WO2017197749A1 - 取电方法、降噪耳机及播放设备 - Google Patents

取电方法、降噪耳机及播放设备 Download PDF

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Publication number
WO2017197749A1
WO2017197749A1 PCT/CN2016/090326 CN2016090326W WO2017197749A1 WO 2017197749 A1 WO2017197749 A1 WO 2017197749A1 CN 2016090326 W CN2016090326 W CN 2016090326W WO 2017197749 A1 WO2017197749 A1 WO 2017197749A1
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Prior art keywords
audio signal
noise reduction
noise
module
circuit
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PCT/CN2016/090326
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English (en)
French (fr)
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赵桀
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中兴通讯股份有限公司
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Publication of WO2017197749A1 publication Critical patent/WO2017197749A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • 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
    • H04R1/1083—Reduction of ambient noise
    • 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
    • H04R1/1025—Accumulators or arrangements for charging

Definitions

  • This document relates to but not limited to the field of communication, and in particular to a power taking method, a noise canceling earphone and a playing device.
  • noise pollution is becoming more and more serious. Whether it is business travel, daily travel, or work and living environment, noise is everywhere. Since it can't control the noise source, it can only prevent it from entering the ear, so a variety of noise-reducing headphones have emerged.
  • the noise canceling earphone mainly has two categories: passive noise reduction and active noise reduction.
  • the passive noise canceling earphone is generally an earphone or a headphone made of a material with better sound insulation effect, and the ear is inserted into the sound hole to be tight, and the physical sound insulation effect is obtained, and the noise reduction effect is not so good and comfortable.
  • the active noise canceling earphone collects the external environmental noise through the microphone at the earphone speaker, and uses the noise reduction module built in the earphone to analyze the noise signal, and generate the sound with its opposite phase to play, weakening or canceling the external noise. Active noise reduction does not require the headphones to be too loud, and the requirements for the sound insulation of the headphones are not too high. Compared with passive noise reduction, it is more acceptable to users.
  • the active noise canceling earphone needs to provide power for the noise reduction chip, and generally adopts a built-in lithium battery or a dry battery method, which not only increases the size and weight, but also limits the use time of the earphone, and the battery has a service life, which increases the user's service life. A fee for subsequent replacement or repair of the battery.
  • the invention provides a power taking method, a noise canceling earphone and a playing device, which can solve a series of problems caused by the need for a built-in battery of the noise canceling earphone (such as increasing volume and weight, increasing user cost, etc.).
  • This article provides a noise canceling headset that includes:
  • Noise reduction module filter circuit and power take-off circuit
  • the filter circuit is configured to receive a mixed audio signal, filter the mixed audio signal into a first audio signal and a second audio signal, and the first audio signal is output to the noise reduction module, The second audio signal is output to the power take-off circuit;
  • the power take-off circuit is configured to convert the second audio signal into electrical energy to supply power to the noise reduction module.
  • the power take-off circuit includes: a series boost circuit, an alternating current variable DC rectifier circuit, and a voltage stabilizing circuit;
  • the boost circuit is configured to receive the second audio signal from the filter circuit
  • the voltage stabilizing circuit is configured to output the electrical energy to the noise reduction module.
  • the second audio signal is an audio signal having a set frequency
  • the first audio signal is an audio signal to be played, wherein the first audio signal and the second Audio signals have different frequencies.
  • the first audio signal and the second audio signal are synthesized into the mixed audio signal in a playing device connected to the noise canceling earphone, and the mixed audio signal is Is outputted by the playback device to the filter circuit.
  • the noise canceling headphone further includes: a noise reduction switch connected to the noise reduction module, configured to turn on or off a noise reduction function of the noise reduction module;
  • the noise reduction switch when the noise reduction switch is turned on, the mixed audio signal is transmitted to the filter circuit to turn on the noise reduction function; when the noise reduction switch is turned off, a third audio signal is transmitted to the A filter circuit to turn off the noise reduction function.
  • the noise canceling headphone further includes: a microphone, configured to be electrically connected to the terminal when the noise canceling earphone is inserted into the terminal, and connect one end of the noise reducing switch to the microphone and the noise reduction module The other end is connected to one end of the first resistor, and the other end of the first resistor is grounded.
  • This article also provides a playback device that includes:
  • a mixing module configured to combine the first audio signal and the second audio signal into a mixed audio signal
  • An output module configured to output the mixed audio signal to a noise canceling earphone, wherein the An audio signal is an audio signal to be played, and the second audio signal is used to power a noise reduction module in the noise canceling headphone.
