WO2019135269A1 - スピーカ駆動装置、スピーカ装置およびプログラム - Google Patents
スピーカ駆動装置、スピーカ装置およびプログラム Download PDFInfo
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- WO2019135269A1 WO2019135269A1 PCT/JP2018/000028 JP2018000028W WO2019135269A1 WO 2019135269 A1 WO2019135269 A1 WO 2019135269A1 JP 2018000028 W JP2018000028 W JP 2018000028W WO 2019135269 A1 WO2019135269 A1 WO 2019135269A1
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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
- H04R5/00—Stereophonic arrangements
- H04R5/04—Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments
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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
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/002—Damping circuit arrangements for transducers, e.g. motional feedback circuits
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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
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
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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
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
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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
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
- H04R3/14—Cross-over networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S1/00—Two-channel systems
- H04S1/002—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
- H04S—STEREOPHONIC SYSTEMS
- H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
- H04S7/30—Control circuits for electronic adaptation of the sound field
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
- H04S7/30—Control circuits for electronic adaptation of the sound field
- H04S7/305—Electronic adaptation of stereophonic audio signals to reverberation of the listening space
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S2420/00—Techniques used stereophonic systems covered by H04S but not provided for in its groups
- H04S2420/01—Enhancing the perception of the sound image or of the spatial distribution using head related transfer functions [HRTF's] or equivalents thereof, e.g. interaural time difference [ITD] or interaural level difference [ILD]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S2420/00—Techniques used stereophonic systems covered by H04S but not provided for in its groups
- H04S2420/03—Application of parametric coding in stereophonic audio systems
Definitions
- the present invention relates to a technology for driving a speaker.
- a sound source (binaural sound source) obtained by binaural recording is generally reproduced and listened to by an earphone.
- the listener can listen as a very realistic sound by three-dimensionally recognizing the sound image.
- a part of the signal component from the Lch (left channel) speaker reaches the right ear as a crosstalk sound, and a part of the signal component from the Rch (right channel) speaker Reaches the left ear as a crosstalk sound. Therefore, when the binaural sound source is reproduced by the speaker, a sound image as in the case of listening using the earphone can not be obtained due to the presence of such crosstalk sound.
- Crosstalk sound travels later than direct sound because the propagation distance is longer than direct sound.
- the crosstalk sound can be canceled by reproducing from the speaker by utilizing this phenomenon. Specifically, the delayed Lch sound is subtracted from the sound reproduced from the Rch speaker, and the delayed Rch sound is subtracted from the sound reproduced from the Lch speaker. By this, the crosstalk sound is canceled and it is possible to listen to the sound close to the reproduction by the earphone.
- a system that reproduces such a binaural sound source by a speaker is called a transaural system.
- Patent Document 1 discloses a technology for removing a spatial crosstalk component using a transfer function from the speaker to the right ear and a transfer function from the speaker to the left ear.
- the technique using such a head related transfer function enables highly accurate reproduction, while the position and orientation of the listener are very limited. Therefore, in order to maintain a highly accurate state, it is necessary to use a complicated configuration as in the technique disclosed in Patent Document 1 described above. In addition, head related transfer functions are complex and individual differences are large. Therefore, approximation processing is necessary to provide versatility so as to be able to cope with various people. As a result, the accuracy had to be lowered.
- One of the objects of the present invention is to realize localization in a wide listening range, which is close to reproduction with an earphone while suppressing a change in sound quality when canceling a crosstalk sound.
- a first operation unit that outputs a first operation signal obtained from a first input signal based on a response characteristic according to a first parameter defining an equivalent circuit of a first speaker unit.
- a first drive signal generation unit for generating a first drive signal for driving the speaker unit based on the second drive signal and the first operation signal, and a third for defining an equivalent circuit of a third speaker unit
- a third operation unit that generates a third operation signal from a second input signal based on a response characteristic corresponding to a parameter, and for driving a speaker unit based on the first drive signal and the third operation signal.
- a second drive signal generator configured to generate the second drive signal.
- a first operation unit that outputs a first operation signal obtained from a first input signal based on a response characteristic according to a first parameter defining an equivalent circuit of a first speaker unit.
- a second operation signal including a characteristic value corresponding to the first operation signal and a first drive signal for driving the speaker unit based on a fourth operation signal and the first operation signal;
- a second drive signal generation unit generating a fourth operation signal including a characteristic value corresponding to the third operation signal based on the third operation signal and a second drive signal for driving the speaker unit.
- Speaker driving apparatus is provided, characterized in that it comprises a.
- a fifth operation unit that generates a third drive signal by performing a first operation process on the first drive signal; and a sixth operation unit that generates a fourth drive signal by performing a second operation process on the second drive signal.
- the first drive signal generation unit generates the first drive signal based on the fourth drive signal and the first operation signal, and the first drive signal generation unit is equivalent to a second speaker unit.
- a second operation unit that generates a second operation signal from a signal obtained by combining the first drive signal and the fourth drive signal based on a response characteristic according to a second parameter that defines a circuit; and the first operation
- a first signal control unit configured to control the first drive signal based on the signal and the second operation signal, and the second drive signal generation unit is configured to generate the third drive signal and the third operation signal.
- the second drive signal generation unit Based on the second drive And the second drive signal generation unit combines the second drive signal and the third drive signal based on the response characteristic according to the fourth parameter defining the equivalent circuit of the fourth speaker unit.
- a fourth operation unit that generates a fourth operation signal from the output signal, and a second signal control unit that controls the second drive signal based on the third operation signal and the fourth operation signal. .
- the first drive signal generation unit generates the second operation signal and the first drive signal based on the first operation signal and the sixth operation signal
- the first drive signal generation unit is configured to A second operation unit that generates the second operation signal from the first drive signal based on a response characteristic according to a second parameter that defines an equivalent circuit of the second speaker unit, the second operation signal, and the second operation signal
- a first signal control unit configured to control the first drive signal based on a combined signal of the six operation signals and the first operation signal
- the second drive signal generation unit includes the third operation signal and In the fifth operation signal
- the fourth operation signal and the second drive signal are generated based on the response characteristic according to the fourth parameter defining the equivalent circuit of the fourth speaker unit.
- the second drive signal is generated based on a fourth operation unit that generates the fourth operation signal from the second drive signal, and
- the first arithmetic processing and the second arithmetic processing may include delay processing and attenuation processing.
- the first calculation process and the second calculation process may include a process of folding a predetermined transfer function.
- the first parameter and the second parameter may be set to be the same.
- the third parameter and the fourth parameter may be set identically.
- the first operation signal, the second operation signal, the third operation signal, and the fourth operation signal may include information related to the position of the diaphragm of the speaker unit.
- a speaker device comprising: the above-described speaker drive device; and a plurality of speaker units driven by each of the first drive signal and the second drive signal. Is provided.
- a first operation unit that outputs a first operation signal obtained from a first input signal based on a response characteristic according to a first parameter defining an equivalent circuit of a first speaker unit.
- a first drive signal generation unit for generating a first drive signal for driving the speaker unit based on the second drive signal and the first operation signal, and a third for defining an equivalent circuit of a third speaker unit
- a third operation unit that generates a third operation signal from a second input signal based on a response characteristic corresponding to a parameter, and for driving a speaker unit based on the first drive signal and the third operation signal.
- a program is provided to cause a computer to function as a second drive signal generation unit that generates the second drive signal.
- a first operation unit that outputs a first operation signal obtained from a first input signal based on a response characteristic according to a first parameter defining an equivalent circuit of a first speaker unit.
- a second operation signal including a characteristic value corresponding to the first operation signal and a first drive signal for driving the speaker unit based on a fourth operation signal and the first operation signal;
- a second drive signal generation unit generating a fourth operation signal including a characteristic value corresponding to the third operation signal based on the third operation signal and a second drive signal for driving the speaker unit.
