! Located at the front right of the sound source. , Forward left The microphone FZ located at the rear is picked up from four microphones, the microphone RZR located at the rear right and the microphone RZL located at the rear left, to collect four channels.
  • the sounds recorded by the four microphones are transmitted independently by the four transmission channels, respectively, and are reproduced from the four speakers geometrically arranged with the four microphones. It can provide a very realistic sound field.
  • the sound field is not accurately localized, and there is a limit in reproducing a sound field full of a sense of reality.
  • the above quadraphonic method is based on the premise that four channels are collected and four channels are reproduced, but the localization of the sound field is limited.
  • the reproduced sound has no more realistic feeling.
  • the current broadcasting system is generally stereo broadcasting, and there has been no branching technique that can provide realistic sound reproduction even when broadcasting using this stereoscopic broadcasting.
  • an object of the present invention is to solve the above-mentioned problems. It is another object of the present invention to provide a microphone device capable of localizing a sound field to obtain a realistically reproduced sound, and a method and system for processing collected sound.
  • An object of the present invention is to provide a substantially spherical structure, a first microfin element disposed at a left end of the structure and having directivity in at least two directions, and a right end of the structure. And a second microphone element having directivity in at least two directions.
  • the substantially spherical shape in the present invention is not limited to a spherical shape in a mathematical sense, but also includes a shape that can be virtually regarded as a sphere, and other shapes close to an ellipsoid.
  • the substantially spherical structure preferably has a diameter of 10 to 5 Ocm. More preferably, the diameter is 10 to 40 cm, still more preferably, the diameter is ⁇ 0 to 30 cm, and most preferably, the diameter is 15 to 20 cm.
  • the approximately spherical structure is about the same as or slightly larger than the microphone element to which it is attached, the distance between each microphone element becomes short, which makes it difficult to obtain a rarely rich reproduction sound. .
  • the substantially spherical structure becomes too large, the distance between each microphone element becomes large, and each microphone element can pick up sound from the same sound source as one. hard.
  • the substantially spherical structure is made of a material having fine pores.
  • the substantially spherical structure may have a solid structure.However, a structure made of a material having fine pores such as porous ceramics such as pumice or a foamed resin material is more preferable. A playback sound rich in three-dimensional effect was obtained.
  • a substantially spherical structure is provided in a substantially spherical skin, and inside the skin. It is even better if the composite structure has a sound absorbing material inserted therein. Further, it is preferable that the first microphone element and the second microphone element are stereo microphone elements.
  • the microphone element is detachable by providing an arrangement part for disposing the microphone element on the above-mentioned substantially spherical structure, it is convenient when moving.
  • An object of the present invention is to provide a two-channel type first microphone element having directivity in at least two directions at a left end of a substantially spherical structure, and having directivity in at least two directions at a right end.
  • a microphone device provided with a second microphone element of a two-channel type
  • the front channel of the first microphone element is connected to the first channel and the rear channel of the first microphone element.
  • the channel is the second channel
  • the front channel of the second microchannel element is the third channel
  • the rear channel of the second microchannel element is the fourth channel.
  • the sound reproduction method is characterized by having the following.
  • the microphone device reproduces the sound on four channels, and if the sound is reproduced in the same place as the place where the sound was collected, the sound is three-dimensional enough to give an illusion of being at the sound collecting place. Can be played.
  • An object of the present invention is to provide a two-channel type first microphone element having directivity in at least two directions at a left end of a substantially spherical structure, and having directivity in at least two directions at a right end. Having 2 channels Using a microphone device provided with a second microphone element of the type, the front channel of the first microphone element is used as the first channel, and the rear channel of the first microphone element is used. A second channel, a front channel of the second microphone element as a third channel, a rear channel of the second microphone element as a fourth channel, and sound collecting on four channels. Performing a predetermined frequency correction on the signal of the second channel and the signal of the fourth channel;
  • the step of performing the frequency correction includes the second channel (the channel located at the rear left) and the fourth channel (the channel located at the rear right) of the four-channel sound signals collected by the microphone device. It is preferable to correct the frequency so that when the signal is plotted with the sound pressure plotted on the vertical axis and the frequency plotted on the horizontal axis, undulation occurs in the high frequency range. This can be considered as follows. The important thing in the characteristics of human hearing is the judgment of the sound before and after.However, even though the ears are located on the left and right sides of the head, it is possible to judge the positional relationship between the front and rear, because By change.
