KR810000992Y1 - Single control power-frequency control circuit - Google Patents

Abstract

No content.

Description

Single Control Power Frequency Control Circuit

1 is a schematic diagram of an improved single control power-frequency control circuit device according to the present invention.

2 is a perspective view of a mechanical control device external to the entertainment apparatus using the control circuit shown in FIG.

3 is a graph showing the frequency versus amplitude characteristics of an audio signal.

4 is a schematic diagram of another power-frequency control circuit including the circuit of FIG. 1 suitable for use in a stereo entertainment device.

The present invention relates to the field of tone and volume control circuits for audio frequency entertainment devices, in particular an improved single control power-frequency circuit suitable for use in controlling audio electrical signals in automobile rides and tape players. It is about.

In entertainment devices such as radios and tape players, it is desirable to reduce the number of tuning controls to a minimum so that the operator can simply adjust the device to obtain the desired operating mode.

A separate tuning controller is commonly used to control the volume and tone of the audio signal. The controller includes a continuous variable potentiometer that functions independently of each other. In addition, most entertainment devices have ancillary controllers for strengthening the high or low ends of the frequency spectrum of the final audio signal generated by the entertainment device. This secondary controller is usually called a "booster" circuit. These booster circuits are provided for selectively strengthening the frequency range of the audio signal, while maintaining a constant amplitude of the audio signal in the non-strong frequency range. In order to complete this frequency boost, the conventional circuit uses a complicated and expensive tuning circuit using an expensive multitape potentiometer.

These conventional booster circuits have ignored the fact that the operator of the entertainment device operates the booster circuit to increase the brilliance of the voices coming from the device. Therefore, in practice, the operator of the radio first operates the conventional booster circuit and then adjusts the volume controller of the radio to obtain a large audio signal over all audio frequency ranges.

These separate tuning operations make the dynamic sound of the audio sound desired by the operator. The conventional circuit has been thoroughly prevented from increasing the audio level every time the frequency booster circuit is operated. Therefore, two tuning operations are always necessary.

This incidental tuning behavior bothers the driver of the car trying to tune the car radio while driving. The driver of the vehicle needs a simple tuning controller that quickly obtains the desired operating mode from the audio frequency entertainment device in the vehicle. This need primarily concerns the development of push button car radios. However, the automatic tone control device did not know that when the operator wanted to strengthen the bass or treble range of the audio frequency device, the operator wanted to increase the overall voice of the audio signal over all audio frequency ranges.

It is an object of the present invention to provide an improved and simplified control circuit which is very suitable for use in controlling audio electrical signals.

Another object of the present invention is to provide an improved single control circuit which is very suitable for use in an audio automobile entertainment apparatus.

One embodiment of the present invention has an improved single control power-frequency control circuit, which receives and outputs a first terminal, a second terminal, and an audio signal for receiving an audio input signal over an audio frequency range. It consists of an adjustment control device connected between the first and second terminals to provide a modified audio signal to the two terminals, the control device being modified simultaneously while increasing the size of the modified audio signal over the audio frequency range. Provides a single adjustment to selectively intensify any frequency within the audio frequency range within the signal.

A preferred embodiment of the present invention consists of a mechanically adjustable tone control device, a volume control device and an audio booster circuit. The tone control and volume controllers include separate potentiometers and the audio booster circuit consists of a parallel resistor-capacitor combination and a switch connected between the end terminal of the volume control potentiometer and the moving suppression. Therefore, when the booster circuit switch operates, it changes the effective resistive setting of the volume potentiometer by connecting a resistor in parallel with a part of this potentiometer, while simultaneously connecting a capacitor in parallel with a part of the same potentiometer. Intensify the audio frequency. Therefore, the simplified volume and tone controllers simultaneously strengthen certain audio frequencies while varying the magnitude of the audio signal over all audio frequency ranges.

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

FIG. 1 shows a volume control circuit which is very suitable for use in controlling an audio electrical signal of an automatic entertainment apparatus. This circuit comprises a tone control circuit 11 connected to a volume control circuit 12 connected to an audio booster circuit 13, which circuits are shown in a dashed rectangle.

