EP2736266A1 - Dispositif de traitement de signal et casque d'écoute actif avec un tel dispositif de traitement de signal - Google Patents

Dispositif de traitement de signal et casque d'écoute actif avec un tel dispositif de traitement de signal Download PDF

Info

Publication number
EP2736266A1
EP2736266A1 EP12193699.1A EP12193699A EP2736266A1 EP 2736266 A1 EP2736266 A1 EP 2736266A1 EP 12193699 A EP12193699 A EP 12193699A EP 2736266 A1 EP2736266 A1 EP 2736266A1
Authority
EP
European Patent Office
Prior art keywords
signal
signal processing
processing device
processing circuit
spc
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.)
Withdrawn
Application number
EP12193699.1A
Other languages
German (de)
English (en)
Inventor
Oliver Jones
Horst GETHER
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.)
Ams Osram AG
Original Assignee
Ams AG
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 Ams AG filed Critical Ams AG
Priority to EP12193699.1A priority Critical patent/EP2736266A1/fr
Publication of EP2736266A1 publication Critical patent/EP2736266A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1041—Mechanical or electronic switches, or control elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/02—Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups
    • H04R2201/028—Structural combinations of loudspeakers with built-in power amplifiers, e.g. in the same acoustic enclosure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
    • H04R2460/01—Hearing devices using active noise cancellation

