CN205793253U

CN205793253U - A kind of enhancing bass sound effect circuit

Info

Publication number: CN205793253U
Application number: CN201620720607.1U
Authority: CN
Inventors: 周祥
Original assignee: DONGGUAN ZHENGYANG ELECTRONICS Co Ltd
Current assignee: DONGGUAN ZHENGYANG ELECTRONICS Co Ltd
Priority date: 2016-07-11
Filing date: 2016-07-11
Publication date: 2016-12-07
Anticipated expiration: 2026-07-11

Abstract

The utility model discloses a kind of enhancing bass sound effect circuit, by sampling a signal from audio amplifier circuit, decay through attenuator circuit, the Frequency point needing to compensate is chosen again by frequency selection circuit, process circuit via audio delay again and sampled signal is carried out certain time-delay, it is mixed together with former audio signal the most again, is given to power amplifier and pushes sounding body；Original bass is reset again, is equivalent to a resonance in big volume sound chamber, thus realizes strengthening the audio of bass.

Description

A kind of enhancing bass sound effect circuit

Technical field

This utility model relates to audio signal processing technique field, particularly a kind of enhancing bass sound effect circuit, it is adaptable to audio amplifier, The power amplifier products such as sound console.

Background technology

Small size audio amplifier is little due to phonation unit, and sound cavity volume is little, and the reducing power of bass is very poor, for strengthening bass table Existing, industry also develops multiple compensation way:

1, the relative gain of circuit raises bass: circuit simply improves Q-value by low pass circuit, in large volume audio amplifier The most applicable, but in small size audio amplifier, need offset relatively big, the reserved power of circuit wants typhon ability to bear to increase, Therefore cost also can be the highest；

2, DSP sound effect processor is increased: compensation effect is fine, and cost is the highest, inconvenient debugging, it is necessary to use MCU control System；

3, multiple body structure: Multicarity resonant structure, passive basin structure, multiple resonant structures, these structures can be significantly Lifting bass, but affected by outward appearance and volume, the bass performance of the audio amplifier in practicality is the most general.

Utility model content

The technical problems to be solved in the utility model is for above-mentioned the deficiencies in the prior art, it is provided that a kind of enhancing bass sound Effect circuit.

For solving above-mentioned technical problem, technical solution adopted in the utility model is:

A kind of enhancing bass sound effect circuit, includes that be electrically connected between audio input end and audio output adds successively Musical instruments used in a Buddhist or Taoist mass and power amplifier, at the outfan of power amplifier successively through attenuator circuit, frequency selection circuit, delay circuit and adder Input be electrically connected with.

In technique scheme, the first input end of described adder is electrically connected with described audio input end, and second is defeated Enter the outfan electric connection of end and described delay circuit.

In technique scheme, it is electrically connected with between described adder and power amplifier by electric capacity C1 and resistance R2 group The frequency-selecting block isolating circuit become.

In technique scheme, described attenuator circuit includes sample resistance R4 and damping resistance R5.

In technique scheme, described frequency selection circuit is second order active low-pass filter circuit.

In technique scheme, low frequency signal is coupled to described delay circuit by electric capacity C5 by described frequency selection circuit.

In technique scheme, during by adjusting the size of delay capacitor C6 thus adjusting the time delay of described delay circuit Between.

In technique scheme, described delay circuit couples a signal to the input of adder by electric capacity C8 and resistance R8 End, and the source of sound mixing coupled with the resistance R1 of audio input end.

In technique scheme, described power amplifier and delay circuit all pass through filter circuit and external power source VDD electricity Property connect.

The beneficial effects of the utility model are:

1) by sampling a signal from audio amplifier circuit, decay through attenuator circuit, then chosen need by frequency selection circuit Frequency point to be compensated, then via audio delay process circuit, sampled signal is carried out certain time-delay, believe with former audio frequency the most again Number it is mixed together, is given to power amplifier and pushes sounding body；Original bass is reset again, is equivalent to the most humorous of big volume sound chamber Shake.

2) sample from mixed circuit, therefore in the unit interval, the audio frequency of sampling can repeatedly circulate above-mentioned action, it is achieved With the repeatedly resonance that cavity is the same.

3) sampled signal is much smaller than audio signal, disturbs thus without to keynote.

4) sampled signal delay time is adjustable, mates according to the difference of product, does not haves taking off in sense of hearing Joint sense.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model；

Fig. 2 is electrical block diagram of the present utility model.

Detailed description of the invention

Below in conjunction with the accompanying drawings this utility model is described in further detail.