  • the substantially spherical structure has a diameter of 10 to 50 cm.
  • the object of the present invention is to provide a two-channel type first microphone element having directivity in at least two directions at a left end of a substantially spherical structure, and having directivity in at least two directions at a right end.
  • a microphone device provided with a second microphone element of a two-channel type
  • the front channel of the first microphone element is set to the first channel
  • the rear channel of the first microphone element is set.
  • a second synthesizing step of synthesizing the third channel signal and the frequency-corrected fourth channel signal A first difference signal generation step of subtracting the signal generated in the second synthesis step from the signal generated in the first synthesis step to generate a difference signal; A second difference signal generating step of subtracting the signal generated in the first synthesizing step from the signal thus generated to generate a difference signal; and a difference signal generated in the first difference signal generating step.
  • a second delay step of delaying a predetermined time and generating a plurality of difference signals having different delay times from each other;
  • a third synthesis step of synthesizing the signal generated in the first synthesis step, the difference signal generated in the first difference signal generation step, and the plurality of difference signals generated in the first delay step When,
  • the method of processing collected sounds is characterized by having. This processing method is particularly suitable for the case where the sound collected by the microphone device is reproduced by a stereo-type (2-channel) reproducing device, that is, only two speakers.
  • the delay time of the delay step is preferably 0.5 to 1.0 msec.
  • the delay step may be a step of generating two difference signals of 0.5 msec and 1.0 msec. preferable.
  • the third synthesizing step is a step of calculating a total volume of the difference signal generated in the first difference signal generating step and a plurality of difference signals generated in the first i! 5 process.
  • the difference signal generated in the first difference signal generation step and the plurality of difference signals generated in the first delay step are adjusted so that the volume level does not become larger than the volume level of the signal generated in the first synthesis step. Combining the difference signals and the signal generated in the first combining step.
  • the total volume of the difference signal generated in the second difference signal generation step and the plurality of difference signals generated in the second delay step is calculated.
  • the difference signal generated in the second difference signal generation step, the plurality of difference signals generated in the second delay step, and the second synthesis step are controlled so as not to exceed the volume level of the generated signal.
  • it is a step of synthesizing the generated signals.
  • the difference signal generated in the first difference signal generation step and a plurality of difference signals generated in the first delay step are obtained. If the total volume level of the signal and the signal are combined at 0.3 to 0.8 and the volume level of the signal generated in the second synthesis step is set to 1, the signal is generated in the second difference signal generation step. The sum of the generated difference signals and the plurality of difference signals generated in the second delay process is combined at a volume level of 0.3 to 0.8.
  • a ratio of about 0.6, ie a volume level ratio of the signal generated in the synthesis process to the difference signal and to a plurality of delayed difference signals is 1: 0.6.
  • the sound processed by the above-described processing method is recorded on a recording medium, a stereoscopic sound can be easily enjoyed by a stereo-type playback device. Furthermore, even if the sound processed by the above-described processing method is broadcast in a stereo system, the sound will be full of a three-dimensional effect and a sense of reality.
  • the object of the present invention is that the left front is the first channel and the left rear is the second channel.
  • a channel conversion system that converts the sound collected from four channels into two channels, with the third channel on the right front and the fourth channel on the rear,
  • Frequency correction means for performing a predetermined frequency correction on the signal of the second channel and the signal of the fourth channel;
  • First synthesizing means for synthesizing the first channel signal and the frequency-corrected second channel signal
  • Second synthesizing means for synthesizing the third channel signal and the frequency-corrected fourth channel signal
  • the above-mentioned frequency correction means performs the sound pressure on the vertical axis and the frequency on the horizontal axis for the signal of the second channel and the signal of the fourth channel. It is preferable that the means be a means for correcting the frequency so that undulation occurs in a high frequency range when plotting is performed by using the following method.
