WO2009154067A1 - デジタルスピーカー駆動装置 - Google Patents

デジタルスピーカー駆動装置 Download PDF

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Publication number
WO2009154067A1
WO2009154067A1 PCT/JP2009/059867 JP2009059867W WO2009154067A1 WO 2009154067 A1 WO2009154067 A1 WO 2009154067A1 JP 2009059867 W JP2009059867 W JP 2009059867W WO 2009154067 A1 WO2009154067 A1 WO 2009154067A1
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WIPO (PCT)
Prior art keywords
digital
signal
speaker
digital signal
digital speaker
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2009/059867
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English (en)
French (fr)
Japanese (ja)
Inventor
淳一 岡村
彰 安田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Trigence Semiconductor
Trigence Semiconductor Inc
Original Assignee
Trigence Semiconductor
Trigence Semiconductor Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Trigence Semiconductor, Trigence Semiconductor Inc filed Critical Trigence Semiconductor
Priority to EP09766515.2A priority Critical patent/EP2187657A4/en
Priority to CN200980100413.4A priority patent/CN101803401B/zh
Publication of WO2009154067A1 publication Critical patent/WO2009154067A1/ja
Priority to US12/659,813 priority patent/US8306244B2/en
Anticipated expiration legal-status Critical
Priority to US13/665,320 priority patent/US9226053B2/en
Priority to US14/919,349 priority patent/US9693136B2/en
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/211—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/217—Class D power amplifiers; Switching amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/005—Details of transducers, loudspeakers or microphones using digitally weighted transducing elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers
    • H04R3/12—Circuits for transducers for distributing signals to two or more loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1008—Earpieces of the supra-aural or circum-aural type
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R15/00—Magnetostrictive transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2227/00—Details of public address [PA] systems covered by H04R27/00 but not provided for in any of its subgroups
    • H04R2227/003—Digital PA systems using, e.g. LAN or internet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2400/00—Loudspeakers
    • H04R2400/11—Aspects regarding the frame of loudspeaker transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2430/00—Signal processing covered by H04R, not provided for in its groups
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/15—Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R27/00—Public address systems

Definitions

  • the present invention relates to a digital speaker driving device, a digital speaker device, an actuator, a flat display device, and a portable electronic device. More specifically, the present invention relates to a digital sound system using a digital speaker device that directly converts a digital signal into analog sound and its application.
  • WO2007 / 135828A1 two digital audio signals X (L) and Y (R) are input, and a circuit that outputs a plurality of digital signals by a ⁇ modulator and a mismatch shaping filter circuit, and the plurality of digital signals A method of directly converting analog sound by a plurality of speakers or a plurality of driving elements to be driven is shown.
  • Digital speaker devices that use digital speaker technology that directly converts digital signals to analog audio are characterized by low power consumption compared to analog speaker devices that are driven by analog electrical signals. Because it uses multiple speaker elements or multiple drive elements (coils, etc.), it produces a large sound pressure with a low drive voltage compared to conventional speakers using a single speaker element or a single drive element. Is possible.
  • the conventional speaker device is premised on inputting an analog signal
  • the digital speaker device in order to incorporate the digital speaker device into a conventional digital sound system, the input analog signal is converted into a digital signal. Therefore, there was a big problem in realizing a digital sound system using a digital speaker device.
  • FIG. 1a shows a first embodiment of a digital sound system using a digital signal source and an analog speaker device.
  • a signal from a digital signal source is converted into an analog signal by a D / A converter, and after being amplified by an analog amplifier, is input to an analog speaker device.
  • Matching with a conventional analog amplifier and a sound system using a speaker is the best embodiment.
  • FIG. 1b shows a second embodiment of a digital sound system using a digital signal source and an analog speaker device.
  • a signal from a digital signal source is converted into an analog signal by a D / A converter and input to an amplifier.
  • an input analog signal is converted into a digital signal by an A / D converter, and after PWM modulation, digital amplitude amplification (D class amplification) is performed, and then a D / A converter (usually (LC filter) is converted into an analog signal and input to an analog speaker device.
  • D class amplification digital amplitude amplification
  • LC filter usually (LC filter
  • FIG. 1c shows a third embodiment of a digital sound system using a digital signal source and an analog speaker device.
  • the signal from the digital signal source is input directly to the amplifier as a digital signal.
  • the input digital signal is PWM-modulated and then subjected to digital amplitude amplification (D class amplification), then converted to an analog signal by a D / A converter (usually an LC filter), and input to the analog speaker device.
  • D class amplification digital amplitude amplification
  • a D / A converter usually an LC filter
  • FIG. 1b and FIG. 1c after digital amplitude amplification (D-class amplification), it is converted into an analog signal by a D / A converter (usually an LC filter) and input to an analog speaker device, but a large sound pressure is produced.
  • a D / A converter usually an LC filter
  • the digital amplitude amplification must be driven at a high voltage, and a semiconductor element for digital amplitude amplification using a special semiconductor technology for high voltage is necessary, and there is a problem that it is difficult to reduce the cost.
  • EMI electromagnetic radiation
  • the present invention is most suitable for a circuit that outputs a plurality of digital signals by a ⁇ modulator and a mismatch shaping filter circuit, and a digital speaker device that directly converts analog sound by one or a plurality of speakers driven by the plurality of digital signals. Disclose digital sound systems and the like.
  • a digital speaker driving apparatus that drives a digital speaker having s number of digital signal terminals, a ⁇ modulator that modulates a digital input signal and outputs an n-bit digital signal, and a ⁇ modulator A post-filter for outputting an m-bit digital signal obtained by mismatch-shaping an n-bit digital signal, and s number of drive circuits each receiving a part of the m-bit digital signal and outputting a digital signal
  • the digital speaker driving device is disclosed in which s driving circuits correspond to s digital signal terminals.
  • the power supply circuit provided in the digital speaker driving device adjusts the amplitude of the output of the digital signal of the s drive circuits by supplying a variable voltage to the s drive elements. Furthermore, it is desirable to have a digital attenuator that adjusts the volume of the digital speaker by performing predetermined arithmetic processing on the digital input signal and inputting it to the ⁇ modulator. Further, it is desirable to control the power supply circuit in response to the digital input signal.
  • a digital speaker driving apparatus connected to a digital signal terminal of a digital speaker, a first output circuit connected to a first input terminal of the digital signal terminal of the digital speaker, and the digital speaker Inverted signals are supplied to the second output circuit connected to the second input terminal paired with the first input terminal of the digital signal terminal, and the first output circuit and the second output circuit.
  • a digital speaker driving apparatus is disclosed.
  • both the first output circuit and the second output circuit output a signal composed of the first, second, and third voltages, the first output circuit outputs the first voltage, and the second output.
  • the circuit outputs the third voltage
  • the first digital signal output state is assumed
  • the first output circuit outputs the third voltage
  • the second output circuit outputs the first voltage. Therefore, it is desirable to take the second digital signal output state and to take the third digital signal output state by both the first output circuit and the second output circuit outputting the second voltage. .
  • the ⁇ modulator, the post filter, and the s driving circuits are formed on a single semiconductor or enclosed in a single package.
  • a digital speaker having a plurality of input terminals, and a digital speaker driving device that is connected to a digital input signal and a power source and drives the digital speaker, the digital speaker driving device is a digital speaker.
  • a digital speaker device is provided, which is arranged immediately after the coil group.
  • a ⁇ modulator that modulates a digital input signal and outputs an n-bit digital signal, and an m-bit digital signal that is connected to the ⁇ modulator and is mismatch-shaped from the n-bit digital signal.