- Program for causing a computer to function are provided with.
- FIG. 1 is a block diagram showing the function of the speaker device in the first embodiment.
- the speaker device 1 includes a speaker drive device 10, a signal input unit 30, an operation unit 60, a display unit 70, and speaker units 80L and 80R.
- the signal input unit 30 has a terminal to which the audio signal Sin is supplied, and separates the supplied audio signal Sin for each channel and inputs it to the speaker driving device 10.
- the audio signal Sin is a 2ch signal
- the signal input unit 30 separates the audio signal Sin into an Lch audio signal SinL (first input signal) and an Rch audio signal SinR (second input signal) And input to the speaker drive device 10.
- the symbols with L and R indicate that the configurations correspond to Lch and Rch, respectively.
- the signal input unit 30 may be supplied by receiving the audio signal Sin from an external device such as a server via a network.
- the speaker driving device 10 receives an Lch driving output signal SaL (first driving signal) for driving the speaker unit 80L and an Rch driving output signal SaR for driving the speaker unit 80R according to the input of the audio signals SinL and SinR. (The second drive signal) is output.
- the components of the speaker drive device 10 will be described later.
- the speaker unit 80L (second speaker unit) outputs a sound corresponding to the Lch drive output signal SaL supplied from the speaker drive device 10.
- the speaker unit 80R (fourth speaker unit) outputs a sound corresponding to the Rch drive output signal SaR supplied from the speaker drive device 10.
- a target speaker unit It is also possible to output a sound that simulates in a pseudo manner.
- the operation unit 60 is a device that receives an input operation of a user such as a touch sensor, a keyboard, and a mouse, and outputs an operation signal according to the input operation to the speaker driving device 10.
- the display unit 70 is a display device such as a liquid crystal display or an organic EL display, and displays a screen based on control of the speaker drive device 10.
- the operation unit 60 and the display unit 70 may be integrated to constitute a touch panel.
- the configuration of the speaker drive device 10 will be described in detail.
- the speaker driving device 10 includes a speaker L driving unit 100L, a speaker R driving unit 100R, a setting unit 170, and a crosstalk signal output unit 180.
- the speaker L drive unit 100L receives the audio signal SinL and the Rch crosstalk signal SfR (fourth drive signal), and outputs an Lch drive output signal SaL based on these signals.
- the speaker R drive unit 100R receives the audio signal SinR and the Lch crosstalk signal SfL (third drive signal), and outputs an Rch drive output signal SaR based on these signals.
- the Lch crosstalk signal SfL and the Rch crosstalk signal SfR are signals which are output from the crosstalk signal output unit 180 after performing predetermined arithmetic processing on the Lch drive output signal SaL and the Rch drive output signal SaR.
- FIG. 2 is a block diagram showing the function of the crosstalk signal output unit in the first embodiment.
- the crosstalk signal output unit 180 includes an Lch signal processing unit 180L (fifth operation unit) and an Rch signal processing unit 180R (sixth operation unit).
- the Lch signal processing unit 180L performs arithmetic processing (first arithmetic processing) on the Lch drive output signal SaL in order to cancel crosstalk noise, and outputs the Lch crosstalk signal SfL.
- the arithmetic processing includes delay processing at a set delay time and amplification processing at a set amplification factor (processing to attenuate the signal level in this example: attenuation processing).
- the delay processing is performed in the delay unit 181L.
- the amplification process is performed in the amplifier 185L.
- the Rch signal processing unit 180R performs arithmetic processing (second arithmetic processing) on the Rch driving output signal SaR in order to generate a crosstalk signal, and outputs it as an Rch crosstalk signal SfR.
- the arithmetic processing includes delay processing at a set delay time and amplification processing at a set amplification factor (processing to attenuate the signal level in this example: attenuation processing).
- the delay processing is performed in the delay unit 181R.
- the amplification process is performed in the amplifier 185R.
- FIG. 3A is a block diagram showing the function of the speaker L drive unit in the first embodiment.
- the speaker L drive unit 100L includes an acquisition unit 110L, a target calculation unit 130L (first calculation unit), and a drive signal generation unit 150L (first drive signal generation unit).
- the acquisition unit 110L acquires the audio signal SinL supplied from the signal input unit 30 as an input signal.
- the target calculation unit 130L performs calculation using the electro-mechanical model of the speaker unit using the audio signal SinL acquired by the acquisition unit 110L, and outputs an Lch target calculation signal Sc1L (first calculation signal) indicating the calculation result.
- This speaker unit is not the above-described speaker unit 80L but a target speaker unit (first speaker unit) of Lch.
- the calculation performed by the target calculation unit 130L is a calculation for obtaining a characteristic value indicating the operation (internal state) of the target speaker unit using the audio signal SinL as an input signal, using the parameter specifying the structure of the target speaker unit. .
- the characteristic value indicating the operation of the target speaker unit is, in this example, a time change of the position of the diaphragm. Therefore, in this example, the Lch target calculation signal Sc1L corresponds to the position of the diaphragm of the target speaker unit.
- the target operation unit 130L gives the audio signal SinL a frequency characteristic (response characteristic) according to the target speaker unit.
- this parameter may not be a value that directly specifies the structure, but may be a parameter that indicates a characteristic obtained according to the structure of the speaker unit.
- a parameter set to be used in the target calculation unit 130L that is, a parameter specifying the structure of the target speaker unit is referred to as an Lch target speaker parameter (first parameter).
- the Lch target speaker parameter is, for example, at least one of parameters (sometimes referred to as TS parameters) that define an equivalent circuit of a target speaker unit (or each structure that configures it).
- the parameters are, for example, mass, spring constant of damper, magnetic flux density, inductance, stiffness, mechanical constant such as mechanical resistance.
- the Lch target speaker parameter may be a damping factor, a resonance frequency or the like which can be calculated by combining these parameters.
- the Lch target speaker parameter may be a characteristic in the time domain (time domain) or a value for controlling this.
- the Lch target speaker parameter is a value for calculating the position (or velocity) of the diaphragm of the target speaker unit, the maximum value of the position of the diaphragm, the impulse response characteristic of the diaphragm, the step response characteristic of the diaphragm, the vibration It may be an impulse response characteristic of the position of the plate, a step response characteristic of the position of the diaphragm, or the like. Further, the Lch target speaker parameter may be each characteristic of the reproduction sound pressure, not each characteristic associated with the above-mentioned diaphragm. In any case, it may be a parameter that affects the position of the diaphragm of the target speaker unit by calculation rather than parameters on a simple frequency domain (center frequency, Q, cut-off, and gain).
- the Rch target speaker parameter (third parameter), the Lch drive speaker parameter (second parameter), and the Rch drive speaker parameter (fourth parameter) corresponding to the Rch target speaker unit (third speaker unit) described later are also included. The same as in the case of Lch target speaker parameters.
- the Lch target calculation signal Sc1L is a characteristic value corresponding to the position of the diaphragm of the target speaker unit, but may be a characteristic value corresponding to the information related to this position.
- the information related to the position may be, for example, the velocity of the diaphragm, current, or the like.
- the characteristic value may be vector information (for example, the position of the diaphragm, current) including information on a plurality of characteristics.
- the calculation in the target calculation unit 130L uses the electro-mechanical model of the target speaker unit, but may use an acoustic (radiation characteristic) model or a space propagation model.
- the Lch target calculation signal Sc1L does not indicate the position of the diaphragm of the target speaker unit, but may indicate the vibration of air at a predetermined position. Even in this case, it can be said that the calculation result relates to the position of the diaphragm.
- the model used for the calculation may include not only linear characteristics but also operations regarding non-linear characteristics.