  • the frequency correction means has a large drop of about 9 dB from 500 to 110 Hz and a peak of about 3 dB from 2000 to 300 Hz. It is preferable that the frequency characteristic is attenuated from 400 Hz to 160 Hz to the signals of the second channel and the fourth channel.
  • An object of the present invention is a sound signal processing system for processing a sound signal
  • First difference signal generating means for subtracting the second channel signal from the first channel signal to generate a difference signal
  • a second delay means for sequentially delaying the difference signal generated by the first difference signal generation means for a predetermined time to generate a plurality of difference signals having different delay times from each other;
  • Second delay means for sequentially delaying the difference signal generated by the second difference signal generation means for a predetermined time, and generating a plurality of difference signals having different delay times from each other;
  • First combining means for combining the second channel signal, the difference signal generated by the first difference signal generating means, and a plurality of difference signals generated by the first delay means;
  • Second combining means for combining the second channel signal, the difference signal generated by the second difference signal generating means, and the plurality of difference signals generated by the second delay means;
  • the delay time of the first and second delay means is 0.5 to 1.0 Omsec.
  • the first synthesizing means is such that the total volume level of the difference signal generated by the first difference signal generating means and the plurality of difference signals generated by the first itt means is the first level.
  • the difference signal generated by the first difference signal generation means, the plurality of difference signals generated by the first delay means, and the first channel signal are set so as not to become larger than the level of each channel signal. Configured to combine,
  • the second synthesizing unit is configured to set a sum of the difference signal generated by the second difference signal generating unit and the plurality of difference signals generated by the second delay unit to a second channel. Larger than signal volume level It is preferable that the difference signal generated by the second difference signal generation means, the plurality of difference signals generated by the second delay means, and the second channel signal be combined so as not to be lost. More preferably, when the volume level of the first channel signal is set to 1 in the first combining means, the difference signal generated by the first difference signal generating means and the first delay means are generated. And the sum of the volume levels of the plurality of difference signals is 0.3 to 0.8, and the second synthesizing means sets the volume level of the second channel signal to 1.
  • the total volume level of the difference signal generated by the second difference signal generation means and the plurality of difference signals generated by the second delay means is combined in a range of 0.3 to 0.8. It is preferable to configure. Particularly preferred is 0.6.
  • FIG. 1 is a perspective view of a microphone device A according to the present invention
  • FIG. 2 is a plan view of a microphone device A according to the present invention
  • FIG. 3 is a block diagram of a channel conversion system.
  • Figure 4 is a frequency characteristic diagram.
  • FIG. 5 is a block diagram of the sound processing system 100
  • Fig. 6 is a diagram for explaining the operation of the sound processing system 100
  • Fig. 7 is a diagram for explaining the operation of the sound processing system 100
  • Fig. 8 is a microphone device for collecting four channels. This is a diagram for explaining the case where playback is performed on 4 channels.
  • FIG. 9 is a diagram for explaining the case where four channels of sound are collected by a microphone device, this sound is converted to two channels by a channel conversion system, and reproduced by a headphone.
  • FIG. 10 is a diagram for explaining a case where sound is collected using a microphone device and this sound is processed by a channel conversion system and a sound processing system.
  • Fig. 11 is a diagram for explaining the conventional technology.
  • FIG. 12 is a diagram for explaining a conventional technique. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIGS. 1 and 2 show a microphone device A according to the present invention.
  • FIG. 1 is a perspective view
  • FIG. 2 is a plan view.
  • 1 is a sphere having a diameter of 18 cm.
  • the inside of the sphere 1 is made of urethane foam resin, and the outside is made of FRP so as to surround the urethane foam resin. That is, the sphere 1 is composed of a skin FRP formed in the sphere and a urethane foam resin put in the inside thereof.
  • the microphone elements 2a and 2b are stereotype microphone elements. As shown in the figure, the microphone elements 2a and 2b are arranged such that their bases are detachably embedded at both left and right ends of the sphere 1. As can be seen from FIG. 2, the microphone elements 2a and 2b are so arranged that the front left sound and the rear left sound can be picked up by the microphone element 2a. Thus, the sound on the front right and the sound on the rear right can be picked up.
  • FIG. 3 is a block diagram of the channel conversion system.