  • a digital speaker device characterized in that each has r diaphragms driven by a part of s drive elements, and s and r are both 2 or more.
  • the digital speaker in a digital speaker device including a ⁇ modulator and a digital speaker, includes a plurality of coils that are driven by different digital signals and vibrate a common diaphragm.
  • a featured digital speaker device is disclosed.
  • ⁇ It is desirable that a plurality of coils are wound in a twisted manner.
  • a digital actuator in one embodiment, includes a magnetostrictive element and a plurality of coils that are driven by different digital signals and apply a magnetic field to the magnetostrictive element.
  • a ⁇ modulator that modulates a digital input signal and outputs an n-bit digital signal, and an m-bit digital signal that is connected to the ⁇ modulator and is mismatch-shaped from the n-bit digital signal.
  • a post-filter to output, s drive circuits each receiving part of an m-bit digital signal and outputting a digital signal, and s electrostatics each driven by a corresponding s drive circuit There is disclosed a digital speaker device comprising a mold element.
  • the ⁇ modulator, the post filter, s drive circuits, and s electrostatic elements are formed on the same substrate.
  • a digital speaker driving apparatus that drives a digital speaker having s number of digital signal terminals, a ⁇ modulator that modulates a digital input signal and outputs an n-bit digital signal, and a ⁇ modulator A post filter that outputs an m-bit digital signal obtained by mismatch shaping an n-bit digital signal, and a digital delay control that outputs a delayed m-bit digital signal by delay-controlling the m-bit digital signal A circuit and s number of drive circuits that receive a part of each delayed m-bit digital signal and output a digital signal, and the delay time of the digital delay control circuit depends on the control signal for each output.
  • a digital speaker driving device is disclosed that is controlled.
  • a flat display In one embodiment of the present invention, a flat display, a plurality of digital speakers arranged side by side on at least one side of the flat display, and a delay time of a drive signal supplied to the plurality of digital speakers according to a control signal And a delay control circuit for controlling the flat display device.
  • a battery comprising a port connected to a portable digital sound source reproducing device, a circuit for processing a digital signal input from the port as it is, and a digital speaker driven by this circuit, a battery
  • a digital speaker device is disclosed that is driven by
  • a portable electronic device comprising a digital speaker and a driving device that drives the digital speaker without converting the digital signal into an analog signal and is driven by a battery is disclosed. Is done.
  • the present invention is composed of a port connected to a portable digital sound source playback device, a drive device that processes a digital signal input from the port as it is, and a digital speaker driven by this drive device.
  • a portable electronic device that is driven by a battery is disclosed.
  • a digital speaker In one embodiment of the present invention, a digital speaker, a digital speaker driving device that drives the digital speaker without converting the digital signal into an analog signal, and a microphone are configured.
  • the digital speaker driving device is a signal from the microphone.
  • a digital speaker device is disclosed that is controlled to cancel ambient noise based on the above.
  • a wireless receiver that receives a digital signal
  • a digital speaker driving device that generates a plurality of driving signals without converting the output of the wireless receiver into an analog signal
  • a plurality of driving signals A portable electronic device comprising a digital speaker to be driven is disclosed.
  • a digital speaker system for driving a digital speaker having s sets of digital signal terminals each including a set of a first input terminal and a second input terminal, wherein the digital input signal is modulated.
  • a ⁇ modulator that outputs an n-bit digital signal
  • a post-filter that is connected to the ⁇ modulator and outputs an m-bit digital signal that is subjected to a match-shaping of the output n-bit digital signal
  • s sets Corresponding to the digital signal terminal, and having s drive circuits each of which is inputted with a part of the output m-bit digital signal and outputs the digital signal, and each of the s drive circuits corresponds to each A first output circuit connected to the first input terminal of the digital signal terminal to be connected, and a second input terminal paired with the first input terminal.
  • a second output circuit, and the drive circuit is a combination of the first digital signal input to the first output circuit and the second digital signal input to the second output circuit.
  • the digital speaker driving apparatus drives a plurality of digital speakers each having s digital signal terminals, and modulates a digital input signal and outputs an n-bit digital signal.
  • a delta-sigma modulator, a post filter connected to the delta-sigma modulator and outputting an m-bit digital signal obtained by mismatch-shaping an n-bit digital signal, and the output m-bit digital signal is delayed by delay control.
  • a digital delay control circuit that outputs an m-bit digital signal, s drive circuits that each receive a part of the delayed m-bit digital signal and output a digital signal, and a person or an object that is present in the vicinity
  • a control having a sensor for sensing information and generated based on the information sensed by the sensor
  • the delay time of the digital delay control circuit is controlled according to the signal, and the directivity of the sound reproduced by a plurality of digital speakers is controlled to the direction or position of the person or object detected by the sensor.
  • a digital speaker driving apparatus is disclosed.
  • a digital speaker driving apparatus for driving a digital speaker having s digital signal terminals, a ⁇ modulator that modulates a digital input signal and outputs an n-bit digital signal;
  • a post filter connected to the ⁇ modulator and outputting an m-bit digital signal obtained by mismatch-shaping an n-bit digital signal, and an m-bit delayed by controlling the delay of the output m-bit digital signal.
  • a digital delay control circuit for outputting a digital signal, s drive circuits for inputting a part of the delayed m-bit digital signal and outputting a digital signal, and a microphone for detecting ambient sound, Audio that is out of phase with the sound detected by the microphone is generated by the digital speaker.
  • Digital speaker driving apparatus is disclosed, wherein.
  • another digital speaker since another digital speaker is provided, it has a plurality of digital speakers, and the digital delay control circuit controls the delay time of the output m-bit digital signal system for each digital speaker. Then, an m-bit digital signal delayed may be output.
  • FIG. 1d shows one embodiment of the digital acoustic system of the present invention using a digital signal source and a digital speaker device.
  • the signal from the digital signal source is input to the digital speaker device as a digital signal.
  • the digital speaker device is a digital speaker device that directly converts an input digital signal into analog sound without converting it into an analog signal.
  • a digital sound system can be constructed with a simple combination of devices compared to a conventional analog sound system without impairing the low power consumption characteristic, which is the original characteristic of a digital speaker.
  • the cost of the system can be reduced. Since the digital speaker device can produce a large sound pressure with a low driving voltage, it is not necessary to use a special semiconductor technology for handling high voltages when the digital signal processing circuit is integrally formed on a semiconductor. The cost of the necessary digital speaker driving device can be reduced. Since driving is performed with a low driving voltage, electromagnetic radiation (EMI) is small, and the cost for suppressing electromagnetic radiation can be reduced. Since there is no A / D (D / A) converter between the digital signal source and the digital speaker device, it is possible to avoid deterioration of sound quality.
  • EMI electromagnetic radiation
  • Example of configuration of digital sound system Example of configuration of digital sound system
  • Example of configuration of digital sound system Example of configuration of digital sound system
  • Example of configuration of digital sound system 1 is a configuration diagram of a digital sound system according to an embodiment of the present invention.
  • 1 is a configuration diagram of a digital sound system according to an embodiment of the present invention.
  • 1 is a configuration diagram of a power supply circuit of a digital acoustic system according to a first embodiment of the present invention.
  • the block diagram of the power supply circuit of the digital acoustic system which concerns on 2nd Example of this invention
  • the block diagram of the power supply circuit of the digital sound system which concerns on 3rd Example of this invention
  • the block diagram of the speaker drive circuit of the digital sound system which concerns on one Example of this invention
  • the block diagram of the speaker drive circuit of the digital sound system which concerns on another Example of this invention.