- the drive signal generation unit 150L includes a signal control unit 151L (first signal control unit), a drive operation unit 153L (second operation unit), an output unit 155L, and an adder 157L.
- the signal control unit 151L receives the Lch target calculation signal Sc1L and the Lch drive calculation signal Sc2L (second calculation signal), and outputs the Lch drive output signal SaL to the adder 157L and the output unit 155L.
- the Lch drive output signal SaL is generated and output so that the Lch target operation signal Sc1L and the Lch drive operation signal Sc2L coincide with each other.
- the Lch drive operation signal Sc2L is a signal generated in the drive operation unit 153L based on the Lch drive output signal SaL and the Rch crosstalk signal SfR.
- the Lch drive calculation signal Sc2L will be described later.
- the output unit 155L outputs the obtained Lch drive output signal SaL to the speaker unit 80L.
- the output unit 155L is a terminal to which the speaker unit 80L is connected.
- the output unit 155L may transmit the Lch drive output signal SaL to an external device via the network.
- the output unit 155L may adjust or amplify the dynamic range of the Lch drive output signal SaL and output the adjusted signal to the speaker unit 80L.
- the Lch drive output signal SaL obtained as described above may have an output level larger than that of the audio signal SinL depending on the content of the calculation. In such a case, the Lch drive output signal SaL may be a signal whose dynamic range is compressed.
- the adder 157L outputs a combined signal obtained by adding the Lch drive output signal SaL output from the signal control unit 151L and the Rch crosstalk signal SfR to the drive operation unit 153L.
- the Rch crosstalk signal SfR is a signal supplied from the crosstalk signal output unit 180 based on the Rch drive output signal SaR output from the speaker R drive unit 100R. More specifically, the Rch crosstalk signal SfR is a signal obtained by delaying and attenuating the Rch drive output signal SaR, and simulates the crosstalk sound when the Rch sound reaches the left ear. Signal.
- Drive arithmetic unit 153L performs calculation using the electro-mechanical model of the speaker unit using the composite signal (Lch drive output signal SaL + Rch crosstalk signal SfR) output from adder 157L as an input signal, and shows Lch indicating the calculation result.
- the driving calculation signal Sc2L is output.
- the speaker unit is hereinafter referred to as a drive speaker unit.
- the calculation performed by the drive calculation unit 153L uses a parameter specifying the structure of the drive speaker unit, and uses characteristic values indicating the operation of the drive speaker unit with the combined signal (Lch drive output signal SaL + Rch crosstalk signal SfR) as an input signal. It is an operation to obtain.
- the Lch drive operation signal Sc2L corresponds to the position of the diaphragm of the drive speaker unit.
- the drive operation unit 153L provides the input signal with frequency characteristics (response characteristics) according to the drive speaker unit.
- the Lch target calculation signal Sc1L and the Lch drive calculation signal Sc2L indicate time variations of the same physical quantity.
- this parameter may not be a value that directly specifies the structure, but may be a parameter that indicates a characteristic obtained according to the structure of the speaker unit.
- parameters set to be used by the drive calculation unit 153L that is, parameters specifying the structure of the drive speaker unit are referred to as Lch drive speaker parameters.
- the driving speaker unit assumes the above-described speaker unit 80L. Therefore, the Lch drive speaker parameter is a value related to the speaker unit 80L. As described later, by making such settings, the sound output from the speaker unit 80L can be made closer to the sound of the target speaker unit.
- the Lch drive speaker parameter may be set as the drive speaker unit as a speaker unit other than the speaker unit 80L in order to impart various unintended acoustic effects although the sound of the target speaker unit is different. .
- the Lch driving speaker parameter is exemplified with the same contents as the Lch target speaker parameter described above, and therefore the description thereof is omitted.
- the calculation in the drive calculation unit 153L may be performed using a model similar to that of the target calculation unit 130L. That is, the calculation process in the target calculation unit 130L and the calculation process in the drive calculation unit 153L have the same model used for the calculation process. Note that although it is not necessary to use the same model for these arithmetic processing, even in this case, the Lch driving arithmetic signal Sc2L and the Lch target arithmetic signal Sc1L are used to facilitate comparison in the signal control unit 151. It is desirable to include characteristic values that correspond to each other.
- each signal be a signal that indicates time change of the same physical quantity.
- the Lch drive operation signal Sc2L is not limited to the position of the diaphragm, but may be a value according to information related to the position of the diaphragm.
- the drive operation unit 153L uses the combined signal output from the adder 157L as an input signal. That is, not only the Lch drive output signal SaL output from the output unit 155L but also a composite signal obtained by further adding the Rch crosstalk signal SfR is input to the drive operation unit 153L. Therefore, it can be said that the drive calculation unit 153L and the adder 157L perform calculation processing for generating a crosstalk signal.
- the signal control unit 151L outputs the Lch drive output signal SaL so that the Lch target calculation signal Sc1L and the Lch drive calculation signal Sc2L coincide with each other.
- a general feedback control (PID control, optimum control, application control, etc.) technique may be used, or a technique similar to digital power control may be used.
- the feedback gain set at the time of feedback control may be updated according to the value of the Lch drive speaker parameter when the Lch drive speaker parameter set in the drive calculation unit 153L is changed.
- the feedback gain may be set to a value determined in advance according to the Lch drive speaker parameter to be set, or a configuration for automatically calculating an appropriate value according to the set Lch drive speaker parameter The value obtained by may be set.
- the Lch drive output signal SaL is output such that the Lch drive operation signal Sc2L corresponding to the drive speaker unit matches the Lch target operation signal Sc1L corresponding to the target speaker unit.
- the drive speaker unit (in this example, the speaker unit 80L) is driven in the same operation as when the target speaker unit is driven by the audio signal SinL. be able to. Furthermore, the drive speaker unit can be driven including a signal for canceling the crosstalk noise of Rch. Therefore, when the Lch drive speaker parameter is specified by the characteristic of the speaker unit 80L, the sound when the audio signal SinL is output using the target speaker unit and the sound for canceling the crosstalk sound are synthesized. Sound is reproduced from the speaker unit 80L.
- FIG. 3B is a block diagram showing the function of the speaker R drive unit in the first embodiment.
- the speaker R drive unit 100R includes an acquisition unit 110R, a target calculation unit 130R (third calculation unit), and a drive signal generation unit 150R (second drive signal generation unit).
- the drive signal generation unit 150R further includes a signal control unit 151R (second signal control unit), a drive operation unit 153R (fourth operation unit), an output unit 155R, and an adder 157R.
- the acquisition unit 110R, the target calculation unit 130R, and the drive signal generation unit 150R operate in the same manner as the acquisition unit 110L, the target calculation unit 130L, and the drive signal generation unit 150L in the speaker L drive unit 100L, respectively.
- each component of the drive signal generation unit 150R operates in the same manner as each component of the drive signal generation unit 150L. Therefore, the detailed description is omitted.
- the difference between the speaker L drive unit 100L and the speaker R drive unit 100R is that the input signals are different. Specifically, it is as follows.
- the acquisition unit 110R acquires the audio signal SinR supplied from the signal input unit 30 as an input signal.
- the signal control unit 151R receives the Rch target calculation signal Sc1R (third calculation signal) and the Rch drive calculation signal Sc2R (fourth calculation signal), and generates and outputs an Rch drive output signal SaR.
- the adder 157R receives the Rch drive output signal SaR and the Lch crosstalk signal SfL, and outputs a combined signal obtained by adding these signals.
- the Lch crosstalk signal SfL is a signal supplied from the crosstalk signal output unit 180 based on the Lch drive output signal SaL output from the speaker L drive unit 100L. More specifically, the Lch crosstalk signal SfL is a signal obtained by delaying and attenuating the Lch drive output signal SaL, and mimics the crosstalk sound when the Lch sound reaches the right ear. Signal.
