JPS60261297A - Automatic sound volume controller of acoustic device on vehicle - Google Patents

Abstract

PURPOSE:To control effectively the sound volume in accordance with the variance of noise between vehicle stop and running by controlling the output of a preamplifier with a control signal obtained by integrating a speed signal and a running state detection signal. CONSTITUTION:A running operation means 6 consisting of a neutral switch 10 and a clutch switch 11 outputs the running state detection signal. This detection signal value is set to a value smaller than a prescribed value when a vehicle is stopped, and the detection signal value is set to a value larger than the prescribed value when the vehicle is run, and the detection signal value is inputted to an integrator 23. This detection signal is integrated together with an engine rotation speed detection signal from an igniter 8, and the control signal proportional to the engine rotative speed is outputted and is inputted to an integrator 21 when the vehicle is stopped, and the control signal obtained by adding the engine rotative speed and a whizz proportional to this rotative speed is outputted and is inputted to the integrator 21 when the vehicle is run. The integrator 21 integrates the output of the preamplifier 1 controlled by a volume 7 and the control signal and supplies the output to a main amplifier.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to an automatic volume control device for a vehicle-mounted audio system that can always provide an appropriate volume for noise generated by running a vehicle.

(Prior art) Automobiles, motorcycles, etc. are often equipped with audio devices such as car radios and car stereos, and when these audio devices are initially set to a certain volume, the volume remains constant regardless of the vehicle speed. be done.

For this reason, if you adjust the volume at low speeds, engine noise, wind noise, etc. will increase at high speeds, making it difficult to hear unless you turn up the volume. In addition, there was a problem in that when the volume was adjusted at high speeds, the warp was too loud at low a and became harsh.

Therefore, as shown in Japanese Patent Publication No. 53-40857, there is a system that automatically adjusts the volume depending on both the noise generated when the engine is under high-speed load and the noise generated when the vehicle is running at high speed.

By the way, noise sources include engine noise, wind noise, and noise, and when the vehicle is stopped, the noise increases in proportion to the rotational speed. A cutting sound is added to this engine sound depending on the vehicle speed.

However, with conventional systems, the volume is not adjusted in response to changes in noise while the vehicle is stopped and while the vehicle is running, and the volume cannot be adjusted sufficiently depending on the driving condition. do not have.

(To solve the problem of invention or not) This invention was developed against the background of this situation, and it is designed to adjust the volume in response to changes in noise while stopped and while driving. This function effectively adjusts the volume according to the driving conditions.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a system between a preamplifier installed in a vehicle that adjusts the sound quality of a tuner, tape deck, etc., and a main amplifier that amplifies this output signal. ,
In the in-vehicle audio device comprising a volume control circuit that adjusts the output signal according to noise, the volume control circuit receives a speed signal proportional to the rotational speed of the engine from the rotational speed detection means and a driving operation of the vehicle. The present invention is characterized in that the output signal of the preamplifier is controlled by a control signal obtained by integrating a detection signal from a means for detecting a running state.

(Operation) This invention obtains a control signal by integrating a speed signal proportional to the engine rotation speed from the rotation speed detection means and a detection signal for detecting the running state from the vehicle travel operation means, and obtains the control signal. controls the output signal of the preamplifier, and adjusts the volume according to the noise level depending on whether the vehicle is moving or stopped.

(Example) Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 is a block diagram showing the general configuration of the present invention.

In the figure, reference numeral 1 denotes a preamplifier such as a tuner or tape deck mounted on a vehicle.The output signal from this preamplifier 1 is adjusted to a predetermined volume by a volume control circuit 2 and supplied to a main amplifier 3. The output signal is amplified by the main amplifier 3 to a power sufficient to drive the speaker 4.

The volume control circuit 2 obtains a control signal by integrating a speed signal proportional to the engine rotation speed from the rotation speed detection means 5 and a detection signal for detecting the running state from the vehicle travel operation means 6. The control signal is used to control the output signal from the preamplifier 1 and supply it to the main amplifier 3.

FIG. 2 shows a specific circuit diagram of this invention.

An adjustment volume 7 for adjusting the volume is interposed between the preamplifier 1 and an integrator 21 that constitutes a part of the volume control circuit 2, and the adjustment volume 7 is operated to set the desired volume. is recorded.

The volume control circuit 2 includes the integrator 21 and an integrator 23 connected to the integrator 21 via an adjustment volume 22.

The igniter 8 constituting the serious crime rotation speed detection means 5 is connected to the integrator 23 via the F-V conversion circuit 9.
The output pulse generated by the igniter 8 is subjected to F-V conversion, and a voltage proportional to the engine rotation speed is supplied to the integrator 23. The igniter 8 is disposed in the ignition system of the engine, but the rotational speed detecting means 5 may be a tachometer that utilizes pulses generated by opening and closing contact points of the distributor.

The driving operation means 6 of the vehicle includes a neutral switch 1.
0 and a clutch switch ti, which are connected to the integrator 23 via an interface circuit 12.

When the neutral switch 10 or the clutch switch 11 is operated, the vehicle is stopped, and when it is not operated, the vehicle is running, and detection signals for detecting these running states are output.