  • the block diagram of the digital sound system which concerns on 4th Example of this invention The block diagram of the digital sound system which concerns on 4th Example of this invention
  • the block diagram of the digital sound system which concerns on 5th Example of this invention The block diagram of the digital acoustic system which concerns on the 6th Example of this invention
  • the block diagram of the digital acoustic system which concerns on the 7th Example of this invention The block diagram of the digital sound system which concerns on the 8th Example of this invention.
  • the block diagram of the digital sound system which concerns on the 8th Example of this invention The block diagram of the digital sound system which concerns on the 8th Example of this invention.
  • the block diagram of the digital sound system which concerns on the 8th Example of this invention The block diagram of the digital sound system which concerns on the 8th Example of this invention.
  • the block diagram of the digital acoustic system which concerns on the 9th Example of this invention The block diagram of the digital acoustic system which concerns on the 9th Example of this invention
  • the block diagram of the digital sound system which concerns on the 10th Example of this invention The block diagram of the digital acoustic system based on the 11th Example of this invention
  • the block diagram of the digital acoustic system based on the 12th Example of this invention The block diagram of the digital acoustic system based on the 13th Example of this invention
  • the block diagram of the digital acoustic system based on the 14th Example of this invention Configuration diagram of a digital sound system according to a fifteenth embodiment of the present invention.
  • Configuration diagram of a digital sound system according to a fifteenth embodiment of the present invention.
  • the block diagram of the digital acoustic system based on the 16th Example of this invention The block diagram of the digital acoustic system based on the 17th Example of this invention
  • the block diagram of the speaker drive circuit which consists of a ternary switching amplifier based on one Embodiment of this invention
  • the block diagram of the digital acoustic system based on the 19th Example of this invention The block diagram of the digital acoustic system based on the 20th Example of this invention.
  • Configuration diagram of a digital sound system according to a twenty-first embodiment of the present invention. 1 is a configuration diagram of a centralized control device (2105) according to an embodiment of the present invention and an in-vehicle LAN that transmits digital signals.
  • FIG. 1e shows a first embodiment of a system form of a digital speaker device comprising a circuit for outputting a plurality of digital signals by a ⁇ modulator and a post filter circuit and a plurality of speaker driving elements.
  • the 1-bit digital input signal (210) is input to the ⁇ modulator (201) and converted into a plurality of n-bit digital signals (211) by the ⁇ modulator (201).
  • the n-bit digital signals are converted into m digital signals (212) that have been mismatch-shaped by the post filter (202).
  • the m digital signals are directly converted by the diaphragm (213) by driving the s drive elements (2041 to 204s) by the speaker drive circuits (2031 to 203s).
  • the ⁇ modulator (201), post filter (202), speaker drive circuits (2031 to 203s), and a power supply circuit (205) for supplying power to these circuits are components of the digital speaker device (200).
  • each of the digital signals input to the s speaker driving circuits (2031 to 203s) may show the same value at a certain moment. However, it is possible to prevent changes in digital signals input to the s speaker driving circuits (2031 to 203s) during a sufficiently long time from being the same. In this way, wasteful power consumption by the drive elements (2041 to 204s) can be suppressed. For example, when the same digital signal is input to n of s speaker drive circuits (2031 to 203s), n times as much power as wasted by each drive element is wasted. Is prevented. This can also be said for other embodiments.
  • FIG. 2a shows the internal configuration of the power supply circuit (205) in the first embodiment.
  • An external power source or a power source (251) from a battery or the like has a plurality of regulator circuits (2521 to 252n), which are respectively supplied to a ⁇ modulator (201), a post filter (202), and a speaker driving circuit (2031 to 203s). Supplied via lines (2531 to 253n).
  • the regulator circuit (252a) for supplying power to the speaker drive circuits (2031 to 203s) can have means (254) for varying the supply voltage. This makes it possible to adjust the amplitude of the digital signal that drives the digital speaker, and to adjust the volume of the digital speaker.
  • FIG. 2b shows a second embodiment of a system form of a digital speaker device comprising a circuit for outputting a plurality of digital signals by a ⁇ modulator and a post filter circuit and a plurality of speaker driving elements.
  • the regulator circuit (252a) for supplying power to the speaker drive circuits (2031 to 203s) does not have means (254) for changing the supply voltage.
  • Digital adjustment is performed from a 1-bit digital input signal (210) input to the digital speaker device.
  • FIG. 2c shows a third embodiment of a system form of a digital speaker device comprising a circuit for outputting a plurality of digital signals by a ⁇ modulator and a post filter circuit and a plurality of speaker driving elements.
  • the digital speaker device in order to adjust the volume of the digital speaker, is provided with means (254) for varying the supply voltage of the regulator circuit (252a) that supplies power to the speaker drive circuits (2031 to 203s). Digital adjustment is performed based on information of the input 1-bit digital input signal (210).
  • FIG. 3a shows an embodiment of a speaker driving circuit (300a) having a binary driving state.
  • Two types of switch circuits composed of a PMOS element (301) and an NMOS element (302) are connected to the speaker drive element (204) via output terminals, respectively.
  • An input signal A which is a binary digital signal, is connected to the input of one switch circuit via an inverting circuit (303).
  • the speaker drive circuit (300a) has a binary (-1, 1) state.
  • FIG. 3b shows an embodiment of a speaker driving circuit (300b) having a ternary driving state. Two types of switch circuits composed of a PMOS element (301) and an NMOS element (302) are connected to the speaker drive element (204) via output terminals, respectively.
  • An input signal A which is a binary digital signal is connected to the input of each switch circuit via a buffer circuit (304b) with an enable terminal and an inverting circuit (303a).
  • the speaker driving circuit (300b) has a ternary state (-1, 0, 1).
  • Such a circuit is generally called an H-bridge circuit.
  • the digital speaker device including the ⁇ modulator, the post filter circuit, the plurality of speaker driving circuits, and the driving elements as shown in FIGS. 2a to 2c
  • a plurality of transmission signals after the ⁇ modulator are required. Therefore, in order to reduce the number of necessary wirings, it is desirable that the ⁇ modulator, the post filter circuit, and the plurality of speaker drive circuits are integrally configured.
  • a digital signal processing circuit consisting of a delta-sigma modulator, a post-filter circuit, a plurality of speaker drive circuits, and drive elements is formed on a semiconductor as a single unit or enclosed in the same package. It is possible to reduce the number of lines.
  • FIG. 4a (back view) and FIG. 4b (side view) show a fourth embodiment of a digital speaker device comprising a ⁇ modulator, a post filter circuit, a plurality of speaker drive circuits and drive elements.
  • a system of a digital speaker device (400) comprising a digital speaker driving device (402) and a plurality of speaker driving elements, in which a circuit for outputting a plurality of digital signals by a prefilter circuit is integrally formed on a semiconductor, or enclosed in the same package Shown as an embodiment.
  • a 1-bit digital input signal (403) is input to a digital speaker driving device (402) including a ⁇ modulator, a post-filter circuit, and a plurality of digital signals in a driving circuit, and the plurality of digital speaker driving signals (401) are input. Is output.
  • the power supply line (404) supplies power to the digital speaker drive circuit (402).
  • the digital speaker driving circuit (402) is arranged in the vicinity of the speaker driving element so that the distance between the plurality of digital speaker driving signals (401) and the speaker driving element is shortened. As shown in FIGS. 4a and 4b, it is possible to minimize the wiring distance by arranging the speaker directly behind the speaker.