  • the second audio signal is an audio signal having a set frequency, and the first audio signal and the second audio signal have different frequencies.
  • This article also provides a method of power taking, including:
  • the converting the second audio signal into electrical energy includes:
  • the boosting operation, the alternating current converting and rectifying operation, and the voltage stabilizing operation are sequentially performed on the second audio signal, and converted into electric energy.
  • the second audio signal is an audio signal having a set frequency
  • the first audio signal is an audio signal to be played, the first audio signal and the second audio.
  • the signals have different frequencies.
  • the to-be-powered module is a noise reduction module having a noise reduction function
  • the receiving the mixed audio signal includes:
  • a noise canceling headphone having the noise reduction module receives a mixed audio signal.
  • the method before the receiving the mixed audio signal, the method further includes:
  • the playback device When the noise reduction function of the noise reduction module is turned on, the playback device generates the mixed audio signal and outputs the noise canceling earphone with the noise reduction module.
  • the technical solution provided by the present invention directly utilizes the second audio signal in the received mixed audio signal to supply power to the noise reduction module therein.
  • This design makes the noise canceling headphone not need to have a built-in battery for the noise reduction module, and can solve the related technology and requires a built-in battery.
  • this method only requires external devices (such as mobile audio devices with audio playback functions) to output mixed audio signals and button detection functions. Yes, there is no need to require external equipment to reserve power for the noise-reduction headphones, so it has better versatility.
  • FIG. 1 is a schematic structural diagram of an embodiment of a playback device according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of an embodiment of a noise canceling earphone according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of an embodiment of a power take-off circuit according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a noise canceling earphone inserted into a playback device according to an embodiment of the present invention
  • FIG. 5 is a schematic flowchart diagram of an embodiment of a power take-off method according to an embodiment of the present invention.
  • FIG. 6 is a schematic flowchart diagram of another embodiment of a power take-off method according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic diagram of connection of a noise reduction switch according to an embodiment of the present invention.
  • FIG. 1 is a schematic structural diagram of a playback device according to an embodiment of the present invention.
  • the playback device 1 includes a mixing module 11, an amplification module 12, and an output module 13.
  • the sound mixing module 11 is electrically connected to the discharge module 12, and the amplification module 12 is also connected to an audio output interface (not shown) of the output module 13 to output an audio signal to the earphone inserted into the audio output interface.
  • the playing device 1 may be a smart phone, a tablet computer, a notebook computer, a personal digital assistant (PDA), or the like.
  • PDA personal digital assistant
  • the mixing module 11 can receive two audio signals, which are respectively a first audio signal and a second audio signal, and combine the first audio signal and the second audio signal into one audio signal (ie, a mixed audio signal), which will be synthesized.
  • the mixed audio signal is output to the amplification module 12.
  • the amplification module 12 amplifies the mixed audio signal and outputs it to the audio output interface of the output module 13.
  • the amplification module 12 is an optional module.
  • the first audio signal may be an audio signal to be played, such as a user-selected sound source, and the second audio signal may be a built-in sound having a specific frequency in the playback device 1.
  • the source whose frequency is generally different from the frequency of the first audio signal.
  • the second audio signal is generally set to a built-in sound source of 20 KHz (0 dBFS). It can be understood that 20 KHz is only an example and not a limitation of the embodiment of the present invention, and the playback device can output an ultrasonic sound source,
  • the second audio signal can have a higher frequency, such as an ultrasonic source.
  • the second audio signal is used to supply power to the noise reduction module inserted in the noise canceling earphone of the audio output interface of the playback device 1.
  • the structure and function of the noise canceling earphone will be described later.
  • the playback volume of the second audio signal can be set to the maximum regardless of the current playback volume level.
  • FIG. 2 it is a schematic diagram of a real structure of a noise canceling earphone according to an embodiment of the present invention.
  • the noise canceling earphone 2 includes a noise reduction module 21, a filter circuit 22, and a power take-off circuit 23.
  • the noise reduction module 21 is electrically connected to the filter circuit 22 and the power take-off circuit 23, respectively.
  • the filter circuit 22 is configured to receive a mixed audio signal, for example, the playback audio signal is from a playback device (such as the playback device 1 shown in FIG. 1) connected to the noise canceling earphone 1, and thus, as described in the description of FIG.
  • the mixed audio signal is synthesized by two audio signals, one of which is not for playing but for powering the noise reduction module 21.
  • the filter circuit 22 filters the mixed audio signal into a first audio signal and a second audio signal, wherein the first audio signal is provided to the noise reduction module 21, and the noise reduction module 21 performs noise reduction thereon. deal with.
  • the noise reduction module 21 can be utilized in the noise canceling earphone.
