Microbuzzer.com · Posted on 29-12-2008 by microbuzzer
frequency response refers to a constant voltage output of the audio signal is connected with the system, the speakers and buzzers with the sound pressure generated by changes in the frequency of occurrence of the increase or attenuation, phase change with the frequency of the phenomenon of sound pressure and phase associated with the frequency of the relationship between changes in frequency response is called. Also refers to the extent permitted by the amplitude of the sound system is able to playback frequency range, and in this context, changes in the volume of signals known as frequency response, also known as frequency characteristics. At rated frequency range, output voltage range of the maximum and minimum ratio to a few decibels (dB) to express its unevenness.
Frequency response in the concept of power quality is often used to describe systems or impedance measurement sensor with frequency changes.
Frequency range is the sound system to the minimum effective playback playback playback frequency and maximum effective range of frequencies between; frequency response refers to a constant voltage output of the audio signal is connected with the system, the speakers or buzzers produce sound pressure with frequency changes in the occurrence or increased attenuation, phase change with the frequency of the phenomenon of sound pressure and phase associated with the frequency of changes in relations between the (change) as the frequency response, unit decibels (dB). Frequency range and frequency response of these two concepts is not always distinguish between, on the frequency response is called.
Frequency characteristics of the sound system is commonly used decibel scale longitudinal coordinates power and logarithmic scale with the abscissa that frequency to describe the frequency response curve. When the voice of power than normal 3dB low power, this power point is called the frequency response of high-frequency cut-off point and the low-frequency cut-off point. Cut-off point of high-frequency and low frequency cut-off point between the frequency, which is the device’s frequency response; sound pressure and the phase lag of the curve with the frequency changes were called “amplitude-frequency characteristics” and “phase frequency characteristics”, collectively known as “the frequency characteristics. ” This is an examination of the merits of speaker and buzzer performance an important indicator, it is speaker and buzzer of the performance and price has a direct bearing on the value of its smaller dB note speaker or buzzer frequency response curve of the more flat, distortion of the smaller, higher performance.
In theory, 20 ~ 20000Hz frequency response enough. The voices of less than 20Hz, though people can not hear but can detect other sensory organ, which is able to feel the so-called low-intensity, so in order to perfect a variety of musical instruments and language broadcast signal, high-fidelity amplifiers to achieve the target in order to will be the harmonic tones are out of replay. Therefore, should be extended band amplifiers, the lower limit extends to 20Hz below the ceiling should be raised to more than 20000Hz. For the signal source (the first radio, sound recording, Block and laser disc players, etc.) that the method of the frequency response is different. For example, the provisions of the European Broadcasting Union FM stereo radio frequency response 40 ~ 15000Hz time for the 10 /-2dB, the International Electrotechnical Commission on the Block, the provisions of recording the lowest indicators of the frequency response: 40 ~ 12500Hz when 10 / -2.5 10 / -4. 5dB (common zone), the actual targets are to achieve significantly higher than this value. CD drive maximum frequency response 20000Hz, low-frequency side may be very low, only a few Hertz, which is CD quality playback machine one of the reasons why.
The frequency response of amplifier
As the amplifier pieces (bipolar junction transistor or FET transistor) itself is a very inter-capacitance, in addition, sometimes the existence of amplifier power resistance components, so that when amplifier input different frequency sine wave signal amplification circuit will different, as a function of frequency. This function is called the frequency response of amplifier or frequency characteristics.
Tags: db, Frequency Response, Hz
Posted in TECHNOLOGY
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