WO2007116658A1 - スピーカ装置 - Google Patents
スピーカ装置 Download PDFInfo
- Publication number
- WO2007116658A1 WO2007116658A1 PCT/JP2007/056052 JP2007056052W WO2007116658A1 WO 2007116658 A1 WO2007116658 A1 WO 2007116658A1 JP 2007056052 W JP2007056052 W JP 2007056052W WO 2007116658 A1 WO2007116658 A1 WO 2007116658A1
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- WIPO (PCT)
- Prior art keywords
- speaker
- phase
- filter circuit
- audio signal
- sound
- Prior art date
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S3/00—Systems employing more than two channels, e.g. quadraphonic
- H04S3/002—Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
- H04R1/403—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers loud-speakers
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- 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
- H04R2205/024—Positioning of loudspeaker enclosures for spatial sound reproduction
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/13—Acoustic transducers and sound field adaptation in vehicles
Definitions
- the present invention relates to a technical field of a speaker device having at least two speech forces having directivity in a reproduction direction of an audio signal, for example.
- a tone Zole system speaker device is generally known as a speaker device that reproduces sound while realizing directivity in the reproduction direction of an audio signal.
- a tone Zole system speaker device a plurality of speaker (or speaker unit) forces are separated by a fixed distance and arranged in a line in the horizontal direction (that is, in the horizontal direction).
- the audio signal reproduced from these two loudspeakers is at a frequency corresponding to a wavelength twice as long as the certain distance.
- the sound signal radiated laterally is canceled by the phase difference caused by a certain distance.
- the audio signals reproduced from these two speakers are synthesized and the sound pressure level is increased.
- Patent Document 1 it has been proposed as a method of developing the tone Zole type speaker device.
- Patent Document 1 Japanese Patent No. 2528178
- Patent Document 2 Patent 2675388
- Patent Document 3 Patent No. 2846363
- Patent Document 4 Patent 3473517
- Patent Literature 5 Patent No. 3422281
- Patent Document 6 Patent 3422282
- Patent Document 7 Patent 3422296
- Patent Document 8 Patent 3205625
- Patent Document 9 Patent 2574454 Disclosure of the invention
- the present invention has been made in view of, for example, the above-described problems.
- a speaker device capable of realizing directivity in a wider frequency band in an audio signal reproduced from two speech forces. It is an issue to provide.
- the speaker device of the present invention will be described below.
- a speaker device of the present invention reproduces an audio signal, a first speaker that reproduces an audio signal, and is separated from the first speaker by a predetermined distance in the horizontal direction. And at least one of the first speaker and the second speaker force is based on (i) the frequency of the audio signal and (ii) the predetermined distance. And a phase change means for changing the phase of the audio signal by a predetermined amount of phase.
- the second speaker that reproduces the audio signal has substantially the same radiation direction as that of the first speaker that reproduces the audio signal, for example, and radiates sound waves.
- the speaker is arranged at a predetermined distance in the horizontal direction.
- the phase change means included in at least one of the first speaker and the second speaker is based on the frequency of the ⁇ audio signal and (i) the predetermined distance.
- the phase of the audio signal is changed by a predetermined amount.
- the phase change means first determines a predetermined wavelength from, for example, 180 degrees ( ⁇ ) based on the wavelength corresponding to the frequency of the ⁇ audio signal and (i) a predetermined distance between the first speaker and the second speaker. A predetermined amount of phase is determined by subtracting the phase corresponding to the distance.
- the phase change means For example, the phase of the audio signal reproduced in at least one of the first speaker and the second speaker is changed by a predetermined amount of the determined phase, for example, by advancing or delaying.
- the phase of the audio signal reproduced in at least one of the first force and the second speaker is changed as a predetermined amount of phase, for example, by about 180 degrees ( ⁇ ) or advanced or delayed. Therefore, the phase of the sound wave radiated from the first speaker (hereinafter referred to as “first sound wave” as appropriate) and the phase of the sound wave radiated from the second speaker (hereinafter referred to as “second sound wave” as appropriate). For example, a phase difference of about 180 degrees ( ⁇ ) occurs.
- the predetermined distance between the first speaker and the second speaker is approximately a quarter of the wavelength corresponding to the frequency of the audio signal
- at least one of the first speaker and the second speaker The phase of the audio signal reproduced at is changed by advancing or delaying, for example, about 90 degrees ( ⁇ 2) as a predetermined amount of phase. Therefore, for example, a phase difference of about 180 degrees ( ⁇ ) is generated between the phase of the first sound wave radiated from the first speaker and the phase of the second sound wave radiated from the second speaker.
- phase of the audio signal reproduced in step S1 is advanced or delayed, that is, not changed, as a predetermined amount of phase, for example, about 0 degree. Therefore, a phase difference of, for example, about 180 degrees ( ⁇ ) occurs between the phase of the first sound wave emitted from the first speaker and the phase of the second sound wave emitted from the second speaker.
- the second sound wave radiated is based on a phase difference of about 180 degrees ( ⁇ ), for example, and cancels out!
- the sound pressure level corresponding to this frequency can be made almost zero. is there.
- the sound pressure level of the synthesized sound wave composed of the first sound wave and the second sound wave is maintained at a normal level with little or no influence of sound wave interference. Ru .
