WO2017215237A1 - 用于耳机耳塞的3d音效处理电路及其处理方法 - Google Patents

用于耳机耳塞的3d音效处理电路及其处理方法 Download PDF

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Publication number
WO2017215237A1
WO2017215237A1 PCT/CN2016/112503 CN2016112503W WO2017215237A1 WO 2017215237 A1 WO2017215237 A1 WO 2017215237A1 CN 2016112503 W CN2016112503 W CN 2016112503W WO 2017215237 A1 WO2017215237 A1 WO 2017215237A1
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Prior art keywords
earphone
sound
sound effect
circuit
audio signal
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PCT/CN2016/112503
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English (en)
French (fr)
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吴世杰
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深圳奥尼电子股份有限公司
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Publication of WO2017215237A1 publication Critical patent/WO2017215237A1/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
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • 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
    • H04R1/1091—Details not provided for in groups H04R1/1008 - H04R1/1083
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2430/00—Signal processing covered by H04R, not provided for in its groups

Definitions

  • the present invention relates to a sound effect processing circuit, and more particularly to a 3D sound effect processing circuit for earphone earphones and a processing method thereof.
  • earphones and earplugs can only be provided with a single sounding device due to their small size. Such a structure makes it impossible to release the effect of 3D sound effects.
  • the object of the present invention is to overcome the deficiencies of the prior art and to provide a 3D sound processing circuit for earphone earplugs and a processing method thereof.
  • the present invention adopts the following technical solutions:
  • a 3D sound processing circuit for earphone earphones comprising an input interface for an external audio signal, an AD conversion module connected to the input interface, a sound effect processor connected to the AD conversion module, a power amplifier circuit connected to the sound effect processor, and An output interface for outputting a 3D sound effect audio signal connected to the power amplifier circuit;
  • the input interface and the output interface each include a left channel signal line and a right channel signal line;
  • the AD conversion module converts the analog audio signal into The digital signal is transmitted to the sound effect processor;
  • the sound effect processor generates a plurality of sets of audio signals having different frequency bands and having a time difference according to the received digital audio signals of the left channel and the right channel, and superimposing the left channel, The right channel two analog audio signal output port outputs;
  • the power amplifier circuit power-amplifies the analog audio signal output by the sound processor, and outputs the output to the output interface.
  • the further technical solution is as follows: an input filter circuit and an isolation circuit connected between the input interface and the AD conversion module; and an output filter circuit connected between the power amplifier circuit and the output interface.
  • the sound effect switching circuit is further connected between the input filter circuit, the output filter circuit and the power amplifier circuit.
  • the sound effect switching circuit works, the power amplifier circuit and the output filter circuit are connected, and the output is
  • the audio signal processed by the sound processor has a 3D sound effect; when the sound effect switching circuit is not working, the signal of the input filter circuit is in communication with the output filter circuit, and the output is the original audio signal of the input interface.
  • a further technical solution is: further comprising a memory connected to the sound processor, wherein the memory stores an audio file, and the sound effect processor converts the audio file into an analog audio signal and outputs the signal to the power amplifier circuit.
  • a further technical solution is: further comprising an indicator light and a control button connected to the sound effect processor, wherein the indicator light comprises an operating status light and a working mode light; the control button comprises an opening key and a function for starting or shutting down The mode key for selecting the sound mode; the sound effect processor is a DSP processor.
  • the further technical solution is as follows: further comprising a power module connected to the sound processor, and a battery and a USB interface connected to the power module, and a filter chip for upgrading is further connected between the USB interface and the sound effect processor.
  • the power module includes a charging and discharging management circuit connected to the battery, a step-down circuit connected to the sound processor, and a power switching circuit for switching the external power source and the internal battery power, converting the 5V power into A 3.3V power conversion circuit and a power switch circuit for turning off the local power supply.
  • the invention relates to a 3D sound processing method for earphone earplugs, which is characterized in that after an audio signal is AD-converted, it is input to a sound effect processor, and the sound effect processor generates a plurality of groups according to the received digital audio signals of the left channel and the right channel.
  • the audio signals with different frequency bands and time difference are outputted in the superimposed manner through the two analog audio signal output ports of the left channel and the right channel; and then amplified by power, and output to the sounding device of the earphone or the earphone.
