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Professional analysis of audio frequency range and frequency response

Release time: 2017/9/7 14:54:48

In actual use, the frequency range and frequency response of audio has always been a concern, but because of the knowledge of professional subdivision, many people understand the frequency range and frequency response to one-sided. What is the difference between frequency range and frequency response? Is not the higher the frequency the better the sound effect? How high is the sound frequency? For such problems, Xiao Bian made the following compilation:
Definition of frequency range and frequency response
The frequency range refers to the range between the lowest effective playback frequency and the highest effective playback frequency that the sound system can play back. The frequency response refers to the audio pressure generated by the speaker when the audio signal outputted with constant voltage is connected with the system (The amount of change) is called the frequency response, the unit decibels (Db), and the frequency of the phase and the frequency of the change (the amount of change) is called the frequency response, the unit decibels (Db).
Identification of Sound System Frequency
Frequency characteristics of the sound system The ordinate of the commonly used decibel scale represents the power and the frequency response curve representing the frequency of the logarithmic scale. When the sound power is 3dB lower than the normal power, this power point is called the frequency response of the high-frequency cut-off point and low-frequency cut-off point. The frequency between the high-frequency cut-off point and the low-frequency cut-off point, that is, the frequency response of the device; sound pressure and phase lag with the frequency of the curve were called "amplitude frequency characteristics" and "phase frequency characteristics", collectively "frequency characteristic". This is an important indicator of the merits and demerits of the speaker performance. It has a direct relationship with the performance and price of the speakers. The smaller the decibel value, the more flat the frequency response curve of the speakers, the smaller the distortion and the higher the performance. Such as: a speaker frequency response is 60Hz ~ 18kHz +/- 3dB. These two concepts sometimes do not distinguish, called frequency response.
How high is the sound frequency?
In theory, the frequency response from 20 to 20000 Hz is sufficient. Less than 20Hz sound, although not hear the other people but the sensory organs can be aware of, that is, can feel the so-called bass intensity, so in order to perfectly play a variety of musical instruments and language signals, the amplifier to achieve high-fidelity goals, The harmonics of the harmonics are reproduced. So the amplifier should be extended band, the lower limit extends to 20Hz below, the upper limit should be increased to more than 20000Hz. The representation of the frequency response for the source (radio, recording, laser, etc.) is different. For example, the frequency response of the FM radio broadcast by the European Broadcasting Union is 10/2 dB at 40 to 15000 Hz, and the International Electrotechnical Commission has a minimum frequency response to the recording station: 10 to 2.5 e. 5dB (ordinary band), the actual can achieve the indicators were significantly higher than this value. CD machine frequency response of the upper limit of 20000Hz, low frequency side can be very low, only a few hertz, which is CD player playback quality one of the reasons.
The wider the frequency range, the better the sound effect?
Constitute the harmonic components of the sound is very complex, not the wider the frequency range of sound like, but this is for the middle and low multimedia speakers is still basically correct. In the frequency response we usually see the "system frequency response" and "amplifier frequency response," the two terms, to know the "system frequency response" is always better than the "amplifier frequency response" range, so only marked "Amplifier frequency response" is no meaning, it is only used to deceive some unaware of the consumer. Now the speaker manufacturers on the frequency of the system generally marked the scope of the large, high frequency part of the difference is not a lot, but in the bass side marked very unreal, foreign famous brand HiFi (hi fidelity) speakers, but also marked 4,50Hz or so , While the domestic two or three hundred ordinary wood speakers actually dare to mark this data, really make people laugh off the teeth! So pay attention to everyone low-frequency voice must be audible, do not easily believe that the value on the leaflet. Multimedia speakers in the music is to play MP3 or CD music, songs, game sound effects, background music and video in the vocal and ambient sound-based, these sounds are mostly in the treble, so the selection of multimedia speakers Should be more fancy in its high-frequency voice performance capabilities, rather than low-frequency band. If the pursuit of theater effect, then a strong enough subwoofer can definitely meet your needs.
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