- the sound pressure level of either the first sound wave or the second sound wave has little or no influence of sound wave interference. Maintained at a level of.
- the sound pressure level of the sound wave radiated from the first speaker and the second speaker is in the horizontal direction (horizontal direction), that is, in either the right direction or the left direction. , Make it relatively low.
- (0 front direction and (ii) one of right side direction and left side direction are made relatively high. Therefore, the sound wave radiated by the first speaker and the second speaker is It is possible to maintain the directivity appropriately.
- the phase change unit may be configured such that (i) the frequency of the audio signal and the second audio signal is a wavelength that is approximately twice as long as the predetermined distance.
- the predetermined amount is decreased as the frequency approaches the corresponding reference frequency, and (ii) the predetermined amount is increased as the frequency of the audio signal or the second audio signal moves away from the reference frequency.
- phase difference for example, a phase difference of about 180 degrees ( ⁇ ) is given to the phase of the audio signal reproduced by the first speaker and the phase of the audio signal reproduced by the second speaker force. Therefore, it is possible to clearly and appropriately define the phase characteristics indicating the amount of phase change determined by using the frequency as a parameter in the phase changing means based on the comparison between the frequency and the reference frequency.
- This reference frequency can be defined with high accuracy based on the speed of sound in the air.
- the phase changing means may correspond to a wavelength whose frequency of the audio signal and the second audio signal is twice as long as the predetermined distance.
- the predetermined amount is set to substantially zero.
- phase difference for example, a phase difference of about 180 degrees ( ⁇ ) is given to the phase of the audio signal reproduced by the first speaker and the phase of the audio signal reproduced by the second speaker force. Therefore, it is possible to clearly and appropriately define the phase characteristics in the phase changing means based on the reference frequency.
- the phase changing means may be configured so that the predetermined distance of 2
- the reference frequency corresponding to the double wavelength is set to a predetermined range (“200 to 3 k” Hz) corresponding to the human voice.
- the sound pressure level of the sound wave radiated by the first speaker and the second speaker in a predetermined range corresponding to human voice, such as 200 to 3k (Hz), is In any one of the lateral direction, that is, the right side direction and the left side direction, it is possible to make the radiated sound wave appropriately maintain directivity by making it relatively low.
- the phase changing means is a sound of a synthesized sound wave obtained by synthesizing the first sound wave radiated from the first speaker and the second sound wave radiated from the second speaker. Based on the pressure level, the phase is changed by the predetermined amount (approximately 90 degrees).
- the sound pressure level of the synthesized sound wave radiated in the front direction orthogonal to the horizontal direction can be defined based on a predetermined amount of phase difference.
- the synthesized sound wave (sound pressure level: +3 (dB: decibel)) when the predetermined amount of phase difference is approximately 90 degrees is the level of the first sound wave and the second sound wave.
- the sound pressure level can be reduced to about 3 (dB).
- the phase changing means includes an inductor (coil).
- a filter circuit including a capacitor.
- the phase changing means includes an inductor (coil).
- an all-pass filter circuit including a capacitor.
- the phase changing means (i) a primary filter circuit that changes the phase of a first angle (for example, 180 degrees) with respect to the audio signal, and (Ii)
- It includes at least one of secondary filter circuits that change the second audio signal by a phase of a second angle (for example, 360 degrees).
- the resonance frequency may be 90 degrees
- the resonance frequency may be 180 degrees.
- the phase change means includes: (i) a dual that maintains a dual relationship with the secondary filter circuit in addition to or instead of the primary filter circuit. It may be configured to include a secondary filter circuit, or (ii) a dual primary filter circuit that maintains a dual relationship with the primary filter circuit in addition to or instead of the secondary filter circuit. Yes.
- the “dual relationship” means a relationship having a configuration in which an inductor and a capacitor are interchanged in the primary filter circuit, and in series in the secondary filter circuit. This means a configuration in which the resonant circuit and the parallel resonant circuit are interchanged.
- At least one of the first speaker and the second speaker has the one phase changing means corresponding to one audio signal
- At least the other of the first speaker and the second speaker has the other phase change means corresponding to the other audio signal.
- the first direction in the lateral direction that is, the right direction or the left direction (for example, the second speaker side).
- the first sound wave radiated from the sound force ie, the first sound wave corresponding to one sound signal
- the second sound wave radiated from the second speaker ie, the second sound wave corresponding to one sound signal.
- the sound wave is canceled based on a phase difference of about 180 degrees ( ⁇ ), for example, and the sound pressure level corresponding to this frequency can be made almost zero.
- the first sound wave ie, the first sound wave corresponding to one sound signal
- the second sound wave ie, the second sound wave corresponding to one sound signal
- the sound pressure level of the synthesized sound wave is maintained at a normal level (based only on the phase difference of the sound signal) with little or no effect of sound wave interference.
- the right side direction or the left side direction for example, At the first speaker side, the first sound wave (that is, the first sound wave corresponding to one audio signal).
- the sound pressure level is maintained at a normal level with little or no sonic interference effects.
