Audio基本知识说明1.人的可听频率范围：人类能听到的频率范围是：20Hz—20KHz，在这个频率范围内的声音，一般叫做音频。
人的发出声音的频率一般在3.4KHz以下。
2.声音的大小--人对声音波形振幅的反应--有振幅为A，B的两个信号强度之差用数学式表示如下dB = 20 log（A/B），单位是分贝。
3.听力的频谱特性为了分析声音具有的频率特性作傅立叶变换。
在频率范围内的信号的频谱特性表现出周期性的特点。
观察在频率范围内的声音时，其频谱由基频和频率为这个基频频率的整数倍的高频构成。
--基频通常称为音调。
数字声音1.为了容易处理，并使传送时噪声降低，将模拟声音数字化。
（模拟量使用困难）2.PCM（脉冲编码调制）a.采样：把原信号在时间轴上按一定的周期采样。
Nypuist Sampling Theorem为了使信号恢复，采样频率是信号频率的2倍。
对频率范围300—3.4KHz的声音信号采样频率为8KHz（1秒8000次）。
b,量化量化杂音：量化时，把连续值用离散值表示时，发生的误差。
这是随数字化带来的时质量下降的主要因素。
c,编码一般电话声音的采样信号，用8bit来编码（最大值和最小值之间有256级）。
基本单位1.dB除用于功率比较，还用于声压，电压或电流等量的振幅比较，计算公式是把各自的标准电压为Vref，输出电压为Vo，其比较值的平方与功率成比例，dB = 10log(Vo/Vref)2 = 20log(Vo/Vref）。
电压为频率的2倍值。
功率提高3db,提高一倍。
电压提高6db，提高一倍。
声压，电流与电压相同。
8KHz*8bit=64Kbps2.dBm(deciBelmW)表示以mW级来衡量的电功率。
0dBm=1mWdb与Watt对应，dBm与mWatt对应3.dBV和dBv(decibel V)dBv以0.775v为零点，负载为600Ω的电路为标准，dBV与电路的阻抗无关，表示的是交流信号的电压大小，以1V为零点标准。
PYD1964B 6-Channel Bluetooth DJ Mixer U S ER M A N U A LSafety PrecautionRead all documentations carefully before operating the equipment. Retain this manual for future reference. Follow all instructions printed on unit for proper operation.Do not opern cover (or back cover) to reduce the risk of electric shock or fire. There are noUser serviceable parts inside. Refere servcing to qualified service personnel.This symbol is used to alert the operator to the presence of important operating instructionsAnd precautions detailed in the documentation manual.This symbol is used to warn operators that uninsulated dangerous voltages are presentWithin the products enclosure that may pose a risk of electric shock.Warning: To avoid fire or risk of electric shock, do not expose this unit to rain or moisture.Notes:＊Make sure power outlets conform to the power requirements listed on the back of the unit.＊Main Voltage must be correct and the same as that printed on the rear of the unit.＊Do not use the unit if the electrical cord is frayed or broken.＊The unit shall not be exposed to dripping or splashing and no objects filled with liquids, such as vases, shall be placed on unit.＊The unit shall be connected to a mains socket outlet with a protective earth ground connection.＊Do not use equipment if Power plug is damaged, smashed, bent or pinched.Warning:＊Using, adjusting or changing program control beyond this specification may cause dangerous radiation.＊The unit should be serviced by qualified service personnel.＊When repairing, use only same specification parts.Notes:●Select the voltage requirement by adjusting the voltage selector switch at the rear panel.●Make sure that the power of the equipment is off and disconnected from the main voltage before switchingthe voltage selector to the required setting. We will not be responsible for damages arising from the improper installation, wiring or operation due to the fault or negligence of the user.IMPORTANT: For Your Attention1) Read manual --- Please read through safety and operating instruction carefully before using this unit.2) Keep manual --- Please keep this manual for future reference.3) Please heed