JPH0753296Y2 - Audio playback equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an audio reproducing apparatus capable of adjusting the sound quality according to the taste of the person who hears the reproduced sound.

(Prior Art) FIG. 4 shows an example of a conventional power supply circuit generally used as a constant voltage power supply for an audio reproduction circuit.

In FIG. 4, the power supply circuit 1 has an input terminal 2 connected to the output terminal of a rectifier circuit or battery (not shown), and this input terminal 2 is connected to the output terminal 4 via the collector and emitter of the transistor 3. There is. Further, a resistor 5 is interposed between the input terminal 2 and the base of the transistor 3, and this base is grounded via a Zener diode 6 and a capacitor 7 in parallel. This capacitor 7 and resistor 5
The time constant circuit is formed by. Output terminal 4
An audio reproduction circuit (not shown) is connected to.

Here, in the power supply circuit 1 shown in FIG. 4, by changing the constant of the resistor 5 or the capacitor 7 forming the time constant circuit, the sense of speed of the reproduced sound of the audio reproduction circuit connected to the output terminal 4 is sensed. It is empirically known that the sound quality such as the sound and the thickness of the sound and the position where the sound is localized by stereo reproduction change in the front-back direction. Then, generally, the constants of the time constant circuit are set so that the audio quality of each audio reproducing device becomes optimum.

The speed of sound is, for example, the sound of a drum is "don".
Or a sound that sounds like a little long “dawn” is expressed as a sense of crispness, and the thickness of the sound represents a feeling that the sound is rich or poor. There is. When the constant of the time constant circuit deviates from the optimum value to one side, the speed feeling of the sound is good but the thickness of the sound disappears, and when it deviates to the other side, the thickness of the sound becomes rich but the speed feeling of the sound tends to be lost. is there.

FIG. 5 shows an example of an audio amplifier circuit using a non-inverting amplifier circuit and a conventional power supply circuit thereof.

In FIG. 5, the positive and negative power supply input terminals of the non-inverting amplifier circuit 10 are connected to the positive and negative power supply terminals 13 and 14 via resistors 11 and 12, respectively, and
The capacitors 15 and 16 are grounded via the respective capacitors.
And resistors 11 and 12 and positive and negative power supply terminals 13 and 14
And the capacitors 15 and 16 configure the positive and negative power supply circuits 17 and 18, respectively, and the resistors 11 and 1
2 and capacitors 15 and 16 form a time constant circuit. Furthermore, the positive input terminal of the non-inverting amplifier circuit 10 is connected to the audio input terminal 19, the output terminal is connected to the audio amplification output terminal 20, the output terminal and the negative input terminal are connected by the resistor 21, and both terminals are connected. They are grounded via resistors 22 and 23, respectively.

Here, the sound quality of the signal amplified by the non-inverting amplifier circuit 10 shown in FIG. 5 is output to the audio amplifier output terminal 20 by changing the constants of the resistors 11 and 12 and the capacitors 15 and 16 which form the time constant circuit. It is empirically known that the unity of output sound changes. Then, generally, the constant of the time constant circuit is set so as to obtain an optimum sound cohesion as a single device including the audio amplifier circuit.

It should be noted that the sound unit represents a sense of sound quality in which low-pitched sound, middle-pitched sound, and high-pitched sound are heard together from the speaker or are heard separately.

(Problems to be Solved by the Invention) As described above, the constants of the time constant circuits of the power supply circuits 1, 17 and 18 are set so as to obtain the optimum sound quality in each device alone. However, when a plurality of audio playback devices such as the component type are combined, the sound quality is likely to change. For example, when a cassette player and an audio amplifier are combined, if the speed feelings of the two are slightly biased, the bias becomes more significant due to the synergistic effect. In addition, the sound quality changes depending on the acoustic conditions around the audio reproducing device, for example, the magnitude of the echo. Furthermore, the optimum sound quality differs depending on the preference of the sound to hear the reproduced sound.

However, the conventional audio reproducing device is not provided with a mechanism for adjusting the sound quality such as the above-described speed feeling of the reproduced sound, the thickness of the sound, and the cohesion of the sound. For this reason, there is a problem that the reproduced sound cannot be adjusted to a sound quality that suits the taste of the listener, and the listener cannot be sufficiently satisfied.

The object of the present invention was made in view of the circumstances of such a conventional audio reproducing apparatus, and the sound quality such as the speed feeling and the thickness of the sound and the unity of the sound are adjusted according to the preference of the person who hears the reproduced sound. It is to provide an audio reproducing device capable of performing.

