WO2011113341A1 - 能够降低噪音的音频装置和降噪手机 - Google Patents

能够降低噪音的音频装置和降噪手机 Download PDF

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Publication number
WO2011113341A1
WO2011113341A1 PCT/CN2011/071786 CN2011071786W WO2011113341A1 WO 2011113341 A1 WO2011113341 A1 WO 2011113341A1 CN 2011071786 W CN2011071786 W CN 2011071786W WO 2011113341 A1 WO2011113341 A1 WO 2011113341A1
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Prior art keywords
signal
noise
circuit
digital
processing circuit
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PCT/CN2011/071786
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English (en)
French (fr)
Inventor
余承东
单海波
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华为终端有限公司
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Application filed by 华为终端有限公司 filed Critical 华为终端有限公司
Priority to EP11755658.9A priority Critical patent/EP2533504A4/en
Publication of WO2011113341A1 publication Critical patent/WO2011113341A1/zh
Priority to US13/621,973 priority patent/US20130016853A1/en

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17873—General system configurations using a reference signal without an error signal, e.g. pure feedforward
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17855—Methods, e.g. algorithms; Devices for improving speed or power requirements
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17857—Geometric disposition, e.g. placement of microphones
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17885—General system configurations additionally using a desired external signal, e.g. pass-through audio such as music or speech
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/108—Communication systems, e.g. where useful sound is kept and noise is cancelled
    • G10K2210/1081—Earphones, e.g. for telephones, ear protectors or headsets
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • G10L21/0216—Noise filtering characterised by the method used for estimating noise
    • G10L2021/02161—Number of inputs available containing the signal or the noise to be suppressed
    • G10L2021/02165—Two microphones, one receiving mainly the noise signal and the other one mainly the speech signal
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
    • H04M1/6041—Portable telephones adapted for handsfree use
    • H04M1/6058—Portable telephones adapted for handsfree use involving the use of a headset accessory device connected to the portable telephone

Definitions

  • the present invention relates to a noise reduction device, and more particularly to an audio device and a noise reduction mobile phone capable of reducing noise. Background technique
  • the existing active noise canceling earphones on the market include two earpieces, and the earpieces are connected by brackets; each earphone is provided with a microphone for picking up ambient noise; and the earpiece is internally or powered by the bracket.
  • the signal processing module of the earphone processes the background noise, and finally obtains a synchronization signal opposite to the ambient noise, which is transmitted to the user's ear through the earpiece, and the synchronization is performed.
  • the signal and the sound transmitted directly to the user's ear are reduced, and the user can only hear the sound of the music without hearing the outside noise.
  • Embodiments of the present invention provide an audio device and a noise reduction mobile phone capable of reducing noise.
  • An audio device capable of reducing noise, comprising a first signal processing circuit, the first signal processing circuit having two inputs and an output: one input for receiving noise; and the other input for receiving music a digital signal; an output of the first signal processing circuit is coupled to the second signal processing circuit; wherein the first signal processing circuit is configured to generate a noise inversion signal, and the noise inversion signal and the music number The signal is mixed and superimposed to obtain a mixed signal; the second signal processing circuit is configured to perform digital-to-analog conversion and amplification on the mixed signal, and then output to the earphone.
  • a noise canceling mobile phone including a microphone hole for receiving noise; an audio chip for outputting sound
  • the digital signal further includes a first signal processing circuit electrically connected to the microphone hole and the audio chip; and an output of the first signal processing circuit is connected to the second signal processing circuit;
  • the first signal processing circuit is configured to generate a noise inversion signal, and superimpose and superimpose the noise inversion signal and the music digital signal to obtain a mixed signal;
  • the second signal processing circuit is configured to:
  • the mixed signal is digital-to-analog converted and amplified, and output to the earphone.
  • the audio device and the noise reduction mobile phone capable of reducing noise provided by the embodiment of the present invention generate a noise inversion signal by the first signal processing circuit, and superimpose and superimpose the noise inversion signal and the music digital signal to obtain a mixed signal; And performing the digital-to-analog conversion and amplification by the second signal processing circuit, and outputting to the earphone, and the background noise entering the human ear through the earphone and the noise inversion signal in the amplified signal cancel each other, and the sound is heard.