important warnings --- Please operate unit according warning and note of manual.4) Operate according what the manual indicates --- Operate according to instruction of manual.5) Water and moisture --- Position of the unit away from water or any kind of moisture.6) Carriage and rack --- The unit should be fitted to match carriage and rack that the manufacturer recommends. Please be careful with carriage while moving the unit.7) Heat --- Device should not be near heat sources such as radiator, stove and amplifier etc.8) Power supply --- The unit only operates with proper rated power supply. Please ask dealer or local power supply company if you are unsure what type of power supply. If operating with batteries or other power supply, please refer to this booklet.9) Connection ground or polarization --- Perhaps this unit has a polarization AC plug. This plug only has one direction of insertion. Please insert properly for safety.10) DO not smash, pinch or try to repair power cord.11) Clean --- Clean this unit with a soft cloth. Prevent water from entering unit through openings.12) For device with AC power cord, check AC plug sheet and all of exposed metal parts with ohmmeter before using, and resistance ought to be more than 100K ohm.13) Long period of non-use--- Unplug the power cord if the unit is not used for a long time14) Prevent solids and liquids from entering into unit – BE CAREFULL, DO NOT INSERT SOLID OR SPATTER LIQUID TRHOUGH OPENINGS OF UNIT.15) IF BROKEN OR NEEDS REPAIR --- In case of following problems, refer to qualified service personnel:A) Power cord or plug mangled or damagedB) Solid or liquid has entered the casing of the unitC) The unit was exposed to rain or extreme weatherD) Device does not function properlyE) The unit has fallen or is broken, or if casing is damaged16) Repair --- Operate according to instructions, do not try to open or repair unit. All of above symptoms should referred to qualified service personnel17) Ventilation --- The function of ventilation holes in unit are for air circulation and cooling. It ensures operation reliability and prevents overheating. Do not block or cover air ways. Do not place unit on bed, blanket, sofa or similar surface. Do not place this unit in an enclosed area, such as an enclosed cabinet or locker.18) Accessories --- Do not use parts that manufacturer does not recommend in order to avoid damage19) Auxiliary equipment --- Do not place this unit on unstable mobile shelf, tripod or table. It can cause serious harm to children or adults if the unit falls. Please use mobile shelves, tripods or tables that manufacturer recommends.20) Preventing lightning strike ---Add lightning protection to all outdoor antennas and use surge protectors, if the unit is not used for a long time, unplug the power cord.21) Replace parts --- if the unit requires replacement parts, you must replace with manufacturer recommended, or compatible part.22) All repairs and changes to unit must be performed by qualified technician to assure