  • the plurality of sets of frequency bands having different time bands and having a time difference include at least a center audio signal generated based on a center sound source located directly in front of the listener, and generating a left front sound source based on a left front position of the listener.
  • the left front audio signal, the right front audio signal generated based on the right front sound source at the right front position of the listener, the left rear audio signal generated based on the left rear sound source at the left rear position of the listener, and the right rear sound source based on the right rear position of the listener The generated right rear audio signal, and when these four audio signals are output to the left earphone/left earphone, right earphone/right earphone, there is a time difference of 0.01-0.6 ms.
  • a further technical solution is: when the head of the user equipped with the earphone or the earplug changes, the time difference between the left channel and the right channel is switched by the provided sensor to adapt to the movement angle of the user's head; or When the user with the earphone is walking, the speed of walking is detected by the provided sensor, and the sound effect processor simulates the audio signal received by the left and right ears of the human body in the walking state, and outputs the pronunciation to the earphone or the earphone. Device.
  • the invention has the beneficial effects that the sound effect processing circuit of the present invention uses a sound effect processor to generate a plurality of sets of audio signals of different frequency bands generated based on analog sound sources of different positions of the listener for the original audio signal, and
  • the 3D sound effects of the 3D surround sound can be simulated by superimposing the two left and right sounding devices of the earphone earphones.
  • FIG. 1 is a circuit block diagram of a specific embodiment of a 3D sound processing circuit for earphone earphones of the present invention
  • FIG. 2 is a first schematic diagram of a circuit schematic diagram (including a sound effect processor, a control button, an indicator light, and a memory) of a specific embodiment of a 3D sound processing circuit for a headphone earphone of the present invention
  • FIG. 3 is a second schematic diagram of a circuit schematic diagram of a 3D sound effect processing circuit for a headphone earphone according to the present invention (including an input interface, an input filter circuit, an isolation circuit, a sound effect switching circuit, an AD conversion module, an output filter circuit, and an output interface). );
  • FIG. 4 is a third schematic diagram of a circuit schematic diagram (including a power module, a battery, and a USB interface) of a specific embodiment of a 3D sound processing circuit for an earphone earphone of the present invention
  • FIG. 5 is a schematic diagram of an analog sound source for a 3D sound effect processing method for earphone earphones according to the present invention.
  • the 3D sound processing circuit for earphone earphones of the present invention comprises an input interface 10 for external audio signals, an AD conversion module 20 connected to the input interface 10, and an audio processor connected to the AD conversion module 20. 30, a power amplifier circuit 40 connected to the sound effect processor 30, and an output interface 50 connected to the power amplifier circuit 40 for outputting a 3D sound effect audio signal; the input interface 10 and the output interface 50 each include a left channel signal line and a right channel.
  • the AD conversion module 20 converts the analog audio signal into a digital signal for transmission to the sound effect processor 30; the sound effect processor 30 pairs the received left and right channels
  • the digital audio signal is subjected to high frequency intermediate frequency low frequency processing, and/or after delay processing between the two channels, and is output as an analog signal; the power amplifier circuit 40 performs power amplification on the analog audio signal output from the sound effect processor 30. And output to the output interface 50.
  • the input filter circuit 11 and the isolation circuit 12 connected between the input interface 10 and the AD conversion module 20 are further included; and an output filter circuit 51 connected between the power amplifier circuit 40 and the output interface 50.
  • the sound effect switching circuit 60 is further connected between the input filter circuit 11, the output filter circuit 51 and the power amplifier circuit 40.
  • the power amplifier circuit 40 is connected to the output filter circuit 51, and the output is The audio signal having the 3D sound effect processed by the sound effect processor 30; when the sound effect switching circuit 60 is not in operation, the signal of the input filter circuit 11 is in communication with the output filter circuit 51, and the original audio signal of the input interface 10 is output.
  • a memory 31 connected to the sound effect processor 30.
  • the memory 31 stores an audio file, and the sound effect processor 30 can convert the audio file into an analog audio signal and output it to the power amplifier circuit 40. At this time, the sound effect processor is equivalent to having a 3D sound effect. MP3 player.
  • the memory 31 can also be used to store other files, such as control program files.
  • an indicator light 32 and a control button 33 coupled to the sound effect processor 30, the indicator light 32 including an operational status light and an operational mode light; the control button 33 includes an on-off key for powering on or off and a mode key for selecting a sound effect mode .