  • the digital input signal input to the digital speaker device is never converted into an analog signal in the digital speaker device. Since the plurality of digital signals drive the plurality of speaker driving elements, the digital signals can be directly converted into analog sound. Since it is not converted into an analog signal on the way, an A / D conversion circuit required for analog conversion becomes unnecessary, power consumption and a required semiconductor area can be reduced, and a low-cost digital speaker device can be provided. . Since the digital speaker device can produce a large sound pressure with a low driving voltage, it is not necessary to use a special semiconductor technology for handling high voltages when the digital signal processing circuit is integrally formed on a semiconductor. An integrated digital speaker driving device necessary for the digital speaker device can be provided by using the technology.
  • FIG. 5 shows a fifth embodiment of a system form of a digital speaker device comprising a circuit for outputting a plurality of digital signals by a ⁇ modulator and a post filter circuit and a plurality of speaker driving elements.
  • the 1-bit digital input signal (510) is input to the ⁇ modulator (501), and is converted into a plurality of n-bit digital signals (511) by the ⁇ modulator (501).
  • the plurality of n-bit digital signals are converted into m digital signals (512) that have been mismatch-shaped by the post filter (502).
  • the m digital signals are directly converted by the diaphragm (513) by driving the s drive elements (5041 to 504s) by the speaker drive circuits (5031 to 503s).
  • the ⁇ modulator (501), post filter (502), speaker drive circuits (5031 to 503s), and a power supply circuit (505) for supplying power to these circuits are components of the digital speaker device (500).
  • a plurality of (two) speaker diaphragms (513a, 513b) are driven by a combination of s drive elements. If a circuit that outputs a plurality of digital signals by a delta-sigma modulator and a post filter circuit drives a plurality of speaker elements to directly convert analog sound, the number of drive elements (s) and speaker vibration Any combination between the number of films (r) is possible. In general, r ⁇ 1 and s> 1 are sufficient.
  • FIG. 6 shows a sixth embodiment of a system form of a digital speaker device comprising a circuit for outputting a plurality of digital signals by a ⁇ modulator and a post filter circuit and a plurality of speaker driving elements.
  • the 1-bit digital input signal (610) is input to the ⁇ modulator (601), and is converted into a plurality of n-bit digital signals (611) by the ⁇ modulator (601).
  • the plurality of n-bit digital signals are converted into m digital signals (612) that have been mismatch-shaped by the post filter (602).
  • the m digital signals are directly converted by the vibrating membrane (613) by driving the s drive elements (6041 to 604s) by the speaker drive circuits (6031 to 603s).
  • the ⁇ modulator (601), the post filter (602), the speaker drive circuits (6031 to 603s), and the power supply circuit (605) for supplying power to these circuits are components of the digital speaker device (600).
  • a plurality of coils are bundled and wound in order to drive the vibration membrane (613) of the speaker by combining a plurality of s drive elements.
  • the plurality of coil wires may be twisted (604a) or wound side by side (604b). Further, only some of the coils may be made independent.
  • the plurality of driving elements necessary for the digital speaker device can be arbitrarily arranged.
  • FIG. 7 shows a seventh embodiment of a system form of a digital speaker device comprising a circuit for outputting a plurality of digital signals by a ⁇ modulator and a post filter circuit and a plurality of speaker driving elements.
  • the 1-bit digital input signal (710) is input to the ⁇ modulator (701), and is converted into a plurality of n-bit digital signals (711) by the ⁇ modulator (701).
  • the plurality of n-bit digital signals are converted into m digital signals (712) that have been mismatch-shaped by the post filter (702).
  • the m digital signals are supplied to a drive circuit (7031-7 03 s) to drive s drive coils (7041 to 704 s) to apply a magnetic field to the magnetostrictive element (713).
  • An audio signal is directly converted by a drive unit (714) mechanically connected to the magnetostrictive element (713).
  • the ⁇ modulator (701), the post filter (702), the drive circuits (7031 to 603s), and the power supply circuit (705) for supplying power to these circuits are components of the digital speaker device (700).
  • a plurality of coils are wound to drive a drive unit (714) mechanically connected to the magnetostrictive element (713) by combining a plurality of s drive elements.
  • the magnetostrictive element (713) has an element size that changes at a speed of nsec to ⁇ sec according to an external magnetic field such as a coil or a magnet. If a magnetostrictive element (713) is used in place of a normal voice coil, a digital speaker device (700) for bone conduction can be realized.
  • an analog value is controlled by using a magnetostrictive element, an injection valve, a pump, a positioner, an actuator such as a linear actuator, a torque sensor, etc. It can also be applied to digital control of sensors.
  • FIGS. 8a to 8c show an eighth embodiment of a system form of a digital speaker device comprising a circuit for outputting a plurality of digital signals by a ⁇ modulator and a post filter circuit and a plurality of electrostatic speaker driving elements.
  • the 1-bit digital input signal (810) is input to the ⁇ modulator (801) and converted into a plurality of n-bit digital signals (811) by the ⁇ modulator (801).
  • the plurality of n-bit digital signals are converted into m digital signals (812) subjected to mismatch shaping by a post filter (802).
  • the m digital signals are obtained as audio signals by driving the s electrostatic elements (8041 to 804s) by the drive circuit (8031 to 803s).
  • the ⁇ modulator (801), the post filter (802), the drive circuits (8031 to 803s), and a power supply circuit (805) for supplying power to these circuits are components of the digital speaker device (800).
  • a ⁇ modulator (801), a post filter (802), a drive circuit (8031 to 8034), and four electrostatic elements (8041 to 8044) are integrally formed on the same substrate (820).
  • Such an integrated digital speaker device (820) can be realized, for example, by making a digital circuit and an electrostatic speaker element on the same silicon substrate by using silicon process technology. Incorporation into the used headphone device (830) is easy.
  • FIG. 9a shows a ninth embodiment of a system configuration of a digital speaker device comprising a circuit for outputting a plurality of digital signals by a ⁇ modulator and a post filter circuit, a plurality of speaker driving elements and a plurality of speakers.
  • the 1-bit digital input signal (910) is input to the ⁇ modulator (901), and converted into a plurality of n-bit digital signals (911) by the ⁇ modulator (901).
  • the plurality of n-bit digital signals are converted into m digital signals (912) that have been mismatch-shaped by the post filter (902).
  • the m digital signals are individually controlled in delay by a digital delay control circuit (905) controlled by the digital signal (920), and then s speakers (9041 to 904s) by a drive circuit (9031 to 903s). To obtain an audio signal.
  • the ⁇ modulator (901), the post filter (902), the drive circuit (9031 to 903s), the digital delay control circuit (905), and the power supply circuit (906) for supplying power to these circuits are connected to the digital speaker device (900). ).
  • the ⁇ modulator (901), the post filter (902), the drive circuit (9031 to 903s), the digital delay control circuit (905), and a power supply circuit (906) for supplying power to these circuits are provided.
  • the delay time of the digital signal to the plurality of speakers of the digital speaker device (900) is controlled by the signal from the home game machine (940), the sound is distributed up and down, left and right according to the content of the game. By doing so, it becomes possible to increase the presence of the game.
  • the center of the screen is set according to the contents of the program being viewed. It is possible to give the directivity of the reproduced sound so as to concentrate on the part, or to make the reproduced sound omnidirectional so that it can be heard anywhere in the room.
  • a digital signal source signal is applied to a digital speaker device including a circuit that outputs a plurality of digital signals by a ⁇ modulator and a post-filter circuit, a plurality of speaker driving elements, and a plurality of speakers as in the first to ninth embodiments.