Definitions

  • the invention relates to a signal processing device, which generates a processed output signal based on an input signal, and to an active headphone with such a signal processing device.
  • Such active accessories may include signal processing portions, which actively process an input signal in order to provide an output signal thereof.
  • the signal processing portion is unpowered, no output signal can be generated in conventional accessories, thus the active accessory delivers no function.
  • An object to be solved is to provide an improved concept for active circuits being operated unpowered.
  • the improved concept is based on the idea that a signal processing circuit, which actively processes an input signal in order to generate an output signal during normal operation conditions, is made electrically transparent if there is not enough power to actively operate the signal processing circuit.
  • a bypass switch is provided, which connects a signal input to a signal output of the signal processing circuit, wherein the bypass switch is normally on and has to be switched off actively. For example, if a suitable supply for the signal processing circuit is detected, the bypass switch can be controlled to a non-conducting state, hence activating the function of the signal processing circuit. In the unpowered state, the output signal is identical to the input signal such that a minimum functionality of such an arrangement is achieved.
  • an embodiment of a signal processing device comprises a signal processing circuit having a signal input for receiving an input signal and a signal output for providing a processed output signal on the basis of the input signal.
  • the signal processing device further comprises a supply terminal for supplying a supply signal to the signal processing circuit, and a bypass switch connecting the signal input to the signal output.
  • the bypass switch is in a conductive state in case no control signal is applied to a control terminal of the bypass switch.
  • the signal processing device additionally comprises a control circuit that is configured to detect whether the supply signal at the supply terminal is suitable for operation of the signal processing circuit, and to control the bypass switch to a non-conducting state based on a detected suitable supply signal.
  • the bypass switch is in a conducting state and electrically connects the signal input to the signal output without any further intervention needed.
  • the signal processing circuit comprises functionality for amplifying and/or filtering the input signal
  • the output signal is identical to the input signal in the state of no or insufficient power, allowing usage of the output signal respectively the input signal.
  • the conducting bypass switch makes the signal processing circuit transparent as if it was not there.
  • no output signal is present in case of unpowered operation, such that the conventional signal processing device has no remaining function.
  • control circuit detects a suitable supply for the signal processing circuit, it actively disables the bypass switch and thus allows the signal processing circuit to process the input signal as desired.
  • the bypass switch comprises a switching relay.
  • the switching relay may be arranged externally to an integrated circuit comprising a signal processing circuit and a control circuit.
  • the signal processing circuit, the supply terminal, the bypass switch and the control circuit are integrated in a joint integrated circuit.
  • the bypass switch comprises a depletion-mode transistor, in particular a depletion-mode field-effect-transistor.
  • the depletion-mode transistor can also be provided externally to the integrated circuit.
  • the signal processing device may be produced in a standard CMOS process with little effort.
  • the control circuit is configured to compare the supply signal to a threshold signal in order to detect whether the supply signal is suitable.
  • the threshold signal may also be a threshold level, which may be defined by characteristics of circuit parts. Hence, if the supply signal, for example a supply voltage, exceeds a given threshold level, the control circuit can deactivate the bypass switch such that the signal processing circuit can perform its desired signal processing of the input signal.
  • the control circuit comprises a power-on reset circuit.
  • power-on reset circuits or POR circuits are well-known to the skilled person and are usually used to activate an electronic circuit if power, in particular enough power, is provided to the electronic circuit.
  • the detection signal of the POR circuit can also be used as a basis for deactivating the bypass switch.
  • the signal processing circuit may also be actively deactivated or switched off, even if a suitable power supply is preset. For example, a user can switch off the signal processing circuit or the signal processing device, respectively. According to an embodiment of the improved concept, the signal processing circuit can be made transparent in this case too.
  • the signal processing circuit is configured to be switched between an activated state and a deactivated state.
  • the control circuit is configured to control the bypass switch to a conductive state in case the signal processing circuit is switched to the deactivated state.
  • the function of the signal processing circuit may be an amplification of the input signal, such that the output signal is either an amplified version of the input signal or, in the deactivated state of the signal processing circuit, the input signal itself.
  • a user may select to have either the original signal or an amplified signal.
  • the signal processing device described above are described with a single signal input and a single signal output for the sake of simplicity.
  • the signal processing circuit may have more signal inputs and more signal outputs associated with each other.
  • two or more signal inputs and signal outputs may be present for providing a stereo signal or other multichannel audio signals.
  • respective bypass switches may be provided for each signal channel, i.e. between each signal input and their corresponding signal output.
  • the signal processing circuit comprises a plurality of signal inputs and a plurality of signal outputs, wherein each of the signal outputs is, by means of a respective bypass switch, connected to one of the signal inputs associated therewith.
  • the bypass switches are controlled commonly. In other words, all bypass switches are activated together or deactivated together, respectively.
  • the various embodiments of the signal processing device can be produced and operated with little effort.
  • the possibility of integrating various embodiments of the described signal processing device allows for a higher quality and smaller solutions.
  • the costs can be reduced due to the lower component count.
  • the mechanical size of the signal processing device is reduced, allowing for easier integration with other parts.
  • a signal processing device may be used in various applications where an input signal is processed actively to produce an output signal.
