WO2001039543A1 - Oreillette-microphone et circuit de communication audio duplex integral l'utilisant - Google Patents

Oreillette-microphone et circuit de communication audio duplex integral l'utilisant Download PDF

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Publication number
WO2001039543A1
WO2001039543A1 PCT/JP2000/008221 JP0008221W WO0139543A1 WO 2001039543 A1 WO2001039543 A1 WO 2001039543A1 JP 0008221 W JP0008221 W JP 0008221W WO 0139543 A1 WO0139543 A1 WO 0139543A1
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WO
WIPO (PCT)
Prior art keywords
circuit
input
output
signal
earphone
Prior art date
Application number
PCT/JP2000/008221
Other languages
English (en)
Japanese (ja)
Inventor
Masahisa Masuda
Original Assignee
Micro M's 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.)
Filing date
Publication date
Application filed by Micro M's Inc. filed Critical Micro M's Inc.
Priority to AU14194/01A priority Critical patent/AU1419401A/en
Publication of WO2001039543A1 publication Critical patent/WO2001039543A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/62—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio
    • H04B1/64—Volume compression or expansion arrangements

Definitions

  • the present invention relates to an earphone having a microphone function through air conduction in the ear canal of a voice to be uttered, and a full-duplex audio communication circuit using only one of the earphones without electrical feedback.
  • Conventional earphones include a bone-conduction microphone that picks up bone-conducted voice vibration and a bone-conduction earphone microphone that incorporates sound pressure-type speed in the same case.
  • a compression bimorph is used as a sound S-electric signal conversion element, which is housed in the ear opening of the earphone microphone case, detects bone conduction voice vibration, and simultaneously outputs a speaker from the opening at the tip of the ear hole insertion section.
  • a microphone function for converting the sound signal into a car electric signal through the air conduction inside I, and an electric signal output that converts the audio signal current received from the outside into sound and transmits it to the inner ear via the air conduction in the ear canal Proposal of a full-duplex audio communication circuit that can easily design a handset circuit without electronic feedback by using only one earphone with a microphone function without sound howling that has both an audio input conversion earphone function and did.
  • Fig. 6 shows a block diagram of a conventional example that is a heavy audio communication circuit but the improvement is not sufficient.
  • 200 indicates the conventional full-duplex audio communication circuit (handset circuit section), 10 indicates an output terminal, 11 indicates an input terminal, and 12 indicates input / output of an earphone having a microphone function.
  • G 1 and Z 1 respectively indicate the reception voltage at the input terminal and the equivalent load resistance at the output terminal.
  • G 2 and Z 2 indicate the output voltage and the equivalent load resistance at the input / output terminals, respectively.
  • the operation is as follows.
  • the input signal G1 from the input terminal 11 is output to the load resistor Z2 through the input / output terminal 12 via the operational amplifier amplifier circuit A1 and the resistor circuit R1.
  • the input voltage G 2 from the input / output terminal 12 is output to the load resistor Z 1 through the output terminal 10 via the resistor circuit R 2 and the operational amplifier amplifier circuit A 2.
  • the signal component passing through the output terminal 10 includes the signal component passing from the input terminal 11 through the operational amplifier amplifier circuit A1, the resistor circuit R1, R2, and the operational amplifier amplifier circuit A2.
  • a branch circuit is provided between the input terminal 11 and the connection point 13 between the input terminal 11 and the resistor circuit R 2 and the operational amplifier amplifier circuit as shown in FIG.
  • the branch circuit comprises an operational amplifier anti-amplifying circuit I 1 and a gain / phase adjusting circuit 14.
  • the branch circuit and the resistor circuit R2 form a cancel circuit 15 for the input signal G1. That is, first, the input signal G 1 input from the first input terminal 15 a of the cancel circuit 15 is inverted in phase by the operational amplifier inverting amplifier circuit I 1. Adjust so that the input signal G1 from the second input terminal 15b and the input signal G1 passing through the resistor circuit R2 have the same amplitude and opposite phase, and combine them at the connection point 13 to cancel only the input signal G1 component Set to match, and output from output terminal 15c of cancel circuit 15. Therefore, the output terminal 10 should be a component of only the input voltage from the input / output terminal, In practice, however, it is difficult to completely cancel them out, usually around 30 dB.
  • each circuit constant of the cancellation circuit 15 In order to further increase the amount of electrical feedback cancellation by the cancellation circuit 15 as shown in Fig. 6 and further reduce it to 40 dB or less, set each circuit constant of the cancellation circuit 15 accurately. However, if any of these circuit constants has a constant shift change from the constant value, the amount of cancellation drops sharply, so the stable cancellation circuit was limited to about 130 dB.