  • a digital speaker device including a circuit that outputs a plurality of digital signals by a ⁇ modulator and a post-filter circuit, a plurality of speaker driving elements, and a plurality of speakers as in the first to ninth embodiments.
  • FIG. 10 shows a digital speaker device (1002) composed of a circuit for outputting a plurality of digital signals by a ⁇ modulator and a post filter circuit, a plurality of speaker driving elements and a plurality of speakers, and a portable digital as a digital signal source (1003).
  • a battery (1004) is used as a power source for supplying power to the digital speaker device. However, it is also possible to supply power from another power source.
  • a mobile phone as a digital signal source (1103) is added to a digital speaker device (1102) comprising a circuit for outputting a plurality of digital signals by a ⁇ modulator and a post filter circuit, a plurality of speaker driving elements and a plurality of speakers.
  • a digital sound system using a digital speaker device that connects (1101) a digital signal from the device and directly converts the input digital signal into an analog sound without converting it into an analog signal is shown.
  • a headphone type digital speaker device is used as the digital speaker device, but any digital speaker device other than the headphone type can be used.
  • FIG. 12 shows a personal computer as a digital signal source (1203) in a digital speaker device (1202) comprising a circuit for outputting a plurality of digital signals by a ⁇ modulator and a post filter circuit, a plurality of speaker driving elements and a plurality of speakers.
  • a digital sound system using a digital speaker device that connects a digital signal from a device and directly converts the input digital signal into analog sound without converting it into an analog signal will be described.
  • a digital speaker device having a plurality of coils arranged on one vibrating membrane is used, it is also possible to use a digital speaker device having a plurality of speakers arranged.
  • FIG. 13 shows an active mute as a digital signal source (1303) in a digital speaker device (1302) including a circuit for outputting a plurality of digital signals by a ⁇ modulator and a post filter circuit, a plurality of speaker driving elements and a plurality of speakers.
  • a thirteenth embodiment of a digital sound system using a digital speaker device that connects a digital signal from a digital audio processing device for digital use and directly converts the input digital signal into analog audio without converting it into an analog signal is shown.
  • a digital sound system for active silencing with low power consumption can be constructed by calculating a signal for canceling ambient noise from the sound collecting microphone (1304) by a digital sound processing device and inputting the signal to the digital speaker device (1302). is there.
  • This embodiment can also be applied to a digital acoustic system for echo cancellation for videophones and remote conferences.
  • This embodiment can also be applied to a digital sound system for delay control of a large-scale loudspeaker such as a concert or a stadium.
  • FIG. 14 shows a mobile phone as a digital signal source (1403) in a digital speaker device (1402) composed of a circuit for outputting a plurality of digital signals by a ⁇ modulator and a post filter circuit, a plurality of speaker driving elements and a plurality of speakers.
  • a headphone type digital speaker device is used as the digital speaker device, but any digital speaker device other than the headphone type can be used.
  • a digital signal is transmitted from a digital signal source to a digital speaker device (1402) by wireless communication technology. It can be applied to any digital sound system to be connected.
  • FIG. 15a shows a fifteenth embodiment of a system form of a digital speaker device comprising a circuit for outputting a plurality of digital signals by a ⁇ modulator and a post filter circuit and a plurality of speaker driving elements.
  • the 1-bit digital input signal (1510) is input to the ⁇ modulator (1501), and is converted into a plurality of n-bit digital signals (1511) by the ⁇ modulator (1501).
  • a plurality of n-bit digital signals are converted into m digital signals (1512a) by the formatter (1502a) and converted into m digital signals (1512b) subjected to mismatch shaping by the filter (1502b).
  • the m digital signals are directly converted by the vibration membrane (1513) by driving the s drive elements (15041 to 1504s) by the speaker drive circuit (15031 to 1503s).
  • the ⁇ modulator (1501), formatter (1502a), filter (1502b), speaker driving circuit (15031 to 1503s), and a power supply circuit (1505) for supplying power to these circuits are components of the digital speaker device (1500). It is.
  • FIG. 15b shows the components of the filter circuit (1502b) used in this embodiment.
  • the m digital signals (1512a) input to the selection circuit (1505) are output from the m digital signals of the selection circuit (1506a) configured by a delay element and an adder.
  • the integration circuit (1506b) calculates the frequency of use of the m digital signals of the selection circuit and selects them in ascending order of usage frequency.
  • FIG. 16 shows a sixteenth embodiment of a system configuration of a digital speaker device comprising a circuit for outputting a plurality of digital signals by a ⁇ modulator and a post filter circuit and a plurality of speaker driving elements.
  • the components of the filter circuit (1602b) used in this embodiment are shown.
  • the m number of digital signals (1612a) input to the selection circuit (1605) is an n-stage integration circuit composed of a delay element and an adder that outputs the m number of digital signals of the selection circuit.
  • (16061 to 1606n) calculates the frequency of use of the m digital signals of the selection circuit, and works so as to select them in ascending order of usage frequency.
  • the filter circuit can be composed of an integration circuit having an arbitrary number of stages of one or more.
  • FIG. 17A shows a seventeenth embodiment of a system form of a digital speaker apparatus comprising a circuit for outputting a plurality of digital signals by a ⁇ modulator and a post-filter circuit and a plurality of speaker driving elements comprising a ternary switching amplifier.
  • the 1-bit digital input signal (1710) is input to the ⁇ modulator (1701).
  • the ⁇ modulator (1701) converts the digital input signal into a plurality of n-bit digital signals (1711).
  • a plurality of n-bit digital signals are converted into m digital signals (1712a) by a formatter (1702a).
  • the m digital signals (1712a) are input to the filter (1702b), mismatch shaped, and converted into m digital signals (1712b).
  • the speaker driving circuits (17031 to 1703s) directly drive the s driving elements (17041 to 1704s) to which a part of m digital signals are input, and directly generate analog sound by the vibrating membrane (1713). .
  • the driving elements (17041 to 1704s) are composed of s ternary switching amplifiers.
  • the ⁇ modulator (1701), formatter (1702a), filter (1702b), speaker driving circuit (17031 to 1703s) composed of a ternary switching amplifier, and a power supply circuit (1705) for supplying power to these circuits are digital speakers. It is a component of the device (1700).
  • a digital speaker device is configured with a speaker drive circuit composed of eight ternary switching amplifiers.
  • FIG. 17b shows an embodiment of a speaker drive circuit composed of a ternary switching amplifier.
  • a circuit of the speaker drive circuit 1703s is shown as an example of the reference numerals 17031 to 1703s.
  • the speaker drive circuit 1703 s includes first and second source transistors 301 and first and second sink transistors.
  • the first source transistor and the first sink transistor are connected in series, and the input signal A is input to each gate.
  • the second source transistor and the second sink transistor are connected in series, and the input signal / A is input to each gate.
  • a connection point between the first source transistor and the first sink transistor and a connection point between the second source transistor and the second sink transistor are connected to digital signal terminals forming a pair of digital speakers, respectively.
  • Such a circuit is generally called an H-bridge circuit in the field of motor control.
  • the speaker drive circuit (1703s) has a ternary state (-1, 0, 1) according to the states of the input signals / A and A.
  • / A represents inversion of A, but in this embodiment, / A and A may be the same value.
  • the speaker driving circuit (1700b) can be configured to be driven so as to increase the state of 0, so that unnecessary switching operation can be avoided and low power consumption digital A speaker device can be realized. At the same time, there is an effect of reducing noise and electromagnetic radiation caused by the switching operation.
