JPH09160570A - On-vehicle audio playback system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an on-vehicle audio playback system to be automatically set to a volume desired by a listener, in the entire speed range from low speed to high. SOLUTION: From a volume setting signal coming from a volume setting part 25 operated by a listener and a vehicle speed pulse signal from a vehicle speed detector 25, a vehicle speed calculating part 28 in a microcomputer 27 calculates vehicle speed, which a vehicle speed/volume storage part 29 stores in relation to the volume set by means of the volume setting part 25. This stored value is renewed every time the listener changes volume settings using the volume setting part 25, and after certain data is obtained by storing these values repeatedly, the vehicle speed calculating part 28 in the microcomputer 27 samples the vehicle speed pulse signal from the vehicle speed detector 26 and reads the volume corresponding to the calculated vehicle speed from the vehicle speed/volume storage part 29, and for the volume, an audio signal from a sound source 21 is automatically set by means of a volume adjusting part 22 and output as a voice from a speaker 24 through a power amplifier 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-vehicle audio reproducing apparatus for automatically setting (adjusting) reproduction volume of a radio / stereo reproducing apparatus according to a vehicle speed in a vehicle compartment.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing a configuration of a conventional vehicle audio reproducing apparatus. In FIG. 2, this example is a combination of a sound source 1 that sends out an audio signal output by a radio and stereo reproduction device, an electronic variable volume (VR) or an electronic variable VR and a variable amplifier, and outputs the audio signal from the sound source 1 by a control signal. A volume adjusting section 2 for adjusting the level (volume) is provided. In addition, a power amplifier 3 that amplifies and outputs the audio signal output from the volume adjusting unit 2, a speaker 4 that outputs the audio signal from the power amplifier 3 as a voice, and a noise detection that is arranged indoors to detect running noise. A microphone 5 that outputs a signal is provided. Further, an amplifier 6 that amplifies and outputs the noise detection signal from the microphone 5, a low-pass filter (LPF) 7 that limits and outputs the band of the noise detection signal,
A vehicle speed detector 8 that outputs a vehicle speed pulse signal indicating the speed of a vehicle equipped with this device is provided. Further, an engine speed detector 9 that outputs an engine speed signal that indicates the engine speed of a vehicle equipped with this device, and a microcomputer 10 that performs control that outputs a control signal that automatically sets the sound volume to the sound volume adjusting unit 2. And have. The microcomputer 10 includes a CPU, a ROM,
The working RAM or the like has a noise level calculation unit 11 for performing the processing.

Next, the operation of this conventional configuration will be described. The running noise is detected by the microphone 5 arranged in the room, the noise detection signal is amplified by the amplifier 6, and the LPF 7 is detected.
Output to The LPF 7 limits the band of the noise detection signal and outputs it. The noise detection signal detected by the microphone 5, the vehicle speed pulse signal from the vehicle speed detector 8 and the engine speed signal from the engine speed detector 9 are input to the microcomputer 10, and the noise level calculation unit 11
Calculates the indoor noise level. The microcomputer 10 controls the volume adjusting unit 2 according to the calculated room noise level to adjust the volume of the audio signal from the sound source 1 of the radio or stereo reproduction device, and the audio signal is transmitted to the speaker 4 via the power amplifier 3. Is output from.

[0004]

However, in the in-vehicle audio reproducing apparatus of the above-mentioned conventional example, the noise detection signal detected by the microphone 5, the vehicle speed pulse signal from the vehicle speed detector 8, and the engine speed detector 9 are detected. Although the playback volume can be automatically set according to the room noise level calculated from the engine speed signal, the playback volume increase amount is up to a preset value, and the volume cannot always be set to the volume requested by the listener. was there.

The present invention solves the problems in the prior art as described above, and automatically sets (adjusts) the volume desired by the listener at all vehicle speeds from high speed to low speed.
To provide an excellent in-vehicle audio playback device capable of

[0006]

In order to achieve the above object, the present invention provides a volume adjusting means for adjusting the volume of an audio signal from a sound source by a control signal and outputting the same, and a volume adjusting means for adjusting the volume. Volume setting means for setting, vehicle speed detection means for detecting the speed of a vehicle equipped with this device,
From the vehicle speed / volume storage means, a vehicle speed / volume storage means for storing the volume set by the volume setting means in association with the vehicle speed detected by the vehicle speed detection means, and a volume corresponding to the vehicle speed fetched from the vehicle speed detection means And a control means for reading out and outputting a control signal for setting the volume adjusting means to this volume.