  • an object of the present invention is to provide a howling simultaneously provided with a sound input-to-electrical signal output conversion microphone function and, conversely, an electric signal input-to-acoustic output earphone function.
  • a compressor and a decompressor are combined with the canceling circuit 15, and
  • Another object of the present invention is to provide a full-duplex audio communication circuit capable of stably obtaining a cancellation amount of about 160 dB. Disclosure of the invention
  • an earphone having a microphone function is a magnetic type earphone having a microphone function that includes at least a vibrating member, a magnetic member adhered to the vibrating member, and a coil unit that winds the magnetic member.
  • the vibrating member receives the air vibration of the voice to be uttered through the air conduction in the ear canal, and vibrates the magnetic member, thereby generating an audio signal current in the coil unit.
  • Conversion microphone function
  • An audio signal current sent from the outside is passed through the coil section, and the magnetic member is vibrated to generate a sound wave generated in the vibrating member through the air conduction.
  • the sound wave is received by the vibrating member via air conduction in the ear canal of the uttered voice, and the coil portion is displaced in the static magnetic field gap of the magnetic circuit, thereby generating a voice current in the coil portion.
  • a sound input-to-electrical signal output conversion microphone function
  • the present invention is a crystal type earphone having a microphone function provided with a piezoelectric element member, wherein the sound wave is received by the piezoelectric element member through air conduction in an ear hole of a sound to be uttered, and the piezoelectric element member is displaced and vibrated.
  • a sound input-to-electrical signal output conversion microphone function for generating a sound voltage
  • a sound signal voltage transmitted from the outside simultaneously with the uttered sound is applied to the piezoelectric element member, and a sound wave generated by displacement vibration of the piezoelectric element member is output into the ear hole through the air conduction.
  • a full-duplex audio communication circuit of a handset circuit unit of a communication device there is provided a full-duplex audio communication circuit of a handset circuit unit of a communication device.
  • Claim 1 Only one earphone having a microphone function by air conduction in the ear canal according to claim 2 or 3,
  • a connection point between the second impedance circuit and the second amplifier circuit and the input terminal An inverting amplifier circuit and a branch circuit including a gain / phase adjusting circuit in series with the inverting amplifier circuit,
  • the second impedance circuit and the branch circuit combine a signal received from the input terminal at a signal combining connection point therebetween to form a cancel circuit that is canceled, and a cancel circuit on the input terminal side
  • the input to the first input terminal is input via the first compressor, the input / output terminal side cancel circuit
  • the second input terminal is input via the second compressor, and the combined input signal of these is canceled Is output to an output terminal via a decompressor.
  • first and second compressors are compressed to 12 in logarithmic ratio, and the expander is expanded to 2 times in logarithmic ratio.
  • first and second amplifier circuits are each an operational amplifier amplifier circuit
  • the inverting amplifier circuit is an operational amplifier inverting amplifier circuit
  • the first and second impedance circuits are each a resistor circuit.
  • the communication device is a mobile phone, and the input terminal and the output terminal are connected to a reception circuit and a transmission circuit of the mobile phone main body, respectively, so that a component of the reception signal is canceled in the transmission signal.
  • the full-duplex audio communication circuit of the present invention is a full-duplex audio communication circuit of a communication device.
  • Claim 1 Only one earphone having a microphone function by air conduction in the ear canal according to claim 2 or 3,
  • amplification circuit connected therebetween and an impedance circuit in series therewith; a transmission signal from the input / output terminal of the earphone And a first AZD converter, a first compressor, a decompressor, and a DZA converter connected in series between the output terminal and the output terminal of the handset circuit.
  • a connection point between the first compressor and the decompressor and the input terminal is provided.
  • a second AD converter, a second compressor, and a branch circuit comprising an adaptive digital filter having a feedback input terminal and performing gain-phase control, which is connected in series to the first compression circuit.
  • a signal synthesizing circuit provided between the filter and the branch circuit, synthesizing the received digital signal from the input terminal, returning the synthesized output to the feedback input terminal of the adaptive digital filter, The digital signal processing is performed so that is minimized.
  • first and second compressors perform compression by a logarithmic ratio of 1 to 2, and the expander expands by a logarithmic ratio to twice.
  • the amplifier circuit is an operational amplifier amplifier circuit
