CN2343730Y

CN2343730Y - Passive frequency divider

Info

Publication number: CN2343730Y
Application number: CN 98234609
Authority: CN
Inventors: 何城郭
Original assignee: Individual
Current assignee: He Chengguo
Priority date: 1998-07-01
Filing date: 1998-07-01
Publication date: 1999-10-13
Anticipated expiration: 2008-07-01

Abstract

The utility model relates to a passive frequency divider for a sound box. A bass frequency dividing network comprises two groups of lowpass filter circuits which are connected in parallel with a signal input end and are respectively independent. Frequency dividing points of the two groups of circuits are equal to 250-90Hz or so. A bass section of a power voice frequency is divided into two parts by the two groups of circuits according to the frequency dividing points, and is transmitted to different bass loudspeakers to be played. Therefore, the utility model avoids surplus vibration caused by the phenomenon that signals of the whole bass section are played by one loudspeaker, and voice quality is improved.

Description

Passive frequency divider

The utility model relates to a kind of passive frequency divider that is used for audio amplifier.

Mostly the existing passive frequency divider that is used for audio amplifier is high and low sound two divided-frequency or high, medium and low tri-frequency divider, and the signal that this type of frequency divider will hang down segment is all distributed to the bass horn of or several parallel connections and play.Usually, the moving shape scope of the bass signal that 150HZ is above is little, and the moving shape scope of the supper bass signal below the 150HZ is bigger, this just makes loudspeaker be difficult to take into account the vibration requirement of each frequency when resetting these signals, be easy to generate unnecessary vibration, produce and drag sound, make the music distortion.

The purpose of this utility model provides a kind of bass horn that can make and avoids producing the passive frequency divider that sound is dragged in aftershock because of above-mentioned reason.

The utility model is achieved in that passive frequency divider is made up of a signal input part and a set of division network.Dividing network comprises one group of bass dividing network.The bass dividing network is divided into and is connected in parallel on signal input part, two groups of low-pass filter circuits independently separately, and its part-frequency point is about 250～90HZ.These two groups of low-pass filter circuits are divided into higher bass signal of frequency and the lower supper bass signal of frequency with the low segment in the input signal, exporting to different loudspeaker respectively resets, therefore can avoid resetting whole bass segment signal and sound is dragged in the aftershock that produces, improve tonequality by loudspeaker.

The utility model has the advantages that: the signal frequency range that exports each bass horn to is narrower, reduced requirement to the bass horn Hz-KHz, therefore and, reduced the danger of when playing big dynamic bass signal, burning voice coil loudspeaker voice coil because each bass horn is only born a part of bass signal power.

Fig. 1 is circuit theory diagrams of the present utility model.

The utility model is described in further detail below in conjunction with drawings and Examples.

Referring to Fig. 1, be high, middle pitch dividing network partly beyond the frame of broken lines among the figure, frame of broken lines is the bass dividing network with in.Circuit structure high, the middle pitch dividing network is identical with existing frequency divider, and the part-frequency point between middle pitch dividing network and the bass dividing network can be according to the actual mediant trumpet Hz-KHz value of selecting for use.The bass dividing network of this frequency divider is made up of low-pass filter circuit 1,2, and two parts circuit is connected in parallel on the input S1 of frequency divider, and part-frequency point is value in 250～90HZ scope.Wherein, low-pass filter circuit 1 is by the capacitor C 1, the inductance L 1 that are serially connected in the electric loop, and capacitor C 2 compositions that are attempted by output S2; Low-pass filter circuit 2 is made up of the inductance L 2 that is serially connected in the electric loop.The power audio signal is from input S1 input frequency divider, bass segment signal wherein is low pass filtering circuit 1,2 separated into two parts, the bass signal that is higher than part-frequency point is through 1 output of low pass electrofiltration wave circuit, the amplitude of this part signal is little usually, the supper bass signal that is lower than part-frequency point is through low-pass filter circuit 2 outputs, and the amplitude of this part signal is bigger usually.Play because this two-part signal divides by different bass horns, therefore effectively avoided playing the unnecessary vibrations that produced, improved tonequality with same bass horn.In addition, the capacitor C 1 in the low-pass filter circuit 1 can be in 120～200 μ F scopes value, make the attenuation rate at its lower-cut-off frequency place be-3dB/OCT, than common design-attenuation rate of 12dB/OCT is more smooth.Can make this circuit export more effective power like this, more effectively drive loudspeaker.If the loudspeaker that connect are to be not less than 8 inches heavy caliber loudspeaker, can and connect the impedance compensation circuit that composes in series by electric capacity, resistance at the output of this partial circuit, make its impedance curve more smooth.In low-pass filter circuit 2, because its input is in parallel with low-pass filter circuit 1, the bass signal major part that is higher than part-frequency point has been low pass filtering circuit 1 bypass, even therefore the upper limiting frequency of low-pass filter circuit 2 is located at about 150HZ, also need not to adopt the filter coil of big inductance quantity, can avoid using of the influence of the above big inductance of ten milihenries like this tonequality.In the present embodiment, L2 can be in 2～7mH scope value.The value of above-mentioned capacitor C 1, inductance L 2 is suitable for the loudspeaker that impedance is 8 Ω, if select the loudspeaker of other impedances for use, available existing computational methods are done suitably to adjust.

Claims

1, the passive frequency divider of a kind of audio amplifier, form by a signal input part and a set of division network, dividing network comprises one group of bass dividing network, it is characterized in that the bass dividing network is divided into is connected in parallel on signal input part, independently two groups of low-pass filter circuits (1), (2) separately, and the part-frequency point between two parts circuit is 250～90HZ.

2, passive frequency divider according to claim 1 is characterized in that low-pass filter circuit (1) by the capacitor C 1, the inductance L 1 that are serially connected in the electric loop, and capacitor C 2 compositions that are attempted by output S2; Low-pass filter circuit (2) is made up of the inductance L 2 that is serially connected in the electric loop.

3, passive frequency divider according to claim 2 is characterized in that capacitor C 1 value in 120～200 μ F scopes in the low-pass filter circuit (1).

4, passive frequency divider according to claim 2 is characterized in that at the output of low-pass filter circuit (1) and connects the impedance compensation circuit that is composed in series by electric capacity, resistance.

5, passive frequency divider according to claim 2 is characterized in that inductance L 2 value in 2～7mH scope in the low-pass filter circuit (2).