A multi-channel active electronic frequency division audio circuit and method

Abstract

The present invention relates to communication technology, electronic circuit and pre-stage frequency-division audio system, specifically an electronic six-frequency active electronic frequency-division audio circuit and method designed by using an active filter circuit. The input signal first passes through C1, R1 enters the amplifier composed of IC1 and C2, R2, R3, R4, R1 and C2 form a simple RC first-order low-pass filter circuit, C2 attenuates the ultrasonic signal in the input signal; R2 is connected to the positive input of IC1 to the middle R3 is the resistor connecting the negative input terminal of IC1 to the midpoint; R4 is the negative feedback resistor connected between the output terminal of IC1 and the negative input terminal; the ratio of R4 and R3 determines the magnification of IC1, according to the needs Set between 5 and 15 times, the signal amplified and output by IC1 is divided into six channels. The present invention rationally utilizes the working transition frequency bands of each unit to compensate adjacent frequency bands to smoothly connect each frequency band, so that the overall power amplifier of the speaker combination can achieve the closest ideal performance effect.

Description

[technical field] [0001] The invention relates to a communication technology, an electronic circuit and a pre-stage frequency-dividing audio system, specifically a multi-channel active electronic frequency-dividing audio circuit with more than three channels and a method designed with an active filter circuit. [Background technique] [0002] People use an oscilloscope or simulation software to observe that two sine wave signals with the same amplitude and equal to A with a frequency difference of 4 times, the combined amplitude will be equal to 2A; if there are N amplitudes with a difference of 4 times in high and low frequencies in the composite signal The same sine wave signal is equal to A, the amplitude of the combined superposition will be equal to NA; and in the audio frequency range of 20Hz to 20KHz, it can be divided into 5 intervals according to the 4-fold frequency relationship, which are 20Hz to 80Hz, 80Hz to 320KHz , 320Hz ~ 1280Hz, 1280Hz ~ 5120Hz, 5120Hz ~ 20kH...

AI Technical Summary

Problems solved by technology

However, since the design of the electronic six-frequency circuit is much more difficult than the design of the simple electronic three-frequency circuit, even the electronic four-frequency circuit is much more difficult than the electronic three-frequency circuit design, so a new comprehensive evaluation method must be adopted. The output signals of all channels are combined and analyzed by circuit simulation software, and the parameters of the frequency division components of each channel can be determined under the requirement that the overall frequency-amplitude response curve can meet the requirement that the deviation is not greater than ±2dB, which has led to the production so far Almost all high-fidelity speakers on the market stay in the two-way state, and even electronic three-way audio systems are rarely mass-produced and sold.

Images