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Professional audio equipment consists of monitoring mixer; Power amplifier mixer; Portable mixer; Power amplifier; Moving coil microphone; Condenser microphone; Wireless microphone; loudspeaker box; Monitor speaker; Power amplifier speaker; Subwoofer; Equalizer; Reverberators; Effector; Delay device; Compressor; limiter; Sound splitter; Noise gate; CD player; Recording card holder; DVD Player; Projector; Modulator; Song ordering device; Headphones and many other devices.

組成設備的簡介

Brief introduction of the constituent equipment

功率放大器

power amplifier

功率放大器利用三極管的電流控制作用或場效應管的電壓控制作用將電源的功率轉換為按照輸入信號變化的電流。因為聲音是不同振幅和 不同頻率的波，即交流信號電流，三極管的集電極電流永遠是基極電流的β倍，β是三極管的交流放大倍數，應用這一點，若將小信號注入基 極，則集電極流過的電流會等于基極電流的β倍，然后將這個信號用隔直電容隔離出來，就得到了電流(或電壓)是原先的β倍的大信號，這現 象成為三極管的放大作用。經過不斷的電流放大，就完成了功率放大。

The power amplifier uses the current control function of triode or the voltage control function of FET to convert the power of power supply into current varying according to the input signal. Because sound is a wave with different amplitudes and frequencies, that is, AC signal current, the collector current of triode is always the same as the base current β Times, β Is the AC amplification factor of the triode. If a small signal is injected into the base, the current flowing through the collector will be equal to that of the base β Times, and then isolate the signal with a DC isolation capacitor to obtain that the current (or voltage) is the original β This phenomenon becomes the amplification effect of triode. After continuous current amplification, the power amplification is completed.

動圈話筒

Moving coil microphone

動圈話筒動圈式話筒，動圈式傳聲器)是把聲音轉變為電信號的裝置。動圈式 話筒是利用電磁感應現象制成的，當聲波使金屬膜片振動時，連接在膜片上的線圈(叫做音圈)隨著一起振動，音圈在磁鐵的磁場里振動 ，其中就產生感應電流(電信號)，感應電流的大小和方向都變化，變化的振幅和頻率由聲波決定，這個信號電流經擴音器放大后傳給揚聲器 ，從揚聲器中就發出放大的聲音。

Dynamic microphone (dynamic microphone, dynamic microphone) is a device that converts sound into electrical signals. The dynamic coil microphone is made by electromagnetic induction. When the sound wave vibrates the metal diaphragm, the coil connected to the diaphragm (called voice coil) vibrates together. The voice coil vibrates in the magnetic field of the permanent magnet, in which the induced current (electrical signal) is generated. The magnitude and direction of the induced current change. The amplitude and frequency of the change are determined by the sound wave. The signal current is amplified by the loudspeaker and transmitted to the loudspeaker, An amplified sound is emitted from the speaker.

音箱是整個音響系統的終端，其作用是把音頻電能轉換成相應的聲能，并把它輻射到空間去。它是音響系統極其重要的組成部分，因為它 擔負著把電信號轉變成聲信號供人的耳朵直接聆聽這么一個關鍵任務，它要直接與人的聽覺打交道，而人的聽覺是十分靈敏的，并且對復雜聲 音的音色具有很強的辨別能力。由于人耳對聲音的主觀感受正是評價一個音響系統音質好壞的重要的標準，因此，可以認為，音箱的性能高 低對一個音響系統的放音質量是起著關鍵作用。

The speaker is the terminal of the whole sound system. Its function is to convert audio electric energy into corresponding sound energy and radiate it to space. It is an extremely important part of the sound system, because it undertakes the key task of transforming electrical signals into acoustic signals for human ears to listen directly. It should deal directly with human hearing, which is very sensitive and has a strong ability to distinguish the timbre of complex sounds. Because the subjective feeling of human ears is the most important standard to evaluate the sound quality of a sound system, it can be considered that the performance of speakers plays a key role in the playback quality of a sound system.

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