  • FIG. 18 shows an eighteenth embodiment of the system form of the digital speaker apparatus comprising a circuit for outputting a plurality of digital signals by a ⁇ modulator and a post filter circuit and a plurality of speaker driving elements comprising a ternary switching amplifier.
  • the 1-bit digital input signal (1810) is input to the ⁇ modulator (1801), and converted into a plurality of n-bit digital signals (1811) by the ⁇ modulator (1801).
  • the plurality of n-bit digital signals are converted into m digital signals (1812a) by the formatter (1802a).
  • the m-child digital signal (1812a) is input to the filter (1802b), mismatch shaped, and converted into m digital signals (1812b).
  • the speaker drive circuits (18031 to 1803s) drive s drive elements (18041 to 1804s), each of which receives a part of m digital signals, and directly generate analog sound by the diaphragm (1813).
  • the driving elements (18041 to 1804s) are composed of s ternary switching amplifiers.
  • the 1-bit digital input signal (1810) is also input to the peak detector (1806), and a control signal (1816) corresponding to the amplitude value of the digital input signal is output.
  • the peak sensor (1806) calculates the amplitude value of the voice represented by the digital input signal, and the control signal (1816) is output according to the result of this calculation. For example, the amplitude value is calculated as a loudness level between predetermined lengths.
  • the control signal (1816) is input to the formatter (1802a).
  • the formatter (1802a) performs control to change the number of bits of the digital signal (1812a) input to the filter (1802b) to a maximum of m bits according to the amplitude value.
  • a digital signal (1812a) having 0 bits or a small number of bits close to 0 is output by the formatter. If the amplitude value is large, a digital signal (1812a) having a large number of bits close to m is output. ) Is output by the formatter. For example, the number of bits of the digital signal (1812a) is calculated by excluding signals having the same value for a predetermined time.
  • a speaker drive circuit (18031 to 1803s), a peak detector (1806), and a power supply for supplying power to these circuits, the ⁇ modulator (1801), formatter (1802a), filter (1802b), ternary switching amplifier A circuit (1805) is a component of the digital speaker device (1800).
  • a digital speaker device constituted by a plurality of speaker driving elements comprising a circuit for outputting a plurality of digital signals by a ⁇ modulator and a post filter circuit and a ternary switching amplifier.
  • a system has been described in which the number of bits of a digital signal input to the filter is dynamically controlled according to the amplitude of the input digital signal by adding a peak sensor to the filter.
  • the amplitude of the input digital signal is small, the number of units that operate when performing mismatch shaping with a filter is reduced, so that the range of unit characteristic variation is reduced.
  • noise can be effectively suppressed, and a digital speaker device capable of high-quality sound reproduction can be realized.
  • FIG. 19 shows a nineteenth embodiment of the system form of a digital speaker apparatus comprising a circuit for outputting a plurality of digital signals by a ⁇ modulator and a post-filter circuit and a plurality of speaker driving elements comprising a ternary switching amplifier.
  • 1-bit digital input signal (19 10) is converted into a p-bit digital audio signal (1911a) by the serial / parallel converter (1901a) which is input to the serial / parallel converter (1901a).
  • a 1-bit digital input signal (1910) is obtained by reproducing audio data recorded on a compact disc (CD), it is preferably converted into a 16-bit digital audio signal.
  • CD compact disc
  • the p-bit digital audio signal (1911a) is input to the interpolation filter (1901b) to remove unnecessary high-frequency aliasing frequency components when it is oversampled by the ⁇ modulator (1901c).
  • a signal (1911b) is output.
  • the q bit digital audio signal (1911b) is oversampled by the ⁇ modulator (1901c) and converted into a plurality of n bit digital signals (1911c) by the ⁇ modulator (1901).
  • the relationship of n ⁇ p, q and n> 2 is established.
  • a plurality of n-bit digital signals are converted into m digital signals (1912a) by a formatter (1902a).
  • the m digital signals (1912a) are input to the filter (1902b) and converted to m digital signals (1912b) subjected to mismatch shaping.
  • the speaker drive circuits (19031 to 1903s) drive s drive elements (19041 to 1904s), each of which receives part of m digital signals, and directly convert analog sound by the diaphragm (1913). .
  • the drive elements (19041 to 1904s) are composed of s ternary switching amplifiers.
  • the ⁇ modulator (1901c), formatter (1902a), filter (1902b), speaker drive circuit (19031 to 1903s) composed of a ternary switching amplifier, and a power supply circuit (1905) for supplying power to these circuits are digital speakers. It is a component of the device (1900).
  • an input 1-bit digital signal is converted into a serial / parallel converter (1901a).
  • a serial / parallel converter (1901a) To p bit digital audio signal (1911a).
  • an interpolation filter (1901b) may be inserted to remove unnecessary high-frequency aliasing frequency components when oversampling. These components are not essential as the components of the present application.
  • a 1-bit digital signal is input to the ⁇ modulator.
  • a digital audio signal having an arbitrary number of bits can be expressed by a 1-bit digital signal. For example, in the case of a CD, it is 16 bits, and in the Digital Versatile Disc (DVD) standard, standards such as 24 bits are defined in addition to 16 bits.
  • DVD Digital Versatile Disc
  • a digital signal representing a digital audio signal having an arbitrary number of bits can be input to the ⁇ modulator as a constituent element of the present application.
  • the number of bits of the digital signal output from the ⁇ modulator is smaller than the number of bits of the digital audio signal input to the ⁇ modulator.
  • the audio signal can be decoded by a smaller number of speaker driving circuits than the amplitude gradation of the audio expressed by the number of bits of the digital audio signal.
  • the audio signal can be decoded by directly driving the number of speaker driving circuits smaller than the amplitude gradation of the audio with the digital audio signal, the cost required for the digital audio demodulation is reduced. It can be greatly reduced. Simultaneous application of acoustic effects such as directivity is facilitated by using a plurality of speaker drive circuits.
  • FIG. 20 shows a combination of a circuit for outputting a plurality of digital signals by a ⁇ modulator and a post filter circuit, a digital speaker device (2001) composed of a plurality of speaker driving elements and a plurality of speakers, and a digital advertisement display device (2002).
  • a digital sound system using a digital speaker device in which a signal from the device (2003) is connected to a control device (2004) for controlling the directivity of the digital speaker device (2001) will be described.
  • a plurality of speakers are used as in the ninth to fourteenth embodiments, and the delay of a signal for driving each speaker is controlled by a digital delay circuit as in the ninth embodiment. Thereby, the directivity of the reproduced sound is changed toward the direction or position where the person or the object detected by the sensor device exists.
  • Sensor device (2003) senses some surrounding information.
  • the sensor device (2003) is an imaging device, and takes an image around the sensor device (2003). By analyzing the captured image, it is detected whether a person or an object exists around the sensor device (2003).
  • the direction and position where a person or an object exists can also be calculated. In this case, the direction and position can be calculated more accurately by using information sensed by the plurality of sensor devices (2003).
  • the sensor device (2003) may be an infrared sensor. In this case, infrared rays or the like generated by the body temperature of a person or animal are detected, and the presence, direction, or position of the person or animal is calculated based on the detection result.
  • ultrasonic waves reflected from a person or an object may be detected by generating ultrasonic waves from a digital speaker device (2001) or the like.
  • a switch or the like is provided on the road surface or the floor surface, and the position of a person or animal can be detected by ON / OFF of the switch or the like.
  • the result of detection by the sensor device (2003) is analyzed by a control device (2004) such as a microcomputer and used to control the digital speaker device (2001) and / or the digital advertisement display device (2002).
  • a control device (2004) such as a microcomputer and used to control the digital speaker device (2001) and / or the digital advertisement display device (2002).