  • the music analog signal that is, "simple and clean” music, does not require the headset itself to carry the power supply and signal processing module, which reduces the cost of the earphone and simplifies the design structure.
  • FIG. 1 is a schematic structural diagram of an audio device capable of reducing noise according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a noise reduction mobile phone according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of an earphone used in conjunction with a noise reduction mobile phone according to an embodiment of the present invention. detailed description
  • an audio device capable of reducing noise includes a first signal processing circuit 1 having two inputs and an output: one input for receiving The other is for receiving a music digital signal; the second signal processing circuit 2 is connected to the output of the first signal processing circuit 1.
  • the input end of the first signal processing circuit 1 can be connected to a microphone, and the microphone receives background noise, that is, receives background noise, and amplifies the background noise, and inputs it to the first signal processing circuit 1; the first signal processing circuit 1 outputs a noise analog signal.
  • the music digital signal is input to the first signal processing circuit 1; the first signal processing circuit 1 is also used for Mixing the noise inversion signal and the music digital signal to obtain a mixed signal; the second signal processing circuit 2 performs digital-to-analog conversion and amplification on the mixed signal, and outputs the amplified signal to the earphone, and the amplified signal enters the human ear through the earphone; The background noise and the noise inversion signal in the amplified signal cancel each other out, and the music analog signal, that is, the "simple clean" music is heard.
  • the first signal processing circuit 1 includes an analog to digital conversion circuit, a noise inversion circuit, and a hybrid superposition circuit, and the analog to digital conversion circuit is coupled to the noise inversion circuit.
  • the noise is an analog signal, which is converted into a noisy digital signal by an analog-to-digital conversion circuit;
  • a noise inverting circuit for generating a noise inverting signal that is opposite in phase to the amplitude of the noise digital signal.
  • the hybrid superposition circuit is electrically connected to the noise inversion circuit for mixing and superimposing the received music digital signal and the noise inversion signal.
  • the second signal processing circuit 2 includes a digital-to-analog conversion circuit and a signal amplification circuit, and the digital-to-analog conversion circuit converts the mixed digital signal of the noise inversion signal and the music digital signal into an analog mixed signal; the signal amplifying circuit is used to amplify the analog mixing The signal, and the amplified analog signal mixed signal is output to the earphone, of course, the earphone here only needs to have the earphone with the earpiece.
  • an audio device capable of reducing noise
  • a noise inversion signal is generated by the first signal processing circuit, and the noise inversion signal is mixed with a music digital signal to obtain a mixed signal
  • the second signal processing circuit is configured to perform digital-to-analog conversion and amplification of the mixed signal, and then output to the earphone, and enter the background noise and the amplified letter of the human ear through the earphone.
  • the noise inversion signals in the number cancel each other out, and the music analog signal, that is, the "simple and clean" music is heard, so that the earphone itself does not need to carry the power supply and the signal processing module, thereby reducing the cost of the earphone and simplifying the design structure. . That is to say, only the earphone needs to receive the amplified signal, and the earphone itself does not need to carry the power supply and the signal processing module.
  • the first signal processing circuit and the second signal processing circuit may be powered, so that when the user needs to listen to music, only the earphone with the earpiece needs to be inserted into the earphone hole of the mobile phone to listen. Music, you can hear the music of "simple clean", so that the headset itself does not need to carry additional power supply, which can reduce the cost, and also simplify the design of the earphone in the prior art.
  • the audio device capable of reducing noise in the embodiment of the present invention can be set or built in other terminals that can play music, such as a desktop, a notebook, a PDA, and the like.
  • a mobile phone is taken as an example for description.
  • An audio device capable of reducing noise according to an embodiment of the present invention can be assembled into an existing mobile phone to achieve clear reception of signals.