- the sound pressure level of the radiated sound wave (that is, the first sound wave and the second sound wave corresponding to one sound signal) is any of the horizontal direction, that is, the right direction and the left direction. In either direction (for example, the second speaker side), make it relatively low. In addition, (i) the front direction and (ii) any one of the right side direction and the left side direction are made relatively high. Accordingly, the directivity can be appropriately maintained in the sound waves radiated from the first speaker and the second speaker (that is, the first sound wave and the second sound wave corresponding to one sound signal).
- the first spin in the horizontal direction that is, the right direction or the left direction (for example, the first speaker side).
- the first sound wave radiated from the force (ie, the first sound wave corresponding to another sound signal) and the second sound wave radiated from the second sound force ie, the second sound wave corresponding to the other sound signal.
- the sound wave is canceled based on a phase difference of about 180 degrees ( ⁇ ), for example.
- the sound pressure level corresponding to this frequency can be made almost zero.
- the first sound wave (that is, the first sound wave corresponding to another sound signal) and the second sound wave (that is, the second sound wave corresponding to another sound signal) are synthesized.
- the sound pressure level of the synthesized sound wave is maintained at a normal level with little or no influence of sound wave interference (only based on the phase difference of the sound signal).
- the sound pressure level of the second sound wave that is, the second sound wave corresponding to another sound signal
- the sound pressure level of the radiated sound wave (that is, the first sound wave and the second sound wave corresponding to another sound signal) is any of the horizontal direction, that is, the right direction and the left direction. In either direction (for example, the first speaker side), make it relatively low. In addition, (i) the front direction and (ii) any one of the right side direction and the left side direction are made relatively high. Therefore, sound waves radiated from the first speaker and the second speaker (i.e., other The directivity can be appropriately maintained in the first sound wave and the second sound wave corresponding to the audio signal.
- the phase changing means is a digital filter circuit.
- the first speaker and the second speaker have substantially the same reproduction direction and are arranged side by side in the horizontal direction.
- a sound absorbing material is further provided near the outside of the second speaker.
- the sound pressure level of the sound wave radiated by the first speaker and the second speaker based on the sound absorbing material provided near the outside of the first speaker and the second speaker is In the lateral direction, that is, in either the right side direction or the left side direction, it is possible to make the radiated sound wave appropriately directivity by making it relatively low.
- the reproduction direction of the first speaker differs from the reproduction direction of the second speaker by approximately 90 degrees.
- the sound wave radiated by the first speaker and the second speaker is based on the second speaker arranged so that the reproduction direction differs from the reproduction direction of the first speaker by approximately 90 degrees.
- the sound pressure level in the horizontal direction that is, in either the right direction or the left direction, can be made relatively low so that the radiated sound wave can maintain the directivity appropriately. It is.
- the first speaker, the second speaker, and the phase changing means are provided. Therefore, the sound pressure level of the sound wave radiated by the first speaker and the second speaker is either in the horizontal direction, that is, in the right direction or the left direction. In one direction, it is possible to make it relatively low and to keep the directivity appropriately in the emitted sound wave.
- FIG. 1 is a block diagram (FIG. 1 (a)) schematically showing the basic configuration of the speaker device according to the present embodiment, and a schematic diagram (FIG. 1 (b)) schematically showing the arrangement of the speaker device. It is.
- FIG. 2 A circuit diagram (FIG. 2 (a)) schematically showing the configuration of the primary filter circuit according to the present embodiment, and a graph (FIG. 2 (2)) schematically showing the phase characteristics of the primary filter circuit. b)).
- FIG. 3 is a circuit diagram schematically showing the configuration of the secondary filter circuit according to the present embodiment (FIG. 3 (a)), and a graph schematically showing the phase characteristics of the secondary filter circuit (FIG. 3 ( b)).
- FIG. 4 is a graph showing a specific example of a phase characteristic indicating a change amount of a phase determined by using a frequency as a parameter according to the present embodiment.
- FIG. 5 A graph showing a specific example of the phase characteristic according to this embodiment (FIG. 5 (a)) and the basic principle of changing the phase by 180 degrees in the phase characteristic according to this embodiment. This is a schematic diagram (Fig. 5 (b)).
- FIG. 6 A graph showing a specific example of the phase characteristics according to this embodiment (FIG. 6 (a)), and the basic principle of changing the phase by 90 degrees in the phase characteristics according to this embodiment. This is a schematic diagram (Fig. 6 (b)).
- FIG. 7 A graph (FIG. 7 (a)) showing a specific example of the phase characteristic according to the present embodiment and the basic principle when the phase is not changed in the phase characteristic according to the present embodiment. This is a schematic diagram (Fig. 7 (b)).
- FIG. 8 is a graph showing another specific example of the phase characteristic indicating the amount of phase change determined by using the frequency as a parameter according to the present embodiment.
- FIG. 9 A graph (FIG. 9 (a)) showing the relationship between the angle of the directivity direction in which sound is emitted, the frequency, and the sound pressure level according to the present embodiment, and the sound according to the present embodiment.
- Fig. 9 (b) shows the relationship between pressure level and frequency.
- FIG. 10 A graph (FIG. 10 (a)) showing the relationship between the angle of the directivity direction in which sound radiates and the frequency according to the comparative example, and the sound pressure level and the frequency according to the comparative example. The graph shows the relationship (Fig. 10 (b)).