  • the phase shift of the signal to each driving device is controlled by digitally delaying the signals from the ⁇ modulator and the formatter using a delay circuit according to the calculated direction and position.
  • the directivity of the acoustic signal radiated in the space can be changed.
  • the speaker device 2001
  • the distance between the speakers is d
  • the phase of SP2 with respect to SP3 is (2 ⁇ d
  • the directivity of the sound reproduced by the digital speaker can be dynamically controlled. That is, when an object for transmitting a voice such as a person exists within a predetermined range, control is performed so that the voice is emitted toward the position of the presence.
  • control is performed so that the voice is emitted toward the position of the presence.
  • the digital advertisement display device of the present application in addition to being able to effectively convey necessary audio information only to an object interested in the advertising medium, it is not necessary to reproduce the audio information at an unnecessarily high volume Therefore, it can cope with noise problems.
  • this embodiment provides display explanation devices for museums, science museums, on-site advertising devices for stations, airports, hotels, etc., advertising devices for public institutions such as buses, trains, cars, etc., hospitals, government offices It can also be applied to premises guidance devices in public institutions such as.
  • FIG. 21a shows a digital speaker device (21 including a circuit for outputting a plurality of digital signals by a ⁇ modulator and a post filter circuit, a plurality of speaker driving elements, and a plurality of speakers. 03) and a display device (2102), and a twenty-first embodiment of an in-vehicle digital acoustic system using a digital speaker device capable of controlling the directivity of the digital speaker device (2103) will be described.
  • in-vehicle use as in the present embodiment particularly when the display device is used as a rear projector, mainly as an entertainment device (DVD or TV viewing device) for passengers sitting in the rear seat, to ensure safety. Therefore, it is necessary for the driver to make the volume as low as possible depending on the situation. Since the directivity of the sound reproduced by the digital speaker of the present application can be dynamically controlled, it can be widely applied to such in-vehicle use.
  • the above-mentioned situation is judged based on detection of vibration or acceleration applied to the vehicle body by a vibration sensor or an acceleration sensor. For example, it is determined whether there is a change that continuously exceeds the magnitude of acceleration due to a continuous sharp curve.
  • the sound outside the vehicle is detected by a microphone, and the presence or absence of the sound of an emergency car siren or a crossing alarm is determined. If it is determined that a sharp curve continues or if sirens are detected, the driver is controlled so that the voice of the entertainment device is as low as possible in order to concentrate the driver on driving. .
  • it uses the GPS (Global Positioning System) to detect the current position, determine whether or not you are traveling in a dangerous place such as a mountain road, and entertain the driver to focus on driving Control is performed so that the sound of the apparatus becomes as small as possible.
  • GPS Global Positioning System
  • an external monitor camera (2104) is arranged, and as shown in FIG. 21b, the central control device (2105) and Connect using the in-vehicle LAN (2106) that transmits (light) digital signals.
  • Information detected by the vehicle monitor camera (2104) or the like is analyzed by the central control device (2105), and the digital speaker is controlled based on the result of the analysis.
  • the digital speaker of the present application can control not only the volume but also acoustic characteristics such as directivity by a digital signal. Also, since digital signals are used, such in-vehicle LAN (2 106) can be easily connected. Therefore, by connecting the digital speaker of the present application to the in-vehicle LAN (2106), it is possible to provide a comfortable and safe vehicle for the driver and passengers.
  • This embodiment is not limited to entertainment, and the digital speaker of the present application can also be used as an active noise canceling device for reducing road noise and the like.
  • road noise or the like is detected by a microphone (not shown), and sound having the opposite phase is generated.
  • by controlling the directivity at that time it is possible to reduce, for example, only road noise heard by the driver or only road noise heard by passengers in the passenger seat and the rear seat.
  • This embodiment can be applied to vehicles such as airplanes, motorbikes, buses, and trains in addition to the onboard digital sound system. It can also be applied to digital sound systems and noise cancellation applications in capsule hotels and other beds, audio-visual rooms, concert halls, and the like.
  • a digital speaker driving apparatus that drives a digital speaker having s number of digital signal terminals, a ⁇ modulator that modulates a digital input signal and outputs an n-bit digital signal; A post filter connected to the ⁇ modulator and outputs an m-bit digital signal obtained by mismatch-shaping an n-bit digital signal, and s number of digital signals that are respectively inputted with a part of the m-bit digital signal.
  • a driving circuit; and a power supply circuit that supplies power to the ⁇ modulator, the post filter, and the s driving elements, and the s driving circuits correspond to the s digital signal terminals.
  • a first digital speaker driving device is provided.
  • the power supply circuit adjusts the amplitude of the output of the digital signal of the s drive circuits by supplying a variable voltage to the s drive elements.
  • a second digital speaker driver is provided.
  • the first digital speaker driving device further includes a digital attenuator that adjusts the volume of the digital speaker by performing predetermined arithmetic processing on the digital input signal and inputting the digital input signal to the ⁇ modulator.
  • a third digital speaker driving apparatus is provided.
  • a fourth digital speaker driving device characterized in that the power supply circuit is controlled in response to the digital input signal.
  • the digital speaker driving device connected to the digital signal terminal of the digital speaker, the first output circuit connected to the first input terminal of the digital signal terminal of the digital speaker, and the digital signal terminal of the digital speaker, A second output circuit connected to a second input terminal paired with the first input terminal, and an inverted signal is supplied to the first output circuit and the second output circuit.
  • a fifth digital speaker driving device is provided.
  • the first output circuit and the second output circuit both output signals composed of first, second and third voltages, and the first output circuit. Outputs the first voltage, and the second output circuit outputs the third voltage, thereby taking the first digital signal output state, and the first output circuit is configured to output the third voltage. And the second output circuit outputs the first voltage to take the second digital signal output state, and both the first output circuit and the second output circuit are the first output circuit.
  • a sixth digital speaker driving device is provided which takes the state of the third digital signal output by outputting the voltage of 2.
  • the ⁇ modulator, the post-filter, and the s driving circuits are formed on a single semiconductor or enclosed in a single package.
  • a seventh digital speaker driving apparatus is provided.
  • a digital speaker having a plurality of input terminals and a digital speaker driving device that is connected to a digital input signal and a power source to drive the digital speaker, and the digital speaker driving device is disposed immediately after a coil group of the digital speaker.
  • An eighth digital speaker device is provided.
  • a delta-sigma modulator that modulates a digital input signal and outputs an n-bit digital signal; a post-filter that is connected to the delta-sigma modulator and outputs an m-bit digital signal that is mismatch-shaped from the n-bit digital signal; S drive circuits that receive a part of the m-bit digital signal and output a digital signal, and s drive elements that are driven by the corresponding s drive circuits, respectively,
  • a ninth digital speaker device having r diaphragms driven by a part of the s drive elements, wherein s and r are both 2 or more.
  • the digital speaker includes a plurality of coils which are driven by different digital signals and vibrate a common diaphragm.
  • an eleventh digital speaker device wherein the plurality of coils are twisted and wound.
  • a digital actuator comprising a magnetostrictive element and a plurality of coils each driven by a different digital signal and applying a magnetic field to the magnetostrictive element.
  • a delta-sigma modulator that modulates a digital input signal and outputs an n-bit digital signal; a post-filter that is connected to the delta-sigma modulator and outputs an m-bit digital signal that is mismatch-shaped from the n-bit digital signal; S drive circuits that receive a part of the m-bit digital signal and output the digital signal, and s electrostatic elements that are driven by the corresponding s drive circuits.
  • a twelfth digital speaker device is provided.
