KR910004669Y1 - Low sound compensation circuit - Google Patents

Abstract

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Description

Bass sound quality compensation circuit

1 is a block diagram according to the present invention.

2 is a detailed circuit diagram of FIG. 1 according to the present invention.

* Explanation of symbols for main parts of the drawings

1: Bass Separator 2: Low Buffer

3: low pass filter AMP1: low pass amplifier

AMP2: Main Amplifier SP1: Bass Speaker

SP2: Main Speaker

The present invention relates to a basal sound quality compensation circuit of audio, and in particular, a circuit for minimizing the variation of the main sound due to the change of the bass sound by separating the bass signal from the stereo sound input through a predetermined channel at the output of the tone circuit. It is about.

In general, for the purpose of high fidelity, to faithfully reproduce the bass, the loudness of the loudspeaker must be increased, and when the loudness of the loudspeaker is increased, faithful reproduction of the high pitch is difficult.

Thus, bass, treble or midrange transmissions constitute a speaker system that uses two or more speakers.

In the amplifier circuit used in the conventional audio, since the bass amplifier signal and the main amplifier signal are not separated, it is difficult to obtain accurate sound because the sound of the main amplifier is changed when the user adjusts the sound of the bass amplifier.

Accordingly, an object of the present invention is to provide a circuit capable of minimizing the change of the main sound due to the change of the low sound by separating the output stereo sound of the tone circuit input into a predetermined channel into the low sound and the main sound.

Hereinafter, with reference to the accompanying drawings will be described in detail.

1 is a block diagram according to the present invention, a bass separation unit 1 for separating bass from an output stereo sound of a tone circuit, and a low pass buffer acting as a buffer by a low range signal output from the bass separation unit 1. The low pass filter unit 3 which inputs the signal output to the unit 2, the low pass buffer unit 2 to attenuate the high pass component and passes the low pass component, and the signal output from the low pass filter unit 3. By the bass amplifier AMP1 to be amplified by, the bass speaker SP1 output by the audible sound by the signal output from the bass amplifier AMP1, and the second signal output by the separation circuit section 1. A main amplifier AMP2 to be amplified and a main speaker SP2 to be output as an audible sound by the signal output from the main amplifier AMP2.

When the output signal of the tone circuit is input to the bass separation section 1 through the first channel 10 and the second channel 20, the bass separation section 1 outputs the low range signal to the low-pass buffer section (2). At the same time, the output signal of the tone circuit is output to the main amplifier AMP2.

The output signal of the main amplifier AMP2 is output as an audible sound through the main speaker SP2, the buffered buffer input to the low pass buffer unit 2 is input to the low pass filter unit 3, and the low pass filter unit. In (3), the high frequency component is attenuated, and the low frequency component is passed through the bass amplifier AMP1 and the bass speaker SP1 to be output as an audible sound.

A transistor Q1 that amplifies the audio signal of the first channel 10 through the coupling capacitor C1 and inverts the audio signal, and supplies a predetermined voltage to the first node 7 of the collector terminal of the transistor Q1. A resistor R1 connected between the power supply line 19 and supplying a bias resistor, a resistor R2 and a transistor supplying a current input to the first node 17 to the base of the transistor Q1. Transistor connected between the emitter and ground of Q1) to determine the buffer level and the audio signal of the second channel 20 to the base through the coupling capacitor C2, amplified and outputted at the same time, and inverted. A resistor R3 and a second connected between Q2 and a second node 18 on the collector side of the transistor Q2 and a power supply line 19 for supplying a predetermined voltage to supply the biaser on the collector side. The current flowing into the node 18 is transferred to the transistor of the transistor Q2. Resistor R4 to be supplied to the switch, resistor R6 connected between the emitter of transistor Q2 and ground to determine the level of the buffer signal, and coupling capacitor C4 at the emitter of transistor Q1. Resistor (R7) to reduce the current input through the), resistor (R8) to reduce the current input through the coupling capacitor (C5) at the emitter of the transistor (Q2), the resistor (R7) and the A bass separator 1 comprising a capacitor C7 connected between the output line 20 connecting the coupling point of the resistor R8 and the ground to low-pass filter the signal output from the output line 20, and The collector is connected between a transistor Q3 for impedance matching with a collector side by inputting a signal through a capacitor C7 as a base, and a power supply line 19 for supplying a predetermined voltage to the collector side of the transistor Q3. Resistor R10 for supplying a bias on the side; The level of the buffer signal is connected between the resistor R9 for supplying the current applied to the collector of the jistor Q3 to the base of the transistor Q3 and the emitter side third node 21 of the transistor Q3 and ground. A low-pass buffer portion 2 composed of a resistor R11 for determining a resistance, a resistor R12 connected in series with the third node 21 to serve as a low pass filter, and a capacitor C9 connected in series with the resistor R12. ), A resistor R13 connected between the resistor R12 and the capacitor C9 and the ground connected to the fourth node 22 and ground to low-pass filter the signal output from the fourth node 22, and the A transistor C4 and a transistor Q4 that serve as a buffer by inputting a capacitor C8 connected in series to a resistor R13 and a coupling point of the resistor R13 and the capacitor C8 as a base. The collector side connected between the collector and the power supply line 19 for supplying a predetermined voltage. Is connected between a resistor R15 for supplying power for determining an urgent power level, the other end of the capacitor C9, and the fifth node 23, which is a coupling point of the collector side of the transistor Q4, and ground; The output resistor (R14) for buffering the signal output from the emitter of the transistor (Q4) and the ground through the coupling capacitor (C10) at the fifth node point 23 can be adjusted to the user desired volume A low-pass filter section 3 comprising a variable resistor VR1, a coupling capacitor C11 connected directly to the variable resistor VR1, and a low-end amplifier amplified by a signal output from the low-pass filter section 3; AMP1, a bass speaker SP1 outputting audible sound by the signal output from the bass amplifier AMP1, and a main amplifier amplifying by the output signal of the tone circuit output from the bass separation section 1; AMP2) and the output from the main amplifier AMP2. The main speaker SP2 outputs an audible sound by the left speaker L inputted through the coupling capacitor C12 and the right speaker inputted through the coupling capacitor C13.

