Multi-channel active electronic frequency division sound circuit and method

Abstract

The present invention relates to a communication technology, an electronic circuit and a front frequency division sound system, and especially relates to an electronic six-frequency-division active electronic frequency division sound circuit and a method designed through adoption of an active filter circuit. An input signal enters an amplifier consisting of an IC1, a C2, an R2, an R3 and an R4 through a C1 and an R1, wherein the R1 and the C2 form a simple RC first-order low-pass filtering circuit, the C2 is used for attenuating a ultrasonic frequency signal in the input signal; the R2 is a resistor for connecting a positive input end of the IC1 to a neutral point; the R3 is a resistor for connecting a negative input end of the IC1 to the neutral point; the R4 is a negative feedback resistor connected between an output end of the IC1 and the negative input end of the IC1; the amplification factor of the IC1 is determined by the ratio of the R4 and the R3, and the amplification factor is set between 5 times and 15 times according to needs, and a signal amplified and outputted by the IC1 is divided into six channel signals. Through adoption of the circuit and the method of the present invention, operation transition frequency bands of various units are reasonably utilized to compensate adjacent frequency bands, so as to achieve smooth connection of the frequency bands, therefore, the whole power amplifier of the loudspeaker combination can achieve the effect closest to the ideal performance.

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.

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