  • the assembled phone structure is as follows:
  • the noise reduction mobile phone of the embodiment of the present invention is provided with a microphone hole for receiving noise of an external environment; an audio chip 3 for outputting a music digital signal; and the microphone hole and the audio chip 3 respectively and the first
  • the input terminal of the signal processing circuit 1 is electrically connected; the output of the first signal processing circuit 1 is connected to the second signal processing circuit 2.
  • the first signal processing circuit 1 converts the noise analog signal into a noise digital signal, and generates a noise inverted signal whose amplitude is opposite to the noise phase; when the user listens to the music, the audio chip 3 inputs the music digital signal to the first signal processing.
  • the first signal processing circuit 1 mixes and superimposes the noise inversion signal and the music digital signal to obtain a mixed signal; and the second signal processing circuit 2 performs digital-to-analog conversion and amplification on the mixed signal.
  • the mobile phone further has a headphone hole, and the earphone can be connected.
  • the amplified signal of the second signal processing circuit 2 enters the human ear; the background noise entering the human ear and the noise in the amplified signal are reversed.
  • the signals cancel each other out, What you hear is the music analog signal, which is "simple and clean" music.
  • the first signal processing circuit 1 includes an analog to digital conversion circuit, a noise inversion circuit and a hybrid superposition circuit, the analog to digital conversion circuit is connected to the noise inversion circuit; and the analog to digital conversion circuit is configured to convert the noise analog signal into a noise figure
  • the analog-to-digital conversion circuit is connected with a noise inverting circuit for generating a noise inversion signal whose amplitude is opposite to the noise phase.
  • the hybrid superposition circuit is electrically connected to the noise inversion circuit for mixing and superimposing the received music digital signal and the noise inversion signal.