  • the function of the signal processing circuit may contain some sort of amplification or filtering or a combination thereof.
  • the improved concept may particularly be advantageous in applications where the unprocessed input signal is still useful compared to the processed signal, although with a reduced quality of service.
  • a signal processing device may be used in an active headphone.
  • Such an active headphone may comprise at least one loudspeaker and a signal processing device according to one of the embodiments described above.
  • An audio input of the headphone is connected to the signal input for receiving an audio signal.
  • the at least one loudspeaker is connected to the signal output.
  • a battery connector is connected to the supply terminal.
  • the signal processing circuit is configured to generate a loudspeaker signal at the signal output based on the audio signal.
  • a battery in particular a rechargeable battery, can be connected to the battery connector for supplying the signal processing device.
  • the control circuit does not detect a suitable supply for the signal processing circuit.
  • the bypass switch is left in or brought to the conducting state in order to make the signal processing circuit transparent. Consequently, in the unpowered or low-powered case, the input signal or audio signal is directly provided to the loudspeaker without processing. If a suitable supply is detected by the control circuit, the bypass switch is deactivated or brought to a non-conducting state and the signal processing circuit can operate as desired. In any case, some sort of loudspeaker signal is provided to the loudspeaker such that a minimum functionality of the headphone is achieved.
  • the signal processing circuit can have more than one signal input and corresponding signal output, for example for processing a stereo audio signal. Accordingly, for each of the audio channels, a respective bypass switch is provided. It is self-explanatory that the headphone has at least two loudspeakers in this configuration.
  • a signal processing device is implemented having the signal processing circuit being switchable between an activated state and a deactivated state as described above.
  • the control circuit is configured to control a bypass switch to a conducting state in case the signal processing circuit is switched to the deactivated state.
  • the headphone further comprises an activation switch for switching the signal processing circuit between the activated state and the deactivated state.
  • the headphone further comprises a microphone for providing a microphone signal.
  • the signal processing circuit is configured to provide the loudspeaker signal based on audio signal and the microphone signal in order to perform active noise cancellation, ANC.
  • Active noise cancellation headphones use a microphone signal in order to provide ambient noise to a signal processing circuit, which generates, e.g. by means of filtering and amplification, a compensation signal being basically opposite to the ambient noise.
  • the compensation signal is combined with the original audio signal and provided to the loudspeaker.
  • the ambient noise and the compensation signal at least partially cancel out each other.
  • Such active noise cancellation systems are well-known in the art.
  • the headphone can still be used to play the audio signal, however without active noise cancellation.
  • a suitable supply returns, for example by changing or recharging the battery, or by activating the signal processing circuit with the ANC functionality, the bypass switches are automatically deactivated and the processed audio signal is provided to the loudspeaker.
  • FIG. 1 shows an exemplary embodiment of a signal processing device SD that comprises a signal processing circuit SPC.
  • the signal processing circuit SPC has a signal input IN1 and a signal output OUT1.
  • the signal input IN1 and the signal output OUT1 are further connected by a bypass switch SW1, which in this embodiment comprises a switching relay SR.
  • the signal processing device SS further comprises a supply terminal SUP for supplying a supply signal to the signal processing circuit SPC.
  • a control circuit CC is connected to the supply terminal SUP and has a control output for controlling the bypass switch SW1.
  • the signal processing device is configured to receive an input signal at the signal input IN1, which is to be processed by the signal processing circuit SPC for providing a processed output signal on the basis of the input signal at the signal output OUT1.
  • this processing can only be performed if a suitable supply signal is provided at the supply input SUP, for example at least a predetermined supply voltage.
  • the bypass switch SW1 is normally on, i.e. in a conducting state, in case no control signal is applied to a control terminal of the bypass switch SW1. Hence, if not controlled otherwise, the bypass switch SW1 electrically connects the signal input IN1 to the signal output OUT2, thus making the signal processing circuit SPC transparent.
  • the control circuit CC is configured to detect whether the supply signal at the supply terminal is suitable for operation of the signal processing circuit SPC. If a suitable supply signal is detected, the bypass switch SW1 is controlled to a non-conducting state by the control circuit CC. Furthermore, the signal processing circuit SPC can be brought to a normal mode of operation, thus processing the input signal.
  • the signal processing circuit SPC stops operation and the bypass switch SW1 is controlled to the conducting state again.
  • the bypass switch SW1 automatically returns to the conducting state, as no control signal is present at its control terminal.
  • the signal processing device itself remains usable with a limited functionality.
  • the signal processing circuit may amplify and/or filter the input signal to generate the output signal, such that in the bypass state of the bypass switch SW1, the output signal becomes the unfiltered and/or unamplified input signal. This happens without any active intervention from a user.
  • the signal processing device consumes no power in the case of the bypass switch being activated due to loss of power.
  • FIG. 2 shows a further exemplary embodiment of a signal processing device SD, which is mainly based on the embodiment of Figure 1 .
  • the signal processing circuit SPC, the control circuit CC and the bypass switch SW1 are integrated on a joint integrated circuit IC.
  • the bypass switch SW1 comprises a depletion-mode field-effect-transistor, which is embodied as a p-channel field-effect-transistor in this case.
  • the integration within an integrated circuit allows the usage of standard CMOS-based technology, for example. Additionally, the integrated circuit implies lower costs, better quality and smaller solutions.
  • the control circuit CC may be configured to compare the supply signal at the supply terminal SUP to a threshold signal or a threshold level in order to detect whether the supply signal is suitable for operation of the signal processing circuit SPC.
  • the control circuit CC comprises an implementation of a well-known power-on reset circuit.