  • the impedance circuit is a resistance circuit
  • FIG. 1 is a block diagram of a full-duplex audio communication circuit according to an embodiment of the present invention
  • FIG. 2 is a diagram showing an example of a signal level of each part in the block diagram of FIG. 1 of the present invention.
  • the key FIG. 3 is a block diagram of a full-duplex audio communication circuit according to another embodiment of the present invention
  • FIG. FIG. 5 is a diagram showing an earphone having a microphone function of the present invention
  • FIG. 6 is a block diagram of a conventional full-duplex audio communication circuit.
  • FIG. 7 is a diagram showing an example of the signal level of each part in the block diagram of FIG. 6 of the conventional example, where the cancellation amount is calculated at 30 dB.
  • FIG. 5 shows a structural diagram of an earphone having a microphone function according to the present invention.
  • FIG. 5 (a) shows an embodiment of a magnetic earphone 50
  • (b) shows an embodiment of a dynamic earphone 60
  • (c) shows an embodiment of a crystal earphone 70.
  • Fig. 5 (a) shows a force having a shape with an ear canal insertion portion 50a.
  • Fig. 5 (b) may have a shape 50b that can be fitted into the auricle of the auricle.
  • FIG. 5 (c) may have any of the above-mentioned shapes.
  • 51 is a diaphragm
  • 52 is a permanent magnet and its support
  • 53 is a coil around which a permanent magnet is wound
  • 54 is an input / output terminal connected to both ends of the coil. It is.
  • the vibration plate 51 is vibrated through the I insertion part 50a, the permanent magnet 52 connected to it is vibrated, and a voice signal current is generated in the coil part 53 (sound input-electric signal output conversion microphone function). ).
  • FIG. 5 (b) An audio current sent from the outside is passed through the coil section 53, and the magnetic magnet 52 is vibrated to vibrate the diaphragm 51, pass through the ear hole insertion section 50a, and pass through the air conduction in the ear hole. Transmit to the inner ear (Electrical signal input, one sound output conversion earphone function). Both of the above conversions can be performed simultaneously.
  • 61 is a diaphragm
  • 62 is a permanent magnet
  • 63 is a coil part
  • 64 is an input / output terminal connected to both ends of a voice coil
  • 65 is a magnetic yoke.
  • the uttered voice passes through the central hole of the insertion hole 50b via the air conduction in the ear canal.
  • the vibrating membrane 61 is vibrated, and the coil unit 63 connected thereto is vibrated.
  • an audio current sent from the outside flows through the coil section 63, vibrates the coil section 63, vibrates the vibrating membrane 61 connected thereto, and transmits the vibration to the inner ear via the air conduction in the ear canal. . Both of the above conversions can be performed simultaneously.
  • 71 is a vibrating membrane
  • 72 is a piezoelectric element material attached thereto
  • Reference numeral 73 denotes a supporting metal plate
  • reference numeral 74 denotes input / output terminals connected to the vibrating membrane 72 and the supporting metal plate 73, respectively.
  • the uttered voice passes through the ear canal opening 50a via air conduction in the ear canal, vibrates the vibrating membrane 71, and is applied to the piezoelectric element material 72 sandwiched between the vibrating membrane 71 and the supporting metal plate 73. Apply oscillating pressure. As a result, the audio voltage generated at both ends is output from the input / output terminal 74.
  • the audio voltage transmitted from the outside is input from the input / output terminal 74, applied to the piezoelectric element material 72, the piezoelectric element material 72 vibrates, and the diaphragm 71 attached thereto is vibrated. It is transmitted to the inner ear via air conduction in the ear canal. Both of the above conversions can be performed simultaneously.
  • reference numeral 100 denotes a full-duplex audio communication circuit (transmitter / receiver circuit unit) according to the first embodiment of the present invention.
  • reference numeral 100 denotes a full-duplex audio communication circuit (transmitter / receiver circuit unit) according to the first embodiment of the present invention.
  • the same functions as those in FIG. 6 of the conventional example are denoted by the same reference numerals, and the description thereof is omitted.
  • 16 is a first compressor
  • 17 is a second compressor
  • 18 is a decompressor
  • the input signal from input terminal 11 passes through input / output terminal 12 via operational amplifier amplifier circuit A 1 (first amplifier circuit) and resistor circuit R 1 (first impedance circuit) to load Z 2. Output.
  • the input voltage G 2 from the input / output terminal 12 is applied to the second compressor 1 Through the output terminal 10 via the operational amplifier amplifier circuit A 2 (second amplifier circuit) and the expander 18 to the load resistor Z 1.
  • the signal component passing through the output terminal 10 is fed from the input terminal 11 through the operational amplifier A1, the resistor R1, the compressor 17, the resistor R2, the operational amplifier A2, and the expander 18.
  • the input signal component from the input terminal 11 to be fed back is included.
  • the input terminal 11 passes through the first compressor 16 through the operational amplifier inverting amplifier I 1 and the branch circuit composed of the gain / phase adjustment circuit 14 and the connection point 1 3