  • the working mode can be at least three, high frequency processing, intermediate frequency processing and low frequency processing. Or according to the scene of the user, there are at least three types, closed space type, square type, and aisle type (or called culvert type).
  • the power module 70 connected to the sound processor 30 and the battery 71 and the USB interface 72 connected to the power module 70 are further connected, and a filter chip 73 for upgrading is further connected between the USB interface 72 and the sound effect processor 30.
  • the audio input interfaces are GNDN, LIN, RIN, and MIC.
  • the input filter circuit includes L13, L14, L15, L17, C47, C48, C55, C56, C57, and R36, R37. It is connected to the COM1 and COM2 pins of LIN9 [2] and RIN[2] and U8 (ie, SGM3002 chip, isolation circuit), and is connected to the NC1 and NC2 pins of U9 (ie, SGM3717 chip, audio switching circuit).
  • the audio output interfaces LO and RO are connected to the COM1 and COM2 pins of U9 (ie, SGM3717 chip, audio switching circuit) via L20 and L21 (ie, output filter circuit, including C49 and C50).
  • the NO1 and NO2 pins of U8 ie, SGM3002 chip, isolation circuit
  • U5 ie, AD1370 chip, AD conversion module
  • U5 transmits the digitized audio signal to U1 (ie, M3802 microcontroller chip, audio processor) for audio processing.
  • the sound processor uses the M3802 microcontroller chip (a DSP processor chip), which is equipped with a filter circuit composed of C41-C43, a battery voltage detection circuit composed of R25, R26 and C39, and A clock circuit composed of R30, C32, and C33.
  • the memory is U5 (ie EN25Q16 chip).
  • the power module includes a charge and discharge management circuit (ie, U2, 4054 chip) connected to the battery (ie, BAT), and a step-down circuit U10 (LP3220 chip) connected to the sound effect processor U1 for switching.
  • External power supply and internal battery power supply switching circuit Q1 ie field effect transistor, SI2301 type
  • convert 5V power to 3.3V power conversion circuit U3 ie voltage conversion chip, LP3986 type
  • for turning off local power supply Power switch circuit Q2 ie field effect tube, SI2301 type
  • the filter chip is a CMF2012 chip, which is connected between the USB interface and the sound effect processor, and is an upgrade interface of the sound effect processor.
  • the input interface is an audio plug and the output interface is an audio jack. Since the recording signal does not require audio processing, the input interface and the MIC pickup terminal of the output interface are directly connected.
  • the sound switching circuit may not be used, and only the 3D sound processing mode may be adopted, and the working mode of the original audio is not directly output.
  • the above devices may also be of other types.
  • a slot for an external memory card can also be provided to store a larger capacity audio file.
  • the invention relates to a 3D sound processing method for earphone earplugs, which is characterized in that after an audio signal is AD-converted, it is input to a sound effect processor, and the sound effect processor generates a plurality of groups according to the received digital audio signals of the left channel and the right channel.
  • the audio signals with different frequency bands and time difference are outputted in the superimposed manner through the two analog audio signal output ports of the left channel and the right channel; and then amplified by power, and output to the sounding device of the earphone or the earphone.
  • the audio signals in which the plurality of sets of frequency bands are different and the time difference difference includes the center audio signals AL, AR generated based on the center sound source 8A located directly in front of the listener, and the left front sound based on the left front position of the listener
  • Each of the sound sources is an analog sound source generated by the sound effect processor based on the set parameters based on a plurality of distances of the listener (ie, headphones or earplugs), and generates a plurality of sets of audio signals based on the analog sound sources.
  • the audio signals AL, BL, CL, DL, EL, FL are output to the left channel (ie, the left earphone or the left earphone) in a superimposed manner.
  • the audio signals AR, BR, CR, DR, ER, FR are output to the right channel (ie, the right earphone or the right earphone) in a superimposed manner.
  • the audio signals AL and AR use a high frequency sound source (ie, a high audio segment), and the audio signals BL, CL, DL, and EL.
  • BR, CR, DR, ER use the intermediate frequency sound source (ie, the middle audio segment), and make the frequency bands of the front and rear positions different, so that the user can recognize that the simulated sound sources are from the front or the rear.
  • a bass sound source 8G based on the right front of the listener, and at the output, an audio signal generated based on the bass sound source 8F and/or the bass sound source 8G can be used.