  • the ambient noise collected by the microphone generates a sound signal that is inverted from the ambient noise, and then outputs a first audio signal and the inverted sound signal through a speaker connected to the noise reduction module 21, and the user's ear will be the first An audio signal, ambient noise and an inverted sound signal, and the ambient noise and the inverted sound signal can achieve the purpose of canceling each other by superposition, and the purpose of noise reduction can be achieved.
  • the noise reduction module 21 needs electric energy when performing the noise reduction operation.
  • This electrical energy can be supplied by the power take-off circuit 23.
  • the power take-off circuit 23 receives the second audio signal output by the filter circuit 22, for example, an audio signal of 20 kHz (0 dBFS), and then converts the second audio signal into electrical energy to supply power to the noise reduction module 21.
  • the structure of the power take-off circuit 23 can be referred to FIG. 3.
  • Figure 3 can be used to illustrate how the power take-off circuit 23 converts the second audio signal into electrical energy. As shown in FIG.
  • the power take-off circuit 23 includes: a step-up circuit 231 in series, an AC-to-DC rectifier circuit 232, and
  • the voltage stabilizing circuit 233 is configured to sequentially perform a boosting operation, an alternating current variable DC and rectification operation, and a voltage stabilizing operation on the second audio signal, and convert the power into the power supply to supply the noise reduction module 21.
  • the circuit structure and working process of the boosting circuit 231, the alternating current variable DC rectifying circuit 232, and the voltage stabilizing circuit 233 are familiar to those skilled in the art, and are not described herein.
  • the noise canceling earphone of the embodiment directly uses the second audio signal in the received mixed audio signal to supply power to the noise reduction module therein.
  • This design makes the noise canceling earphone unnecessary for the built-in battery of the noise reduction module, and can solve the needs in the related art.
  • a series of problems caused by the built-in battery such as increased volume and weight of the noise canceling headphones, increased user costs and the like.
  • this method only requires an external device (such as a mobile terminal having an audio playback function) to output a mixed audio signal, and does not require an external device to reserve power for the noise canceling earphone. Therefore, the noise canceling earphone of the embodiment of the present invention is also Has a good versatility.
  • FIG. 4 it is a schematic diagram when the noise canceling earphone 2 is inserted into the playback device 1 (for example, a smart terminal) shown in FIG. 1.
  • the noise canceling earphone 2 may include a microphone 24 and a microphone in addition to the noise reduction module 21, the filter circuit 22 and the power taking circuit 23 shown in FIG. 2 . 25.
  • the microphone 24 can be a talk microphone of the noise canceling earphone, which can be connected to the microphone of the playing device 1.
  • the microphone 25 may be a microphone for collecting ambient noise, and is electrically connected to the noise reduction module 21 and configured to transmit the collected ambient noise to the noise reduction module 21, so that the noise reduction module 21 performs a noise reduction operation.
  • the speaker 26 can be a left channel speaker and a right channel speaker, and is configured to play an audio signal output by the noise reduction module.
  • the noise reduction switch 27 is connected to the noise reduction module 21 and is set to turn on or off the noise reduction function of the noise reduction module. When the noise reduction switch is turned on, the playback device 1 transmits the mixed audio signal to the filter circuit 22, and the power take-off circuit 23 supplies power to the noise reduction module 21 to turn on the noise reduction function.
  • the playback device 1 transmits a third audio signal (which may also be referred to as a pure audio signal, such as a user-selected sound source) to the filter circuit 22, at which time the filter circuit 22 does not provide the power take-off circuit 23. Any audio signal, therefore the power take-off circuit 23 cannot supply power to the noise reduction module 21, and the noise reduction function is turned off.
  • the LED indicator 28 is set to indicate whether the noise reduction function is turned on, and it can be integrated with the noise reduction switch 27.
  • one end of the noise reduction switch 27 is connected to the terminal of the microphone 24, the microphone
  • the wind is electrically connected to the playback device 1, that is, to the microphone of the playback device 1
  • the noise reduction module 21 is also connected to the end of the noise reduction earphone.
  • the other end of the noise reduction switch 27 is connected to the ground through a series connected 100 ohm resistor (which may also be other resistance values).
  • the playback device 1 and the noise reduction module 21 can know whether the noise reduction switch is turned on or off by detecting the voltage of the connection node with the noise reduction switch 21.
  • FIG. 5 is a schematic diagram of an implementation process of a power take-off method according to an embodiment of the present invention. It includes the following steps 51 to 54:
  • Step 51 Receive a mixed audio signal.
