speaker Speaker performance indicators
The electrical energy into the sound of the parts called the speaker, commonly known as speakers. If the host is the human brain, then the speaker is the voice of people, the sound is sweet, it depends on how their voice. Its role is to convert the audio signal into an acoustic signal and radiate it to the surrounding air medium.
Is a set of sound system indispensable important equipment, its quality, characteristics, the sound system sound plays a decisive role. Car horns are most common in tapered designs because the tapered design maximizes the effective area of the diaphragm as the installation location is limited in the vehicle, and the effective area of the diaphragm determines the low frequency response of the loudspeaker The
Longtan usually by the dust cap, sound basin, voice coil, vibration plate, terminal, upper and lower pole pieces, magnet and other components.
Speaker is the speaker system (commonly known as speakers) in the key parts of the speaker sound quality is mainly determined by the performance of the speaker, and then determine the entire set of playback indicators. Speakers of the performance indicators are rated power, rated impedance, frequency characteristics, harmonic distortion, sensitivity, directivity and so on.
The performance of the loudspeaker is measured primarily by the following metrics:
1, rated power (W) d
There are many kinds of distortion of the speaker, the common harmonic distortion (mostly by the speaker magnetic field uneven and vibration system distortion caused by, often in the low frequency), intermodulation distortion (due to two different frequencies of the signal at the same time to join the speaker, Mutual deterioration due to mutual modulation) and transient distortion (due to the inertia of the vibration system can not keep up with the signal changes, resulting in signal distortion) and so on. Harmonic distortion refers to the replay, the increase in the original signal is not the harmonic components. Speaker harmonic distortion from the magnet magnetic field is not uniform, the characteristics of the diaphragm, voice coil displacement and other non-linear distortion. At present, the better speaker distortion index is not greater than 5 [%].
2, sensitivity (dB / W)
The sensitivity of the loudspeaker is usually the size of the sound pressure measured at 1 m at the front of the loudspeaker when the input power is 1W. Sensitivity is a measure of whether the speaker can reproduce the details of the audio signal. The higher the sensitivity, the speaker can respond to all the details of the audio signal. The sensitivity of the Hi-Fi loudspeaker should be greater than 86dB / W.
Speakers for different directions of radiation, the sound pressure frequency characteristics are different, this feature is called the speaker of the directivity. It is related to the caliber of the loudspeaker, the point of the mouth when the point of sharp, caliber hour wide. Directivity is also related to frequency, in general, for 250Hz below the low-frequency signal, there is no obvious directivity. The high frequency signal below 1.5kHz has obvious directivity.
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