  • the second signal processing circuit 2 includes a digital to analog conversion circuit for converting a mixed digital signal of a noise inversion signal and a music digital signal into an analog mixed signal, and a signal amplifying circuit for amplifying the analog mixed signal.
  • the first signal processing circuit and the second signal processing circuit are disposed such that when the user needs to listen to music, only the earphone with the earpiece needs to be inserted into the earphone hole of the mobile phone to listen to music, and then the user can listen.
  • the music is "simple and clean", so that the earphone itself does not need to carry an additional power supply, thereby reducing the cost, and simplifying the design of the earphone in the prior art.
  • the earphone 4 with a microphone as shown in FIG. 3 can also be used, and the earphone 4 is connected with a microphone 5 through a wire, and the microphone 5 is connected with a plug 7 through a wire, and the microphone 5 is connected with A positioning clip 6 is placed on the wire between the plugs 7; the positioning clip 6 can be clamped at the position of the collar; the plug 7 is used in conjunction with the microphone hole.
  • the microphone 5 can receive noise from the outside environment and is provided to the first signal processing circuit in the handset.
  • An audio device capable of reducing noise in an embodiment of the present invention can be applied to any audio playback device using a headphone or a headphone, such as a desktop computer or a notebook.

Description

能够降低噪音的音频装置和降噪手机 技术领域 本发明涉及降噪装置， 尤其涉及能够降低噪音的音频装置和降噪手机。 背景技术
随着手机多媒体功能的逐渐强大， 音乐手机的概念全面推广， 用户对手 机音乐的要求也越来越高， 多数用户耳机体验音乐的同时又能够不受外界嘈 杂环境的干扰， 目前业界有推出一些相关的降噪耳机， 现有市面上的主动降 噪耳机包括两个听筒， 听筒之间通过支架连接； 每个听筒上都设有一个麦克 风用于拾取环境噪音； 听筒内部或者支架上设有供电系统、 A/D、 DSP处理模 块、 D/A转换模块。 在用户体验音乐的时候， 麦克风拾取背景噪声环境后， 耳 机的信号处理模块会对背景噪声进行处理， 最终得到一个和周围环境噪音反 相位的同步信号， 通过听筒传送至用户耳朵里， 该同步信号和直接传送到用 户耳朵里的声音相互消减， 用户就只能听到音乐的声音而不会听到外界的噪 音。
现有的降噪耳机需要自带供电电源和信号处理模块， 成本很高。 发明内容
本发明实施例提供一种能够降低噪音的音频装置和降噪手机。
为达到上述目的， 采用如下技术方案：
一种能够降低噪音的音频装置， 包括第一信号处理电路， 所述第一信号 处理电路置有两个输入端和一个输出端： 一个输入端用于接收噪音； 另一个 输入端用于接收音乐数字信号； 所述第一信号处理电路的输出端连接有第二 信号处理电路； 其中， 所述第一信号处理电路， 用于产生噪音反相信号，并将 所述噪音反相信号与音乐数字信号混合叠加， 得到混合信号； 所述第二信号 处理电路， 用于将所述混合信号进行数模转换及放大后， 输出至耳机。