(Means for Solving the Problems) In order to achieve the above object, the audio reproducing apparatus of the present invention is an audio reproducing apparatus including a power supply circuit for supplying power to the audio reproducing circuit. It is possible to adjust at least one of the resistance value of the resistor or the capacitance of the capacitor that constitutes the time constant circuit provided in the circuit, and an operation knob for adjusting this resistance value or capacitance is provided on the front panel of the device. It is characterized in that the sound quality of the reproduced sound of the audio reproducing circuit can be adjusted by the operation knob.

(Function) The operation knob arranged on the front panel allows the person listening to the reproduced sound to adjust the constant of the time constant circuit provided in the power supply circuit. You can adjust the sound quality such as the sense of speed, the thickness of the sound, and the unity of the sound.

(Description of Embodiments) Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 shows an embodiment of a power supply circuit as a constant voltage power source for an audio reproducing apparatus of the present invention, and FIG. 2 shows an operating knob for switching the capacitor shown in FIG. It is a principal part external appearance perspective view of the audio reproducing apparatus which shows an Example. In FIG. 1, the same circuit elements as those in FIG.

In FIG. 1, a resistor 5 and a variable resistor 5a are provided in series between the collector and the base of a transistor 3, and a common contact of a changeover switch 8 is connected to this base, and the respective changeover contacts are 1 μF, 10 μF, It is grounded via capacitors 7a, 7b and 7c having different capacitances of 47 μF. The operation knob 30 of the changeover switch 8 is arranged on the front panel 31 of the device as shown in FIG.

With such a configuration, a person who listens to the reproduced sound adjusts the operation knob 30, and appropriately selects the capacitors 7a, 7b, 7c, and switches the constants of the time constant circuit of the power supply circuit 1 to obtain a sense of speed and sound. It is possible to match the sound quality such as thickness to the taste of the listener.

FIG. 3 shows an embodiment of an audio amplifying circuit using a non-inverting amplifying circuit and a power supply circuit for the audio reproducing apparatus of the present invention. In FIG. 3, the same circuit elements as those in FIG. 5 are designated by the same reference numerals, and overlapping description will be omitted.

In FIG. 3, the positive and negative power source input terminals of the non-inverting amplifier circuit 10 are connected to the positive and negative power source terminals 13 and 14 respectively by connecting the variable resistors 11a and 12a to the resistors 11 and 12 in series. . The variable resistors 11a and 12a are interlocked with each other, and an operation knob 30 for adjusting the resistance value thereof is provided on the front panel 31 as shown in FIG.

Then, by adjusting the operation knob 30, it is possible to match the sound quality, such as a unit of sound, with the taste of the listener.

Needless to say, the configuration of the time constant circuit of the power supply circuit is not limited to the above embodiment. Then, examples of the audio reproducing device include a cassette player, a compact disc player, a graphic equalizer, an audio amplifier, and the like.

(Effect of the Invention) As described above, according to the audio reproducing apparatus of the present invention, the operation knob provided on the front panel adjusts the constant of the time constant circuit provided in the power supply circuit by the person listening to the reproduced sound. Since it is possible, it is possible to adjust the sound quality such as the sense of speed, the thickness of the sound, and the unity of the sound according to the taste of the person who hears the reproduced sound. In particular, there is an excellent effect that the sound quality of the reproduced sound of the entire component type device in which a plurality of audio reproducing devices are combined can be adjusted.

[Brief description of drawings]

FIG. 1 shows an embodiment of a power supply circuit as a constant voltage power source for an audio reproducing apparatus of the present invention, and FIG. 2 shows an operating knob for switching the capacitor shown in FIG. FIG. 3 is an external perspective view of an essential part of an audio reproducing device showing an embodiment, and FIG. 3 is an embodiment of an audio amplifying circuit using a non-inverting amplifying circuit and a power supply circuit for the audio reproducing device of the present invention. FIG. 4 shows an example of a conventional power supply circuit generally used as a constant voltage power supply for an audio reproduction circuit, and FIG. 5 shows an audio amplifier circuit using a non-inverting amplifier circuit and its conventional power supply circuit. This is an example. 1,17,18: Power supply circuit, 5,11,12: Resistance, 11a, 12a: Variable resistance, 7a, 7b, 7c, 15,16: Capacitor, 8: Changeover switch, 30:
Operating knob, 31: front panel.

Claims (1)

[Scope of utility model registration request] 1. An audio reproducing apparatus having a power supply circuit for supplying power to an audio reproducing circuit,
It is possible to adjust at least one of a resistance value of a resistor and a capacitance of a capacitor that form a time constant circuit provided in the power supply circuit, and an operation knob for adjusting the resistance value or the capacitance is provided on the front panel of the device. An audio reproducing device characterized in that the sound quality of the reproduced sound of the audio reproducing circuit can be adjusted by the operation knob.