  • Step 52 Filter the mixed audio signal into a first audio signal and a second audio signal.
  • Step 53 output the first audio signal to the module to be powered
  • Step 54 Convert the second audio signal into electrical energy, and provide the module to be powered to supply power to the module to be powered.
  • the converting the second audio signal into the electrical energy in step 54 may include: sequentially performing a boosting operation, an alternating current converting and rectifying operation, and a voltage stabilizing operation on the second audio signal to convert into electrical energy.
  • the second audio signal is an audio signal having a set frequency, the first audio signal being an audio signal to be played, the first audio signal and the second audio signal having different frequencies.
  • the power supply module may be the noise reduction module 21 of the noise reduction function in FIG. 2 .
  • FIG. 5 can be combined with the previously described embodiment of FIG. 2, that is, the steps of FIG. 5 are performed by the modules of the FIG. 2 embodiment to effect powering the noise reduction module 21 of FIG.
  • steps 51-53 can be performed by filter circuit 22, and step 54 can be performed by power take-off circuit 53. Therefore, the details and extensions of each step in this embodiment may be referred to the embodiment shown in FIG. 2 and FIG. 3, and details are not described herein.
  • FIG. 6 is a schematic flowchart diagram of another implementation manner of a power take-off method according to an embodiment of the present invention, which includes steps 61 to 69:
  • Step 61 Insert the noise canceling headphone into a playback device (such as a smart terminal).
  • Step 62 Determine whether the noise reduction switch is turned on, that is, determine whether the noise reduction function of the noise canceling headphone is turned on. If it is turned on, it is determined that the noise reduction function of the noise canceling headphone is turned on, and step 63 is performed. If it is turned off, it is determined that the noise reduction function of the noise canceling headphone is turned off, and step 67 is performed.
  • Step 63 The playing device plays the first audio signal (generally the music selected by the user), and plays the second audio signal of 20 KHz in the background to generate a mixed audio signal.
  • first audio signal generally the music selected by the user
  • second audio signal of 20 KHz in the background
  • Step 64 The filter receives the mixed audio signal and filters it into a first audio signal and a second audio signal, respectively, to steps 65 and 66.
  • Step 65 The second audio signal of the 20 KHz is converted into electric energy by the power taking circuit, and is supplied to the noise reduction module.
  • Step 66 The noise reduction module performs a noise reduction function and then outputs the audio. Go to step 69.
  • Step 67 The playback device plays a third audio signal (also referred to as a pure audio signal, which can generally select music for the user).
  • a third audio signal also referred to as a pure audio signal, which can generally select music for the user.
  • Step 68 The filter filters the third audio signal (pure audio signal). Since it is the third audio signal (pure audio signal), the filter does not play a substantial filtering effect, but directly outputs the third audio signal (pure audio signal).
  • Step 69 The headset speaker plays the received audio, such as the audio from step 66 or step 68.
  • the second audio signal in the received mixed audio signal is directly used to supply power to the noise reduction module.
  • the design of the noise canceling headphone does not need to be a built-in battery for the noise reduction module, and the built-in battery can be solved in the related art.
  • this method only requires external devices (such as mobile terminals).
  • the device with audio playback function can output mixed audio signals, and does not require external devices to reserve power for the noise-reducing headphones, so it has good versatility.