  • a power-on reset, POR POR
  • Such a power-on reset, POR, circuit conventionally serves the function of indicating to an electronic circuit that sufficient supply is present for operating the electronic circuit.
  • such a POR circuit may additionally serve the function of generating the control signal for the bypass switch SW1 for deactivating the bypass switch SW1. If a POR circuit is already provided within a signal processing device, no or little additional effort is needed for the detection function of the control circuit CC.
  • Figure 3 shows a further embodiment of a signal processing device SD, which is based on the previous embodiments of Figure 1 and Figure 2 .
  • various components are integrated in a joint integrated circuit IC.
  • the signal processing circuit SPC of Figure 3 which is indicated by two adjustable amplifiers for simplicity reasons, comprises a first signal input IN1, a second signal input IN2, a first signal output OUT1 and a second signal output OUT2.
  • the signal processing circuit SPC comprises two audio channels, which are processed by the signal processing circuit SPC, respective processed signals being provided to a first and a second loudspeaker LS1, LS2 connected to the signal outputs OUT1, OUT2.
  • a first bypass switch SW1 is connected between the first signal input IN1 and the first signal output OUT1.
  • a second bypass switch SW2 is connected between the second signal input IN2 and the second signal output OUT2.
  • Each of the bypass switches SW1, SW2 comprises a depletion-mode field-effect-transistor P1, P2 as described for the embodiment of Figure 2 .
  • the depletion-mode field-effect-transistors are normally on and can be actively controlled to a non-conducting state.
  • the control circuit CC comprises a power management block PM connected to the supply terminal SUP.
  • a battery BAT is connected to the supply terminal SUP for supplying the signal processing device SD.
  • the control circuit CC further comprises a bypass control logic block BCL, which at its output is connected to the control terminals or gate terminals of the transistors P1, P2.
  • the bypass control logic block BCL may contain driver circuits for generating respective control signals for the transistors P1, P2. For example, gate voltages for the transistors P1, P2 are generated by means of a charge pump based on the supply signal.
  • control circuit CC comprises a power logic block PL connected to an activation input ACT.
  • An activation signal can be provided to the activation terminal ACT by means of an activation switch SWA that can be switched between a high and a low voltage potential.
  • the power logic block PL interacts with the bypass control logic block BCL to indicate an activation or deactivation state of the signal processing device SD, respectively the signal processing circuit SPC.
  • the power logic block PL interacts with the power management block PM in both directions for indicating the above-described information to the power management block PM and for receiving information about the state of a power supply from the power management block PM. Such information about the state of the power supply is further indicated from the power management block PM to the bypass control logic BCL.
  • the power management block PM may comprise a POR circuit as described above.
  • the power management block PM cannot detect a suitable supply for operating the signal processing circuit SPC.
  • the bypass switches SW1, SW2, respectively the transistors P1, P2 are in their normally on state, thus conducting and connecting the respective signal inputs IN1, IN2 electrically to the signal outputs OUT1, OUT2.
  • the bypass control logic BCL controls the transistors P1, P2 to a non-conducting state, thus deactivating the bypass between signal inputs and signal outputs.
  • the function of the signal processing circuit SPC is turned off or deactivated.
  • the deactivated state of the signal processing circuit SPC is indicated to the bypass control logic BCL, which then reactivates the bypass between signal inputs and signal outputs by controlling the transistors P1, P2 to the conducting state.
  • some kind of output signal is present at the signal outputs OUT1, OUT2, namely either a processed input signal or an unprocessed input signal.
  • the signal processing device SD retains a basic functionality for the user.
  • the functionality of the signal processing circuit SPC may contain further functions in addition to the mere amplification. For example, filtering or processing of additional signals like sensor signals or microphone signals or the like may be included in the generation of the processed output signal. Furthermore, more than the two depicted processing channels can be provided, such that the signal processing circuit SPC can comprise a greater number of signal inputs and a greater number of signal outputs associated with the respective signal inputs.
  • Figure 4 shows a possible implementation form of the signal processing device SD according to one of the embodiments described above.
  • Figure 4 shows an active headphone HP comprising the signal processing device SD as an integrated circuit IC.
  • the headphone HP comprises a loudspeaker LS1, a microphone MIC, a battery BAT and an activation switch SWA.
  • LS1 loudspeaker
  • MIC microphone MIC
  • BAT battery BAT
  • SWA activation switch
  • the microphone MIC is configured to provide a microphone signal in particular to record ambient noise around the headphone and to provide the microphone signal to the signal processing circuit SPC.
  • the signal processing circuit SPC is configured to generate its output signal, namely a loudspeaker signal for the loudspeaker LS1 based on an audio signal provided at its signal input and the microphone signal in order to perform active noise cancellation, ANC.
  • the signal processing circuit within the integrated circuit IC can provide the loudspeaker signal with active noise cancellation, which improves the hearing quality of the headphone.
  • the microphone signal is processed by amplifying and filtering in order to generate a compensation signal.
  • the compensation signal is combined with the audio signal in order to provide the loudspeaker signal.
  • Such ANC systems are well-known in the art.
  • the user can have an improved hearing impression.
  • the signal processing circuit within the integrated circuit IC will be bypassed by respective bypass switches as described above.
  • the user can use the headphones for playing the audio signal via the loudspeaker LS1.
EP12193699.1A 2012-11-21 2012-11-21 Dispositif de traitement de signal et casque d'écoute actif avec un tel dispositif de traitement de signal Withdrawn EP2736266A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12193699.1A EP2736266A1 (fr) 2012-11-21 2012-11-21 Dispositif de traitement de signal et casque d'écoute actif avec un tel dispositif de traitement de signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12193699.1A EP2736266A1 (fr) 2012-11-21 2012-11-21 Dispositif de traitement de signal et casque d'écoute actif avec un tel dispositif de traitement de signal