- the drive calculation unit 153R uses the composite signal output from the adder 157R as an input signal, performs calculation using the electro-mechanical model of the speaker unit, and outputs an Rch drive calculation signal Sc2R indicating the calculation result.
- the output unit 155R outputs the acquired Rch drive output signal SaR to the speaker unit 80R.
- An Rch target speaker parameter (third parameter) corresponding to the target speaker unit is set in the target calculation unit 130R. Further, an Rch drive speaker parameter (fourth parameter) corresponding to the speaker unit 80R is set in the drive calculation unit 153R.
- the Rch target speaker parameter is the same as the Lch target speaker parameter
- the Rch drive speaker parameter is the same as the Lch drive speaker parameter.
- the drive speaker unit (in this example, the speaker unit 80R) is driven in the same operation as when the target speaker unit is driven by the audio signal SinR. be able to. Furthermore, the drive speaker unit can be driven including a signal for canceling the crosstalk noise of Lch. Therefore, when the Rch driving speaker parameter is specified by the characteristic of the speaker unit 80R, the sound when the audio signal SinR is output using the target speaker unit and the sound for canceling the crosstalk sound are synthesized. Sound is reproduced from the speaker unit 80R.
- a sound corresponding to the Lch drive output signal SaL from the speaker L drive unit 100L is output from the speaker unit 80L
- a sound corresponding to the Rch drive output signal SaR from the speaker R drive unit 100R is the speaker unit 80R.
- the crosstalk sound reaching the right ear of the listener from the speaker unit 80L is canceled by the component (corresponding to the Lch crosstalk signal SfL) included in the sound output from the speaker unit 80R.
- the crosstalk sound that reaches the right ear of the listener from the speaker unit 80R is canceled by the component (corresponding to the Rch crosstalk signal SfR) included in the sound output from the speaker unit 80L.
- the delayed Lch sound is subtracted from the sound reproduced from the Rch speaker, and the delayed Rch sound is subtracted from the sound reproduced from the Lch speaker.
- the sound quality may change.
- the speaker driving device 10 in the first embodiment of the present invention as exemplified in the above configuration, introducing a component that cancels the crosstalk sound in consideration of the movement of the diaphragm of the speaker unit. Changes in the frequency characteristics can be suppressed.
- the crosstalk cancellation effect can be obtained in a wide listening range while suppressing the change in sound quality as compared with the case where the conventional transaural system is used, and the localization near the reproduction by the earphone A sense of separation is obtained.
- the setting unit 170 may not be included in the speaker driving device 10.
- the Lch target speaker parameter, the Rch target speaker parameter, the Lch drive speaker parameter, the Rch drive speaker parameter, the delay time and the amplification factor may be set to predetermined values, or an external device etc. It may be set by an instruction from.
- the setting unit 170 includes a parameter storage unit 171, a first UI providing unit 173, a second UI providing unit 175, a third UI providing unit 177, and a setting changing unit 179. Each parameter described above can be designated by the setting unit 170.
- the parameter storage unit 171 stores a template table.
- FIG. 4 is a diagram for explaining a template table in the first embodiment.
- the template table defines combinations of Lch target speaker parameters, Rch target speaker parameters, Lch drive speaker parameters, and parameters set as Rch drive speaker parameters.
- the template “AAA” defines a combination of the parameter A “a1”, the parameter B “b1”,.
- “AAA” is information corresponding to, for example, the model number of the speaker unit.
- the combination of parameters defined by the template “AAA” is the value of each parameter corresponding to the speaker unit of the model number.
- the parameters A, B,... Are, for example, Lch target speaker parameters when they are set in the target calculation unit 130L as parameters of the target speaker unit.
- these parameters A, B,... are set in the drive operation unit 153L as parameters of the drive speaker unit, they become Lch drive speaker parameters.
- the first UI providing unit 173 provides a user interface for specifying the Lch target speaker parameter set in the target calculation unit 130L and the Rch target speaker parameter set in the target calculation unit 130R.
- the second UI providing unit 175 provides a user interface for specifying the Lch drive speaker parameter set in the drive calculation unit 153L and the Rch drive speaker parameter set in the drive calculation unit 153R.
- the third UI providing unit 177 provides a user interface for specifying parameters (delay time, amplification factor) set in the crosstalk signal output unit 180. These user interfaces are realized by the display of the display unit 70 and the reception of the input operation from the operation unit 60.
- FIG. 5 is a diagram for explaining a user interface in the first embodiment. As shown in FIG. 5, on the display unit 70, a first user interface D1, a second user interface D2, and a third user interface D3 are displayed.
- the first user interface D1 is an area for specifying parameters (Lch target speaker parameter, Rch target speaker parameter) related to the target speaker unit.
- the second user interface D2 is an area for designating parameters (Lch drive speaker parameter, Rch drive speaker parameter) related to the drive speaker unit.
- the third user interface D3 is an area for specifying the delay time (Delay) set to the delay units 181L and 181R and the amplification factor (Gain) set to the amplifiers 185L and 185R.
- the selection box SB is an interface capable of selecting a template defined in the template table.
- parameters corresponding to the template are read from the template table and automatically input. It is also possible to correct the read value.
- a predetermined value such as a recommended value may be input in advance.
- the same parameter is set for both Lch and Rch.
- Different parameters may be set for each of Lch and Rch.
- the user interface for Lch and the user interface for Rch may be simultaneously provided in the same screen, or may be switched and provided by a tab or the like.
- the user interface it may be possible to input information in which the deterioration of the speaker unit is assumed. For example, by inputting the use period (for example, year unit) of the speaker unit, the set parameter is corrected to correct the arithmetic processing. For example, the arithmetic processing may be corrected so as to reproduce the phenomenon that the damper becomes harder as the use period becomes longer.
- a user interface may be presented which can input correction information for correcting arithmetic processing by changing parameters such as barometric pressure and humidity.
- the speaker unit 80L and the speaker unit 80R have the same characteristics, they have different characteristics due to manufacturing variations, or differ depending on the environment (such as the peripheral structure) in which the speaker units are arranged. And may have.
- the Lch drive speaker parameter set in the drive calculation unit 153L and the Rch drive speaker parameter set in the drive calculation unit 153R are made different and corrected according to each situation. May be
- the save button BS is an interface for storing values input corresponding to each parameter in the memory as a combination of parameters as in the template.
- the load button BL reads the parameters stored in the memory, and inputs them in correspondence to the respective parameters of the first user interface D1 and the second user interface D2.
- the setting change unit 179 changes the setting based on each input value. Specifically, based on the value input in the first user interface D1, settings of the Lch target speaker parameter in the target calculation unit 130L and the Rch target speaker parameter in the target calculation unit 130R are changed. Further, based on the value input in the second user interface D2, settings of the Lch drive speaker parameter in the drive calculation unit 153L and the Rch drive speaker parameter in the drive calculation unit 153R are changed. Furthermore, the setting of the delay time and the amplification factor in the crosstalk signal output unit 180 is changed based on the value input in the third user interface D3.
- the target speaker unit can be changed by changing the Lch target speaker parameter in the target calculation unit 130L and the Rch target speaker parameter in the target calculation unit 130R.
- the speaker units 80L and 80R are connected to another speaker unit X, the Lch driving speaker parameter and the Rch driving speaker parameter can be changed to the parameters corresponding to the speaker unit X.
- the delay time and amplification factor set in the crosstalk signal output unit 180 may be fixed to predetermined values.
- the delay time and the amplification factor may be determined using a value corresponding to the distance as a recommended value. For example, since the difference in the arrival time of the direct sound and the crosstalk sound becomes larger as the distance between the speaker units is longer, the delay time may be set to be larger.