As described above, it is possible to automatically set (adjust) the volume desired by the listener at any vehicle speed from high speed to low speed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention sets a volume adjusting means for adjusting the volume of an audio signal from a sound source by a control signal and outputting the volume, and a volume adjusting means. Volume setting means, a vehicle speed detecting means for detecting the speed of a vehicle equipped with this device, and a vehicle speed / volume storage means for storing the volume set by the volume setting means in association with the vehicle speed detected by the vehicle speed detecting means. And a control means for reading the volume corresponding to the vehicle speed fetched from the vehicle speed detection means from the vehicle speed / volume storage means and outputting a control signal for setting the volume adjustment means to this volume. By storing the volume manually set by the listener and the vehicle speed at that time in association with each other, the volume corresponding to the current vehicle speed can be automatically set (adjusted) based on this memory. Gear has the effect of listener can Toko to automatically set the desired volume at any speed up slow.

According to the second aspect of the invention, the control means counts a fixed time after the volume is changed by the volume adjusting means, and the volume setting means can change the volume again within this time. If not performed, the vehicle speed detection means detects the vehicle speed and stores it in the vehicle speed / volume storage means together with the volume corresponding to this vehicle speed. The vehicle speed detected after a fixed time after the volume is changed. Since the volume is stored together with the volume corresponding to this, the volume corresponding to the vehicle speed when the listener continuously and carelessly adjusts the volume is not stored, and the volume corresponding to the vehicle speed is automatically set thereafter. When this is performed, it has an effect of preventing a sense of discomfort from being heard.

According to the third aspect of the present invention, when the volume is changed by the volume adjusting means, when the change in the adjustment is large or small with a predetermined value or more, the volume and the vehicle speed of the setting are set to the vehicle speed. / It is something that is not stored in the volume storage means,
When a listener carelessly adjusts the volume adjustment means to a high level or a low level, the volume corresponding to the vehicle speed is no longer stored, and the volume automatically corresponding to the vehicle speed is set thereafter. , It has the effect of preventing a feeling of strangeness from being heard.

Further, in the invention described in claim 4, when the setting is changed to the volume corresponding to the vehicle speed, the adjustment is performed after a fixed time, and a time constant for the volume adjustment is provided. Therefore, the automatic setting control of the sound volume due to the change of the vehicle speed has the effect of smoothly changing the sense of hearing.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 is a block diagram showing a configuration of an embodiment of an in-vehicle audio reproducing apparatus of the present invention. In FIG. 1, this example is a combination of a sound source 21 that sends out an audio signal output by a radio or stereo reproduction device, an electronic variable volume (VR) or an electronic variable VR and a variable amplifier, and an audio signal from the sound source 21 by a control signal. And a volume adjusting section 22 for adjusting the level (volume) of the. Further, the power amplifier 23 that amplifies and outputs the audio signal output by the volume adjusting unit 22, and the speaker 2 that outputs the audio signal from the power amplifier 23 as voice.
And 4. Furthermore, a volume setting unit 25 for the listener to set the volume variation in the volume adjusting unit 22, a vehicle speed detector 26 that outputs a vehicle speed pulse signal indicating the speed of a vehicle equipped with this device, and a volume setting unit 25. And a microcomputer 27 that outputs a control signal for automatically setting the volume in the volume adjusting unit 22 based on the volume setting in step S1 and the vehicle speed pulse signal output by the vehicle speed detector 26.

The microcomputer 27 is a C (not shown).
The vehicle speed calculation processing unit 28, which includes a PU, a ROM, a working RAM, and the like, calculates the vehicle speed based on the vehicle speed pulse signal from the vehicle speed detector 26, and the vehicle speed calculation processing unit 28 calculates the volume set by the volume setting unit 25. It has a vehicle speed / volume storage unit 29 for storing the calculated vehicle speed in association with each other.

Next, the operation of the configuration of this embodiment will be described. The volume setting signal from the volume setting unit 25 operated by the listener and the vehicle speed pulse signal from the vehicle speed detector 26 are input to the microcomputer 27. A vehicle speed calculation processing unit 28 in the microcomputer 27 calculates the vehicle speed based on the vehicle speed pulse signal. Further, the vehicle speed / volume storage unit 29 of the microcomputer 27 stores the volume set by the volume setting unit 25 in association with the vehicle speed calculated by the vehicle speed calculation processing unit 28. This storage is performed every time the listener changes the volume setting in the volume setting unit 25, and this storage is repeated, and after constant data is obtained, the vehicle speed pulse signal from the vehicle speed detector 26 is sent to the microcomputer 27. The vehicle speed calculation processing unit 28 of FIG. Then, the volume corresponding to the calculated vehicle speed is read from the vehicle speed / volume storage unit 29, and the volume adjusting unit 22 is adjusted to this volume. The radio signal from the sound source 21 adjusted by the volume adjusting unit 22 and the audio signal of the stereo reproduction device are transmitted through the power amplifier 23 to the speaker 24.
Is output as voice. After this volume is automatically set,
When the listener operates the volume setting unit 25 to set a new volume, the storage is updated in association with the vehicle speed calculated by the vehicle speed calculation processing unit 28 at this time.