Abstract

一种取电方法、降噪耳机及播放设备。其中该降噪耳机包括：降噪模块、滤波电路和取电电路；其中，所述滤波电路，设置为接收混合音频信号，将所述混合音频信号过滤为第一音频信号和第二音频信号，其中所述第一音频信号输出至所述降噪模块，所述第二音频信号输出至所述取电电路；所述取电电路，设置为将所述第二音频信号转换为电能，为所述降噪模块供电。

Description

取电方法、降噪耳机及播放设备 技术领域
本文涉及但不限于通信领域，尤其涉及一种取电方法、降噪耳机及播放设备。
背景技术
随着城市和工业的发展，噪音污染越来越严重，不管是商务旅行、日常出行，还是工作生活环境，噪音都无处不在。既然控制不了噪音源，那就只能阻止它进入耳朵，于是，多种多样的降噪耳机应运而生。
相关技术中，降噪耳机主要有被动降噪和主动降噪两大类。其中，被动降噪耳机一般是用隔音效果较好的材料制成的入耳耳机或头戴式耳机，把耳朵入音孔堵严实，起到物理隔音的效果，降噪效果并不太好，舒适度也不够。而主动降噪耳机会通过耳机喇叭处的麦克风采集外界环境噪声，利用耳机内置的降噪模块来分析噪声信号，产生与其反相的声音进行播放，减弱或抵消外界噪声。主动降噪不需要耳机声音过大，对耳机隔音材质要求也不过高，相比被动降噪，更容易被用户所接受。
但是，主动降噪耳机由于需要给降噪芯片供电，一般采用了内置锂电池或者干电池的方法，这不仅增加了体积和重量，还限制了耳机的使用时长，由于电池也有使用寿命，给用户增加了一笔后续更换或维修电池的费用。
发明内容
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。
本文提供一种取电方法、降噪耳机及播放设备，可以解决所述降噪耳机需要内置电池所导致的一系列问题(如增加体积和重量，增加用户成本等)。
本文提供了一种降噪耳机，包括：
降噪模块、滤波电路和取电电路；
其中，所述滤波电路，设置为接收混合音频信号，将所述混合音频信号过滤为第一音频信号和第二音频信号，所述第一音频信号输出至所述降噪模块，将所述第二音频信号输出至所述取电电路；
所述取电电路，设置为将所述第二音频信号转换为电能，对所述降噪模块供电。
可选地，上述降噪耳机中，所述取电电路包括：串联的升压电路、交流变直流整流电路以及稳压电路；
所述升压电路设置为接收来自所述滤波电路的所述第二音频信号；
所述稳压电路设置为向所述降噪模块输出所述电能。
可选地，上述降噪耳机中，所述第二音频信号为具有设定频率的音频信号，所述第一音频信号为待播放的音频信号，其中所述第一音频信号和所述第二音频信号具有不同的频率。
可选地，上述降噪耳机中，所述第一音频信号和所述第二音频信号是在与所述降噪耳机相连的播放设备中合成为所述混合音频信号的，所述混合音频信号是由所述播放设备输出至所述滤波电路的。
可选地，上述降噪耳机还包括：降噪开关，与所述降噪模块连接，设置为开启或关闭所述降噪模块的降噪功能；
其中，当所述降噪开关打开时，所述混合音频信号被传递至所述滤波电路，以开启所述降噪功能；当所述降噪开关关闭时，第三音频信号被传递至所述滤波电路，以关闭所述降噪功能。
可选地，上述降噪耳机还包括：麦克风，设置为当所述降噪耳机插入终端时，与所述终端电性连接，所述降噪开关的一端连接所述麦克风和所述降噪模块，另一端连接第一电阻的一端，所述第一电阻的另一端接地。
本文还提供了一种播放设备，包括：
混音模块，设置为将第一音频信号和第二音频信号合成为混合音频信号；
输出模块，设置为将所述混合音频信号输出至降噪耳机，其中，所述第 一音频信号为待播放的音频信号，所述第二音频信号用于为所述降噪耳机中的降噪模块供电。
可选地，上述播放设备中，所述第二音频信号为具有设定频率的音频信号，所述第一音频信号和所述第二音频信号具有不同的频率。
本文还提供了一种取电方法，包括：
接收混合音频信号，将所述混合音频信号过滤为第一音频信号和第二音频信号，其中，所述第一音频信号输出至待供电模块；
将所述第二音频信号转换为电能，提供至所述待供电模块，为所述待供电模块供电。
可选地，上述取电方法中，所述将所述第二音频信号转换为电能包括：
对所述第二音频信号依次执行升压操作、交流变直流并整流操作、和稳压操作，转换成电能。
可选地，上述取电方法中，所述第二音频信号为具有设定频率的音频信号，所述第一音频信号为待播放的音频信号，所述第一音频信号和所述第二音频信号具有不同的频率。
可选地，上述取电方法中，所述待供电模块为具有降噪功能的降噪模块，所述接收混合音频信号包括：
具有所述降噪模块的降噪耳机接收混合音频信号。