- FIG. 11 is a block diagram (FIGS. 11 (a) and 11 (b)) schematically showing one and other basic configurations of a speaker device according to another embodiment (part 1).
- FIG. 12 is a graph schematically showing a synthesized phase characteristic in a filter circuit provided in a speaker device according to another embodiment (part 1).
- FIG. 13 is a block diagram schematically showing another basic configuration of another embodiment (part 1) of such a speaker device.
- FIG. 14 is a block diagram schematically showing another basic configuration of another embodiment (part 2) of such a speaker device.
- FIG. 15 is a block diagram schematically showing another basic configuration of another embodiment (part 3) of the speaker device.
- FIG. 16 is a block diagram schematically showing another basic configuration of another embodiment (part 4) of the speaker device.
- FIG. 17 is a schematic diagram schematically showing an application example of such a speaker device according to another embodiment (part 4).
- FIG. 1 is a schematic diagram showing the basic configuration of the speaker device according to the present embodiment.
- the speaker device SP reproduces an audio signal and radiates sound waves, a first speaker SP1 that reproduces sound waves and radiates sound waves.
- the apparatus includes a two-speaker SP2, a primary filter circuit APF1 connected to the first speaker SP1, and a secondary filter circuit APF2 connected to the second speaker SP2.
- the first speaker SP1 and the second speaker SP2 may have an amplifier inside or outside.
- the primary filter circuit APF1 and the secondary filter circuit APF2 constitute a specific example of the phase changing means according to the present invention.
- the first speaker SP1 and the second speaker SP2 housed in one housing are arranged side by side in the horizontal direction.
- the first speaker SP1 and the second speaker SP2 are separated by a predetermined distance “L” in the horizontal direction. And the radiation direction of the synthesized sound wave of the sound wave radiated from the first speaker and the sound wave radiated from the second speaker is a direction substantially intersecting with the horizontal direction.
- the first speaker SP1 and the second speaker SP2 may be stored in two housings, respectively.
- the sound pressure level of the radiated sound wave from the first speaker SP1 and the second speaker force SP2 is in the lateral direction (horizontal direction).
- the objective is to make it relatively low in either the right direction or the left direction (for example, the second speaker SP2 side).
- it is intended to make it relatively high in (i) the front direction and (ii) one of the right side direction and the left side direction.
- the main purpose is to properly maintain the directivity of the emitted sound wave.
- FIG. 2 is a circuit diagram (FIG. 2 (a)) schematically showing the configuration of the primary filter circuit according to the present embodiment, and a graph schematically showing the phase characteristics of the primary filter circuit (FIG. Figure 2 (b)).
- FIG. 3 is a circuit diagram schematically showing the configuration of the secondary filter circuit according to the present embodiment (FIG. 3 (a)), and a graph schematically showing the phase characteristics of the secondary filter circuit (FIG. 3 ( b)
- FIG. 2 is a circuit diagram (FIG. 2 (a)) schematically showing the configuration of the primary filter circuit according to the present embodiment, and a graph schematically showing the phase characteristics of the secondary filter circuit (FIG. 3 ( b)
- the primary filter circuit APF1 may be a primary all-pass filter including an inductor (coil) or a capacitor (capacitor).
- this primary filter circuit APF1 has a constant amplitude characteristic (for example, “0 (dB)”), and (i) the amount of phase change is a reference angular frequency “ ⁇ ⁇ ⁇ '' is ⁇ -90 (degrees) '', and (ii) when the amount of phase change exceeds the reference angular frequency ⁇ ⁇ ⁇ '', it will be ⁇ -180 (degrees) '' Has characteristics.
- This primary filter circuit APF1 is applied to the first speaker SP1, for example.
- the secondary filter circuit APF2 is a grid type analog circuit including an inductor (coil) or a capacitor (capacitor). It may be a filter.
- this second-order filter circuit APF2 has a constant amplitude characteristic (for example, "0 (dB)"), and (i) the amount of phase change is the reference angular frequency. “ ⁇ ⁇ ” is “ ⁇ 180 (degrees)”, and (ii) phase change amount force It has a physical characteristic of “ ⁇ 360 (degrees)” beyond this standard.
- This second-order filter circuit APF2 is applied to the second speaker SP2, for example.
- the phase characteristics of the speaker device are designed based on the following four conditions.
- the first condition is that the sound pressure level of the radiated sound wave is reduced only in one of the horizontal direction (horizontal direction), that is, the right direction and the left direction.
- the second condition is that the phase difference in the horizontal direction is brought close to “180 (degrees)” (ie, opposite phase).
- the third condition is that the phase difference in the front direction is hardly or completely generated. In other words, the disturbance or loss of the sound pressure level in the front direction is within a predetermined allowable range (about “3 (dB)”). It is necessary to fit.
- the fourth condition is to satisfy the second condition while minimizing the disturbance or loss of the sound pressure level in the front direction in the third condition.
- the phase changing means according to the present invention can be realized by a digital filter circuit. As a result, the desired phase characteristic can be realized while improving the approximation accuracy based on the digital filter circuit.