- the drive speaker unit may be designated by the Lch drive speaker parameter or the Rch drive speaker parameter according to the structure other than the speaker units 80L and 80R.
- the sound when the audio signal SinL, SinR is output using the target speaker unit is given a sound effect such as an acoustic effect according to the designated parameter from the speaker units 80L, 80L. It can also be output.
- the Lch drive speaker parameter and the Rch drive speaker parameter are set corresponding to the same characteristic of the speaker unit, they may not necessarily be the same.
- a speaker device 1A using an Lch driving operation signal Sc2L and an Rch driving operation signal Sc2R as signals for canceling crosstalk noise will be described.
- the speaker driving device 10A in particular, the speaker L driving unit 100AL, the speaker R driving unit 100AR, and the crosstalk signal output unit 180A will be described.
- FIG. 6 is a block diagram showing the function of the speaker device in the second embodiment.
- the speaker device 1A includes a speaker drive device 10A, a signal input unit 30, an operation unit 60, a display unit 70, and speaker units 80L and 80R.
- the speaker driving device 10A includes a speaker L driving unit 100AL, a speaker R driving unit 100AR, a setting unit 170, and a crosstalk signal output unit 180A.
- the signal input unit 30, the operation unit 60, the display unit 70, the speaker units 80L and 80R, and the setting unit 170 in this example perform the same processing as in the first embodiment. Therefore, the description of these configurations is omitted.
- the speaker L drive unit 100AL receives the audio signal SinL and the Rch crosstalk signal Sf2R (sixth operation signal), and outputs an Lch drive output signal SaL and an Lch drive operation signal Sc2L based on these signals.
- the speaker R drive unit 100AR receives the audio signal SinR and the Lch crosstalk signal Sf2L (fifth operation signal), and outputs an Rch drive output signal SaR and an Rch drive operation signal Sc2R based on these signals.
- the Lch crosstalk signal Sf2L and the Rch crosstalk signal Sf2R are signals output from the crosstalk signal output unit 180A based on the Lch drive operation signal Sc2L and the Rch drive operation signal Sc2R.
- the crosstalk signal output unit 180A is different from the crosstalk signal output unit 180 in the first embodiment in the input signal, but there is no big difference in the basic configuration, and it is the same as the configuration shown in FIG. It is.
- the crosstalk signal output unit 180A performs a delay process with a set delay time and an amplification process (attenuation process in this example) with a set amplification factor to the Lch drive operation signal Sc2L, and performs Lch cross. It is output as the talk signal Sf2L.
- the crosstalk signal output unit 180A performs delay processing for the set delay time and amplification processing for the set amplification factor (processing to be attenuated in this example) on the Rch drive operation signal Sc2R, It is output as the Rch crosstalk signal Sf2R.
- FIG. 7A is a block diagram showing the function of the speaker L drive unit in the second embodiment.
- the speaker L drive unit 100AL includes an acquisition unit 110L, a target calculation unit 130L, and a drive signal generation unit 150AL.
- the acquisition unit 110L and the target calculation unit 130L perform the same processing as in the first embodiment. Therefore, the description of these configurations is omitted.
- the drive signal generation unit 150AL includes a signal control unit 151AL, a drive operation unit 153AL, an output unit 155L, and an adder 158L.
- the output unit 155L performs the same processing as that of the first embodiment. Therefore, the description of this configuration is omitted.
- the drive operation unit 153AL is different from the drive operation unit 153L in the first embodiment in the input signal, but the content of the operation process is the same. That is, the drive operation unit 153AL performs operation using the Lch drive output signal SaL output from the signal control unit 151AL as an input signal, and outputs an Lch drive operation signal Sc2L indicating the operation result.
- the Lch driving operation signal Sc2L is also output to the crosstalk signal output unit 180A.
- the adder 158L outputs, to the signal control unit 151L, a composite signal obtained by adding the Lch drive operation signal Sc2L output from the drive operation unit 153AL and the Rch crosstalk signal Sf2R.
- the Rch crosstalk signal Sf2R is a signal supplied from the crosstalk signal output unit 180A based on the Rch driving operation signal Sc2R output from the speaker R driving unit 100AR. More specifically, the Rch crosstalk signal Sf2R is a signal obtained by delaying and attenuating the Rch driving operation signal Sc2R, and the crosstalk sound when the Rch sound reaches the left ear is a speaker unit. It is a signal shown by the vibration of the diaphragm of 80R.
- the signal control unit 151AL is different from the signal control unit 151L in the first embodiment in the signal to be compared with the Lch target operation signal Sc1L.
- the comparison target of the Lch target operation signal Sc1L is not the Lch drive operation signal Sc2L as in the first embodiment, but a synthesized signal output from the adder 158L.
- the contents of processing for the signal control unit 151AL to output the Lch drive output signal SaL are the same. That is, the signal control unit 151AL outputs the Lch drive output signal SaL so that the combined signal (Lch drive operation signal Sc2L + Rch crosstalk signal Sf2R) output from the adder 158L matches the Lch target operation signal Sc1L. .
- the drive speaker unit (in this example, the speaker unit 80L) is driven in the same operation as when the target speaker unit is driven by the audio signal SinL. be able to. Furthermore, the drive speaker unit can be driven including a signal for canceling the crosstalk noise of Rch. At this time, since the Rch crosstalk signal Sf2R is added to the Lch drive operation signal Sc2L, the diaphragm of the Lch drive speaker unit moves the diaphragm of the Rch drive speaker unit to cancel the crosstalk sound.
- FIG. 7B is a block diagram showing the function of the speaker R drive unit in the second embodiment.
- the speaker R drive unit 100AR includes an acquisition unit 110R, a target calculation unit 130R, and a drive signal generation unit 150AR.
- the drive signal generation unit 150AR also includes a signal control unit 151AR, a drive operation unit 153AR, an output unit 155R, and an adder 158R.
- the acquisition unit 110R, the target calculation unit 130R, and the drive signal generation unit 150AR operate similarly to the acquisition unit 110L, the target calculation unit 130L, and the drive signal generation unit 150AL in the speaker L drive unit 100AL. Further, each component of the drive signal generation unit 150AR also operates in the same manner as each component of the drive signal generation unit 150AL. Therefore, the detailed description is omitted.
- the difference between the speaker L drive unit 100AL and the speaker R drive unit 100AR is that the input signals are different. Specifically, it is as follows.
- the acquisition unit 110R acquires the audio signal SinR supplied from the signal input unit 30 as an input signal.
- the signal control unit 151AR receives the Rch target operation signal Sc1R and the combined signal (Rch drive operation signal Sc2R + Lch crosstalk signal Sf2L) output from the adder 158R, and generates and outputs an Rch drive output signal SaR.
- the drive operation unit 153AR performs an operation using the Rch drive output signal SaR output from the signal control unit 151AR as an input signal, and outputs an Rch drive operation signal Sc2R indicating the operation result.
- the adder 158R receives the Rch driving operation signal Sc2R and the Lch crosstalk signal Sf2L, and outputs a synthesized signal obtained by adding these signals.
- the Lch crosstalk signal Sf2L is a signal supplied from the crosstalk signal output unit 180A based on the Lch drive operation signal Sc2L output from the speaker L drive unit 100AL. More specifically, the Lch crosstalk signal Sf2L is a signal obtained by delaying and attenuating the Lch drive operation signal Sc2L, and the crosstalk sound when the Lch sound reaches the right ear, This is a signal indicated by the vibration of the diaphragm of the speaker unit 80L.
- the output unit 155R outputs the acquired Rch drive output signal SaR to the speaker unit 80R.