可选地，上述取电方法中，在所述接收混合音频信号前，还包括：
当所述降噪模块的降噪功能开启时，播放设备产生所述混合音频信号，并输出至具有所述降噪模块的降噪耳机。
本文提供的技术方案，直接利用接收的混合音频信号中的第二音频信号为其中的降噪模块供电，此种设计使得降噪耳机无需为降噪模块内置电池，可以解决相关技术中需要内置电池所导致的一系列问题，如增加了降噪耳机的体积和重量，增加了用户成本等。另外，此种方式仅要求外部设备(如移动终端等具有音频播放功能设备)能够输出混合音频信号和按键检测功能即 可，无需要求外部设备为降噪耳机预留电源，因此具有较好的通用性。
在阅读并理解了附图和详细描述后，可以明白其他方面。
附图概述
图1是本发明实施例提供的播放设备的实施例的结构示意图；
图2是本发明实施例提供的降噪耳机的实施例的结构示意图；
图3是本发明实施例提供的取电电路的实施例的结构示意图；
图4是本发明实施例提供的降噪耳机插入播放设备时的示意图；
图5本发明实施例提供的取电方法的一种实施例的流程示意图；
图6是本发明实施例提供的取电方法的另一种实施例的流程示意图；
图7为本发明实施例提供的降噪开关的连接示意图。
本发明的实施方式
下文中将结合附图对本文的实施例进行详细说明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互任意组合。
如图1所示，是本发明实施例的播放设备的结构示意图。该播放设备1包括：混音模块11、放大模块12和输出模块13。其中，该混音模块11与放电模块12电性连接，该放大模块12还连接至输出模块13的音频输出接口(图未示出)，以向插入该音频输出接口的耳机输出音频信号。其中，该播放设备1可以是智能手机、平板电脑、笔记本电脑、个人数字助理(PDA)等。其中该混音模块11可以接收两路音频信号，分别为第一音频信号和第二音频信号，将第一音频信号和第二音频信号合成为一路音频信号(即混合音频信号)，将合成的混合音频信号输出至放大模块12。该放大模块12对该混合音频信号进行放大后，输出至输出模块13的音频输出接口。其中，放大模块12为可选模块。其中，该第一音频信号可以为待播放的音频信号，例如用户选择的音源，而该第二音频信号可以为播放设备1中具有特定频率的内置音 源，其频率一般不同于第一音频信号的频率。可选地，该第二音频信号一般设置为20KHz(0dBFS)的内置音源，可以理解的是，20KHz仅是示例而非本发明实施例的限制，在播放设备能够输出超声波音源的前提下，该第二音频信号可以具有更高的频率，如为超声波音源。其中，该第二音频信号用于为插入该播放设备1的音频输出接口的降噪耳机中的降噪模块供电，降噪耳机的结构和功能等会在后面介绍。另外，为了保证后续能够为降噪模块供应足量的电力，在播放设备1中，无论当前的播放音量的大小被设置得如何，均可以将第二音频信号的播放音量设为最大。
如图2所示，是本发明实施例的降噪耳机的实结构示意图。该降噪耳机2包括：降噪模块21、滤波电路22和取电电路23。
其中，降噪模块21分别与滤波电路22和取电电路23电性连接。其中，滤波电路22，设置为接收一混合音频信号，例如该混合音频信号来自与该降噪耳机1连接的播放设备(如图1所示的播放设备1)，因此由图1的描述可知，该混合音频信号由两路音频信号合成，其中一路并非是用于播放而是用于为降噪模块21供电。接收到该混合音频信号之后，滤波电路22将该混合音频信号过滤为第一音频信号和第二音频信号，其中第一音频信号提供至降噪模块21，由降噪模块21对其进行降噪处理。可以理解的是，降噪模块21的降噪原理及工作过程是本领域技术人员是熟悉的，在此不进行说明，而仅做如下简单介绍：降噪模块21可以是利用降噪耳机中的麦克风采集到的环境噪声来产生与环境噪声反相的声音信号，然后通过与降噪模块21连接的喇叭输出第一音频信号和该反相的声音信号，此时进入用户耳朵的将会是第一音频信号、环境噪声和反相的声音信号，而环境噪声和反相的声音信号通过叠加能够达到相互抵消的目的，可以实现降噪的目的。
其中，降噪模块21在执行降噪操作时，需要电能。该电能可以由取电电路23为其提供。可选地，取电电路23接收滤波电路22输出的第二音频信号，例如为20KHz(0dBFS)的音频信号，然后将该第二音频信号转换为电能，对降噪模块21进行供电。其中，取电电路23的结构可以参考图3所示。图3可以用于说明取电电路23是如何将第二音频信号转换为电能的。如图3所示，取电电路23包括：顺序串联的升压电路231、交流变直流整流电路232以及 稳压电路233，设置为对该第二音频信号依次做升压操作、交流变直流及整流操作、稳压操作，转变为电源可以给降噪模块21供电。其中，升压电路231、交流变直流整流电路232以及稳压电路233的电路结构及工作过程对于本领域技术人员是熟悉的，在此不赘述。
