JPS6342210A - Adjusting device for acoustic equipment for vehicle - Google Patents

Abstract

PURPOSE:To appropriately control a sound volume in accordance with an actual hissing sound, by extracting a high frequency component which is scarcely influenced by an audio sound in a hissing sound, and adjusting an acoustic equipment, based on said high frequency component. CONSTITUTION:In a hissing sound detected by a microphone 7, in addition to a sound whose frequency is the same as that of an audio sound, many sound of a high frequency of>=15kHz are contained, and intensity of the hissing sound of a high frequency of>=15kHz is roughly proportional to intensity of the whole hissing sound. Accordingly, intensity of the hissing sound can be detected from amplitude of a high frequency component of a hissing sound detecting signal which has been extracted by a highpass filter 10. Also, in a detecting/averaging circuit 11, an AC signal from the high-pass filter 10 is converted to a DC signal for showing an average value of the amplitude, and outputted to a sound volume controll circuit 12. In this way, based on this DC signal, the sound volume of the audio signal can be controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an adjustment device for vehicle audio equipment, and particularly to an adjustment device suitable for audio equipment for oven cars.

(Prior Art) -a. When listening to music by operating audio equipment in a car, there are many cases where it is difficult to enjoy the music comfortably because of various noises.

Therefore, in Japanese Patent Application Laid-open No. 57-50116, the speed of fan motors of air conditioners, ventilation systems, etc., the opening of car windows, and the vehicle speed that are the cause of engine noise are detected, and the sound quality is adjusted according to the noise situation. A volume adjustment device for a vehicle audio device is described, which adjusts the volume of the device.

(Problems to be Solved by the Invention) In the case of a normal automobile, the cabin is relatively closed as it runs, so the cabin is relatively quiet, and the volume can be adjusted using the volume control device described in the above-mentioned publication. If you do this, you will be able to listen to music in generally good condition.

However, when driving in an oven body type car (hereinafter referred to as an open car) with a roof that can be opened and closed, intense air noise (wind noise) can be heard near the top of the front window. sound)
This wind noise accounts for most of the noise, so the volume control device described in the above publication adjusts the volume based on the speed of the fan motor, the opening of the car window, and the vehicle speed. Adjust it (jsu: F !; -11, it', (i
In January, it is difficult to say ``contradiction - 1 subtraction''.

The wind noise of I7 is the car i! 1.; J: It is true that wind noise is affected by the natural wind as well as the running wind, so the wind 'J The correlation of the Seven Wheels Association is -, indeterminate, and -.

For example, when the wind speed is 5 m/s.e., the wind speed is 5 m/s.e.
1”, ゛ becomes 11, its opposite, ”’, 5 m
/ s e c tailwind j,,i, vehicle speed is 18km/H%
[a little], has an equal influence on -, becomes two.

This is similar to the case with oven cars, although the overall wind noise is reduced when the car is driven with the roof open.

(First step to solve the problem) Vehicle acoustics 1'S1 according to the present invention. The adjustment device is equipped with a wind noise detection means for detecting wind noise generated in the vehicle.
, G, Wind noise detection] Wind noise detected by two stages also extracts high frequency components with frequencies above a predetermined value -1-
4. High frequency component extraction means 4. Output Q of the high frequency component extraction f stage of IJl, ', and control means for adjusting the acoustic analyzer (+person - t) (1) , (Function) Present invention Q, ``Adjustment of the vehicle audio equipment according to the above,;
:Snoop 7 i;J:, Vehicle i, 2 The wind noise generated is wind'
J F'c I'ij J-j J″rl JJ2-
, -C direct detection F'〉J main a), and the high frequency component of the frequency of the predetermined value quantum of the detected sound is extracted by high frequency component extraction I'1, ro.

, 1-2, SuJ volume 5, 2 is 1" (
-2, the high frequency component that is almost not included in the sound (-(゛-dio sound)) is included, so the strong tone of the wind jjj sound is generated by the high JJ1 wave component with a frequency of 1 above the predetermined value. is detected.

(・Shi, high 1-, 'iJ wave component extraction 1' first stage output Q
, by means of control, the palace equipment is 3) 1 unit ('541.ru., - field,), when the high frequency component is strong, the volume is high 1",?) There is no t circumference adjustment such as: 1.!-6, (effect of the invention), Φ Ryogawa acoustics according to the present invention (adjustment of several instruments; setting 12.-
Yo 11 degrees, then J-Explanation j Also, what about the sound of the wind? ,
Since the high-frequency components that are hardly affected by the idio sound are extracted and the audio equipment is adjusted based on this high-frequency component, the audio equipment can be adjusted to correspond to the actual wind noise. 1. (Examples) Examples of the present invention will be described below with reference to the drawings.

This embodiment is an example in which the present invention is applied to an oven body type automobile (hereinafter referred to as an oven car) in which the roof side of the automobile can be opened and closed freely.

As shown in Figs. 1 and 2, a main body 3 of an audio device (hereinafter referred to as audio device) is incorporated in approximately the middle part of the instrument panel 2 of the oven car i, and a pair of left and right Speakers 4 are installed 6J as shown in 1' and 2.1.

When running 4' in the oven state, the running wind < 4N, I, (including natural wind) is as shown in Figure 2. Part 6
When the air becomes turbulent, airflow noise called wind noise is generated in the plow.