- the drive speaker unit (in this example, the speaker unit 80R) is driven in the same operation as when the target speaker unit is driven by the audio signal SinR. be able to. Furthermore, the drive speaker unit can be driven including a signal for canceling the crosstalk noise of Lch. At this time, since the Lch crosstalk signal Sf2L is added to the Rch drive operation signal Sc2R, the diaphragm of the Lch drive speaker unit is moved to the diaphragm of the Rch drive speaker unit to cancel the crosstalk sound.
- a sound corresponding to the Lch drive output signal SaL from the speaker L drive unit 100AL is output from the speaker unit 80L
- a sound corresponding to the Rch drive output signal SaR from the speaker R drive unit 100AR is the speaker unit 80R.
- the crosstalk sound that reaches the right ear of the listener from the speaker unit 80L is a component included in the sound output from the speaker unit 80R (a component generated by the vibration of the diaphragm corresponding to the Lch crosstalk signal Sf2L). , Will be canceled.
- the crosstalk sound that reaches the listener's right ear from the speaker unit 80R is determined by the component included in the sound output from the speaker unit 80L (the component generated by the vibration of the diaphragm corresponding to the Rch crosstalk signal Sf2R). It is canceled.
- the speaker driving device 10A in the second embodiment of the present invention by introducing a component that cancels the crosstalk sound in consideration of the movement of the diaphragm of the speaker unit, Changes in frequency characteristics can be suppressed.
- the crosstalk sound component is reproduced by Lch drive operation signal Sc2L corresponding to the vibration of the diaphragm, Lch crosstalk signal Sf2L obtained from Rch drive operation signal Sc2R, and Rch crosstalk signal Sf2R. According to this, even if the speaker unit 80L and the speaker unit 80R have different characteristics, the effect of canceling the crosstalk sound can be easily obtained.
- FIG. 8 is an external view showing a tablet computer according to the third embodiment.
- the tablet computer 90 includes an input / output terminal 11, an operation unit 60, a display unit 70, and a speaker unit 80.
- the tablet computer 90 also includes a control unit 1000 and a storage unit 500.
- the control unit 1000 has an arithmetic processing circuit such as a CPU, executes a program stored in the storage unit 500, and realizes each function of the speaker driving device 10 shown in FIG. 1 on software. That is, this program causes the tablet computer 90 to function as the speaker drive device 10.
- the program may be installed in advance on the tablet computer 90, or may be obtained from an external memory or downloaded via a network.
- the signal input unit 30 may acquire the audio signal Sin from the input / output terminal 11, or may acquire the audio signal Sin generated by the control unit 1000.
- the output units 155L and 155R output the Lch drive output signal SaL and the Rch drive output signal SaR to the input / output terminal 11 instead of the speaker units 80L and 80R. May be At this time, the Lch drive speaker parameter set in the drive calculation unit 153L and the Rch drive speaker parameter set in the drive calculation unit 153R may be automatically changed.
- the Lch driving speaker parameter and the Rch driving speaker parameter after the change may be set to values corresponding to the headphones.
- the Lch driving speaker parameter and the Rch driving speaker parameter may not necessarily have values corresponding to the headphones connected to the input / output terminal 11.
- the input and output terminals 11 share the input and output terminals, but may be separately provided.
- the speaker drive device 10 may be configured to obtain identification information from headphones.
- the Lch drive speaker parameter set in the drive calculation unit 153L and the Rch drive speaker parameter set in the drive calculation unit 153R may be changed based on the identification information.
- crosstalk signal output unit 180 performs delay processing and amplification processing on each of Lch drive output signal SaL and Rch drive output signal SaR to be input, and transmits Lch crosstalk signal SfL and Rch cross.
- the talk signal SfR was output.
- the Lch crosstalk signal SfL and the Rch crosstalk signal SfR are output by convolving a predetermined transfer function with each of the Lch drive output signal SaL and the Rch drive output signal SaR that are input.
- FIG. 9 is a block diagram showing the function of the crosstalk signal output unit in the fourth embodiment.
- the crosstalk signal output unit 180B includes an Lch filter unit 183L (fifth operation unit) and an Rch filter unit 183R (sixth operation unit).
- the Lch filter unit 183L subjects the Lch drive output signal SaL to convolution processing using the set transfer function, and outputs the result as an Lch crosstalk signal SfL (third drive signal).
- the Rch filter unit 183R subjects the Rch drive output signal SaR to convolution processing using a set transfer function, and outputs the result as an Rch crosstalk signal SfR (fourth drive signal).
- Each transfer function is, for example, a head transfer function.
- a signal for canceling crosstalk may be generated by convolving a predetermined transfer function.
- Each function of the speaker driving device 10 may be realized by an analog circuit or a digital circuit.
- the Lch drive output signal SaL and the Rch drive output signal SaR output from the speaker drive device 10 may be output to another device via the network.
- the speaker driving device 10 may be realized in a server connected to a network.
- the speaker driver 10 functioning in the server receives the audio signal Sin from the communication terminal or the like via the network, and outputs the Lch drive output signal SaL and the Rch drive output signal SaR via the network to the speaker unit. Send to a device equipped or a device connectable to this device.
- the audio signal Sin may have two or more channels.
- a plurality of speaker driving devices 10 may be used according to the number of channels.
- the audio signal Sin may have, for example, four channels of Lch and Rch on the front and Lch and Rch on the rear.
- the speaker device 1 includes a first speaker drive device 10 to which audio signals of Lch and Rch at the front are supplied and a second speaker drive to which audio signals of Lch and Rch at the rear are supplied.
- the device 10 may be provided.
- the propagation time difference from the plurality of speaker units corresponding to each channel to the back ear is The crosstalk signal with a corresponding delay amount may be superimposed on the speaker model in the feedback loop in the drive signal generation unit of the other channel.
- Lch and Rch are driven by two speaker units (temporarily L1, L2, R1, and R2, respectively), a speaker L1 driver that outputs a drive output signal to a corresponding speaker unit, and a speaker L2 drive.
- a speaker R1 drive unit and a speaker R2 drive unit may be driven by two speaker units (temporarily L1, L2, R1, and R2, respectively).
- the crosstalk signal may be input by any of the following (A) to (C).
- Rch as Lch.
- (A) The crosstalk signal from the speaker R1 drive unit is supplied to the speaker L1 drive unit, and the crosstalk signal from the speaker R2 drive unit is supplied to the speaker L2 drive unit.
- (B) The crosstalk signal from the speaker R2 drive unit is supplied to the speaker L1 drive unit, and the crosstalk signal from the speaker R1 drive unit is supplied to the speaker L2 drive unit.
- C The crosstalk signal from the speaker R1 drive unit and the crosstalk signal from the speaker R2 drive unit are supplied to one of the speaker L1 drive unit and the speaker L2 drive unit.
- the Lch drive output signal SaL in the first embodiment is phase-adjusted and supplied to each of the L1 and L2 speaker units, and each of the R1 and R2 speaker units is supplied in the first embodiment.
- the Rch drive output signal SaR may be phase adjusted and supplied. Also in this case, substantially the same effect as in the first embodiment can be obtained only by changing the directivity of the sound. That is, the crosstalk sound from the speaker units R1 and R2 can be canceled by the sound from the speaker units L1 and L2 driven by the Lch drive output signal SaL. Further, the crosstalk sound from the L1 and L2 speaker units can be canceled by the sound from the R1 and R2 speaker units driven by the Rch drive output signal SaR.
- one voice unit may be driven by a plurality of voice coils.
- a plurality of drive output signals are used for one speaker unit. That is, Lch drive output signal SaL and Rch drive output signal SaR each include drive output signals of the number corresponding to the voice coil.
- the drive calculation unit 153L may obtain the position of the diaphragm corresponding to the drive speaker unit using a plurality of signals included in the Lch drive output signal SaL.