- FIG. 4 is a graph showing a specific example of the phase characteristic indicating the amount of change in the phase determined using the frequency as a parameter according to the present embodiment.
- FIG. 5 is a graph (FIG. 5 (a)) showing a specific example of the phase characteristic according to the present embodiment, and the basic principle when the phase is changed by 180 degrees in the phase characteristic according to the present embodiment.
- Fig. 5 is a schematic diagram (Fig. 5 (b)).
- FIG. 6 is a graph (FIG. 6 (a)) showing a specific example of the phase characteristic according to the present example, and the basic principle when the phase is changed by 90 degrees in the phase characteristic according to the present example.
- Fig. 6 is a schematic diagram (Fig. 6 (b)).
- FIG. 7 is a graph (FIG. 7 (a)) showing a specific example of the phase characteristics according to the present embodiment, and the basic principle when the phase is not changed in the phase characteristics according to the present embodiment. It is the schematic diagram shown (Fig. 7 (b)).
- the nonlinear curve indicating the amount of change in phase with the frequency as a parameter is at least at the reference frequency (eg, 1.75 (kHz)). It is specified that the amount of change takes a value of 0 degrees.
- the reference frequency according to the present embodiment means a frequency that can be defined based on the speed of sound in the air and that corresponds to a wavelength that is approximately twice as long as a predetermined distance.
- the amount of phase change decreases as the frequency approaches the reference frequency, and the amount of phase change increases as the frequency moves away from the reference frequency force.
- the frequency of the audio signal is, for example, a frequency of about 200 (Hz) (see point "P1"), and the frequency of the audio signal
- the phase of the audio signal reproduced on at least one of the first speaker and the second speaker is set to about 180 degrees ( ⁇ ), for example. Change it by moving it forward or delaying it.
- the wavelength of the first sound wave radiated from the first speaker (see “Sound 1”) corresponding to the frequency of the sound signal, and the sound
- the wavelength of the second sound wave (see “Sound 2”) that corresponds to the frequency of the signal and is emitted from the second speaker is compared with the predetermined distance “L” between the first force SP1 and the second speaker SP2.
- the phase of the audio signal reproduced in at least one of the first speaker and the second speaker is advanced or delayed by, for example, about 180 degrees ( ⁇ ), etc. And change it.
- the phase of the first sound wave radiated from the first speaker and the second force are radiated in the lateral direction (horizontal direction), that is, in either the right direction or the left direction.
- a phase difference of about 180 degrees ( ⁇ ) occurs with the phase of the second sound wave.
- the predetermined distance “L” between the first speaker SP1 and the second speaker SP2 corresponds to the frequency of the audio signal, and the first speaker force is also radiated.
- the wavelength of the first sound wave (see “Sound 1”) and the wavelength of the second sound wave (see “Sound 2”) emitted from the second speaker corresponding to the frequency of the audio signal.
- the phase of the audio signal reproduced on at least one of the first speaker and the second speaker is changed, for example, by advancing or delaying by about 90 degrees ( ⁇ 2).
- a phase difference of about 180 degrees ( ⁇ ) occurs.
- the frequency of the audio signal is a reference frequency such as about 1750 (Hz) (see point "P3"), for example, the first speaker
- the phase of the audio signal reproduced in at least one of the second speaker and the second speaker is advanced or delayed, that is, not changed by, for example, about 0 degree.
- the predetermined distance “L” between the first speaker SP1 and the second speaker SP2 corresponds to the frequency of the audio signal, and the first speaker force is also radiated. 1st sound It is approximately half the wavelength of the wave (see “Sound 1”) and the wavelength of the second sound wave (see “Sound 2”) emitted from the second speaker, corresponding to the frequency of the audio signal.
- the phase of the audio signal reproduced on at least one of the first speaker and the second speaker is advanced or delayed, that is, not changed by, for example, about 0 degree.
- a phase difference of about 180 degrees ( ⁇ ) occurs with the phase of the sound wave.
- the second sound wave radiated is based on a phase difference of about 180 degrees ( ⁇ ), for example, and cancels out!
- the sound pressure level corresponding to this frequency can be made almost zero. is there.
- the sound pressure level of the combined sound wave of the first sound wave and the second sound wave is influenced by sound wave interference (only based on the phase difference of the sound signal). Maintains normal levels with little or no.
- the sound pressure level of either the first sound wave or the second sound wave is almost or completely affected by the sound wave interference. Not maintained at normal level.
- the sound pressure level of the radiated sound wave is one of the horizontal direction (horizontal direction), that is, the right direction and the left direction. In the direction of, make it relatively low. At the same time, it is made relatively high in (i) the front direction and (ii) one of the right side direction and the left side direction. Therefore, the directivity can be appropriately maintained in the first sound force and the sound wave radiated from the second speaker.
- FIG. 8 is a graph showing another specific example of the phase characteristic indicating the amount of phase change determined by using the frequency as a parameter, according to the present embodiment.
- FIG. 9 is a graph (FIG. 9 (a)) showing the relationship between the angle of the directivity direction in which sound radiates, the frequency, and the sound pressure level according to the present embodiment, and according to the present embodiment.
- a graph showing the relationship between sound pressure level and frequency (Fig. 9 ( b)).
- FIG. 10 is a graph (FIG.