本实施例的降噪耳机，直接利用接收的混合音频信号中的第二音频信号为其中的降噪模块供电，此种设计使得降噪耳机无需为降噪模块内置电池，可以解决相关技术中需要内置电池所导致的一系列问题，如增加了降噪耳机的体积和重量，增加了用户成本等。另外，此种方式仅要求外部设备(如移动终端等具有音频播放功能设备)能够输出混合音频信号即可，无需要求外部设备为降噪耳机预留电源，因此本发明实施例的降噪耳机也具有较好的通用性。
如图4所示，是降噪耳机2插入图1所示的播放设备1(例如可为智能终端)时的示意图。在图示中，示出了降噪耳机的诸多细节，例如降噪耳机2除了图2所示的降噪模块21、滤波电路22和取电电路23之外，还可以包括：麦克风24、麦克风25、喇叭26、降噪开关27及LED指示灯28。其中麦克风24可以为降噪耳机的通话麦克，其可以与播放设备1的麦克风连接。其中，麦克风25可以是用于采集环境噪音的麦克风，其与降噪模块21电性连接，设置为将采集到的环境噪音传递至降噪模块21，以便于降噪模块21执行降噪操作。其中，喇叭26可以为左声道喇叭和右声道喇叭，设置为播放降噪模块输出的音频信号。其中降噪开关27与降噪模块21连接，设置为开启或关闭降噪模块的降噪功能。其中，当降噪开关打开时，播放设备1将混合音频信号传递至滤波电路22，通过取电电路23为降噪模块21供电，以开启降噪功能。当降噪开关关闭时，播放设备1将第三音频信号(也可以称为纯的音频信号，如用户选择的音源)传递至滤波电路22，此时滤波电路22不会向取电电路23提供任何音频信号，因此取电电路23无法为降噪模块21供电，关闭降噪功能。其中，LED指示灯28设置为指示降噪功能是否开启，其可与降噪开关27集成为一体。
下面结合图7说明降噪模块21和播放设备1如何知晓降噪开关27的打开或关断。如图7所示，降噪开关27的一端连接麦克风24的端子，该麦克 风在降噪耳机插入播放设备时，会与播放设备1电性连接，即与播放设备1麦克风，降噪耳机的该端还连接降噪模块21。该降噪开关27的另一端通过串联100欧姆的电阻(也可以为其他阻值)到地。这样，播放设备1和降噪模块21即可通过检测该与降噪开关21的连接节点的电压来知道降噪开关是否打开或关闭。
如图5所示为，本发明实施例的取电方法的一种实现流程示意图。其包括如下步骤51至54：
步骤51：接收混合音频信号。
步骤52：将混合音频信号过滤为第一音频信号和第二音频信号。
步骤53：将第一音频信号输出至待供电模块；
步骤54：将第二音频信号转换为电能，提供至待供电模块，为待供电模块供电。
可选地，步骤54中的将第二音频信号转换为电能的操作可以包括：对第二音频信号依次执行升压操作、交流变直流并整流操作、和稳压操作，以转换成电能。可选地，第二音频信号为具有设定频率的音频信号，所述第一音频信号为待播放的音频信号，所述第一音频信号和所述第二音频信号具有不同的频率。其中，待供电模块可以为图2中的降噪功能的降噪模块21。
图5的实施例可以与前述的图2实施例结合，即由图2实施例的模块来执行图5的步骤，以实现对图2的降噪模块21的供电。例如，步骤51～53可以由滤波电路22来执行，而步骤54可以由取电电路53来执行。因此，本实施例每个步骤的细节以及扩展可以参考图2和图3所示的实施例中，在此不赘述。
如图6所示，是本发明实施例的取电方法的另一种实现实施例的流程示意图，其包括步骤61至69：
步骤61：将降噪耳机插入播放设备(如智能终端)。
步骤62：判断降噪开关是否打开，即判断降噪耳机的降噪功能是否开启。若打开，即判断降噪耳机的降噪功能开启，执行步骤63，若关闭，即判断降噪耳机的降噪功能关闭，执行步骤67。
步骤63：播放设备播放第一音频信号(一般为用户选择的音乐)，后台播放20KHz的第二音频信号，以生成一混合音频信号。
步骤64：滤波器接收该混合音频信号，并将其过滤为第一音频信号和第二音频信号，分别至步骤65和步骤66。
步骤65：由取电电路根据该20KHz的第二音频信号转换成电能，供应至降噪模块。
步骤66：降噪模块执行降噪功能，然后输出音频。跳转至步骤69。
步骤67：播放设备播放第三音频信号(也可称为纯的音频信号，一般可以为用户选择音乐)。
步骤68：滤波器对该第三音频信号(纯的音频信号)进行过滤。由于为第三音频信号(纯的音频信号)，因此滤波器并没有起到实质的过滤效果，而是直接输出该第三音频信号(纯的音频信号)。