In this way, the volume previously set by the listener and the vehicle speed at that time are stored in association with each other, and the volume corresponding to the current vehicle speed is automatically set (adjusted) based on this memory. . Therefore, it becomes possible to automatically set the volume desired by the listener at any vehicle speed.

Further, the microcomputer 27 counts a certain period of time after the listener changes the volume in the volume adjusting section 22, and if the listener does not change the volume again within this counting time, The vehicle speed is calculated, and the volume corresponding to this vehicle speed is stored in the vehicle speed / volume storage unit 29. As a result, the volume corresponding to the vehicle speed when the listener continuously adjusts the volume adjusting section 22 carelessly is not stored in the vehicle speed / volume storage section 29, and the vehicle speed is dealt with thereafter. When the volume is automatically set, the sense of discomfort in hearing will not occur. Furthermore, when the listener changes the volume in the volume adjusting unit 22, the change in the adjustment is, for example, 15
If it is larger than dB, set the volume and vehicle speed to
The volume storage unit 29 does not store it. Also, even if the adjustment is made extremely low, it should not be remembered. Also in this case, the audible discomfort due to the automatic setting of the volume corresponding to the vehicle speed does not occur thereafter. When the vehicle speed calculation processing unit 28 calculates the vehicle speed and changes the volume,
Have a constant time constant. As a result, the automatic volume setting control according to the change in vehicle speed changes smoothly in the sense of hearing.

[0017]

As is apparent from the above description, according to the on-vehicle audio reproducing apparatus of the invention described in claim 1, the volume previously set manually by the listener and the vehicle speed at that time are stored in association with each other. Since the volume corresponding to the current vehicle speed is automatically set (adjusted) based on this memory, it is possible to automatically set the volume desired by the listener at any vehicle speed.

According to the on-vehicle audio reproducing apparatus of the second aspect, the vehicle speed detected after a fixed time after changing the volume is stored together with the corresponding volume.
The volume corresponding to the vehicle speed is not remembered when the listener continuously and carelessly adjusts the volume, and if the volume is automatically set according to the vehicle speed after that, the sense of discomfort can be eliminated. become able to do.

According to the on-vehicle audio reproducing apparatus of the third aspect, the volume corresponding to the vehicle speed in the case where the listener carelessly adjusts the volume adjusting means to the large level or the small level is not stored. When automatically setting the volume corresponding to the vehicle speed, it is possible to eliminate the discomfort in the sense of hearing.

According to the vehicle audio reproducing apparatus of the fourth aspect, when the volume is changed to correspond to the vehicle speed, a time constant for volume adjustment is provided. It will change smoothly on hearing.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an in-vehicle audio reproduction device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional vehicle-mounted audio reproducing device.

[Explanation of symbols]

 21 sound source 22 volume adjusting unit 23 power amplifier 24 speaker 25 volume setting unit 26 vehicle speed detector 27 microcomputer 28 vehicle speed calculation processing unit 29 vehicle speed / volume storage unit

Claims (4)

[Claims] 1. A volume adjusting means for adjusting and outputting an audio signal from a sound source by a control signal, a volume setting means for setting the volume adjustment by the volume adjusting means, and a vehicle equipped with this device. Vehicle speed detecting means for detecting speed,
From the vehicle speed / volume storage means, a vehicle speed / volume storage means for storing the volume set by the volume setting means in association with the vehicle speed detected by the vehicle speed detection means, and a volume corresponding to the vehicle speed fetched from the vehicle speed detection means An in-vehicle audio reproducing apparatus, comprising: a control unit that reads out and outputs a control signal for setting the volume adjusting unit to this volume. 2. The vehicle speed detection means when the control means counts a fixed time after changing the volume by the volume adjusting means and the volume setting means does not change the volume again within this time. 2. The vehicle-mounted audio reproducing apparatus according to claim 1, wherein the vehicle speed is detected and stored in the vehicle speed / volume storage means together with the volume corresponding to the vehicle speed. 3. When the volume is changed by the volume adjusting means, the volume and vehicle speed of the setting are not stored in the vehicle speed / volume storage means when the change in the adjustment is set to a magnitude larger than a predetermined value. The vehicle-mounted audio reproducing apparatus according to claim 1, wherein the audio reproducing apparatus is an on-vehicle audio reproducing apparatus. 4. When the vehicle speed detecting means detects the vehicle speed and the control means changes the setting of the volume adjusting means so as to match the volume corresponding to the vehicle speed, the setting of the volume adjusting means is changed after a certain period of time. The in-vehicle audio reproducing apparatus according to claim 1, wherein a control signal for outputting is output.