  • the microphone Of the two channels (stereo) of the headphone element 2a the channel that picks up the sound on the front left is the first channel FZL, and the channel that picks up the sound on the rear left is the second channel RZL.
  • the channel that picks up the right front sound is the third channel FZR, and the channel that picks up the right rear sound is the fourth channel RZR.
  • the equalizer 31 receives the signal of the second channel RZL and the signal of the fourth channel R / R, and receives the signal of the second channel R / L and the signal of the fourth channel RZR.
  • the equalizer 31 receives the signal of the second channel RZL and the signal of the fourth channel R / R, and receives the signal of the second channel R / L and the signal of the fourth channel RZR.
  • the sound of the second channel RZL and the sound of the fourth channel RZR have a large drop of about 9 dB at 500 to 110 Hz, and a valley of 2000 to 300,000. It is corrected so that it has a peak of about 3 dB toward 0 Hz and has a characteristic of attenuating from 400 Hz to 1600 Hz.
  • 3 2 is a second synthesizer that synthesizes the sound of the second channel F / L and the corrected sound of the second channel R / L, and converts it into one channel.
  • 3 3 is a second synthesizer that synthesizes the sound of the third channel FZR and the captured sound of the fourth channel RZR and converts it into one channel. Convert the result to two channels.
  • This channel conversion system is particularly effective when listening to headphones.
  • a description will be given of a sound processing system for processing a two-channel signal to reproduce a sound with a more three-dimensional effect.
  • FIG. 5 is a block diagram of the sound processing system 100.
  • the difference signal generation circuit 51 is a circuit that subtracts the signal of the second channel from the signal of the first channel to generate a difference signal. That is, a matrix signal is generated.
  • This difference signal generation circuit 52 is a second difference signal generation circuit.
  • This difference signal generation circuit 52 is a circuit that subtracts the signal of the first channel from the signal of the second channel to generate a difference signal. That is, a matrix signal is generated.
  • 5 3 to 5 3 n are first delay circuits. Each delay circuit 5 3 ⁇ ⁇ 5 3. , Different thigh times (0.5 msec to 1.0 msec) are set, and the output signal of the difference signal generation circuit 51 is delayed by the set delay time. For example, assuming that a delay time of 0.5 msec is set in the delay circuit 53, the output signal of the difference signal generating circuit ⁇ is output after being delayed by 0.5 msec in the delay circuit 53. You.
  • 5 4 to 5 4 ⁇ are the second delay circuits.
  • the delay circuits 5 4 ⁇ 5 4 eta different times in (0. 5 msec ⁇ 1. 0 msec ) is Bok set, delays the output signal of the differential signal generating circuit 5 2 only set Bok delay time. For example, assuming that a delay time of 0.5 msec is set in the delay circuit 54, the output signal of the difference signal generation circuit 52 is output after being delayed by 0.5 msec in the delay circuit 54. You.
  • the synthesizer 55 is the first synthesizer.
  • the synthesizer 55 includes a signal of the first channel, an output signal of the difference signal generation circuit 51, and delay circuits 53 to 53.
  • the output signals of are synthesized.
  • the combiner 55 generates a difference signal generation circuit 51 when the volume level of the signal of the first channel is set to 1 at the time of synthesis.
  • the delay circuits 53 to 53 n are combined so that the total level becomes 0.3 to 0.8.
  • Reference numeral 56 denotes a second synthesizer.
  • This synthesizer 56 is a signal of the second channel, the output signal of the difference signal generation circuit 52; The output signals of are synthesized.
  • the synthesizer 5 6 synthesis when the VOLUME level of the second channel signal is 1, the difference signal generating circuit 5 and second output signal and the delay circuit 5 4, the output signal of ⁇ 5 4 n Combined so that the total volume is between 0.3 and 0.8.
  • the delay circuits are referred to as a delay circuit 53, a delay circuit 53 2 , a delay circuit 54, and a delay circuit 54 2, and are set to the delay circuit 53 and the delay circuit 54.
  • 0. 5 msec delay time the delay circuit 5 3 2 and the delay circuit 5 4 2 delay time set Bok 1. to 0 msec.