Publications (1)

Publication Number Publication Date
EP2736266A1 true EP2736266A1 (fr) 2014-05-28

Family

ID=47428483

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12193699.1A Withdrawn EP2736266A1 (fr) 2012-11-21 2012-11-21 Dispositif de traitement de signal et casque d'écoute actif avec un tel dispositif de traitement de signal

Country Status (1)

Country Link
EP (1) EP2736266A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106101895A (zh) * 2016-06-30 2016-11-09 华峰君 一种降噪耳机及控制噪音消除电路开启或关闭的方法
CN108632710A (zh) * 2018-05-11 2018-10-09 深圳市天微电子股份有限公司 主动降噪芯片、装置及方法

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4412245A (en) * 1980-10-01 1983-10-25 Gte Products Corporation Differential current detector in cable television trunk amplifier station
JPS61148985A (ja) * 1984-12-21 1986-07-07 Pioneer Electronic Corp Ｃａｔｖの伝送回路
JPS648748A (en) * 1987-06-30 1989-01-12 Mitsubishi Cable Ind Ltd Line concentration device for duplicated loop type local area network
JPH04213986A (ja) * 1990-12-12 1992-08-05 Hochiki Corp Ｃａｔｖシステム用増幅器
JPH0614036A (ja) * 1992-06-24 1994-01-21 Hitachi Cable Ltd トークンリングｌａｎ用ハブ
EP0792075A2 (fr) * 1996-02-26 1997-08-27 Hewlett-Packard Company Dispositif pour la modification d'un message applicable au réseau de signalisation de télécommunication
JP2000207654A (ja) * 1999-01-19 2000-07-28 Nohmi Bosai Ltd 防災システム
JP2001007942A (ja) * 1999-06-21 2001-01-12 Nec Eng Ltd 電子式回線切換装置
EP2131354A2 (fr) * 2008-05-15 2009-12-09 Kabushiki Kaisha Audio- Technica Écouteur antibruit