  • the time difference between the left channel and the right channel is switched by the sensor provided to adapt to the head movement angle of the user; or
  • the speed of walking is detected by the provided sensor, and the sound effect processor simulates the audio signal received by the left and right ears of the human body in the walking state, and outputs the pronunciation to the earphone or the earphone.
  • the sound effect processor simulates the audio signal received by the left and right ears of the human body in the walking state, and outputs the pronunciation to the earphone or the earphone.
  • a GPS module may be added to obtain a position where the user is located through the GPS module, thereby automatically switching the working mode, such as in a closed space type, a square type, and an aisle type (or called a culvert). Switch between types).
  • This allows the user to change the 3D sound in real time and match the position of the headset or earbuds. For example, when the user passes through the intersection, the sound processor can turn off the audio output of the incoming direction (the first half of the intersection closes the left channel, and the second half of the intersection closes the right channel) to receive it.
  • the car vehicle sounds in the direction of the car to improve the safety through the intersection.
  • a timing module may be added to switch the 3D sound mode that the user exceeds the set time, or turn off the 3D sound mode, so that the user's ear jumps out from a certain fixed mode, and reduces A sense of fatigue in a fixed mode.
  • the size of the earphone earphones In order to reflect the 3D sound effect, the size of the earphone earphones must have certain requirements, and the optimal size is between 10-13 mm in diameter.
  • the sound effect processing circuit of the present invention uses a sound effect processor to generate a plurality of sets of audio signals of different frequency bands generated based on analog sound sources of different positions of the listener for the original audio signal, and to pass through the earphone earphones in a superimposed manner.