proper safetyControl & Layout Configuration1) MIC INPUTMicrophone with balanced connector or 1/4” connector can be connected to thest inputs 2) MIC HIGHThis knob adjusts the high tone of the microphone3) MIC MIDDLEThis knob adjusts the middle tone of the microphone4) MIC BASSThis knob adjusts the bass tone of the microphone5) MIC 1 LEVEL CONTROLLet you control the MIC1 level as they enter the mix.6) MIC 2 LEVEL CONTROLLet you control the MIC2 level as they enter the mix.7) MIC TALKOVERThere are Talk over, Mic On and Mic Off functions. The sound pressure level of audio from input sources will be decreased while TALKOVER mode is selected.8) MIC frequency kill switchesAllows you to kill the selected frequency range instantly for interesting effects. LED lights to indicate kill is activated.9) MIC CUEUse it to monitor the microphone input source10) 10 BAND EQUALIZERAllows you to tailor the mixer output to suit your taste or performance enviroment. Eachfrequency range can be cut or boost by up to 10dB.11) CHANNEL ASSIGN SELECTORLet you select the input source to be mixed by the crossfader control12) CROSSFADERAllow you to smooth the switch between the input sources assigned to channel A & channel B 13) GAIN CONTROLLets you adjust the gain of the input source.14) CHANNEL INPUT SELECTORLet you to choose the input source to play for each channel15) CHANNEL CUEUse it to monitor the selected audio input source.16) CHANNEL LEVEL CONTROLLet you control mixer’s overall channel volume level17) DUAL DISPLAY METERIndicate the levels of left and right master channels18) BALANCE CONTROLMaster and Zone balance control19) MONO & STEREO SWITCHTo choose the mono or stereo output20)Level ControlLets you control the mixers overall ZONE or MASTER volume level, if you set up remote speakers or DJ booth monitors.21) 6 DIGITAL SOUND EFFECTSSix different sound effects (ALLIEN, APPLAUSE, SIREN, CROAK, GLASS & SCREAM ) may be added to your mix by pressing the SOUND EFFECTS CONTROL BUTTONS..22) EFX VOLUMEThe volume of the effects can be adjusted using the rotary EFX VOLUME23) SPEED CONTROLThe pitch of the effects can be increased or decreased using the rotary SPEED CONTROL 24) ECHO ON/OFFTurn echo on or off.25) ECHO DELAY CONTROLLet you adjust the delay time for echo26) ECHO REPEAT CONTROLLet you control the time period during which the echo is repeated27) ECHO LEVEL CONTROLControl the depth of the echo effect28) USB DJ LAMP ADAPTORAllows you to connect 5V/500mA lamp to light the panel.29) POWER SWITCHPress this button to turn on the unit after all input devices are already connected to prevent Damage to you equipment. Turn the mixer on before you turn on the amplifier and turn off Amplifiers before you turn off the mixer.30) EQUALIZER ON/OFF SWITCHAllow you to select the equalizer working situation31) LED LIGHT CONTROLThere are 3 selector to allow you to off the lights on both the knobs and the decoration line, or only lights on the knobs, or both the decoration line and knobs LED on.32) HEADPHONE VOLUME CONTROLLet you to control the volume level of headphone33) HEADPHONE JACKAccept headphone with 1/4” plug34) HEADPHONE CUE/PGM CONTROLLet you to listen simultaneously or separately to the CUE material or the active program. 