  • the ⁇ modulator, the post filter, the s drive circuits, and the s electrostatic elements are formed on the same substrate.
  • a digital speaker device is provided.
  • a digital speaker driving apparatus for driving a digital speaker having s digital signal terminals, a ⁇ modulator that modulates a digital input signal and outputs an n-bit digital signal, and an n-bit digital signal connected to the ⁇ modulator.
  • a post filter for outputting an m-bit digital signal obtained by mismatch shaping the signal, a digital delay control circuit for outputting a delayed m-bit digital signal by delay-controlling the m-bit digital signal, and S number of drive circuits that receive a part of the m-bit digital signal and output the digital signal, and that the delay time of the digital delay control circuit is controlled for each output according to the control signal.
  • a fourteenth digital speaker driving device is provided.
  • a flat display ; a plurality of digital speakers arranged side by side on at least one side of the flat display; and a delay control circuit for controlling a delay time of a drive signal supplied to the plurality of digital speakers according to a control signal.
  • a flat display device is provided.
  • a fifteenth digital speaker device is provided.
  • a first portable electronic device comprising a digital speaker and a driving device that drives the digital speaker without converting the digital signal into an analog signal, and is driven by a battery.
  • a featured second portable electronic device is provided.
  • a digital speaker device characterized in that control is performed so as to cancel.
  • a wireless receiver that receives a digital signal, a digital speaker driving device that generates a plurality of drive signals without converting the output of the wireless receiver into an analog signal, and a digital speaker that is driven by the plurality of drive signals
  • a third portable electronic device configured is provided.
  • a digital speaker system for driving a digital speaker having s sets of digital signal terminals wherein the digital speaker system modulates a digital input signal and outputs an n-bit digital signal, and is connected to the ⁇ modulator and is n bits
  • a post filter that outputs an m-bit digital signal obtained by mismatch-shaping the digital signal and a part of the m-bit digital signal that corresponds to the s sets of digital signal terminals and outputs a digital signal.
  • Each of the s drive circuits, and each of the s drive circuits includes a first output circuit connected to a first input terminal of a corresponding digital signal terminal, and the first of the digital signal terminals.
  • a second output circuit connected to a second input terminal paired with the first input terminal, and the drive circuit includes the first output circuit.
  • a sixteenth digital speaker driving device is provided which takes at least three digital signal output states in accordance with a combination of a first digital signal input to the second output signal and a second digital signal input to the second output circuit. Is done.
  • the digital signal input to the ⁇ modulator is a serial / parallel conversion of a 1-bit input signal to p bits, and the bit number is larger than both n and p.
  • a seventeenth digital speaker driving device obtained by sampling is provided.
  • the driving circuit includes the first input terminal and the second input terminal when the first digital signal and the second digital signal are the same digital signal.
  • the digital signal output state becomes the same potential.
  • the first output circuit and the second output circuit may include a first source transistor and a first sink transistor connected in series to which the first digital signal is input.
  • a nineteenth digital speaker driving device constituting an H-bridge circuit in which a connection point between the second source transistor and the second sink transistor is connected to a corresponding digital signal terminal.
  • the digital sensor has a peak sensor for calculating an amplitude value of a sound represented by the digital input signal, and the post filter calculates the number of bits of the output digital signal by the peak sensor.
  • a twentieth digital speaker driving device is provided which performs control according to the amplitude value.
  • the twenty-first digital speaker driving device is provided in which the post filter outputs a digital signal having a smaller number of bits as the amplitude value calculated by the peak detector is smaller.
  • a digital speaker driving apparatus that drives a plurality of digital speakers each having s digital signal terminals, a ⁇ modulator that modulates a digital input signal and outputs an n-bit digital signal, and is connected to the ⁇ modulator, a post-filter that outputs an m-bit digital signal obtained by mismatch-shaping an n-bit digital signal; a digital delay control circuit that outputs a delayed m-bit digital signal by delay-controlling the m-bit digital signal; Each of the delayed m-bit digital signals is inputted with a part of the s number of driving circuits for outputting the digital signals, and a sensor for sensing information about a person or an object existing in the surroundings, and is sensed by the sensors.
  • the digital delay control circuit In response to a control signal generated based on the received information, the digital delay control circuit A twenty-second digital speaker driving device characterized in that an extension time is controlled and directivity of sound reproduced by the plurality of digital speakers is controlled to the direction or position of the person or object detected by the sensor. Is provided.
  • the senor is provided with a twenty-third digital speaker driving device which is an imaging device or an infrared sensor for photographing surrounding images.
  • the senor is provided as the twenty-fourth digital speaker driving apparatus, which is an ultrasonic sensor.
  • a twenty-fifth digital speaker driving device in which all or some of the plurality of digital speakers generate ultrasonic waves sensed by the sensor.
  • a digital speaker driving apparatus for driving a digital speaker having s digital signal terminals, a ⁇ modulator that modulates a digital input signal and outputs an n-bit digital signal, and an n-bit digital signal connected to the ⁇ modulator.
  • a post filter for outputting an m-bit digital signal obtained by mismatch shaping the signal, a digital delay control circuit for outputting a delayed m-bit digital signal by delay-controlling the m-bit digital signal, and
  • s number of drive circuits for inputting a part of the m-bit digital signal and outputting the digital signal, and a microphone for detecting ambient sound, the sound having a phase opposite to the sound detected by the microphone is A twenty-sixth digital speaker produced by the digital speaker Dynamic device is provided.
  • the twenty-sixth digital speaker drive device further comprises another digital speaker, and has a plurality of digital speakers, wherein the digital delay control circuit controls the delay time of the m-bit digital signal system for each digital speaker.
  • a digital speaker driving apparatus according to the twenty-seventh aspect that outputs a delayed m-bit digital signal is provided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Headphones And Earphones (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
PCT/JP2009/059867 2008-06-16 2009-05-29 デジタルスピーカー駆動装置 Ceased WO2009154067A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP09766515.2A EP2187657A4 (en) 2008-06-16 2009-05-29 DRIVE DEVICE FOR DIGITAL SPEAKERS
CN200980100413.4A CN101803401B (zh) 2008-06-16 2009-05-29 数字扬声器驱动装置、数字扬声器装置、数字致动器、平面显示器装置和便携式电子设备
US12/659,813 US8306244B2 (en) 2008-06-16 2010-03-22 Digital speaker driving apparatus
US13/665,320 US9226053B2 (en) 2008-06-16 2012-10-31 Digital speaker driving apparatus
US14/919,349 US9693136B2 (en) 2008-06-16 2015-10-21 Digital speaker driving apparatus

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP2008-156284 2008-06-16
JP2008156284 2008-06-16
JP2008314905A JP5396588B2 (ja) 2008-06-16 2008-12-10 デジタルスピーカー駆動装置，デジタルスピーカー装置，アクチュエータ，平面ディスプレイ装置及び携帯電子機器
JP2008-314929 2008-12-10
JP2008-314905 2008-12-10
JP2008314929A JP5552620B2 (ja) 2008-06-16 2008-12-10 デジタルスピーカー駆動装置と集中制御装置とを搭載した自動車
JP2008-314438 2008-12-10
JP2008314438A JP5552614B2 (ja) 2008-06-16 2008-12-10 デジタルスピーカー駆動装置，デジタルスピーカー装置，アクチュエータ，平面ディスプレイ装置及び携帯電子機器

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US12/659,813 Continuation US8306244B2 (en) 2008-06-16 2010-03-22 Digital speaker driving apparatus

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EP (1) EP2187657A4 (https=)
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