What Is a Band Equalizer?

Equalizer is an electronic device that can separately adjust the amplification of electrical signals of various frequency components. It can compensate the defects of speakers and sound fields by adjusting the electrical signals of different frequencies, and compensate and modify various sound sources. Among other special effects, the equalizer on a general mixer can only adjust the electric signals at three frequencies: high frequency, intermediate frequency, and low frequency. In communication systems, inserting an equalizer in the baseband system can reduce the impact of inter-symbol interference.

Equalizer

Equalizer (Equalizer) is a kind of can be adjusted separately

Equalizer A component in a communication system that corrects the amplitude frequency characteristics and phase frequency characteristics of a transmission channel. A sine wave with a frequency of f is sent to the transmission channel. The characteristic that the amplitude ratio of the output voltage to the input voltage varies with f is called the amplitude-frequency characteristic, referred to as the amplitude-frequency characteristic. The phase difference between the output voltage and the input voltage varies with f. It is called phase frequency characteristic, and abbreviated as phase frequency characteristic. The signals transmitted by various transmission channels generally consist of components with different frequencies. Within the signal frequency range, if the amplitude-frequency characteristic of the channel is a constant value; the characteristic of the phase changing with f is a straight line, which can be written as

¢ (f) = 2ft + , t is a constant; (called phase intercept) is equal to n, n = 0, ± 2, ± 4, ..., then the signal waveform will not be distorted after transmission. Condition makes different frequency components have the same output-input amplitude ratio after transmission, and conditions and make them have the same time delay. However, the actual channel often does not meet the above conditions, so the signal is distorted. If the distortion exceeds the allowable amount, an equalizer is used to correct the channel characteristics.

The requirement for equalization is related to the nature of the signal. Because the human ear is not sensitive to the phase, when transmitting analog telephone signals, only the amplitude-frequency characteristics of the channel are required. When transmitting TV signals, the amplitude and phase frequency characteristics of the channel are required, otherwise the image will be distorted. When digital signal baseband transmission, the amplitude and phase frequency characteristics are required, because the waveform distortion will generate inter-symbol interference and increase the bit error rate. When transmitting a digital signal carrier, there is no requirement for the phase cut in the phase frequency characteristics of the channel. This is because a phase reference is not required when receiving a digital frequency modulated signal, and a phase recovery can be used to resolve the phase reference when receiving a digital phase modulated signal. In this way, only carrier-frequency characteristics and delay-frequency characteristics are required for carrier transmission.

Inserted in the baseband or IF part of the communication system, which can reduce inter-symbol interference and play a compensation role

There are three types of equalizers: graphic equalizers,

Hz16k-20k

Hearing effect: This frequency may not be heard by many people. Therefore, not hearing this frequency does not mean that the equipment cannot be played back. Of course, it does not mean that your hearing is not good enough. Only few people can hear 20kHz. This frequency can affect the brightness of the high frequency and the overall sense of space. Too little frequency will make people feel a little stuffy, too much will cause a sense of erratic and easy to cause hearing fatigue.

Representative musical instruments: electronic chorus, guzheng

Change at risk using equalizer

Version: 3.02

[Equalizer] Make Music's Sound Better (3 photos)

Size: 17.4MB

Chinese: No

System requirements: Compatible with iPhone 3GS, iPhone 4, iPhone 4S, iPod touch (3rd generation), iPod touch (4th generation), and iPad. Requires iOS 4.3 or later

If you are a music enthusiast, this app is essential for you. You can modify the EQ of the music through the Equalizer to make your sound better. Simple operation, a little bit of music instantly becomes better.