  • the resistor circuit R2 and the branch circuit form a cancel circuit for canceling an input signal component from the input terminal 11.
  • the input signal from the input terminal 11 passes through the compressor 16 and is input from the first input terminal 15a of the cancel circuit 15 and the phase is inverted by the operational amplifier inverting amplifier circuit, and the gain * phase is adjusted.
  • the input signal from the second input terminal 15b of the cancel circuit and the input signal passing through the resistor R2 have the same amplitude as the input signal, adjust the phase to the opposite phase, and combine them at the connection point to cancel the input signal.
  • And output from the output terminal 15c of the cancel circuit At the same time, the input signal from the input / output terminal passes without being canceled.
  • Compression is log ratio 12 and decompression is log ratio 2.
  • the log ratios can be 1/3, 3x, 1/4, and 4x, respectively, but gradually the sound becomes unnatural.
  • the input voltage G 1 from the input terminal is set to 0 dBV, and the voltage level (d BV) at each part is indicated by a solid line and an arrow.
  • the input voltage G2 from the input / output terminal is set to 0 dBVV, and the voltage level (dBV) at each part is indicated by a broken line and an arrow.
  • FIG. 7 shows the voltage levels (dBV) at the respective parts in FIG. 6 of the conventional example.
  • the attenuator (13 dB) 19 and the operational amplifier (6 dB) A3 are for explanation. It is inserted so that the level of each part is the same in Fig. 2 and Fig. 7, and it is not necessary.
  • the output level at the output terminal 10 in FIG. 7 of the conventional example has a difference of 30 dB, whereas in FIG. There is a difference of 60 dB, and it turns out that the logarithmic ratio is twice as much as before.
  • FIG. 3 shows another embodiment of the present invention.
  • reference numeral 150 denotes a full-duplex audio communication circuit (handset circuit section) according to a second embodiment of the present invention.
  • the same functions as those in FIG. 6 of the conventional example are denoted by the same reference numerals, and description thereof will be omitted.
  • Reference numeral 20 denotes a range constituted by digital circuits
  • 21.22 denotes first and second AZD converters for performing analog-to-digital conversion
  • 23 denotes DZA converters for performing digital-to-analog conversion
  • 24 and 25 each denote a DZA converter.
  • the first and second compressors, 26 is a decompressor
  • 27 is an adaptive-digital filter
  • 27a is a gain / phase control input terminal of an adaptive digital 'filter
  • 28 is a digital signal synthesizing circuit.
  • the operation is as follows.
  • the input signal from the input terminal 11 passes through the operational amplifier amplifier circuit A 1 and the resistor circuit R 1 and is output from the input / output terminal to the load resistor Z 2.
  • the input signal from the input / output terminal 12 enters the first AD converter 21, becomes a digital signal, and enters the first compressor 24.
  • the signal enters the expander 26, enters the 0-to-8 converter 23, and outputs an analog signal from the output terminal 10 to the load resistor Z1.
  • the input signal from the input terminal 11 is input to the second AZD converter 22 and converted into a digital signal. , Then into an adaptive 'digital' filter 27.
  • the output and the input signal passed through the first compressor 24 are combined with a digital signal combining circuit 28.
  • the synthesized signal is input to the feedback input terminal 27a of the adaptive 'digital' filter 27, and the adaptive digital filter 2 is controlled so that the synthesized signal is minimized. Change and adjust the gain and phase of 7. In other words, it is used as a gain / phase adjustment circuit.
  • the adaptive ⁇ digital ⁇ filter can cope with changes in the load resistance Z2 at the input / output terminals.
  • FIG. 5 shows a communication device using the full-duplex audio communication circuit (handset circuit unit) 100 and 150 of the present invention.
  • Fig. 5 (a) shows a communication device with a telephone circuit connected to the input / output terminals, a speaker connected to the output terminals, and a microphone connected to the input terminals.
  • the full-duplex audio communication circuit (handset circuit) is a side tone suppression circuit.
  • Fig. 5 (b) shows an earphone microphone that has the function of an amphoteric microphone connected to the input / output terminal, the output terminal connected to the transmitter of the mobile phone from the microphone, and the input terminal connected to the receiver and the receiver.
  • This is a mobile phone in which a received signal from an input terminal is canceled, and a cancellation position at an output terminal is set to about 160 dB.
  • Fig. 5 (c) shows a speaker microphone that has the function of a microphone, connected to the input and output terminals, uses two sets of full-duplex audio communication circuits (handset circuits), and has an output terminal at the input terminal.
  • the full-duplex audio communication circuit (handset circuit section) of the present invention has the following effects.
  • the conventional example is said to be the limit for stable operation.
  • 30 dB is greatly improved, and about 60 dB stable