5″, wind clearance: FS, >5m, small Ha1 for detection
1's -r ,,,+,) i off A7 is F1 on (
If the entire upper part of the glass 5 is supported) If the top part of the shrine 6 is completely supported, the mirror 8 installed in the center of the top shrine 6 will be removed! Part 13 a: 1 is inserted backward.

-Room me above 3-8 kl, front desk 1-1-
Position 137 is located on the 1 side of the river/knob member, and microphone 1-1 is installed near the location where wind noise is generated.
-v-Vicron: On 7 (2) Since it does not hit the wind directly, it is not only suitable for detecting wind sound, but also 1. It is also far away from the speakers of audio equipment. So the +jS g and n of the O-di juon are less.

Next, the adjustment system for the vehicle audio equipment according to the present JfE example will be explained in detail based on the first example.

Wind noise 4L'j detected by the microphone 7:
If you are on I-'r I-δ and there is strong wind noise,
When the volume of the de (jyuon is high and the volume of the wind and is weak, the volume of the oday consonant is controlled to be low. An amplifier circuit 8 receives and amplifies the signal, and receives a wind noise amplification signal from the amplifier circuit 9 and amplifies it at a predetermined frequency (for example, 15 KHz).
a bypass filter 10 that extracts the above frequency components;
A detection/averaging circuit that receives, detects and averages the alternating current signal of the high frequency component of wind noise output from the bypass filter 10, and outputs a direct current signal representing the average value of the amplitude values over a certain period of time (for example, one second). 11, and a volume control circuit 12 which receives the DC signal from the detection/averaging circuit 11 and controls the volume of audio sound.

The volume control circuit 12 is connected between an audio source 13 (radio tuner or tape deck) of audio equipment and an amplifier 14, and this volume control circuit 12 controls the current of the audio sound AC signal output from the audio source 13. The volume of the audio sound is controlled by controlling the volume of the audio sound so that the volume of the audio sound increases as the wind noise becomes stronger and the voltage of the DC signal output from the detection/averaging circuit 11 increases. do.

That is, the sound detected by the microphone 7 includes audio sound in addition to wind noise, but the frequency of audio sound is mainly in the range of 15 kHz or less, whereas wind noise 1 outside the volume of the same frequency as the audio sound above
It also contains many high-frequency sounds of 5KHz or higher, and 15
The intensity of wind noise at high frequencies of KHz or higher is approximately proportional to the overall intensity of wind noise.

Therefore, the strength and sound pressure level of wind noise can be detected from the amplitude of the high frequency component of the wind noise detection signal extracted by the bypass filter 10. It is converted into a DC signal representing the average amplitude of the AC signal from the wind noise, which is output to the volume control circuit 12, and the volume of the audio sound is controlled based on the DC signal representing the strength of the wind noise. be done.

In this way, when the wind noise is weak, such as when driving at low speeds or when stopped, the audio sound volume is controlled low, and when the wind noise becomes strong, such as when driving at high speeds or when the wind is strong, the volume of the audio sound is controlled to be low, depending on the strength of the wind noise. The audio volume is suppressed to a high level. Therefore, the user can comfortably listen to audio sounds without being disturbed by wind noise.

Note that the microphone 7 is not necessarily the room mirror 8.
It is not necessary to incorporate it into the mounting arm 8a, but it may be provided near the inner surface on the right end side of the front wind top member 6 (near the inner surface of the upper end of the right front pillar 15).

Next, the adjustment device for the vehicle audio equipment described above may be partially modified as shown in FIG.

When the oven car 1 is driven with the roof structure closed and the windows closed to keep the interior of the vehicle in a substantially airtight state, the noise inside the vehicle is determined mainly by the operating conditions (load and rotation speed) of the engine ( Ru.

Therefore, an engine rotation speed sensor 16 that detects the engine rotation speed, a throttle opening sensor 17 that detects the opening degree of the throttle valve of the engine, and an arithmetic circuit 18 that receives outputs from both the sensors 16 and 17 are provided. A relay switch 19 is provided to selectively connect the arithmetic circuit 18 and the detection/averaging circuit 11 to the volume control circuit 12,
A window opening/closing switch 20 is connected in series to the coil 19a of the relay switch 19, and when the roof structure and windows are closed, the window opening/closing switch 20 is closed and the relay switch 19 is switched to the arithmetic circuit 18.

The arithmetic circuit 18 controls the volume of a DC signal having a voltage that increases as the engine speed increases and increases as the throttle opening degree increases, based on the engine speed signal and the throttle opening signal. Output to circuit 12.

Therefore, when running the oven, the microphone 7
The audio sound is adjusted based on the wind noise detection signal detected by the wind noise detection signal, and when the vehicle is driven in a substantially closed state like a normal car, the audio sound is adjusted according to the operating state of the engine.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. Fig. 1 is a perspective view of the front seat area of a convertible car, Fig. 2 is an explanatory diagram illustrating the generation of wind noise in a convertible car, and Fig. 3 is a diagram showing the installation of a microphone. Side views 1 and 4 of the rear-view mirror shown in FIG. 7... Micromen, 9... Amplifier circuit, IO...
High pass filter, 11...detection/averaging circuit,
12...Volume control circuit. Patent applicant Mazda Motor Corporation Figure 1
, 1 Fig. 2

Claims (1)

[Claims] (1) A wind noise detection means for detecting wind noise generated in a vehicle; and a high frequency component extraction means for extracting a high frequency component having a frequency equal to or higher than a predetermined value from the wind noise detected by the wind noise detection means. and a control means for adjusting the audio equipment based on the output of the high-frequency component extraction means.