一种降噪手机， 包括麦克风孔， 用于接收噪音； 音频芯片， 用于输出音 乐数字信号， 还包括第一信号处理电路， 与所述麦克风孔和音频芯片电连接； 第一信号处理电路的输出端连接有第二信号处理电路；
其中， 所述第一信号处理电路， 用于产生噪音反相信号，并将所述噪音反 相信号与音乐数字信号混合叠加， 得到混合信号； 所述第二信号处理电路， 用于将所述混合信号进行数模转换及放大后， 输出至耳机。
本发明实施例提供的能够降低噪音的音频装置和降噪手机， 通过所述第 一信号处理电路产生噪音反相信号，并将所述噪音反相信号与音乐数字信号 混合叠加， 得到混合信号； 并通过第二信号处理电路将所述混合信号进行数 模转换及放大后， 输出至耳机， 通过耳机进入人耳的背景噪音与放大后的信 号中的噪音反相信号相互抵消， 收听到的就是音乐模拟信号， 即 "单純干净" 的音乐， 从而不需要耳机本身携带供电电源和信号处理模块， 降低了耳机的 成本， 简化了设计结构。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案， 下面将对实 施例或现有技术描述中所需要使用的附图作简单地介绍， 显而易见地， 下面 描述中的附图仅仅是本发明的一些实施例， 对于本领域普通技术人员来讲， 在不付出创造性劳动性的前提下， 还可以根据这些附图获得其他的附图。
图 1为本发明实施例能够降低噪音的音频装置的结构示意图；
图 2为本发明实施例降噪手机的结构示意图；
图 3为与本发明实施例降噪手机配合使用的耳机的结构示意图。 具体实施方式
下面结合附图对本发明实施例能够降低噪音的音频装置和降噪手机进行 详细描述。
如图 1所示， 一种能够降低噪音的音频装置， 包括第一信号处理电路 1， 该第一信号处理电路 1 置有两个输入端和一个输出端： 一个输入端用于接收 噪音； 另一个用于接收音乐数字信号； 第一信号处理电路 1 的输出端连接有 第二信号处理电路 2。
第一信号处理电路 1的输入端可以与麦克风连接， 麦克风接收背景噪声， 即接收背景噪音， 并将背景噪音放大后， 输入给第一信号处理电路 1 ; 第一信 号处理电路 1 将噪音模拟信号转换成噪音数字信号， 并产生与噪音数字信号 相位相反， 幅度匹配的噪音反相信号； 当用户收听音乐时， 音乐数字信号输 入给第一信号处理电路 1 ;第一信号处理电路 1还用于将噪音反相信号与音乐 数字信号混合叠加， 得到混合信号； 第二信号处理电路 2 将混合信号进行数 模转换及放大后输出至耳机， 放大后的信号通过耳机进入人耳； 进入人耳的 背景噪音与放大后的信号中的噪音反相信号相互抵消， 收听到的就是音乐模 拟信号， 即 "单純干净" 的音乐。
所述第一信号处理电路 1 包括模数转换电路、 噪音取反电路和混合叠加 电路， 所述模数转换电路连接该噪音取反电路。
噪音是模拟信号， 模数转换电路将其转换成噪音数字信号；
噪音取反电路， 用于产生与噪音数字信号相位相反， 幅度匹配的噪音反 相信号。
混合叠加电路， 与该噪音取反电路电连接， 用于将接收的音乐数字信号 与噪音反相信号进行混合叠加。
所述第二信号处理电路 2 包括数模转换电路和信号放大电路， 数模转换 电路将噪音反相信号和音乐数字信号的混合数字信号转换为模拟混合信号； 信号放大电路， 用于放大模拟混合信号， 并将放大后的模拟信号混合信号输 出至耳机， 当然此处的耳机为只需要将带有听筒的耳机即可。
在本发明实施例中， 提供的能够降低噪音的音频装置， 通过所述第一信 号处理电路产生噪音反相信号，并将所述噪音反相信号与音乐数字信号混合 叠加， 得到混合信号； 所述第二信号处理电路， 用于将所述混合信号进行数 模转换及放大后， 输出至耳机， 通过耳机进入人耳的背景噪音与放大后的信 号中的噪音反相信号相互抵消， 收听到的就是音乐模拟信号， 即 "单純干净" 的音乐， 从而不需要耳机本身携带供电电源和信号处理模块， 降低了耳机的 成本， 简化了设计结构。 也就是说， 只需要耳机接收放大后的信号即可， 不 需要耳机本身携带供电电源和信号处理模块。
在本发明实施例中， 可以将包括第一信号处理电路、 第二信号处理电路 路进行供电， 从而使得当用户需要听音乐时， 只需要将带有听筒的耳机插入 手机的耳机孔中进行听音乐， 就可以听到 "单純干净" 的音乐， 从而使得耳 机本身不需要再携带额外的供电电源， 从而可以减少成本， 而且还简化了现 有技术中的耳机的设计。
当然， 本发明实施例中的能够降低噪音的音频装置可以设置或内置于其 它可以播放音乐的终端中， 比如， 台式机， 笔记本， PDA等等。 在本发明实施 例中， 以手机为例进行说明。
对现有手机进行改进： 将本发明实施例能够降低噪音的音频装置， 组装 进现有手机， 就可以实现清楚接收信号的目的。
组装后的手机结构如下：