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4412245A (en) * 1980-10-01 1983-10-25 Gte Products Corporation Differential current detector in cable television trunk amplifier station
JPS61148985A (ja) * 1984-12-21 1986-07-07 Pioneer Electronic Corp Ｃａｔｖの伝送回路
JPS648748A (en) * 1987-06-30 1989-01-12 Mitsubishi Cable Ind Ltd Line concentration device for duplicated loop type local area network
JPH04213986A (ja) * 1990-12-12 1992-08-05 Hochiki Corp Ｃａｔｖシステム用増幅器
JPH0614036A (ja) * 1992-06-24 1994-01-21 Hitachi Cable Ltd トークンリングｌａｎ用ハブ
EP0792075A2 (fr) * 1996-02-26 1997-08-27 Hewlett-Packard Company Dispositif pour la modification d'un message applicable au réseau de signalisation de télécommunication
JP2000207654A (ja) * 1999-01-19 2000-07-28 Nohmi Bosai Ltd 防災システム
JP2001007942A (ja) * 1999-06-21 2001-01-12 Nec Eng Ltd 電子式回線切換装置
EP2131354A2 (fr) * 2008-05-15 2009-12-09 Kabushiki Kaisha Audio- Technica Écouteur antibruit

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"Harman Kardon CL Headphones, Are One Of Five New Headphones From Harman Kardon", THESTREET.COM PRESS RELEASES, 12 June 2012 (2012-06-12), XP055056401, Retrieved from the Internet <URL:http://www.thestreet.com/story/11577477/1/harman-kardon-cl-headphones-are-one-of-five-new-headphones-from-harman-kardon-photo-business-wire.html> [retrieved on 20130313] *
TEXAS INSTRUMENTS INCORPORATED: "TLV320AIC3101 LOW-POWER STEREO AUDIO CODEC FOR PORTABLE AUDIO/TELEPHONY", December 2008 (2008-12-01), XP055056392, Retrieved from the Internet <URL:www.ti.com/lit/ds/symlink/tlv320aic3101.pdf> [retrieved on 20130313] *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106101895A (zh) * 2016-06-30 2016-11-09 华峰君 一种降噪耳机及控制噪音消除电路开启或关闭的方法
CN108632710A (zh) * 2018-05-11 2018-10-09 深圳市天微电子股份有限公司 主动降噪芯片、装置及方法

Similar Documents

Publication Publication Date Title
US20170078814A1 (en) Microphone biasing circuitry and method thereof
US8073153B2 (en) System and method for engaging in conversation while using an earphone
CN104754484A (zh) 具有可切换电源电压的听力设备
US9319003B2 (en) Audio amplifier
EP0842562A1 (fr) Circuit d&#39;egalisation a commutation automatique
JP2011139415A (ja) オーディオ信号増幅回路、反転増幅器およびそれを用いた電子機器
EP2736266A1 (fr) Dispositif de traitement de signal et casque d&#39;écoute actif avec un tel dispositif de traitement de signal
US7023983B2 (en) Versatile circuit for interfacing with audio headsets
JP5254251B2 (ja) トランシーバ等の通信機のスピーカ付ハンドマイクにおける音声入出力自動切替回路
JP2015097385A (ja) 中断可能なマイクロフォン電源を有する聴覚機器
JP5060369B2 (ja) 出力バッファー回路
US20180025719A1 (en) Low-Power-Consumption Active Noise-Reduction In-Ear Music Earphone and Method for Noise Reduction
JP5157933B2 (ja) 信号切換回路
KR101648042B1 (ko) ANC(Active Noise Cancellation) 기능을 가지는 휴대폰용 이어폰 시스템
KR102543614B1 (ko) 연산 증폭기에 대한 오프셋을 제거하는 오프셋 제거 회로
EP2866471B1 (fr) Instrument auditif avec alimentation de microphone interruptible
JP5218089B2 (ja) 信号切換回路
KR101762923B1 (ko) 오디오 장치 및 오디오 출력 포트
US10477308B2 (en) Circuit and a receiver comprising the circuit
US11197109B2 (en) Hearing device with active vent comprising solenoid
JP2009296478A (ja) 増幅回路
JP2002330488A (ja) 音声信号再生回路及びノイズキャンセリングヘッドホン回路
JP5336635B2 (ja) 出力バッファー回路
JP4934376B2 (ja) 放送装置
JP2011139232A (ja) 電気機器

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20121121

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20141129