- the drive calculation unit 153R may obtain the position of the diaphragm corresponding to the drive speaker unit using a plurality of signals included in the Rch drive output signal SaR. Then, the Lch speaker unit is driven by a plurality of signals included in the Lch drive output signal SaL, and the Rch speaker unit is driven by a plurality of signals included in the Rch drive output signal SaR.
- a known technology may be used for a digital speaker device that drives one speaker unit with a plurality of voice coils.
- the known techniques for example, the techniques disclosed in US Pat. Nos. 8423165, 8306244, 9219960, and 9303010 can be used.
- a noise shaper using a ⁇ modulator and a mismatch shaper that selects a voice coil that distributes drive signals so as to reduce variations are used.
- the target of the electro-mechanical model in the target calculation units 130L and 130R and the drive calculation units 153L and 153R and the target to be driven based on the electric signals are Although it was a speaker unit (speaker units 80L and 80R), any object that can be described by a differential equation, such as an object that converts an electrical signal into an operation such as position or speed of a machine May be As an object that can be described by a differential equation, for example, an electromechanical transducer such as a motor, a piezoelectric element, a magnetostrictive element, or an electrostatic actuator is applicable to the present invention.
- electromechanical transducers are not limited to the configuration that outputs an audible sound by vibration, and can also be applied as a configuration that outputs a vibration in a frequency band other than an audible sound. Therefore, the speaker drive device can be said to be an example of a drive device for an electromechanical transducer.
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Abstract
Description
[1.スピーカ装置の概要]
図1は、第1実施形態におけるスピーカ装置の機能を示すブロック図である。スピーカ装置1は、スピーカ駆動装置10、信号入力部30、操作部60、表示部70およびスピーカユニット80L、80Rを備える。
図1に示すように、スピーカ駆動装置10は、スピーカL駆動部100L、スピーカR駆動部100R、設定部170およびクロストーク信号出力部180を備える。スピーカL駆動部100Lは、オーディオ信号SinLおよびRchクロストーク信号SfR(第4駆動信号)が入力され、これらの信号に基づいてLch駆動出力信号SaLを出力する。スピーカR駆動部100Rは、オーディオ信号SinRおよびLchクロストーク信号SfL(第3駆動信号)が入力され、これらの信号に基づいてRch駆動出力信号SaRを出力する。なお、Lchクロストーク信号SfL、Rchクロストーク信号SfRは、Lch駆動出力信号SaL、Rch駆動出力信号SaRに所定の演算処理が行われてクロストーク信号出力部180から出力される信号である。
図2は、第1実施形態におけるクロストーク信号出力部の機能を示すブロック図である。クロストーク信号出力部180は、Lch信号処理部180L(第5演算部)およびRch信号処理部180R(第6演算部)を備える。
図3Aは、第1実施形態におけるスピーカL駆動部の機能を示すブロック図である。スピーカL駆動部100Lは、取得部110L、目標演算部130L(第1演算部)および駆動信号生成部150L(第1駆動信号生成部)を備える。取得部110Lは、信号入力部30から供給されるオーディオ信号SinLを入力信号として取得する。
目標演算部130Lは、取得部110Lによって取得されたオーディオ信号SinLを用いて、スピーカユニットの電気-機械モデルによる演算を行い、演算結果を示すLch目標演算信号Sc1L(第1演算信号)を出力する。このスピーカユニットは、上述したスピーカユニット80Lではなく、Lchの目標スピーカユニット(第1スピーカユニット)である。目標演算部130Lが行う演算は、目標スピーカユニットの構造を特定するパラメータを用いて、オーディオ信号SinLを入力信号とした目標スピーカユニットの動作(内部状態)を示す特性値を得るための演算である。
目標演算部130Lにおける演算は、目標スピーカユニットの電気-機械モデルを用いていたが、さらに音響(放射特性)モデルを用いてもよいし、空間伝搬モデルを用いてもよい。この場合には、Lch目標演算信号Sc1Lは、目標スピーカユニットの振動板の位置を示すものではなく、所定位置で空気の振動を示すものなどであってもよい。この場合であっても、振動板の位置に関連した演算結果といえる。演算に用いるモデルには、線形特性のみではなく、非線形特性に関する演算が含まれていてもよい。
Karsten Oyen, "Compensation of Loudspeaker Nonlinearities -DSP implementation", [online], Master of Science in Electronics, Norwegian University of Science and Technology Department of Electronics and Telecommunications, August 2007, p.21-27, [平成28年4月11日検索]、インターネット〈URL:http://www.diva-portal.org/smash/get/diva2:347578/FULLTEXT01.pdf〉
駆動信号生成部150Lは、信号制御部151L(第1信号制御部)、駆動演算部153L(第2演算部)、出力部155Lおよび加算器157Lを備える。信号制御部151Lは、Lch目標演算信号Sc1LおよびLch駆動演算信号Sc2L(第2演算信号)が入力され、Lch駆動出力信号SaLを加算器157Lおよび出力部155Lに出力する。Lch駆動出力信号SaLは、Lch目標演算信号Sc1LとLch駆動演算信号Sc2Lとが一致するように生成されて出力される。Lch駆動演算信号Sc2Lは、Lch駆動出力信号SaLおよびRchクロストーク信号SfRに基づいて駆動演算部153Lにおいて生成される信号である。Lch駆動演算信号Sc2Lについては、後述する。
図3Bは、第1実施形態におけるスピーカR駆動部の機能を示すブロック図である。スピーカR駆動部100Rは、取得部110R、目標演算部130R(第3演算部)および駆動信号生成部150R(第2駆動信号生成部)を備える。また、駆動信号生成部150Rは、信号制御部151R(第2信号制御部)、駆動演算部153R(第4演算部)、出力部155Rおよび加算器157Rを備える。取得部110R、目標演算部130Rおよび駆動信号生成部150Rは、それぞれ、スピーカL駆動部100Lにおける取得部110L、目標演算部130Lおよび駆動信号生成部150Lと同様の動作をする。また、駆動信号生成部150Rの各構成についても、駆動信号生成部150Lの各構成と同様の動作をする。したがって、詳細の説明を省略する。スピーカL駆動部100LとスピーカR駆動部100Rとで異なる点は、入力される信号が異なる点である。具体的には、以下の通りである。