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Telephone Function (AREA)

Abstract

La présente invention concerne un circuit de communication audio duplex intégral n'utilisant qu'une seule oreillette capable de fonctionner réversiblement comme microphone, et permettant d'améliorer encore plus la suppression du retour. Pour améliorer encore plus la suppression du retour, on combine un compresseur et un expanseur avec un circuit d'annulation de façon à annuler le retour utilisant la même amplitude et la phase inverse.
PCT/JP2000/008221 1999-11-22 2000-11-21 Oreillette-microphone et circuit de communication audio duplex integral l'utilisant WO2001039543A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU14194/01A AU1419401A (en) 1999-11-22 2000-11-21 Earphone having microphone function, and full-duplex audio communication circuitusing the same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP11/331485 1999-11-22
JP33148599A JP2001157292A (ja) 1999-11-22 1999-11-22 マイク機能を有するイヤホン並びにそれを用いた全二重オーディオ通信回路

Publications (1)

Publication Number Publication Date
WO2001039543A1 true WO2001039543A1 (fr) 2001-05-31

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Application Number Title Priority Date Filing Date
PCT/JP2000/008221 WO2001039543A1 (fr) 1999-11-22 2000-11-21 Oreillette-microphone et circuit de communication audio duplex integral l'utilisant

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JP (1) JP2001157292A (fr)
AU (1) AU1419401A (fr)
WO (1) WO2001039543A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10555102B2 (en) 2014-05-20 2020-02-04 Bugatone Ltd. Aural measurements from earphone output speakers

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011023848A (ja) 2009-07-14 2011-02-03 Hosiden Corp ヘッドセット

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06319190A (ja) * 1992-03-31 1994-11-15 Souei Denki Seisakusho:Yugen レシーバーとマイクロホーンを一体化したイヤホーンの構成方法装置
JPH08195994A (ja) * 1995-01-13 1996-07-30 Mitsubishi Electric Corp 骨伝導イヤホンマイク

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06319190A (ja) * 1992-03-31 1994-11-15 Souei Denki Seisakusho:Yugen レシーバーとマイクロホーンを一体化したイヤホーンの構成方法装置
JPH08195994A (ja) * 1995-01-13 1996-07-30 Mitsubishi Electric Corp 骨伝導イヤホンマイク

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10555102B2 (en) 2014-05-20 2020-02-04 Bugatone Ltd. Aural measurements from earphone output speakers

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JP2001157292A (ja) 2001-06-08
AU1419401A (en) 2001-06-04

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