The value of this detection signal is set to a predetermined value or less when the vehicle is stopped, and is set to a predetermined value or higher when the vehicle is moving.In this way, different values are detected when the vehicle is traveling and when the vehicle is stopped. The signal is input to an integrator 23. This detection signal is integrated with the engine rotational speed detection signal, and when the vehicle is stopped, a control signal proportional to the engine rotational speed is obtained, and while the vehicle is running, the engine rotational speed and wind noise proportional to this rotational speed are added. A controlled control signal can be obtained.

This control signal is adjusted to a desired magnitude by an adjustment volume 22 and input to an integrator 21. With this integrator 21,
Furthermore, it is integrated with the output signal from the preamplifier 1 adjusted by the adjustment volume 7, and this controlled output signal is supplied to the main amplifier 3.

Note that this adjustment volume 22 may be made to be freely operable by the driving vehicle, or may be normally fixed and adjusted only when necessary.

Furthermore, a delay circuit that increases the responsiveness of the integrator 23 of the volume control circuit 2 or has a separate time constant is installed between the travel operation means 6 and the integrator 23, or between the integrator 23 and the integrator 21.
can be inserted between the two to eliminate unnatural hearing.

FIG. 3 shows this device mounted on a large motorcycle.

An audio system A such as a car radio or car stereo to which the present invention is applied is provided in the fairing 31. The automatic volume control device B is incorporated in a portion 31a located on the left side of the fuel tank 32. and,
On the panel is an adjustment volume 7 for adjusting the output signal of the preamplifier l, and an adjustment volume 22 for adjusting the control signal.
is installed. A pair of speakers 4 are disposed at symmetrical positions in front of both sides with the fuel tank 32 in between.

Next, the operation of this embodiment will be explained based on FIGS. 2 and 4.

If you open a car radio while driving, the output signal set by the adjustment volume 7 from the preamplifier 1 will be
The signal is supplied to the main amplifier 3 via the integrator 21 of the volume control circuit 2 and output to the speaker 4.

At this time, the output pulse generated from the igniter 8 is F
The -V converter 8 converts the voltage into a voltage proportional to the engine speed, and inputs the voltage to the integrator 23.

At this time, when the neutral switch 10 and the clutch switch 11 are not operated and the vehicle is in a running state, a detection signal indicating the running state is supplied to the integrator 23 via the interface circuit 12.

This integrator 23 integrates the engine rotational speed detection signal and the detection signal indicating the running state, and outputs this as a control signal.

As shown in Fig. 4, this control signal is a straight line a of the control signal that controls the engine noise, which increases proportionally to the engine rotational speed, and controls the wind noise, which increases proportionally to the engine rotational speed. The result is the addition of a straight line of control signals.

This control signal is supplied to the integrator 21 at a value set by the adjustment volume 22.

Then, in the integrator 21, this control signal and the output signal from the pre-up 1 shown in 1111 are integrated in the same way to form a predetermined output signal, which is then supplied to the main amplifier 3 and becomes a sound ψ corresponding to the noise during driving. .

On the other hand, when stopped, the neutral switch
Or, because the clutch switch 11 is operated, a detection signal indicating the stop state is supplied to the integrator 23 via the interface circuit 12, and this detection signal and the engine rotational speed signal are integrated. The control signal that is generated is shown by a straight line a that is proportional to the rotational speed of the engine, as shown in FIG. 4, and is a control signal from which wind noise has been removed.

Then, based on this control signal, the integrator 21 integrates the output signal from the preamplifier 1 in the same manner as described above, and the output signal adjusted to a predetermined output signal is supplied to the main amplifier 3 to perform appropriate volume control.

Alternatively, only one of the 211 tral switch 10 and the clutch switch 11 may be used as the traveling operation detection means 6.

(Effects of the Invention) As described above, in the present invention, the volume control circuit receives a speed signal proportional to the rotational speed of the engine from the rotational speed detection means;
The control signal is obtained by integrating the detection signal that detects the driving state from the vehicle's driving operation means, and the output signal of the preamplifier is controlled by this control signal, so that You can adjust the corresponding volume.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the general configuration of this invention, and FIG.
The figure is a specific circuit diagram of the present invention, Figure 3 is a diagram showing the present invention mounted on a large motorcycle, and Figure 4 is a diagram showing engine rotational speed-volume characteristics obtained by this embodiment. It is. 1...Pre-up 2...Volume control circuit 3...Main amplifier 4...Speaker 5...Rotation speed detection means 6...When driving operation means Person Yamaha Motor Co., Ltd. Figure 3 Figure 4 Abuse] Nojin @nt envy

Claims (1)

[Claims] An in-vehicle audio device that is equipped with a volume control circuit that adjusts the output signal according to noise, between a preamplifier that adjusts the sound quality of a tuner, tape deck, etc. installed in the vehicle, and a main amplifier that amplifies the output signal. In the above, the volume control circuit generates a control signal obtained by integrating a speed □- which is proportional to the rotational speed of the engine from the rotational speed detection means and a detection signal for detecting the running state from the vehicle running operation means. An automatic volume control device for a vehicle-mounted audio device is configured to control the output signal of a preamplifier according to No. 1111.