步骤69：耳机喇叭播放收到的音频，例如来自步骤66或步骤68的音频。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序来指令相关硬件(例如处理器)完成，所述程序可以存储于计算机可读存储介质中，如只读存储器、磁盘或光盘等。可选地，上述实施例的全部或部分步骤也可以使用一个或多个集成电路来实现。相应地，上述实施例中的模块/单元可以采用硬件的形式实现，例如通过集成电路来实现其相应功能，也可以采用软件功能模块的形式实现，例如通过处理器执行存储于存储器中的程序指令来实现其相应功能。本申请不限制于任何特定形式的硬件和软件的结合。
工业实用性
本发明实施例，直接利用接收的混合音频信号中的第二音频信号为其中的降噪模块供电，此种设计使得降噪耳机无需为降噪模块内置电池，可以解决相关技术中需要内置电池所导致的一系列问题，如增加了降噪耳机的体积和重量，增加了用户成本等。另外，此种方式仅要求外部设备(如移动终端 等具有音频播放功能设备)能够输出混合音频信号即可，无需要求外部设备为降噪耳机预留电源，因此具有较好的通用性。

Claims (13)

  1. 一种降噪耳机，包括：降噪模块、滤波电路和取电电路；
    其中，所述滤波电路，设置为接收混合音频信号，将所述混合音频信号过滤为第一音频信号和第二音频信号，所述第一音频信号输出至所述降噪模块，将所述第二音频信号输出至所述取电电路；
    所述取电电路，设置为将所述第二音频信号转换为电能，对所述降噪模块供电。
  2. 根据权利要求1所述的降噪耳机，其中，所述取电电路包括：串联的升压电路、交流变直流整流电路以及稳压电路；
    所述升压电路设置为接收来自所述滤波电路的所述第二音频信号；
    所述稳压电路设置为向所述降噪模块输出所述电能。
  3. 根据权利要求1所述的降噪耳机，其中，所述第二音频信号为具有设定频率的音频信号，所述第一音频信号为待播放的音频信号，其中所述第一音频信号和所述第二音频信号具有不同的频率。
  4. 根据权利要求1所述的降噪耳机，其中，所述第一音频信号和所述第二音频信号是在与所述降噪耳机相连的播放设备中合成为所述混合音频信号的，所述混合音频信号是由所述播放设备输出至所述滤波电路的。
  5. 根据权利要求1至4任一项所述的降噪耳机，还包括：降噪开关，与所述降噪模块连接，设置为开启或关闭所述降噪模块的降噪功能；
    其中，当所述降噪开关打开时，所述混合音频信号被传递至所述滤波电路，以开启所述降噪功能；当所述降噪开关关闭时，第三音频信号被传递至所述滤波电路，以关闭所述降噪功能。
  6. 根据权利要求5所述的降噪耳机，还包括：麦克风，设置为当所述降噪耳机插入终端时，与所述终端电性连接，所述降噪开关的一端连接所述麦克风和所述降噪模块，另一端连接第一电阻的一端，所述第一电阻的另一端接地。
  7. 一种播放设备，包括：
    混音模块，设置为将第一音频信号和第二音频信号合成为混合音频信号；
    输出模块，设置为将所述混合音频信号输出至降噪耳机，其中，所述第一音频信号为待播放的音频信号，所述第二音频信号用于为所述降噪耳机中的降噪模块供电。
  8. 根据权利要求7所述的播放设备，其中，所述第二音频信号为具有设定频率的音频信号，所述第一音频信号和所述第二音频信号具有不同的频率。
  9. 一种取电方法，包括：
    接收混合音频信号，将所述混合音频信号过滤为第一音频信号和第二音频信号，其中，所述第一音频信号输出至待供电模块；
    将所述第二音频信号转换为电能，提供至所述待供电模块，为所述待供电模块供电。
  10. 根据权利要求9所述的取电方法，其中，所述将所述第二音频信号转换为电能包括：
    对所述第二音频信号依次执行升压操作、交流变直流并整流操作、和稳压操作，转换成电能。
  11. 根据权利要求9所述的取电方法，其中，所述第二音频信号为具有设定频率的音频信号，所述第一音频信号为待播放的音频信号，所述第一音频信号和所述第二音频信号具有不同的频率。
  12. 根据权利要求9至11任一项所述的取电方法，其中，所述待供电模块为具有降噪功能的降噪模块，所述接收混合音频信号包括：
    具有所述降噪模块的降噪耳机接收混合音频信号。
  13. 根据权利要求12所述的取电方法，其中，所述接收混合音频信号前，还包括：
    当所述降噪模块的降噪功能开启时，播放设备产生所述混合音频信号，并输出至具有所述降噪模块的降噪耳机。
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