KR900008803Y1 - Loudness frequency control circuit - Google Patents

Abstract

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Description

Laudinis frequency control circuit

1 is a conventional circuit diagram.

2 is a circuit diagram according to the present invention.

3 is an operation characteristic diagram for each mode according to FIG.

* Explanation of symbols for main parts of the drawings

1: voice signal input unit 2: high frequency cut-off frequency adjusting unit

3: low frequency cutoff frequency adjusting unit 4: control unit

5: variable resistor 6: voice signal output

7: Status indicator SW1: Laudiness changeover switch

The present invention relates to a loudness circuit for adjusting the loudness of an audio system, and more particularly, to a loudness frequency adjusting circuit for obtaining a user's desired sound by allowing high and low cutoff frequencies to be adjusted externally. will be.

In general, loudness refers to the volume of sound heard in the human ear, a sense of intensity stimulated when the sound reaches the ear.

At this time, the sense of the ear is not proportional to the normal sense level, but varies depending on the frequency of the sound.

FIG. 1 is a conventional luminous circuit diagram in which R1 and R2 are resistors, C1 and C2 are capacitors, SW is a switch, and VR is a variable resistor.

The operation of FIG. 1 is briefly described below.

The predetermined voice signal input through the input terminal 10 is set by the resistors R1 and C1 to have a high frequency cutoff frequency fH = The low cutoff frequency (fL) is determined by the resistances (R2) and (C2) After it is set to the variable resistor (VR) is input. The variable resistor VR adjusts the level of the input voice signal and outputs the selected system through the output terminal 20.

As described above, the conventional circuit has a problem in that the high and low cutoff frequencies are determined so that the user cannot adjust the appropriate frequency.

Therefore, an object of the present invention is to provide a high frequency cut-off frequency and low frequency cut-off frequency to the Laudinis frequency control circuit that can provide a user desired frequency by varying from the outside.

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

2 is a circuit diagram according to the present invention, 1 is a voice signal input unit for inputting a predetermined voice signal and 4 is composed of a controller P1 and a controller power switching switch SW2, and as a pulse signal is input by a user's operation. A control unit for outputting a control signal for each mode, 2 is composed of resistors (R1-R3), field effect transistors (Q1, Q2), capacitor (C1) is switched in accordance with the control signal of the control unit 4 is the voice High frequency cut-off frequency adjusting part for adjusting the high frequency cut-off frequency range of the predetermined voice signal passing through the signal input unit 1, and 3 is composed of resistors R4-R8, field effect transistors Q3 and Q4, and capacitor C2. The low frequency cut-off frequency adjusting part 2 is switched according to the control signal of the control part 4 to adjust the low frequency cut-off frequency range of the predetermined voice signal passing through the high frequency cut-off frequency adjusting part 2, and 5 is the high frequency cut-off frequency adjusting part 2. Wow me The voice signal of which the frequency range is adjusted by the cutoff frequency adjusting unit 3 is input and is a variable resistor capable of varying the signal level by the user, and 6 denotes a voice signal of which the signal level is adjusted by the variable resistor 5. The voice signal output device 7 is composed of resistors R9-R12, transistors Q5 and Q6, and light emitting diodes D1 and D2, and the state of the output of the controller 4 is classified and displayed for each mode. SW1 is composed of terminals (a, b, c) to open and close the connection between the output terminal of the high frequency cut-off frequency adjusting part (2) and the output terminal of the low frequency cut-off frequency adjusting part (3) by the user. It is possible to switch between the Ludiness switch.

3 is an operation characteristic diagram of each mode according to FIG. 2, (a) is an operation characteristic diagram of the mode (1), (b) is an operation characteristic diagram of the mode (2) and (c) is a Operation characteristic diagram.

Hereinafter, the present invention will be described in detail with reference to FIGS. 2 and 3.

When a predetermined voice signal is inputted to the voice signal input unit 1, when the terminals b and c of the luminance switching switch SW1 are connected to each other, that is, when the luminance switching switch SW1 is turned off, At this time, the input voice signal is output to the voice signal output device 6 without change through the variable resistor 5.

And when the terminals (a) and (c) of the Laudynis switching switch (SW1) is connected, that is, "on" the Laudynis switching switch (SW1), the voice signal passing through the voice signal input unit 1 is The range of the high-frequency cutoff frequency is determined by the combined resistance RH of the resistors R1, R2, and R3 and the capacitor C1, and the combined resistance RL of the resistors R4, R5, R6 is applied to the capacitor C2. This determines the range of the low cutoff frequency. On the other hand, the controller P1 outputs a control signal through the control signal output terminals Q1 and Q2 when the power supply Vcc is input to the input terminal In of the controller P1 through the controller power switching switch SW2. .

At this time, the control signal output terminal (01) = control signal output terminal (02) = "low" of the controller (P1) in the initial state at the time of power supply is referred to as the mode 1 operation. In addition, when the controller power-switching switch SW2 is "on" in the mode 1 operation state, the control signal output terminal 01 of the controller P1 is "high", and the control signal output terminal 02 is "low". It is called mode 2 operation.