35) POWER SUPPLY INPUT JACKTo connect with the power cord36 & 37) BALANCE OUTPUT CONNECTORConnect the mixer to a amplifier with the balanced connector38) ZONE OUTPUTConnect the mixer to a second receiver or amplifier powering speakers in the DJ booth or in a remote location.39) RECORD OUTPUTConnect the mixer to a second receiver or amplifier powering speakers in the DJ booth or in a remote location.40) MASTER OUTPUTConnect the mixer to an amplifier41) WINDOWSTo allow the BLUETOOTH signal transmit.42) LINE INPUTLet you connect most high-level audio source, such as CD players, tape deck, tuner or VCR.43) DUAL PURPOSE STEREO INPUTSFor using a turntable with a magnetic cartidge or a high level input source44) INPUT SELECT SWITCHESSet these switches based on what is plugged into Phono1/Line1 and Phono2/Line 3 inputs jacks45) MICROPHONE JACK INPUTTo connect with a microphone 1/4” Jack46) GROUND SCREWFor turntables47) BLUETOOTH ANTENNAFor better performance of bluetooth signal receiving48) BLUETOOTH OUTPUTConnect the mixer to another unit using a RCA plugs49) INPUT SELECT SWITCHESSet these switches based on what is plugged into Phono1/Line1 and Phono2/Line 3 inputs jacks。
打碟机的应用原理简介打碟机（也被称为DJ设备）是一种用于混音和创造音乐的专业设备。
它具有丰富的功能，可以让DJ轻松地在演出中创造出多样的音乐效果。
本文将介绍打碟机的应用原理，包括其工作原理、主要功能和操作方法。
工作原理打碟机是通过数字信号处理（DSP）技术实现的。
它基于音频信号的采样、处理和合成，通过各种特殊效果和功能，将不同音乐元素进行混合和变换，从而实现音乐的剪辑、重组和改造。
主要功能打碟机具有以下主要功能：•音频采样：打碟机可以从不同的音频源（如CD、MP3文件或其他外部设备）中采样音频信号。
这些采样的音频信号可以通过打碟机进行混合和处理。
•音频处理：打碟机提供了多种音频处理效果，如均衡器、滤波器、声音延迟和重采样等。
这些效果可以帮助DJ调整音乐的各种参数，使其符合演出需求。
•混音和过渡效果：打碟机可以将不同的音频源进行混合，使它们同时播放或交替播放。
此外，打碟机还提供了各种过渡效果，如淡入淡出、音频剪辑和循环播放等，以实现音乐的平滑过渡和创意性混合。
•采样和循环：打碟机允许DJ对音频信号进行采样和循环处理，以创造出独特的音乐效果。
通过采样和循环功能，DJ可以重复播放特定的音乐片段或节奏，从而创造出律动感强烈的音乐。
操作方法以下是使用打碟机的基本操作方法：1.选择音频源：将CD或外部设备连接到打碟机，通过控制面板选择需要采样的音频源。
2.调整音频参数：使用打碟机上的调音台或控制杆，调整各种音频参数，如音量、音调和均衡器的设置，以达到所需的音乐效果。
3.选择混合和过渡效果：根据需要，选择适当的混合模式和过渡效果。
可以使用打碟机上的按钮或触摸屏进行选择和调整。
4.应用采样和循环：通过按下相应的按钮或触摸屏，对音频信号进行采样或循环处理。
可以自定义采样时间和循环周期，以获得想要的效果。
5.即时预听和调整：在演出前，可以通过打碟机上的耳机预览所做的改变，并对音频参数进行微调。
这有助于确保音乐效果符合预期。
AUDIO工作原理声音是由物体振动产生的机械波，传播时会通过空气或其他媒介，最终被人耳接收和听到。
AUDIO设备的工作原理就是对声音信号进行放大和处理，使得声音能够在更大范围内传播，并且能够清晰地被听到。
放大是AUDIO设备的主要功能之一、声音信号一般很微弱，无法直接传播到远处，因此需要通过放大器对声音信号进行放大。
放大器的核心部件是放大电路，它能够将微弱的声音信号转化为较大的电信号。
这个过程中，声音信号经过放大电路的放大后，会转化为电流或电压信号，并通过音箱发出。
放大器的工作原理是利用了电子器件的特性。
放大电路主要由晶体管或场效应管等电子器件组成。
当微弱的声音信号进入放大电路时，晶体管或场效应管会放大信号并输出。
放大程度由放大器的增益控制决定。
增益越大，声音信号放大的幅度越大，声音也就越响。
除了放大之外，AUDIO设备还可以对声音进行处理。
处理的方式包括滤波、均衡、混响等。
滤波能够选择性地增强或降低一些特定频率的声音信号，以便调整音色。
均衡能够调整不同频率范围的音量，使声音更加均衡。
混响则可以模拟出各种不同的音效，使声音更加丰富多样。
最后，AUDIO设备还需要使用扬声器将声音信号转化为机械波，使声音能够传播到更远的地方。
扬声器通过振动片或振动膜来产生声音，当电流通过扬声器时，会在振动片或振动膜上产生电磁感应力，从而产生振动。
振动片或振动膜的振动通过空气的压缩与稀疏，形成机械波，最终传播到人耳并被听到。
总结一下，AUDIO设备的工作原理主要包括声音信号的放大和处理，以及通过扬声器将声音信号转化为机械波使声音能够传播。
声音信号经过放大器放大后，经过滤波、均衡、混响等处理，再通过扬声器发出。
通过这些工作原理，AUDIO设备能够将声音在更远的距离内传播，并且能够以清晰、高质量的方式被听到。