- FIGS. 9 and 10 “+ (plus)” (or “one (minus)”) indicates the right and left sides relative to the horizontal direction in which the first speaker and the second speaker are arranged. It is defined as 1 mm based on either direction.
- the phase characteristics in the phase changing means according to the present embodiment are defined.
- the dotted line in Fig. 8 shows the target theoretical phase characteristics.
- the theoretical phase characteristic that is the target is the disturbance of the sound pressure level in the direction that differs by 90 degrees from the horizontal direction in which the first speaker SP1 and the second speaker SP2 are horizontally arranged, the so-called front direction. It is specified to be within 3 (dB).
- the solid line in FIG. 8 shows the phase characteristics that were actually realized. Note that the phase characteristics that were actually realized were that the predetermined distance “L” between the first speaker SP1 and the second speaker SP2 was “10 (cm)”.
- the angular frequency used as a reference for the primary filter circuit “APF1”, which is an example, is 280 (Hz), and is another specific example of the phase change unit according to the present embodiment, which is the secondary filter circuit “APF2”.
- the reference angular frequency is designed to be 1850 (Hz).
- the apertures of the first speaker SP1 and the second speaker SP2 are both “5 (cm)”.
- the first sound signal with a frequency of 1 (k Hz) and a force of 2 (kHz) emits sound.
- the angle of the pointing direction is "-90 (degrees)” to "-60 (degrees)”
- the sound pressure level is changed from “-20” to "-18”
- the sound pressure level can be relatively lowered. Is possible.
- the sound pressure level in the front direction for example, "+30 (degrees)” to “-30 (degrees)", for example, “-60 (degrees) ) ”To the horizontal sound pressure level such as“ -90 (degrees) ”,
- the frequency of the audio signal is, for example, from human beings such as“ 800 (Hz) ”to“ 3 (KHz) ”. In the corresponding range, it can be confirmed that the sound pressure level in the lateral direction becomes extremely low. Needless to say, the sound pressure level in the front direction is synthesized with the first audio signal and the second audio signal.
- the sound pressure level in the lateral direction is higher in the vicinity of the frequency of “5 (kHz)”, but is included in the frequency band in which the sound-absorbing material acts effectively, which will be described later. Therefore, it can be attenuated by the sound absorbing material.
- the relative decrease in the sound pressure level is compared to the audio signal in a very narrow frequency band. However, it cannot be realized, and it is difficult to realize directivity for an audio signal in a relatively wide frequency band. As shown by the solid and dotted lines in FIG.
- the sound pressure level in the front direction such as “+30 (degrees)” to “-30 (degrees)”, for example, “-60 (degrees)” to “
- the frequency range of the audio signal corresponds to the human voice such as “800 (Hz)” to “2 (KHz)”. It can be seen that the sound pressure level force in the lateral direction becomes higher than the sound pressure level shown in FIG.
- the frequency is 1 (kHz) and the force is 2 (kHz).
- the sound signal has a relative sound pressure level of “-20” to “-18” when the angle in the direction of direction in which the sound radiates is “ ⁇ 90 (degrees)” to “ ⁇ 60 (degrees)”. The sound pressure level can be lowered.
- the sound pressure level of the sound wave radiated from the first speaker and the second speaker is made relatively low in the lateral direction, that is, either the right side direction or the left side direction. It is possible to properly maintain the directivity of the emitted sound wave.
- analog all-pass filter circuits such as primary filter circuits and secondary filter circuits designed with clarified physical conditions and physical characteristics, low-cost, small phase change means Can be realized easily.
- FIG. 11 is a block diagram (FIGS. 11 (a) and 11 (b)) schematically showing one and other basic configurations of the speaker device according to another embodiment (part 1).
- FIG. 12 is a graph schematically showing the synthesized phase characteristics of the filter circuit provided in the speaker device according to the other embodiment (part 1).
- FIG. 13 is a block diagram schematically showing another basic configuration of the speaker device according to another embodiment (part 1). [0077] As shown in Fig.
- the first speaker SP1, the second speaker Speaker SP2, primary filter circuit APF1 connected to the first speaker SP1, and dual secondary filter circuit AP F2a that has a dual relationship with the secondary filter circuit APF2 connected to the first speaker SP1 You may make it comprise.
- the “dual relationship” according to the present embodiment specifically refers to a filter circuit having a dual relationship with the primary filter circuit, in which an inductor and a capacitor are interchanged.
- a filter circuit having a configuration and having a dual relationship with a secondary filter circuit is a filter circuit having a configuration in which a series resonant circuit and a parallel resonant circuit are interchanged.
- the primary filter circuit APF1 and the dual secondary filter circuit APF2a are combined and connected to the first speaker SP1, the amplitude characteristics are constant (for example, as shown in FIG. 12). “0 (dB)”), and (i) Phase change amount power is “ ⁇ 90 (degrees)” at the reference angular frequency “ ⁇ ⁇ 1”, and (ii) Phase change amount is If the angular frequency exceeds “ ⁇ ⁇ 2”, it may have a physical characteristic of “18 0 (degrees)”!
