JPS5824494Y2 - sound equipment - Google Patents

Description

[Detailed Description of the Invention] It is an object of the present invention to provide an apparatus that can obtain preferable acoustic effects, particularly regarding the configuration of the sound quality and volume adjustment section of an audio apparatus such as a stereo or television receiver.

When it comes to buttons on audio equipment, the sound quality adjustment and volume adjustment are usually adjusted completely separately, or they are designed to increase the low and high range parts of the audio signal when the volume is decreased. ing.

However, when adjusting the sound quality, the volume adjustment is done using a fixed IK, so when you adjust the sound quality, you may feel that the volume increases or decreases accordingly, or conversely, you may feel that the effect of the sound quality adjustment is small. There were some drawbacks.

Therefore, the present invention solves such conventional drawbacks and can automatically adjust the volume so that the volume perceived by the ears does not change even if the sound quality is adjusted, or when the sound quality is adjusted. It is an object of the present invention to provide an audio device that can make the sound quality change effect feel larger and can produce preferable acoustic effects.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the figure, 1 is an input terminal for an audio signal, 2 is a preamplifier circuit that amplifies the input audio signal, and the amplified audio signal is sent to a volume adjustment circuit 3 that adjusts the size of the audio signal. Sound quality adjustment having a low frequency adjustment circuit 5 that increases or decreases the magnitude of only the low frequency component and a high frequency adjustment circuit 6 that increases or decreases the magnitude of only the high frequency component after adjusting the volume by increasing or decreasing the magnitude. Supplied to circuit 4.

3a is a variable resistor for adjusting the volume, and 5a and 6a are variable resistors for adjusting the increase/decrease of the low frequency component and the high frequency component, respectively.

The sound signal whose sound quality has been adjusted by the sound quality adjustment circuit 4 is amplified by the amplifier circuit 7 and supplied to the speaker 8 to generate sound.

Furthermore, in this device, the sound quality adjustment signals are taken out from the low frequency adjustment circuit 5 and the high frequency adjustment circuit 6 of the sound quality adjustment circuit 4, added in the adding circuit 9, and then added to the volume adjustment circuit 3. Along with volume adjustment using resistor 3a,
Variable resistor 5a.

6a, the volume is automatically adjusted accordingly.

FIG. 2 shows a more specific circuit example of such a volume and sound quality adjustment device. Here, the volume adjustment circuit 3 is a differential amplifier composed of transistors 3b to 3e, and transistor 3b is used as a differential amplifier.
, 3d by changing the pace voltage with a variable resistor 63a, and the low frequency adjustment circuit 5 includes transistors 5b to 5g and capacitors 5h,
5i and resistors 5j, 5k, the base voltage of transistors 5b, 5f is controlled by a variable resistor 5a.
The high frequency adjustment circuit 6 uses a differential amplifier made up of transistors 6b to 6g, capacitors 5h and 6tk, and resistors 6i and 6kK. By changing the pace voltage of the transistors 6b and 6f using a variable resistor 6a, the magnitude of the high frequency component is adjusted to increase or decrease.

These differential amplifiers for volume adjustment and sound quality adjustment are connected in cascade.

Further, in the adder circuit 9, two transistors 9a and sb
A voltage for adjusting the sound quality from the variable resistors 5a and 6a is applied to the base of each of the variable resistors 5a and 6a, an inverted addition voltage is taken out from the common resistor 9c of the collector, and this is applied to the 2 in the volume adjustment circuit 3 via the transistor 9d. transistor 3
In addition to the base of the transistor 3f, one of the transistors f and 3g, the transistor 3b is added to the volume adjustment voltage from the variable resistor 3a.

Added to the 3D base.

This allows the variable resistors 5a and 6a to adjust the sound quality.
Transistor 3b of volume adjustment circuit 3
, 3D pace voltage can be changed, and the volume can also be adjusted automatically.

In the apparatus of the embodiment shown in FIG. 2, at least one of the variable resistors 5a and 6a for low frequency adjustment and high frequency adjustment is adjusted to increase the voltage, so that at least one of the low frequency component and the high frequency component is adjusted. If the component is also increased, the output voltage of the adder circuit 9 also increases in an inverted state, and the volume adjustment circuit 3 is automatically adjusted to reduce the volume.

On the other hand, when the variable resistors 5a and 6a are adjusted to reduce at least one of the low-frequency and high-frequency components, the volume is automatically adjusted to increase by changing the voltage in the opposite direction.

Therefore, when adjusting the sound quality using the variable resistors 5a and 6a while listening to music etc. using the device shown in Fig. 2, it is possible to adjust the sound quality by increasing or decreasing the low-frequency components or high-frequency components. On the contrary, the volume decreases or increases, and to the ear it always sounds like a constant volume,
A favorable acoustic effect can be obtained when stabilizing the volume is required.

On the other hand, if the voltage output terminal of the adder circuit 9 in the device shown in FIG. 2 is changed from the emitter of the transistor 9d to the collector as shown in FIG.
, when adjusting the sound quality in step 6a to increase or decrease the low frequency component or high frequency component, the volume can also be automatically increased or decreased accordingly, in this case. can further emphasize the adjustment of sound quality by changing the volume.

Therefore, if it is desired to improve the sound quality adjustment effect even if the volume is not constant, excellent acoustic effects can be obtained by configuring as shown in FIG. 3.

In addition, in this device, even when the volume is adjusted by changing the variable resistor 3a, the voltage change is caused by the transistor 3.
Since the signal is not transmitted from the collector or emitter to the base side in g, 9c, 9a, and 9b, the sound quality does not change at this time.

Further, in the above-described embodiment, both the low-frequency component and the high-frequency component are adjusted, but it goes without saying that a sound quality adjustment circuit that adjusts only one of the components may be used.

Therefore, according to the audio device of the present invention, the volume can be automatically adjusted according to the sound quality adjustment, so even if the sound quality is adjusted, the volume heard by the ears remains constant, allowing stable listening. The sound quality adjustment effect can be further emphasized by increasing or decreasing the volume in accordance with the increase or decrease of the low frequency component or the high frequency component due to the sound quality adjustment, and furthermore, the sound quality can be changed when adjusting the volume. It is possible to obtain extremely effective and excellent acoustic effects, such as being able to adjust the volume without any noise.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an audio device according to an embodiment of the present invention, FIG. 2 is a detailed circuit diagram of the same device, and FIG. 3 is a circuit diagram of an audio device according to an embodiment of the present invention. 1...Input terminal, 2...Preamplifier circuit, 3...Volume adjustment circuit, 3a...Variable resistor for volume adjustment, 4. ...Sound quality adjustment circuit, 5
...Low frequency adjustment circuit, 5a... Variable resistor for low frequency adjustment, 6... High frequency adjustment circuit, 6a.
...Variable resistor for high frequency adjustment, 7...Amplification circuit, 8...Speaker, 9...Addition circuit.

Claims (1)

[Scope of utility model registration request] A differential amplifier for adjusting the volume and a differential amplifier for adjusting the sound quality are connected in cascade, a variable voltage for adjusting the volume is added to the base of the differential amplifier for adjusting the volume, and a variable voltage for adjusting the sound quality is applied to the base of the differential amplifier for adjusting the sound quality. In addition to the pace of differential amplifier for adjustment,
An audio device in which the variable voltage for adjusting the sound quality is added to the pace of the transistor, taken out from the collector or emitter of the transistor, and applied to the base of the differential amplifier for adjusting the volume.