In addition, when the controller power supply switch SW2 is "on" again in the mode 2 operation state, the control signal output terminal (01) = "low" control signal output terminal (02) = "high" of the controller P1. It is called mode 3 operation. In addition, when the controller power supply on / off switch SW2 is "on" again in the mode 3 operation state, the control signal output terminal 01 of the controller P1 = control signal output terminal 02 = low, that is, the operation of the mode 1 and the like. The same operation is repeated and the above operation is repeated as the controller power on / off switch SW2 is " on ".

Therefore, the output state of each mode controller P1 is shown in Table 1 below.

TABLE 1

Here, the controller P1 is a counter that repeatedly performs the modes 1, 2, and 3 as power is input to the input terminal In by a user's selection.

On the other hand, in the operation mode 1 of the controller P1, the control signal output terminal 01 = control signal output terminal 02 = low and consequently the field effect transistor Q1 = Q2 = Q3 = Q4 = off. At this time, the combined resistance (RH) = R1 + R2 + R3, the combined resistance (RL) = R4 + R5 + R6.

In operation mode 2, the control signal output terminal (01) = high and the control signal output terminal (02) = low, so the field effect transistor (Q1 = Q3 = "on"), (Q2 = Q4 = "off") In this case, the combined resistance (RH) = resistance (R1), the combined resistance (RL) = resistance (R4).

In operation mode 3, the control signal output terminal (01) = "low" and the control signal output terminal (02) = "high" become field effect transistors (Q1 = Q3 = "off"), (Q2 = Q4 = "on". ), Where the combined resistance (RH) = resistance (R1) + resistance (R2), the combined resistance (RL) = resistance (R4) + resistance (R5).

Therefore, the conversion relationship between the composite resistors RH and (RL) by the controller P1 for each mode is shown in Table (2).

TABLE 2

Therefore, as shown in Table (2), the values of the combined resistance (RH) and the combined resistance (RL) for each mode are determined, and based on these values, the high and low cutoff frequencies (fH) and low cutoff frequencies (fL) are calculated for each mode. If it is as below (3).

TABLE 3

In Table (3), the high and low cutoff frequencies (fH) and low cutoff frequencies (fL) of the modes (1), (2), and (3) are f1H, f1L, f2H, f2L, f3H, and f3L, respectively. It can be seen that there is a relationship as follows.

f1H <f3H <f2H, f1L <f2L <f3L

Summarizing the above relationship, the operation characteristic diagram for each mode can be represented as shown in FIG. 3a shows the operating characteristics of the mode 1, 3b shows the operating characteristics of the mode 3, and 3c shows the operating characteristics of the mode 2. The audio signal passing through the circuit having the characteristics described above is input to the audio signal output circuit 6 after the signal level is adjusted by the variable resistor 5.

On the other hand, the operation of the light emitting diodes D1 and D2 indicating the operation state of the present invention, when the mode (1) operation in Figure 3 (a) control signal output terminal (01) = control signal output terminal (02) = Since it is "low", the light emitting diodes D1 and D2 are "off".

In mode 2 operation, the control signal output terminal (01) is "high" and the control signal output terminal (02) is "low", so that the transistor Q5 is "on" and the light emitting diode (D1) is "on".

In the three-mode operation, since the control signal output terminal (01) is "low" and the control signal output terminal (02) is "high", the transistor Q6 is "on" and the light emitting diode D2 is "on".

As described above, the present invention has an advantage of allowing the user to arbitrarily select a desired frequency characteristic by allowing the high and low frequency to be changed externally.

Claims (4)

In the luminance frequency adjustment circuit, a control unit 4 for outputting a control signal for each mode as the pulse signal is input by a user's operation, and is switched in accordance with the control signal of the control unit 4, and the voice signal input unit ( 1) the high frequency cut-off frequency adjusting part 2 for adjusting the high frequency cut-off frequency range of the predetermined voice signal passing through the control unit; and the predetermined frequency passed through the high frequency cut-off frequency fixing part 2 by switching according to the control signal of the control part 4; A low frequency cut-off frequency adjusting part 3 for adjusting a low frequency cut-off frequency range of a voice signal, and a voice signal whose frequency range is adjusted by the high frequency cut-off frequency fixing part 2 and the low cut-off frequency adjusting part 3 are input to the user. A variable resistor 5 capable of varying the signal level, a state indicator 7 for classifying and displaying the output states of the control unit 4 for each mode, and adjusting the high frequency cutoff frequency by a user. Routine frequency adjustment, characterized in that consisting of a routing switch (SW1) that can select the original sound or the frequency control sound since the connection of the output terminal of the output section and the output terminal of the low-pass cut-off frequency adjusting section (3) Circuit. The high frequency cut-off frequency adjusting part 2 adjusts the high frequency cut-off frequency range according to the switching of the first switching means and the switching of the first switching means. A circuit comprising: a high frequency cutoff frequency range adjusting means. 2. The low switching frequency adjusting unit (32) according to claim 1, wherein the low switching frequency adjusting unit (32) adjusts the low switching frequency range in response to switching of the second switching means and the second switching means switched in response to a control signal input from the control unit (4). And a low pass frequency range adjusting means. According to claim 1, wherein the control unit 4 is composed of a controller power switch (SW2) that is opened and closed by a user and a counter (P1) for outputting a predetermined control signal by the opening and closing operation of the controller power switch (SW2). Circuit characterized in that.