- the first speaker SP1 the second speaker Dual primary that maintains dual relationship with SP2 and primary filter circuit APF1 connected to first speaker SP1, secondary filter circuit APF2 connected to second speaker SP2, and primary filter circuit APF1 A filter circuit APFla may be provided.
- the first speaker SP 1 and the second speaker The power filter SP2, the primary filter circuit APF1 connected to the first speaker SP1, and the primary filter circuit APF1 connected to the second speaker SP2 may be provided.
- FIG. 14 is a block diagram schematically showing another basic configuration of another embodiment (part 2) of the speaker device.
- FIG. 14 is a block diagram schematically showing another basic configuration of another embodiment (part 2) of the speaker device.
- the secondary filter circuit APF2, the sound absorbing material 1, and the sound absorbing material 2 connected to the second speaker SP2 may be provided.
- the sound absorbing material and the sound absorbing material 2 are arranged in the lateral direction (horizontal direction).
- the sound pressure level of the sound wave radiated from the first speaker SP1 and the second speaker SP2 is the horizontal direction (horizontal direction), that is, the right direction or the left direction. , Relatively low. At the same time, it is made relatively high in (i) the front direction and (ii) one of the right side direction and the left side direction. Accordingly, it is possible to more appropriately maintain the directivity of the sound wave radiated from the first speaker force SP1 and the second speaker SP2.
- FIG. 15 is a block diagram schematically showing another basic configuration of the speaker device according to another embodiment (part 3).
- a primary filter circuit APF1 connected to the first speaker SP1, the second speaker SP2, and the first speaker SP1.
- a second-order filter circuit APF2 connected to the second speaker SP2.
- the second speaker SP2 is arranged such that the reproduction direction of the second speaker SP2 intersects with the reproduction direction of the first speaker SP1, for example, at 90 degrees. Note that the sound pressure level gain may be further adjusted.
- the sound waves radiated from the first speaker SP1 and the second speaker SP2 can be more appropriately maintained in directivity. Is possible.
- FIG. 16 schematically shows another basic configuration of the speaker device according to another embodiment (part 4).
- FIG. 17 is a schematic diagram schematically showing an application example of a speaker device according to another embodiment (part 4).
- the first speaker SP1 for reproducing the first audio signal holding music, the first speaker holding the speech.
- 2 Primary filter circuit APF 1 connected to 2nd speaker SP2 and 1st speaker SP1 for playback of audio signal
- 2nd filter circuit APF2 connected to 2nd speaker SP2
- 2nd speaker SP2 It may be configured to include a primary filter circuit APF lx and a secondary filter circuit APF2x connected to the first speaker SP 1.
- the first sound wave corresponding to the second sound wave and the second sound wave radiated from the second speaker cancel each other based on a phase difference of about 180 degrees ( ⁇ ), for example.
- the sound pressure level corresponding to this frequency can be made almost zero.
- the first sound wave (that is, the first sound wave corresponding to music) and the second sound wave (that is, the second sound wave corresponding to music) are synthesized.
- the pressure level is maintained at a normal level (based only on the phase difference of the audio signal) with little or no sonic interference effects.
- the sound pressure level of the first sound wave that is, the first sound wave corresponding to music
- the normal level is maintained with little or no interference effects.
- the sound pressure level of the radiated sound wave (that is, the first sound wave and the second sound wave corresponding to music) is in the horizontal direction (horizontal direction). That is, it is made relatively low in either the right side direction or the left side direction (for example, the second speaker side).
- the height is made relatively high in (i) the front direction and (ii) one of the right side direction and the left side direction. Therefore, directivity can be appropriately maintained in the sound waves radiated from the first speaker and the second speaker (that is, the first sound wave and the second sound wave corresponding to music).
- the first sound wave radiated from the first speaker ie, the first sound wave corresponding to the speech
- the second sound wave radiated from the second speaker immediately
- the second sound wave corresponding to the speech cancels out based on a phase difference of about 180 degrees ( ⁇ ), for example, and the sound pressure level corresponding to this frequency can be made almost zero.
- the sound pressure of the synthesized sound wave is composed of the first sound wave (ie, the first sound wave corresponding to the speech) and the second sound wave (ie, the second sound wave corresponding to the speech).
- the level is maintained at a normal level (based only on the phase difference of the audio signal) with little or no sonic interference effects.
- the sound pressure level of the second sound wave that is, the second sound wave corresponding to the speech line
- the sound pressure level of the second sound wave is It is maintained at a normal level with little or no interference effects.
- the sound pressure levels of the sound waves radiated from the first speaker SP1 and the second speaker SP2 are lateral (horizontal), that is, In either one of the right side direction and the left side direction (for example, the first speaker side), it is relatively lowered.
- the height is made relatively high in (i) the front direction and (ii) one of the right direction and the left direction. Accordingly, the directivity can be appropriately maintained in the sound waves radiated from the first speaker and the second speaker (that is, the first sound wave and the second sound wave corresponding to the speech).
- the present invention is also applicable to, for example, a speaker device in a large space such as a business concert hall or a store.