The tone control circuit 11 includes a capacitor 14 connected between the audio input terminal 15 and the internal terminal 16. Terminal 16 is connected to ground via a resistor on the potentiometer 17 with a regulator voltage 18 directly connected to ground. Capacitor 14 and potentiometer 17 constitute tone control circuit 11 that operates as a variable high frequency attenuator. Since the moving magnetic pressure 18 moves toward terminal 16, an additional high frequency attenuation is obtained, effectively strengthening the bass frequency portion of any audio signal indicated at input terminal 15. Likewise, the movement of the moving magnet pressure 18 away from terminal 16 effectively provides a large resistance between this terminal and ground, thereby reducing the amount of high frequency attenuation that effectively strengthens the high frequency of the audio signal at terminal 14.

The volume control circuit 12 includes a potentiometer 20 having a resistor connected between the input terminal 15 and ground and an adjustable movable pressure 21 directly connected to the audio output terminal 22. The volume control circuit 12 therefore comprises an adjustable voltage divider which provides an audio output terminal 22 having a predetermined percentage of the audio signal appearing at terminal 15.

This percentage is determined by the position of the movable arm 21 and is virtually independent of the frequency of the signal at terminal 15.

The booster circuit 13 is a resistor 22 in parallel with the capacitor 23 connected between the audio terminal 15 and the movable arm 21 by a switch 24 having a contact arm 25 operating between a resistor 22 and a terminal 27 connected to the capacitor 23 and a separate terminal 26. It includes. By means of the contact arm 25 connected between the movable arm 21 and the terminal 27, the booster circuit 13 acts as a fixed high frequency frequency bypass for the audio signal appearing at the input terminal 15. Therefore, in this state, the audio frequency output terminal 22 receives a large percentage of high frequency audio signals. Resistor 22 is also connected in parallel with the resistive element section of potentiometer 20 between mover arm 21 and audio input terminal 15. This increases the magnitude of the audio signal present at output 22 over all audio frequency ranges. Therefore, moving the contact arm 25 from the disconnect terminal 26 to the terminal 27 selectively enhances the high frequency at the output terminal 22, and at the same time changes the magnitude of the audio signal appearing at the terminal 22 over the entire audio frequency range. Therefore, the present invention is equipped with a single operator arm switch device which instantaneously changes the magnitude of the audio output signal through the audio frequency range and strengthens the high frequency component of the audio output signal.

FIG. 2 shows a control panel 30 having a mechanically adjustable controller designed to operate the circuit shown in FIG. Rotatable tone control knob 31 is shown to control the movement of movable arm 18 of potentiometer 17. Rotatable volume control knob 32 is shown to control the position of the movable arm 21. Slide switch 33 is shown capable of operating between the off and on positions and is adapted to control the movement of contact arm 23 between terminals 26 and 27, respectively. The mechanical structure shown in FIG. 2 therefore provides a single operator power-frequency controller having at least two predetermined set positions when used in connection with the electrical circuit shown in FIG. This controller provides a simple and effective tone control circuit that, when operated, instantly increases the magnitude of the audio signal appearing at terminal 22 over the audio frequency range, while strengthening the selected portion of the audio frequency range.

3 shows a typical audio signal amplitude versus frequency response 35 at terminal 22 before booster circuit 13 operates. Also shown in FIG. 3 is an amplitude versus frequency response 36 (shown in dashed lines) that exists after the booster circuit operates. The audio frequency range f ₁ -f ₂ is usually 50 to 10.000 Hz. Therefore, FIG. 3 shows that when circuit 13 operates, the magnitude of all frequency spectrums changes and the selected portion of the spectrum becomes strong.