  • the two pronunciation devices are played out to simulate the 3D sound effects of the 3D surround sound.

Abstract

本发明公开了一种用于耳机耳塞的3D音效处理电路及其处理方法。用于耳机耳塞的3D音效处理电路包括用于外接音频信号的输入接口，与输入接口连接的AD转换模块，音效处理器，功放电路，及输出接口；输入接口、输出接口均包括左声道信号线和右声道信号线；AD转换模块将模拟的音频信号转换为数字信号传输至音效处理器；音效处理器根据接收到的左声道和右声道的数字音频信号生成多组频段不同并且存在时间差的音频信号，以叠加的方式经左声道、右声道二个模拟音频信号输出端口输出；功放电路对模拟音频信号进行功率放大之后输出至输出接口。本发明对原始的音频信号转换为多个音频信号，以叠加方式通过二个声道的播放出来，进而通过耳机耳塞的左右二个发音器件播放出具有3D效果的音频。

Description

用于耳机耳塞的3D音效处理电路及其处理方法
技术领域
本发明涉及一种音效处理电路，更具体地说是指用于耳机耳塞的3D音效处理电路及其处理方法。
背景技术
现有技术中，耳机和耳塞由于体积小，只能设有单一的发音器件。这样的结构，使得其无法放出3D音效的效果。
随着人们的移动设备增加，人们在工作和生活中的移动距离也在增大。人们更有更多的机会通过耳机耳塞来收听数字媒体的音频信号。
因此，有必要开发出一种用于耳机耳塞的3D音效处理电路及其处理方法，以提高人们在使用耳机耳塞的音频效果，增加体验感。
发明内容
本发明的目的在于克服现有技术的缺陷，提供一种用于耳机耳塞的3D音效处理电路及其处理方法。
为实现上述目的，本发明采用以下技术方案：
用于耳机耳塞的3D音效处理电路，包括用于外接音频信号的输入接口，与输入接口连接的AD转换模块，与AD转换模块连接的音效处理器，与音效处理器连接的功放电路，及与功放电路连接的用于输出3D音效音频信号的输出接口；所述的输入接口、输出接口均包括左声道信号线和右声道信号线；所述的AD转换模块将模拟的音频信号转换为数字信号传输至音效处理器；所述的音效处理器根据接收到的左声道和右声道的数字音频信号生成多组频段不同并且存在时间差的音频信号，以叠加的方式经左声道、右声道二个模拟音频信号输出端口输出；所述的功放电路对音效处理器输出的模拟音频信号进行功率放大之后，输出至输出接口。
其进一步技术方案为：还包括连接于输入接口与AD转换模块之间的输入滤波电路和隔离电路；及连接于功放电路与输出接口之间的输出滤波电路。
其进一步技术方案为：还包括连接于输入滤波电路、输出滤波电路和功放电路三者之间的音效切换电路，当音效切换电路工作时，功放电路与输出滤波电路相通，此时输出的为经过音效处理器加工过的具有3D音效的音频信号；当音效切换电路不工作时，输入滤波电路的信号与输出滤波电路相通，输出的为输入接口的原始音频信号。
其进一步技术方案为：还包括与音效处理器连接的存储器，所述的存储器存储有音频文件，所述的音效处理器将音频文件转换为模拟的音频信号输出至功放电路。
其进一步技术方案为：还包括与音效处理器连接的指示灯和控制按钮，所述的指示灯包括工作状态灯和工作模式灯；所述的控制按钮包括用于开机或关机的开关键和用于选择音效模式的模式键；所述的音效处理器为DSP处理器。
其进一步技术方案为：还包括与音效处理器连接的电源模块，及与电源模块连接的电池和USB接口，所述的USB接口与音效处理器之间还连接有用于升级的滤波芯片。
其进一步技术方案为：所述的电源模块包括与电池连接的充放电管理电路，与音效处理器连接的降压电路，用于切换外部电源与内部电池电源的电源切换电路，将5V电源转换为3.3V的电源转换电路，及用于关闭局部电源的电源开关电路。
本发明用于耳机耳塞的3D音效处理方法，该方法是将音频信号经过AD转换之后，输入至音效处理器，音效处理器根据接收到的左声道和右声道的数字音频信号生成多组频段不同并且存在时间差的音频信号，再以叠加的方式经左声道、右声道二个模拟音频信号输出端口输出；再经过功率放大，输出至耳机或耳塞的发音器件。
其进一步技术方案为：所述的多组频段不同并且存在时间差的音频信号至少包括基于听者正前方位置的中置声源生成的中置音频信号，基于听者左前方位置的左前声源生成的左前音频信号，基于听者右前方位置的右前声源生成的右前音频信号，基于听者左后方位置的左后声源生成的左后音频信号和基于听者右后方位置的右后声源生成的右后音频信号，且这四种音频信号输出至左耳塞/左耳机、右耳塞/右耳机时，存在0.01-0.6ms的时间差。