  • the distribution ratio of the volume levels of the synthesizers 55, 56 is as follows. When the volume level of the channel signal is set to 1, the output signal of the difference signal generation circuit and the output signal of the delay circuit are output. The total volume level is ⁇ .
  • 6 and 7 are diagrams for explaining the operation of the system.
  • 6 ⁇ is a listener
  • 61 is a speaker arranged on the left side from the listener 60
  • 62 is a speaker arranged on the right side from the listener 60.
  • a signal output from the synthesizer 55 is generated from the speaker 61
  • a signal output from the synthesizer 56 is reproduced from the speaker 62.
  • the sound reproduced from the speaker 61 is all input to the left ear of the listener 60, and the sound reproduced from the speaker 62 is all input to the right ear of the listener 60, a sound with a very three-dimensional effect is obtained. Place.
  • the sound reproduced from the speaker 61 is not only the left ear of the listener 60 but also a little delayed due to the influence of the human head, and is unnecessary sound for the right ear of the listener 60. Is entered.
  • the sound reproduced from the speaker 62 is input as unnecessary sound not only to the right ear of the listener 60 but also to the left ear of the listener 60 with a slight delay due to the influence of the human head. .
  • a sound 61a (first channel signal) which is originally required and a sound 6 ⁇ b (difference signal) which cancels unnecessary sound are output. Note that an unnecessary sound input to the right ear of the listener 60 is assumed to be 6 ⁇ c.
  • the speaker 62 outputs an originally required sound 62a (second channel signal) and a sound 62b (difference signal) for canceling unnecessary sound.
  • An unnecessary sound that is input to the left ear of the listener 60 is referred to as 62 c.
  • the sound 61a but also the sound 62c is input to the left ear of the listener 60. Therefore, the sound 6 1b (delay time 1.0 msec). Similarly, not only the sound 62a but also the sound 61c is input to the right ear of the listener 60. Therefore, the sound 61c is canceled by the sound 62b (the difference signal and the delay time is 0) which is not delayed.
  • FIG. 8 is a diagram for explaining a case where four channels of sound are collected by a microphone device and reproduced on four channels.
  • microphone device A is placed in the center, a drum is placed on the front left, a piano is placed on the front right, a guitar is placed on the back left, and a bass is placed on the back right.
  • a speaker 83 is arranged on the front left
  • a speaker 84 is arranged on the front right
  • a speaker 85 is arranged on the rear left
  • a speaker 86 is arranged on the rear right. Listeners were asked to listen.
  • FIG. 9 is a diagram for explaining a case in which four channels of sound are collected by the microphone device A, the sound is converted into two channels by the channel conversion system, and reproduced by the headphone.
  • the channel that picks up the sound on the left front is the second channel FZ
  • the channel that picks up the sound on the rear left is the second channel RZL
  • the channel that picks up the right front sound is the third channel FZR
  • the channel that picks up the right rear sound is the fourth channel RZR.
  • the sound of the second channel RZL and the sound of the fourth channel RZR are input to the equalizer 31.
  • the equalizer 31 gives the sound shown in FIG. 4 to the sound of the second channel RZL and the sound of the fourth channel RZR to correct the frequency.
  • the sound of the second channel RZL is synthesized by the synthesizer 32 with the first channel FZL.
  • the sound of the fourth channel RZR is synthesized by the synthesizer 33 with the third channel FZR.
  • a sound field full of immersiveness that was incomparable to the sound reproduced by the conventional stereo system was reproduced. That is, around the listener 92, a drum sound can be heard from the front left, a piano sound can be heard from the front right, and a rear sound can be heard. I heard a guitar sound from the left, and a bass sound from the rear right.
  • FIG. 10 is a diagram for explaining a case where sound is collected using a microphone device and the sound is processed by a channel conversion system and a sound processing system.
  • the delay delay circuit circuit 5 3 In this case, as described above, four channels of sound were collected by the microphone device A, and this sound was converted to two channels by the channel conversion system, and then further processed by the sound processing system 100.
  • the delay delay circuit circuit 5 3 the delay circuit 5 3 2, the delay circuit 5 4, and a delay circuit 5 4 2, the delay circuit 5 3, and the delay circuit 5 4, delay time set me the 0. 5 msec, the delay time set Bok to the delay circuit 5 3 2 3 ⁇ 4 beauty delay circuit 5 4 2 1. 0 msec.