続いて、設定部170について説明する。設定部170は、スピーカ駆動装置10に含まれていなくてもよい。この場合には、上述したLch目標スピーカパラメータ、Rch目標スピーカパラメータ、Lch駆動スピーカパラメータ、Rch駆動スピーカパラメータ、遅延時間および増幅率が予め決められた値に設定されていてもよいし、外部装置等からの指示により設定されてもよい。
第2実施形態においては、クロストーク音をキャンセルするための信号として、Lch駆動演算信号Sc2LおよびRch駆動演算信号Sc2Rを用いるスピーカ装置1Aについて説明する。以下、スピーカ装置1Aの各構成のうち、第1実施形態におけるスピーカ装置1とは処理の内容が異なる構成について説明し、同様の処理を行う構成については、その説明を省略する場合がある。ここでは、スピーカ駆動装置10A、特に、スピーカL駆動部100AL、スピーカR駆動部100ARおよびクロストーク信号出力部180Aについて説明する。
第3実施形態では、上記実施形態におけるスピーカ装置をコンピュータによりソフトウェア上で実現する例を説明する。この例では、第1実施形態におけるスピーカ装置1がタブレット型コンピュータ90に適用された例を説明する。
第1実施形態では、クロストーク信号出力部180は、入力されるLch駆動出力信号SaLおよびRch駆動出力信号SaRのそれぞれに対して遅延処理および増幅処理をして、Lchクロストーク信号SfLおよびRchクロストーク信号SfRを出力していた。第4実施形態では、入力されるLch駆動出力信号SaLおよびRch駆動出力信号SaRのそれぞれに対して所定の伝達関数を畳み込むことによって、Lchクロストーク信号SfLおよびRchクロストーク信号SfRを出力する。
以上、本発明の一実施形態について説明したが、上述した各実施形態は、互いに組み合わせたり、置換したりして適用することが可能である。また、上述した各実施形態では、以下の通り変形して実施することも可能である。なお、以下の記載では、第1実施形態を基準に変形した例を示しているが、その他の実施形態を基準としても変形が可能である。
(A)スピーカR1駆動部からのクロストーク信号がスピーカL1駆動部に供給され、スピーカR2駆動部からのクロストーク信号がスピーカL2駆動部に供給される。
(B)スピーカR2駆動部からのクロストーク信号がスピーカL1駆動部に供給され、スピーカR1駆動部からのクロストーク信号がスピーカL2駆動部に供給される。
(C)スピーカR1駆動部からのクロストーク信号と、スピーカR2駆動部からのクロストーク信号とが、スピーカL1駆動部およびスピーカL2駆動部のいずれか一方に供給される。
Claims (12)
- 第1スピーカユニットの等価回路を規定する第1パラメータに応じた応答特性に基づいて、第1入力信号から得られる第1演算信号を出力する第1演算部と、
第2駆動信号および前記第1演算信号に基づいて、スピーカユニットを駆動するための第1駆動信号を生成する第1駆動信号生成部と、
第3スピーカユニットの等価回路を規定する第3パラメータに応じた応答特性に基づいて、第2入力信号から第3演算信号を生成する第3演算部と、
前記第1駆動信号および前記第3演算信号に基づいて、スピーカユニットを駆動するための前記第2駆動信号を生成する第2駆動信号生成部と、
を備えることを特徴とするスピーカ駆動装置。 - 第1スピーカユニットの等価回路を規定する第1パラメータに応じた応答特性に基づいて、第1入力信号から得られる第1演算信号を出力する第1演算部と、
第4演算信号および前記第1演算信号に基づいて、前記第1演算信号に対応する特性値を含む第2演算信号およびスピーカユニットを駆動するための第1駆動信号を生成する第1駆動信号生成部と、
第3スピーカユニットの等価回路を規定する第3パラメータに応じた応答特性に基づいて、第2入力信号から第3演算信号を生成する第3演算部と、
前記第2演算信号および前記第3演算信号に基づいて、前記第3演算信号に対応する特性値を含む前記第4演算信号およびスピーカユニットを駆動するための第2駆動信号を生成する第2駆動信号生成部と、
を備えることを特徴とするスピーカ駆動装置。 - 前記第1駆動信号に対する第1演算処理によって第3駆動信号を生成する第5演算部と、
前記第2駆動信号に対する第2演算処理によって第4駆動信号を生成する第6演算部と、
をさらに備え、
前記第1駆動信号生成部は、前記第4駆動信号および前記第1演算信号に基づいて、前記第1駆動信号を生成し、
前記第1駆動信号生成部は、
第2スピーカユニットの等価回路を規定する第2パラメータに応じた応答特性に基づいて、前記第1駆動信号と前記第4駆動信号とを合成した信号から第2演算信号を生成する第2演算部と、
前記第1演算信号および前記第2演算信号に基づいて、前記第1駆動信号を制御する第1信号制御部と、を含み、
前記第2駆動信号生成部は、前記第3駆動信号および前記第3演算信号に基づいて、前記第2駆動信号を生成し、
前記第2駆動信号生成部は、
第4スピーカユニットの等価回路を規定する第4パラメータに応じた応答特性に基づいて、前記第2駆動信号と前記第3駆動信号とを合成した信号から第4演算信号を生成する第4演算部と、
前記第3演算信号および前記第4演算信号に基づいて、前記第2駆動信号を制御する第2信号制御部と、を含む
ことを特徴とする請求項1に記載のスピーカ駆動装置。 - 前記第2演算信号に対する第1演算処理によって第5演算信号を生成する第5演算部と、
前記第4演算信号に対する第2演算処理によって第6演算信号を生成する第6演算部と、
をさらに備え、
前記第1駆動信号生成部は、前記第1演算信号および前記第6演算信号に基づいて、前記第2演算信号および前記第1駆動信号を生成し、
前記第1駆動信号生成部は、
第2スピーカユニットの等価回路を規定する第2パラメータに応じた応答特性に基づいて、前記第1駆動信号から前記第2演算信号を生成する第2演算部と、
前記第2演算信号と前記第6演算信号との合成信号および前記第1演算信号に基づいて、前記第1駆動信号を制御する第1信号制御部と、を含み、
前記第2駆動信号生成部は、前記第3演算信号および前記第5演算信号に基づいて、前記第4演算信号および前記第2駆動信号を生成し、
前記第2駆動信号生成部は、
第4スピーカユニットの等価回路を規定する第4パラメータに応じた応答特性に基づいて、前記第2駆動信号から前記第4演算信号を生成する第4演算部と、
前記第4演算信号と前記第5演算信号との合成信号および前記第3演算信号に基づいて、前記第2駆動信号を制御する第2信号制御部と、を含む
ことを特徴とする請求項2に記載のスピーカ駆動装置。 - 前記第1演算処理および前記第2演算処理は、遅延処理および減衰処理を含む
ことを特徴とする請求項3または請求項4に記載のスピーカ駆動装置。 - 前記第1演算処理および前記第2演算処理は、所定の伝達関数を畳み込む処理を含む
ことを特徴とする請求項3または請求項4に記載のスピーカ駆動装置。 - 前記第1パラメータと前記第2パラメータとは同一に設定可能であることを特徴とする請求項3から請求項6のいずれかに記載のスピーカ駆動装置。
- 前記第3パラメータと前記第4パラメータとは同一に設定可能であることを特徴とする請求項3から請求項7のいずれかに記載のスピーカ駆動装置。
- 前記第1演算信号、前記第2演算信号、前記第3演算信号および前記第4演算信号は、スピーカユニットの振動板の位置に関連する情報を含む
ことを特徴とする請求項3から請求項8のいずれかに記載のスピーカ駆動装置。 - 請求項1から請求項9のいずれかに記載のスピーカ駆動装置と、
前記第1駆動信号および前記第2駆動信号のそれぞれによって駆動される複数のスピーカユニットと、
を備えることを特徴とするスピーカ装置。 - 第1スピーカユニットの等価回路を規定する第1パラメータに応じた応答特性に基づいて、第1入力信号から得られる第1演算信号を出力する第1演算部と、
第2駆動信号および前記第1演算信号に基づいて、スピーカユニットを駆動するための第1駆動信号を生成する第1駆動信号生成部と、
第3スピーカユニットの等価回路を規定する第3パラメータに応じた応答特性に基づいて、第2入力信号から第3演算信号を生成する第3演算部と、
前記第1駆動信号および前記第3演算信号に基づいて、スピーカユニットを駆動するための前記第2駆動信号を生成する第2駆動信号生成部
としてコンピュータを機能させるためのプログラム。 - 第1スピーカユニットの等価回路を規定する第1パラメータに応じた応答特性に基づいて、第1入力信号から得られる第1演算信号を出力する第1演算部と、
第4演算信号および前記第1演算信号に基づいて、前記第1演算信号に対応する特性値を含む第2演算信号およびスピーカユニットを駆動するための第1駆動信号を生成する第1駆動信号生成部と、
第3スピーカユニットの等価回路を規定する第3パラメータに応じた応答特性に基づいて、第2入力信号から第3演算信号を生成する第3演算部と、
前記第2演算信号および前記第3演算信号に基づいて、前記第3演算信号に対応する特性値を含む前記第4演算信号およびスピーカユニットを駆動するための第2駆動信号を生成する第2駆動信号生成部
としてコンピュータを機能させるためのプログラム。
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