A subtractive electronic four-frequency audio circuit and method

A four-frequency, electronic technology, applied in transducer circuits, electrical components, sensors and other directions, can solve the problems of electronic four-frequency circuit design difficulties, small and other problems

Inactive Publication Date: 2018-02-23
SHANGHAI YINJIANG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the design difficulty of the electronic four-frequency division circuit, and to overcome the technical problem that the effective value of the background noise voltage output by the power amplifier is made as small as 1mV, and the method of subtraction is used to obtain the two channels of the midrange and bass. The electronic four-way audio system that once made people feel daunting can be easily designed and produced for popularization and promotion

Method used

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  • A subtractive electronic four-frequency audio circuit and method
  • A subtractive electronic four-frequency audio circuit and method
  • A subtractive electronic four-frequency audio circuit and method

Examples

Experimental program
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Effect test

Embodiment 1

[0021] exist figure 2 In the circuit diagram of the electronic four-frequency power amplifier powered by a single power supply, two four-power amplifiers TDA7379 with the same package as the TDA7294 are specially used to work in BTL output mode. Continuously output four 25W sine waves without clipping for a long time, and output four 20W sine waves without clipping continuously for a long time under the power supply of 19.5V regulated power supply to four 8 ohm speakers; the total output power of the four unit power amplifiers can be Reach 80W ~ 100W, enough to meet the playback requirements of home audio-visual audio. The circuit is easy to make. The point to note is that after soldering the components on the printed circuit board, it must be connected to the ground of the rectifier power supply (the negative pole of the 10000μ large capacitor), the ground of the regulated power supply of the power amplifier (the position of the ground terminal of TL431), and the stabilized ...

Embodiment 2

[0023] exist image 3 , Figure 4 In the circuit diagram of the electronic four-frequency power amplifier powered by positive and negative dual power supplies, it is required to use TDA7294 as the power amplifier of each unit. If the positive and negative 24V regulated power supply is connected, TDA7295 or TDA7296 can also be used as the power amplifier of each unit. get exactly the same output power. According to the heat dissipation requirements of the power amplifier IC, when the total output power of each unit power amplifier is not greater than 100W, the pre-frequency divider circuit and four power amplifier ICs can all be arranged on one PCB board; and the total output power of each unit power amplifier When it is 200W, the pre-divider circuit and power amplifier rectifier circuit must be made on one PCB board, and each of the four power amplifier ICs is made into a small PCB board, so that the four power amplifier ICs can be spread out and evenly placed on the radiator...

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Abstract

The invention relates to communication technologies and electronic circuits, in particular to a subtraction type electronic four-frequency-division audio circuit and method. The circuit is provided with a high pitch channel, an alto voice channel, a low bass channel and a super bass channel, the alto voice channel and the low bass channel are both obtained by adopting a subtraction circuit, crossover points of the adjacent channels can be automatically jointed together, the element parameter error is allowed to reach plus or minus10 percents, the circuit is suitable for mass production, and the consumer requirements are met; due to the facts that circuit design simulation software is fully used for performing appropriate division on the working frequency bands of all units and the adjacent frequency bands are compensated by reasonably utilizing the working transition frequency bands of all the units to smoothly connect all the frequency bands in a butt-joint mode, the closest ideal performance effect of overall replaying of a loudspeaker combination is achieved; in implementing the circuit manufacturing technology, for the fact that a circuit board has the defect that a copper foil resistance is big, several key points which impact a signal ground to be connected with a resistor are compensated by adopting a mode of specially welding a heavy gauge wire, and static output alternating-current noise is lowered to an effective value which is not larger than 1 mV.

Description

[technical field] [0001] The invention relates to a communication technology, an electronic circuit and a pre-stage frequency-dividing audio system, specifically an electronic four-frequency audio circuit and method designed in a subtractive manner. [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 commonly used audio frequency range of 20Hz to 14KHz, it can be divided into 4 intervals according to the 5-fold frequency relationship, which are 20Hz to 110Hz and 110Hz in turn. ~550KHz, 550Hz~2750Hz, 2750Hz~14KHz; when the audio signal is decomposed into the above 4 in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/00
Inventor 桂银良
Owner SHANGHAI YINJIANG ELECTRONICS CO LTD
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