其进一步技术方案为：当配带耳机或耳塞的使用者的头部发生变化时，通过设有的传感器，切换左声道与右声道的时间差，以适应使用者的头部移动角度；或者，当配带耳机的使用者在行走时，通过设有的传感器，检测到行走的速度，音效处理器仿真人体左右耳朵在该行走状态时接收到的音频信号，并输出至耳机或耳塞的发音器件。
本发明与现有技术相比的有益效果是：本发明音效处理电路采用音效处理器，对原始的音频信号生成多组基于听者不同位置的模拟声源而生成的不同频段的音频信号，并以叠加方式通过耳机耳塞的左右二个发音器件播放出来，可以模拟出来3D环绕音响所具有的3D音效。大大地改善了使用者的体验感。还可以通过传感器的检测，或者内置定时电路的方式，对3D音频进行相对应的改变。以改善长期使用耳机耳塞对耳朵造成的疲劳感。
下面结合附图和具体实施例对本发明作进一步描述。
附图说明
图1为本发明用于耳机耳塞的3D音效处理电路具体实施例的电路方框图；
图2为本发明用于耳机耳塞的3D音效处理电路具体实施例的电路原理图第一部分（包括音效处理器、控制按钮、指示灯和存储器）；
图3为本发明用于耳机耳塞的3D音效处理电路具体实施例的电路原理图第二部分（包括输入接口、输入滤波电路、隔离电路、音效切换电路、AD转换模块、输出滤波电路和输出接口）；
图4为本发明用于耳机耳塞的3D音效处理电路具体实施例的电路原理图第三部分（包括电源模块、电池和USB接口）；
图5为本发明用于耳机耳塞的3D音效处理方法的模拟声源示意图。
附图标记
10 输入接口 11 输入滤波电路
12 隔离电路 20 AD转换模块
30 音效处理器 31 存储器
32 指示灯 33 控制按钮
40 功放电路 50 输出接口
51 输出滤波电路 60 音效切换电路
70 电源模块 71 电池
72 USB接口 73 滤波芯片
具体实施方式
为了更充分理解本发明的技术内容，下面结合具体实施例对本发明的技术方案进一步介绍和说明，但不局限于此。
如图1所示，本发明用于耳机耳塞的3D音效处理电路，包括用于外接音频信号的输入接口10，与输入接口10连接的AD转换模块20，与AD转换模块20连接的音效处理器30，与音效处理器30连接的功放电路40，及与功放电路40连接的用于输出3D音效音频信号的输出接口50；输入接口10、输出接口50均包括左声道信号线和右声道信号线（也包括用于拾取音频信号的MIC线）；AD转换模块20将模拟的音频信号转换为数字信号传输至音效处理器30；音效处理器30对接收到的左声道和右声道的数字音频信号进行高频中频低频处理，和/或二声道之间进行延时处理之后，并以模拟信号的方式输出；功放电路40对音效处理器30输出的模拟音频信号进行功率放大之后，输出至输出接口50。
其中，还包括连接于输入接口10与AD转换模块20之间的输入滤波电路11和隔离电路12；及连接于功放电路40与输出接口50之间的输出滤波电路51。还包括连接于输入滤波电路11、输出滤波电路51和功放电路40三者之间的音效切换电路60，当音效切换电路60工作时，功放电路40与输出滤波电路51相通，此时输出的为经过音效处理器30加工过的具有3D音效的音频信号；当音效切换电路60不工作时，输入滤波电路11的信号与输出滤波电路51相通，输出的为输入接口10的原始音频信号。
还包括与音效处理器30连接的存储器31，存储器31存储有音频文件，音效处理器30可以将音频文件转换为模拟的音频信号输出至功放电路40，此时，音效处理器相当于是具有3D音效的MP3播放器。存储器31也可以用于存储其它文件，比如控制程序文件。
还包括与音效处理器30连接的指示灯32和控制按钮33，指示灯32包括工作状态灯和工作模式灯；控制按钮33包括用于开机或关机的开关键和用于选择音效模式的模式键。按频率分，工作模式可以至少设有三种，高频处理，中频处理和低频处理。或者按使用者所处的场景来分，至少设有三种，封闭空间型，广场型，和过道型（或称为涵洞型）。
还包括与音效处理器30连接的电源模块70，及与电源模块70连接的电池71和USB接口72，USB接口72与音效处理器30之间还连接有用于升级的滤波芯片73。
如图3的电路原理图中，音频的输入接口为GNDN、LIN、RIN和MIC。输入滤波电路包括L13、L14、L15、L17、C47、C48、C55、C56、C57，及R36、R37。再通过LIN[2]、RIN[2]与U8（即SGM3002芯片，隔离电路)的COM1、COM2端脚连接，且与U9(即SGM3717芯片，音效切换电路)的NC1、NC2端脚连接。音频的输出接口LO、RO经过L20、L21(即输出滤波电路，还包括C49、C50)与U9(即SGM3717芯片，音效切换电路)的COM1、COM2端脚连接。U8（即SGM3002芯片，隔离电路)的NO1、NO2端脚与U5（即AD1370芯片，AD转换模块）的AINL、AINR端脚连接。U5（即AD1370芯片，AD转换模块）将数字化的音频信号传输至U1(即M3802微控制器芯片，音效处理器)进行音效处理。