4 shows stereo volume, tone and balance control device 40. As shown in FIG. In the device 40, the right channel audio input terminal 41 is connected to the right channel audio output terminal 42 by the tone control circuit 43 (shown in dashed lines), the volume control circuit 44 (shown in dashed lines) and the boost circuit 45 (shown in dashed lines). Is connected to. The circuits 43, 44 and 45 are the same as the respective circuits 11, 12 and 13 shown in FIG. 1 and form the same control circuit as the control circuit 10. As shown in FIG. The left channel audio input terminal 51 is connected to the left channel audio output terminal 52 by the same circuits 53, 54 and 55 as the circuits 43, 44 and 45. The mover arm of control circuits 43 and 53, the mover arm of control circuits 44 and 54 and the contact arm of boost switch circuits 45 and 55 are shown as organized together to form a right and left controller that are mechanically fitted together. The right audio output terminal 42 is connected to the left audio output terminal 52 by a resistance element of the potentiometer 56 having an adjustable mover arm 57 directly connected to ground. Components 56 and 57 form a balance control circuit 58 (shown in dashed lines) that provides an adjustable controller to determine the relative intensity of the audio signal appearing at output terminals 42 and 52. The movable arm 56 is positioned by separate mechanically adjustable control knobs that lie along the sides of the control knobs 31, 32 and 33 designed to control the respective stereo tones, volume and boost circuits.

In a preferred embodiment of the present invention, a booster circuit is connected between the audio input terminal 15 and the movable arm 21. By placing the booster circuit in this position, all of its effects are increased during the low level setting of the volume controller 12. When the volume controller is turned up, the effect of the booster circuit is gradually minimized. This prevents the burst of loud audio speech from being overwhelmed when the booster circuit 13 is operated and the volume control circuit 12 is already set to a high audio signal level.

Therefore, the present invention provides a simplified control device in which a mechanically adjustable controller with a single moving part is simply used to strengthen certain portions of the audio frequency spectrum while simultaneously increasing all the magnitudes of the audio signal over the audio frequency spectrum. Equipped. Although specific embodiments of the present invention have been described so far, those skilled in the art can modify and modify the present invention within the limits without departing from the scope of the present invention. For example, an electronically adjustable control element may be substituted for the mechanically adjustable control elements 31, 32 and 33.

Embodiment of this invention is as follows.

1. a tone control device for selectively strengthening a frequency within an audio frequency range of an audio signal, a volume control device connected to the tone control device for selectively determining a magnitude of the audio signal through an audio frequency range, and the audio And an audio boost circuit device coupled to said volume control device for selectively intensifying any frequency of the signal and for instantaneously increasing the magnitude of the audio signal over an audio frequency range.

2. The volume control device includes a mechanically influenceable and adjustable movable arm of the resistance element, the boost circuit device includes a resistance device and a capacitance device connected in parallel with each other, and the volume control device movable arm and the volume control device. An improved control circuit comprising a switch device for selectively coupling said parallel connected resistor and capacitor device between one end of a device resistance element.

3. The tone control device includes a resistor connected in series to a capacitor, wherein at least one of the resistor and the capacitor is variable, wherein the series connected resistor and the capacitor device are connected in parallel with the volume control device resistance element. .

4. The control circuit comprising a first mechanical device, a series resistor and a capacitor, for the tone control device to change the electrical size of at least one of the resistor and the capacitor.

5. An improved control circuit comprising a potentiometer in which the tone control device is mechanically affected and has an adjustable movable arm.

6. An improved control circuit comprising a potentiometer in which the volume control device is mechanically influenced and has an adjustable movable arm.

And wherein said boost circuit arrangement comprises a switch, a resistor and a capacitor.

7. An improved control circuit in which the resistor and capacitor in the boost circuit are electrically connected by the switch between the movable arm of the volume potentiometer and one end of the resistance element.

8. An improved control circuit in which the boost circuit capacitor and the resistor are connected in parallel with each other.

9. An improved control circuit wherein the tone control potentiometer has a movable arm electrically mentioned at one end of the resistance element.

Claims (1)

A single control power-frequency control circuit suitable for use in controlling an audio electrical signal in an automobile entertainment apparatus as described herein and shown in the drawings, comprising: a first control for receiving an audio input signal over an audio frequency range; The audio frequency range in a modified audio signal connected between a first terminal and a second terminal, and a first terminal and a second terminal to provide an audio signal modified at the second terminal and to receive the audio signal, and through an audio frequency range. A single control power-frequency control circuit, comprising an adjustable control having a single regulator for selectively intensifying any frequency within.