- the present invention is not limited to the above-described embodiments, and the entire specification can be modified as appropriate without departing from the gist or concept of the invention which can be read. Is also included in the technical scope of the present invention. Industrial applicability
- the speaker device according to the present invention can be used for, for example, a speaker device having at least two speakers having directivity in the reproduction direction of an audio signal.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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JP2008509726A JP4780805B2 (ja) | 2006-03-28 | 2007-03-23 | スピーカ装置 |
US12/294,676 US8116483B2 (en) | 2006-03-28 | 2007-03-23 | Speaker device with the phase changing device for varying the phase of the audio signal |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2006089269 | 2006-03-28 | ||
JP2006-089269 | 2006-03-28 |
Publications (1)
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WO2007116658A1 true WO2007116658A1 (ja) | 2007-10-18 |
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PCT/JP2007/056052 WO2007116658A1 (ja) | 2006-03-28 | 2007-03-23 | スピーカ装置 |
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US (1) | US8116483B2 (ja) |
JP (1) | JP4780805B2 (ja) |
WO (1) | WO2007116658A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012114696A1 (ja) * | 2011-02-24 | 2012-08-30 | パナソニック株式会社 | 回折音低減装置、回折音低減方法、及び、フィルタ係数決定方法 |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2919454B1 (fr) * | 2007-07-26 | 2009-10-30 | Nexo Sa | Systeme de reproduction sonore a enceinte a events. |
WO2009144781A1 (ja) * | 2008-05-27 | 2009-12-03 | パイオニア株式会社 | 音声再生装置 |
US20100232630A1 (en) * | 2009-03-16 | 2010-09-16 | Electronics And Telecommunications Research Institute | Acoustic multi-pole array and methods of packaging and controlling the same |
JP2013146051A (ja) * | 2011-12-15 | 2013-07-25 | Tei Co Ltd | スピーカシステム |
CN105706461B (zh) * | 2013-09-26 | 2019-07-09 | 邦&奥夫森公司 | 扬声器换能装置 |
JP2019523610A (ja) * | 2016-08-01 | 2019-08-22 | ブループリント アコースティックス ピーティーワイ リミテッドBlueprint Acoustics Pty Ltd | 信号経路における歪みを管理するための装置および方法 |
DE102018117648B3 (de) * | 2018-07-20 | 2019-08-29 | Haberl Electronic Gmbh & Co. Kg | Verfahren zur Verbesserung der Wahrnehmbarkeit eines Sondersignals |
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JPH04132499A (ja) * | 1990-09-25 | 1992-05-06 | Matsushita Electric Ind Co Ltd | 音像制御装置 |
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JP2675388B2 (ja) | 1989-03-14 | 1997-11-12 | 日本電信電話株式会社 | 指向性を有するスピーカ装置 |
JP2574454B2 (ja) | 1989-03-14 | 1997-01-22 | パイオニア株式会社 | 指向性を有するスピーカ装置 |
JP2528178B2 (ja) | 1989-03-14 | 1996-08-28 | パイオニア株式会社 | 指向性を有するスピ―カ装置 |
JP2846363B2 (ja) | 1989-09-29 | 1999-01-13 | パイオニア株式会社 | 指向性を有するスピーカ装置 |
JP3205625B2 (ja) | 1993-01-07 | 2001-09-04 | パイオニア株式会社 | スピーカ装置 |
JP3422281B2 (ja) | 1999-04-08 | 2003-06-30 | ヤマハ株式会社 | 指向性拡声装置 |
JP3422282B2 (ja) | 1999-04-09 | 2003-06-30 | ヤマハ株式会社 | 指向性拡声装置 |
JP3422296B2 (ja) | 1999-08-30 | 2003-06-30 | ヤマハ株式会社 | 指向性拡声装置 |
JP3473517B2 (ja) | 1999-09-24 | 2003-12-08 | ヤマハ株式会社 | 指向性拡声装置 |
JP4300194B2 (ja) * | 2005-03-23 | 2009-07-22 | 株式会社東芝 | 音響再生装置、音響再生方法および音響再生プログラム |
-
2007
- 2007-03-23 US US12/294,676 patent/US8116483B2/en not_active Expired - Fee Related
- 2007-03-23 JP JP2008509726A patent/JP4780805B2/ja not_active Expired - Fee Related
- 2007-03-23 WO PCT/JP2007/056052 patent/WO2007116658A1/ja active Search and Examination
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH04132499A (ja) * | 1990-09-25 | 1992-05-06 | Matsushita Electric Ind Co Ltd | 音像制御装置 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012114696A1 (ja) * | 2011-02-24 | 2012-08-30 | パナソニック株式会社 | 回折音低減装置、回折音低減方法、及び、フィルタ係数決定方法 |
JP5789762B2 (ja) * | 2011-02-24 | 2015-10-07 | パナソニックIpマネジメント株式会社 | 回折音低減装置、回折音低減方法、及び、フィルタ係数決定方法 |
US9191768B2 (en) | 2011-02-24 | 2015-11-17 | Panasonic Intellectual Property Management Co., Ltd. | Diffracted sound reduction device, diffracted sound reduction method, and filter coefficient determination method |
Also Published As
Publication number | Publication date |
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JPWO2007116658A1 (ja) | 2009-08-20 |
US20100220871A1 (en) | 2010-09-02 |
US8116483B2 (en) | 2012-02-14 |
JP4780805B2 (ja) | 2011-09-28 |
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