如图2所示，音效处理器采用了M3802微控制器芯片（一种DSP处理器芯片），其周边配置有C41-C43构成的滤波电路，R25、R26和C39构成的电池电压检测电路，以及由R30、C32、C33构成的时钟电路。存储器为U5(即EN25Q16芯片)。
如图4所示，电源模块包括与电池（即BAT）连接的充放电管理电路（即U2，4054芯片），用于与音效处理器U1连接的降压电路U10(LP3220芯片)，用于切换外部电源与内部电池电源的电源切换电路Q1（即场效管，SI2301型），将5V电源转换为3.3V的电源转换电路U3(即电压转换芯片，LP3986型)，及用于关闭局部电源的电源开关电路Q2（即场效管，SI2301型），这样的话，可以节省电源，提高单次充电的使用时间。其中的滤波芯片为CMF2012芯片，连接于USB接口与音效处理器之间，是音效处理器的升级接口。其中的输入接口为音频插头，输出接口为音频插孔。由于录音信号不需要进行音频处理，所以，输入接口和输出接口的MIC拾音端脚直接相连。
于其它实施例中，也可以不采用音效切换电路，只能采用3D音效处理方式，没有直接输出原始音频的工作方式。
于其它实施例中，上述各器件也可采用其它型号的。
于其它实施例中，也可以设有外接存储卡的插槽，可以存储更大容量的音频文件。
本发明用于耳机耳塞的3D音效处理方法，该方法是将音频信号经过AD转换之后，输入至音效处理器，音效处理器根据接收到的左声道和右声道的数字音频信号生成多组频段不同并且存在时间差的音频信号，再以叠加的方式经左声道、右声道二个模拟音频信号输出端口输出；再经过功率放大，输出至耳机或耳塞的发音器件。
如图5所示，其中的多组频段不同并且存在时间差的音频信号包括基于听者正前方位置的中置声源8A生成的中置音频信号AL、AR，基于听者左前方位置的左前声源8B生成的左前音频信号BL、BR，基于听者右前方位置的右前声源8C生成的右前音频信号CL、CR，基于听者左后方位置的左后声源8D生成的左后音频信号DL、DR,基于听者右后方位置的右后声源8E生成的右后音频信号EL、ER,及基于听者左边位置的低音声源8F生成的低音音频信号FL、FR，且这四种音频信号输出至左耳塞/左耳机、右耳塞/右耳机时，根据其位置与听者的角度的不同，存在0.01-0.6ms的时间差。其中的各个声源是音效处理器根据设定参数生成的基于听者（即耳机或耳塞）若干距离之外的模拟声源，并且基于这些模拟声源生成多组的音频信号。其中的音频信号AL、BL、CL、DL、EL、FL以叠加的方式输出至左声道（即左耳塞或左耳机）。其中的音频信号AR、BR、CR、DR、ER、FR以叠加的方式输出至右声道（即右耳塞或右耳机）。其中的音频信号AL、AR采用高频声源（即高音频段），音频信号BL、CL、DL、EL 、BR、CR、DR、ER采用中频声源（即中音频段），并且使前后位置的频段不同，以让使用者识别出这些模拟出来的声源是来自前方或后方。
为了能体现更多不同的3D音效，还可以增加一个基于听者右前方的低音声源8G，在输出时，可以使用基于低音声源8F和/或低音声源8G生成的音频信号。
还可以通过控制按钮选择不同的模式，以选择不同的参数，以实现听者在不同场景下的3D音效体验，比如修改各个声源与听者的距离，实现家庭影院模式与电影院模式之间的切换，又比如，修改各个声源的频段，实现轻音乐模式与摇滚模式之间的切换。
于其它实施例中，当配带耳机或耳塞的使用者的头部发生变化时，通过设有的传感器，切换左声道与右声道的时间差，以适应使用者的头部移动角度；或者，当配带耳机的使用者在行走时，通过设有的传感器，检测到行走的速度，音效处理器仿真人体左右耳朵在该行走状态时接收到的音频信号，并输出至耳机或耳塞的发音器件。
于其它实施例中，也可以增设有GPS模块，通过GPS模块，获取到使用者所处在的位置，进而自动切换工作模式，比如在封闭空间型，广场型，和过道型（或称为涵洞型）之间切换。这样可以让使用者在使用这种耳机或耳塞时，3D音效会实时发生变化，并与其所位置相匹配。又比如，使用者在经过路口时，音效处理器，可以关闭其来车方向的音频输出（过路口的前半部分关闭左声道，过路口的后半部分关闭右声道），让其接收来车方向的车车辆声音，以提高通过路口的安全性。
于其它实施例中，还可以增设有定时模块，对使用者超过设定时间的3D音效模式进行切换，或者关闭3D音效模式，让使用者的耳朵从某一固定模式中跳出来，减少在某一种固定模式下的疲劳感。