如图 2 所示， 本发明实施例降噪手机设置有麦克风孔， 用于接收外界环 境的噪音； 音频芯片 3， 用于输出音乐数字信号； 与所述麦克风孔和音频芯片 3分别与第一信号处理电路 1的输入端电连接；第一信号处理电路 1的输出端 连接有第二信号处理电路 2。第一信号处理电路 1将噪音模拟信号转换成噪音 数字信号， 并产生与噪音相位相反， 幅度匹配的噪音反相信号； 当用户收听 音乐时， 音频芯片 3将音乐数字信号输入给第一信号处理电路 1 ; 第一信号处 理电路 1 将噪音反相信号与音乐数字信号进行混合叠加， 得到混合信号； 第 二信号处理电路 2 将混合信号进行数模转换及放大。 该手机另设有耳机孔， 可以连接有耳机， 当有耳机插入手机时， 第二信号处理电路 2放大后的信号 进入人耳； 进入人耳的背景噪音与放大后的信号中的噪音反相信号相互抵消， 收听到的就是音乐模拟信号， 即 "单純干净" 的音乐。
所述第一信号处理电路 1 包括模数转换电路、 噪音取反电路和混合叠加 电路， 所述模数转换电路连接该噪音取反电路； 模数转换电路用于将噪音模 拟信号转换成噪音数字信号； 所述模数转换电路连接有噪音取反电路， 用于 产生与噪音相位相反， 幅度匹配的噪音反相信号。 混合叠加电路与该噪音取 反电路电连接， 用于将接收的音乐数字信号与噪音反相信号进行混合叠加。
所述第二信号处理电路 2 包括数模转换电路， 用于将噪音反相信号和音 乐数字信号的混合数字信号转换为模拟混合信号； 信号放大电路， 用于放大 模拟混合信号。
在本发明实施例中， 由于第一信号处理电路、 第二信号处理电路设置于 使得当用户需要听音乐时， 只需要将带有听筒的耳机插入手机的耳机孔中进 行听音乐， 就可以听到 "单純干净" 的音乐， 从而使得耳机本身不需要再携 带额外的供电电源， 从而可以减少成本， 而且还简化了现有技术中的耳机的 设计。
本发明实施例降噪手机， 也可以使用如图 3所示的带有麦克风的耳机 4， 所述耳机 4通过导线连接有麦克风 5， 该麦克风 5通过导线连接有插头 7， 所 述麦克风 5与插头 7之间的导线上置有定位夹 6;可以将定位夹 6夹持在衣领 的位置； 该插头 7与所述麦克风孔配合使用。 麦克风 5可以接收外界环境的 噪音， 提供给手机中的第一信号处理电路。
本发明实施例能够降低噪音的音频装置， 可以应用到任何使用头戴耳机 或耳机的音频播放装置， 如台式计算机、 笔记本。
上述具体实施例并不用以限制本发明， 对于本技术领域的普通技术人员 来说， 凡在不脱离本发明原理的前提下， 所作的任何修改、 等同替换、 改进 等， 均应包含在本发明的保护范围之内。

Claims

权利要求 书
1、 一种能够降低噪音的音频装置， 其特征在于， 包括第一信号处理电路， 所述第一信号处理电路置有两个输入端和一个输出端： 一个输入端用于接收噪 音； 另一个输入端用于接收音乐数字信号； 所述第一信号处理电路的输出端连 接有第二信号处理电路； 其中， 所述第一信号处理电路， 用于产生噪音反相信 号，并将所述噪音反相信号与音乐数字信号混合叠加， 得到混合信号； 所述第二 信号处理电路， 用于将所述混合信号进行数模转换及放大后， 输出至耳机。
2、 根据权利要求 1所述的能够降低噪音的音频装置， 其特征在于， 所述第 一信号处理电路包括模数转换电路、 噪音取反电路和混合叠加电路；
所述模数转换电路用于将噪音模拟信号转换成噪音数字信号；
所述噪音取反电路， 与所述模数转换电路连接， 用于产生与所述噪音数字 信号相位相反， 幅度匹配的噪音反相信号；
所述混合叠加电路， 与所述噪音取反电路电连接， 用于将接收的音乐数字 信号与噪音反相信号进行混合叠加。
3、 根据权利要求 1所述的能够降低噪音的音频装置， 其特征在于， 所述第 二信号处理电路包括数模转换电路及信号放大电路；
所述数模转换电路用于将所述噪音反相信号和所述音乐数字信号的混合数 字信号转换为模拟混合信号；
所述信号放大电路用于放大所述模拟混合信号， 并输出至耳机。
4、 一种降噪手机， 包括麦克风孔， 用于接收噪音； 音频芯片， 用于输出音 乐数字信号， 其特征在于， 还包括第一信号处理电路， 与所述麦克风孔和音频 芯片电连接； 第一信号处理电路的输出端连接有第二信号处理电路；
其中， 所述第一信号处理电路， 用于产生噪音反相信号，并将所述噪音反相 信号与音乐数字信号混合叠加， 得到混合信号； 所述第二信号处理电路， 用于 将所述混合信号进行数模转换及放大后， 输出至耳机。
5、 根据权利要求 4所述的降噪手机， 其特征在于， 所述耳机通过导线连接 有麦克风， 所述麦克风通过导线连接有插头， 所述麦克风通过插头与所述手机 连接， 所述麦克风用于为所述手机提供噪音。
6、 根据权利要求 4所述的降噪手机， 其特征在于， 所述第一信号处理电路 包括模数转换电路、 噪音取反电路和混合叠加电路； 所述模数转换电路用于将噪音模拟信号转换成噪音数字信号； 所述噪音取反电路， 与所述模数转换电路连接， 用于产生与所述噪音数字 信号相位相反， 幅度匹配的噪音反相信号； 所述混合叠加电路， 与所述噪音取反电路电连接， 用于将接收的音乐数字 信号与噪音反相信号进行混合叠加。
7、 根据权利要求 4所述的降噪手机， 其特征在于， 所述第二信号处理电路 包括数模转换电路及信号放大电路； 所述数模转换电路用于将所述噪音反相信号和所述音乐数字信号的混合数 字信号转换为模拟混合信号；
所述信号放大电路用于放大所述模拟混合信号， 并输出至耳机。
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