As it is shown in figure 1, a kind of method strengthening bass audio, be input between the output of loudspeaker audio frequency from audio frequency, including with Lower step:

Step 1: sampling, is amplified audio signal A of input, and audio signal B after amplifying is sampled, Go out sampled signal A；

Step 2: decay, by sampled signal A after decay, obtains sampled signal B,

Step 3: frequency-selecting, chooses the Frequency point needing to compensate, obtains sampled signal C；

Step 4: time delay, then sampled signal C is carried out time delay, obtain sampled signal D；

Step 5: mixing, mixes sampled signal D with audio signal A, obtains audio signal C；

Step 6: circulation, repeats step 1-step 5 in Preset Time, obtains audio signal D；

Step 7: amplify, amplifies audio signal D, obtains audio signal E of output.

Strengthen bass sound effect circuit as in figure 2 it is shown, a kind of, use the above-mentioned method strengthening bass audio, include successively The adder being electrically connected between audio input end and audio output and power amplifier, at the outfan of power amplifier It is electrically connected with the input of adder through attenuator circuit, frequency selection circuit, delay circuit successively.

Wherein, the first input end of described adder is electrically connected with described audio input end, and the second input is with described The outfan of delay circuit is electrically connected with.

Wherein, be electrically connected with between described adder and power amplifier the frequency-selecting that is made up of electric capacity C1 and resistance R2 every Straight circuit.

Wherein, described attenuator circuit includes sample resistance R4 and damping resistance R5.

Wherein, described frequency selection circuit is second order active low-pass filter circuit.

Wherein, low frequency signal is coupled to described delay circuit by electric capacity C5 by described frequency selection circuit.

Wherein, the delay time of described delay circuit is adjusted by adjusting the size of delay capacitor C6.

Wherein, described delay circuit couples a signal to the input of adder, and and sound by electric capacity C8 and resistance R8 The source of sound mixing that the resistance R1 of frequency input terminal is coupled.

Wherein, described power amplifier and delay circuit all pass through filter circuit and are electrically connected with external power source VDD, prevent The ripple of external power source produces noise.

Operation principle of the present utility model:

Audio signal is input to operational amplifier U1-A, resistance R10, R9 Gain tuning to amplifier by resistance R1；Amplifier The signal of output every being directly input to power amplifier U2 through electric capacity C1, resistance R2 frequency-selecting, is promoted loudspeaker by U2, completes main sound wave also Former；Resistance R4 decays with resistance R5 series connection from the sampling of power amplifier outfan；Electric capacity C3, C4, resistance R6, R7 and operational amplifier U1-B Form a second order active low pass circuit, electric capacity C3, C4, resistance R6, R7 more than adjustable lowpass frequency；Electric capacity C5 is by low frequency Signal is coupled to delay chip U3, leads to the size change delay time adjusting electric capacity C6；Resistance R12, electric capacity C12 power supply are filtered Wave circuit, prevents the ripple of external circuit from producing noise；Electric capacity C8, resistance R8 couple a signal to the input of amplifier U1-A End, the source of sound coupled with resistance R1 forms mixing；Audio signal is via the circulation of above-mentioned each circuit so that low frequency realizes repeatedly Resonance；The intensity of resonance is according to the difference of body structure, and by adjusting attenuation and delay time, available one mates the most Bass compensation.

Above embodiment simply indicates that rather than limits this utility model, therefore all according to this utility model patent application The equivalence that method described in scope is done changes or modifies, and is all included in this utility model patent claim.

Claims

1. one kind strengthens bass sound effect circuit, it is characterised in that: include that being electrically connected at audio input end exports with audio frequency successively Adder between end and power amplifier, power amplifier outfan successively through attenuator circuit, frequency selection circuit, time delay electricity Road is electrically connected with the input of adder.

A kind of enhancing bass sound effect circuit the most according to claim 1, it is characterised in that: the first input of described adder End is electrically connected with described audio input end, and the second input is electrically connected with the outfan of described delay circuit.

A kind of enhancing bass sound effect circuit the most according to claim 1, it is characterised in that: described adder and power amplification The frequency-selecting block isolating circuit being made up of electric capacity C1 and resistance R2 it is electrically connected with between device.

A kind of enhancing bass sound effect circuit the most according to claim 1, it is characterised in that: described attenuator circuit includes sampling Resistance R4 and damping resistance R5.

A kind of enhancing bass sound effect circuit the most according to claim 1, it is characterised in that: described frequency selection circuit is that second order has Source low-pass filter circuit.

A kind of enhancing bass sound effect circuit the most according to claim 1, it is characterised in that: described frequency selection circuit passes through electric capacity Low frequency signal is coupled to described delay circuit by C5.

A kind of enhancing bass sound effect circuit the most according to claim 1, it is characterised in that: by adjusting delay capacitor C6's Size thus adjust the delay time of described delay circuit.

A kind of enhancing bass sound effect circuit the most according to claim 1, it is characterised in that: described delay circuit passes through electric capacity C8 and resistance R8 couples a signal to the input of adder, and the source of sound mixing coupled with the resistance R1 of audio input end.

A kind of enhancing bass sound effect circuit the most according to claim 1, it is characterised in that: described power amplifier and time delay Circuit all passes through filter circuit and is electrically connected with external power source VDD.