Therefore, when the output signal of the tone amplifier is input through the first channel 10 and the second channel 20, the signal through the first channel 10 is input from the capacitor C1 to the base of the transistor Q1, The signal divided by the resistor R1 and the bias resistor R2 in the collector of the transistor Q1 is inverted and amplified, and then the coupling capacitor C3 is input to the main amplifier AMP2 to receive a signal through the second channel 20. Since is input from the capacitor (C2) to the base of the transistor Q2, the signal divided by the resistor (R3) and the bias resistor (R4) in the collector of the transistor (Q2) is inverted and amplified and then the main through the coupling capacitor (C6) Input to the amplifier (AMP2), amplified by the main amplifier (AMP2) and then audible sound output from the main speaker (SP2), the signal output from the emitter of the transistor (Q1) is a resistor through the coupling capacitor (C4) Output to (R7).

The signal output from the emitter of the transistor Q2 is output to the resistor R8 through the coupling capacitor C5.

After the signals output from the resistors R7 and R8 are synthesized at the third node 20, the high frequency is attenuated by the capacitor C7 and the low frequency passes.

Output signal (Vo) =

Output frequency (f2) =

The signal output from the capacitor C7 is input to the base of the transistor Q3 to perform impedance matching of the signal level of the collector terminal and the signal of the base terminal of the transistor Q3.

The signal output from the emitter of the transistor Q3 is low pass filtered by the resistor R12 and the capacitor C9 and then low pass filtered by the resistor R12 and the capacitor C9, and then the resistor R13 and the capacitor ( The low pass filtering is performed again by C8). The two-stage low-pass filtered signal is inputted to a variable resistor VR1 for controlling a desired volume through a transistor Q4 serving as a buffer, and then amplified by the low-pitched amplifier AMP1 through a coupling capacitor C11. After output from the bass speaker (AP1) as an audible sound,

As described above, by extracting and amplifying only low-band signals among stereo sounds output to the tone circuit, the main amplifier signal is not affected and flat audio sounds can be heard by compensating only low-tone signals. There is an advantage.

Claims (3)

In the bass sound quality compensation circuit of audio provided as a bass amplifier, a bass speaker, a main amplifier, and a main speaker, a bass separation section (1) for separating bass from the output stereo sound of the tone circuit, and in the bass separation section (1) It consists of a low pass buffer section (2) for buffering the output signal by the low pass signal, and a low pass filter section (3) for attenuating the high pass component by inputting the signal output from the low pass buffer section (2) Circuit characterized in that. The method of claim 1, wherein the bass separator 1 inputs the voice signal of the first channel 10 from the first channel 10 and the second channel 20 through the coupling capacitor C1 and buffers it. The resistor R1 and the first node 17 which are connected between the output transistor Q1, the first node 17 of the transistor Q1, and the power supply line 19 supplying a predetermined voltage, are biased and supplied. A resistor (R5) connected between a resistor (R2) for supplying a current input to the transistor (Q1), an emitter of the transistor (Q1), and a ground to determine a level of a buffer signal, and the second channel ( A connection between a transistor Q2 for inputting and buffering the audio signal of the 20 through the coupling capacitor C2 and a power supply voltage 19 for supplying a predetermined voltage to the second node 18 of the transistor Q2. And a resistor R3 for supplying a bias to the collector side of the transistor Q2 and the second node 18. A resistor R6 for supplying a current supplied to the base of the transistor Q2, a resistor R6 connected between the emitter of the transistor Q2 and ground to determine a level of a buffer signal, and the transistor Q1; Resistor R7 reduces the current input through coupling capacitor C4 at the emitter of < RTI ID = 0.0 >) < / RTI > and resistor R8 reduces the current input through coupling capacitor C5 at the emitter of transistor Q2. And a capacitor (C7) for globally filtering the signal output from the output line (20) by the resistors (R7, R8) and capacitor (C7). 2. The transistor (3) of claim 1, wherein the low pass buffer unit (2) is input through the capacitor (C7) for impedance matching and a power supply line (19) for supplying a predetermined voltage to the transistor (Q3). A resistor R10 connected between the resistor R10 for supplying the bias of the transistor Q3, and a resistor R9 for supplying the applied current of the transistor Q3 to the base of the transistor Q3 and the transistor Q3. And a resistor (R11) connected between the emitter side third node (21) and ground to determine the level of the buffer signal.