为了能体现出3D音效，耳机耳塞的大小要一定的要求，最佳尺寸为直径在10-13mm之间。
综上所述，本发明音效处理电路采用音效处理器，对原始的音频信号生成多组基于听者不同位置的模拟声源而生成的不同频段的音频信号，并以叠加方式通过耳机耳塞的左右二个发音器件播放出来，可以模拟出来3D环绕音响所具有的3D音效。大大地改善了使用者的体验感。还可以通过传感器的检测，或者内置定时电路的方式，对3D音频进行相对应的改变。以改善长期使用耳机耳塞对耳朵造成的疲劳感。
上述仅以实施例来进一步说明本发明的技术内容，以便于读者更容易理解，但不代表本发明的实施方式仅限于此，任何依本发明所做的技术延伸或再创造，均受本发明的保护。本发明的保护范围以权利要求书为准。

Claims (10)

  1. 用于耳机耳塞的3D音效处理电路，其特征在于包括用于外接音频信号的输入接口，与输入接口连接的AD转换模块，与AD转换模块连接的音效处理器，与音效处理器连接的功放电路，及与功放电路连接的用于输出3D音效音频信号的输出接口；所述的输入接口、输出接口均包括左声道信号线和右声道信号线；
    所述的AD转换模块将模拟的音频信号转换为数字信号传输至音效处理器；
    所述的音效处理器根据接收到的左声道和右声道的数字音频信号生成多组频段不同并且存在时间差的音频信号，以叠加的方式经左声道、右声道二个模拟音频信号输出端口输出；
    所述的功放电路对音效处理器输出的模拟音频信号进行功率放大之后，输出至输出接口。
  2. 根据权利要求1所述的用于耳机耳塞的3D音效处理电路，其特征在于还包括连接于输入接口与AD转换模块之间的输入滤波电路和隔离电路；及连接于功放电路与输出接口之间的输出滤波电路。
  3. 根据权利要求2所述的用于耳机耳塞的3D音效处理电路，其特征在于还包括连接于输入滤波电路、输出滤波电路和功放电路三者之间的音效切换电路，当音效切换电路工作时，功放电路与输出滤波电路相通，此时输出的为经过音效处理器加工过的具有3D音效的音频信号；当音效切换电路不工作时，输入滤波电路的信号与输出滤波电路相通，输出的为输入接口的原始音频信号。
  4. 根据权利要求1所述的用于耳机耳塞的3D音效处理电路，其特征在于还包括与音效处理器连接的存储器，所述的存储器存储有音频文件，所述的音效处理器将音频文件转换为模拟的音频信号输出至功放电路。
  5. 根据权利要求1所述的用于耳机耳塞的3D音效处理电路，其特征在于还包括与音效处理器连接的指示灯和控制按钮，所述的指示灯包括工作状态灯和工作模式灯；所述的控制按钮包括用于开机或关机的开关键和用于选择音效模式的模式键；所述的音效处理器为DSP处理器。
  6. 根据权利要求1所述的用于耳机耳塞的3D音效处理电路，其特征在于还包括与音效处理器连接的电源模块，及与电源模块连接的电池和USB接口，所述的USB接口与音效处理器之间还连接有用于升级的滤波芯片。
  7. 根据权利要求1所述的用于耳机耳塞的3D音效处理电路，其特征在于所述的电源模块包括与电池连接的充放电管理电路，与音效处理器连接的降压电路，用于切换外部电源与内部电池电源的电源切换电路，将5V电源转换为3.3V的电源转换电路，及用于关闭局部电源的电源开关电路。
  8. 用于耳机耳塞的3D音效处理方法，该方法是将音频信号经过AD转换之后，输入至音效处理器，音效处理器根据接收到的左声道和右声道的数字音频信号生成多组频段不同并且存在时间差的音频信号，再以叠加的方式经左声道、右声道二个模拟音频信号输出端口输出；再经过功率放大，输出至耳机或耳塞的发音器件。
  9. 根据权利要求8所述的用于耳机耳塞的3D音效处理方法，其特征在于所述的多组频段不同并且存在时间差的音频信号至少包括基于听者正前方位置的中置声源生成的中置音频信号，基于听者左前方位置的左前声源生成的左前音频信号，基于听者右前方位置的右前声源生成的右前音频信号，基于听者左后方位置的左后声源生成的左后音频信号和基于听者右后方位置的右后声源生成的右后音频信号，且这四种音频信号输出至左耳塞/左耳机、右耳塞/右耳机时，存在0.01-0.6ms的时间差。
  10. 根据权利要求9所述的用于耳机耳塞的3D音效处理方法，其特征在于当配带耳机或耳塞的使用者的头部发生变化时，通过设有的传感器，切换左声道与右声道的时间差，以适应使用者的头部移动角度；
    或者，当配带耳机的使用者在行走时，通过设有的传感器，检测到行走的速度，音效处理器仿真人体左右耳朵在该行走状态时接收到的音频信号，并输出至耳机或耳塞的发音器件。
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