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The Need To Understand The Parameters When Buying Earphone
Jul 11, 2017

  The need to understand the parameters when buying Earphone

  Wireless headset is already one of the indispensable products in digital products. So people in the purchase of Earphone before the general how much will have some basic understanding, such as the Internet to see the parameters of Earphone products. But how to understand these parameters?

  Impedance: The smaller the headphone impedance, the easier it is to drive the headset, the easier it is to speak. In the desktop, DVD players and other headphone jack output on the machine, the general use of high-impedance Earphone more appropriate. Walkman, MP3 and other portable, power-saving machines, should choose low-impedance Earphone.

  Sensitivity: point to the headset input 1 mW power Earphone can be issued by the sound pressure level (sound pressure unit is decibel, the greater the sound pressure the greater the volume), so the higher the general sensitivity, the smaller the impedance, Earphone easier Sound, the easier it is to drive. However, it should be noted that the sensitivity of the printing on the headset package is the reference value obtained in the engineering test environment and does not represent the actual results used in the real environment and can only be used for reference.

  Frequency response: the frequency of the corresponding sensitivity value is the frequency response, drawn into the image is the frequency response curve, human hearing can reach the range of about 20Hz-20000Hz, the current mature headset process has reached this requirement. The wider the range of headset frequency response, the higher the unit quality. But as mentioned above, this data also has a lot of water, for reference only. For example, Earphone some of the price of about 100 yuan earplugs product nominal value is higher, but the real hearing effect is very different.

  Total Harmonic Distortion: Total harmonic distortion is the additional harmonic component of the output signal (harmonic and its frequency multiplication component) that is more than the input signal when input with the signal source, usually expressed as a percentage. In general, the total harmonic distortion at the frequency of 1000 Hz is minimal, so many products use the frequency distortion as its index. So the total harmonic distortion test is issued when the sound of 1000Hz to detect, this value is as small as possible. Headset unit because of small size, Earphone rigidity, so this indicator is relatively good.

  Parameters can explain some of the performance of the headset, but the parameters of the engineering conditions are different, many manufacturers in order to see the parameters, the test environment is tricky. Earphone So the parameters can only be used for reference, must not be the only indicator for the purchase of Earphone, or old words, by ear receipt.