  • the distribution ratio of the level is the volume of the channel signal. When the level is 1, the sum of the output signal of the difference signal generation circuit and the output signal of the delay circuit is given. Has a volume level of 0.6.
  • this microphone device has four channels. The best results can be obtained when playing back with headphones, but if it is assumed that headphones will be used for listening, frequency correction and conversion to two channels can be done with less effort using the conventional stereo method. It was found that a sound field that could not be reproduced was reproduced.
  • the collected sound was processed and then recorded on a 2-channel (2-track) tape recorder, but the collected sound was recorded once on a 4-channel (4-track) tape recorder. It may be processed later and recorded on a 2-channel (2-track) tape recorder.
  • the recording medium is not limited to magnetic tape, but may be a record or CD.
  • stereo broadcasting not only FM broadcasting, but also stereo broadcasting (2-channel) broadcasting such as AM stereo broadcasting can reproduce a sound field full of presence.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereophonic System (AREA)

Abstract

L'invention porte sur une microphone de structure quasiment sphérique (1). Cette dernière comporte, sur son extrémité gauche un premier élément de microphone (2a) dont la directivité s'exerce dans deux directions au moins et, sur son extrémité droite, un second élément de microphone (2b) dont la directivité s'exerce également dans deux directions au moins.
PCT/JP1996/000939 1996-04-05 1996-04-05 Systeme acoustique WO1997038553A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP1996/000939 WO1997038553A1 (fr) 1996-04-05 1996-04-05 Systeme acoustique
EP96908354A EP0848572A1 (fr) 1996-04-05 1996-04-05 Systeme acoustique

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Application Number Priority Date Filing Date Title
PCT/JP1996/000939 WO1997038553A1 (fr) 1996-04-05 1996-04-05 Systeme acoustique

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WO1997038553A1 true WO1997038553A1 (fr) 1997-10-16

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* Cited by examiner, † Cited by third party
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JP2002095098A (ja) * 2000-09-19 2002-03-29 Matsushita Electric Ind Co Ltd 音響再生装置
JP2005198251A (ja) * 2003-12-29 2005-07-21 Korea Electronics Telecommun 球体を用いた３次元オーディオ信号処理システム及びその方法

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2374299A1 (fr) 2002-03-01 2003-09-01 Charles Whitman Fox Reseau modulaire de microphones pour l'enregistrement de son d'ambiance
FR2854537A1 (fr) * 2003-04-29 2004-11-05 Hong Cong Tuyen Pham Casque acoustique pour la restitution spatiale d'un son.
US8634572B2 (en) * 2005-01-13 2014-01-21 Louis Fisher Davis, Jr. Method and apparatus for ambient sound therapy user interface and control system
CN101133678A (zh) * 2005-01-13 2008-02-27 环境医疗有限责任公司 用于环境声音疗法用户接口和控制系统的方法与装置
EP1867206B1 (fr) * 2005-03-16 2016-05-11 James Cox Ensemble de microphones et systeme de traitement numerique des signaux

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5289001U (fr) * 1975-12-25 1977-07-02
JPS53140002A (en) * 1977-05-13 1978-12-06 Victor Co Of Japan Ltd Echo adding device for stereophonic acoustic reproducing system of two channel type
JPS5843959B2 (ja) * 1977-04-04 1983-09-30 日本ビクター株式会社 バイノ−ラル信号収録装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5289001U (fr) * 1975-12-25 1977-07-02
JPS5843959B2 (ja) * 1977-04-04 1983-09-30 日本ビクター株式会社 バイノ−ラル信号収録装置
JPS53140002A (en) * 1977-05-13 1978-12-06 Victor Co Of Japan Ltd Echo adding device for stereophonic acoustic reproducing system of two channel type

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002095098A (ja) * 2000-09-19 2002-03-29 Matsushita Electric Ind Co Ltd 音響再生装置
JP2005198251A (ja) * 2003-12-29 2005-07-21 Korea Electronics Telecommun 球体を用いた３次元オーディオ信号処理システム及びその方法

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