JPH04138946A - On-vehicle audio device - Google Patents

Abstract

PURPOSE:To prevent the occurrence of a trouble in which a driver is difficult to hear music owing to the increase of noise due to water droplets and splashes of water through the volume regulating function of a control part. CONSTITUTION:A cassette tape is charged in a cassette deck 1 and music sounds at a proper volume through speakers 6A-6D. In this case, when a volume is stored in the internal memory of a microcomputer 3, simultaneously with the starting of control, it is detected by the microcomputer 3 whether an operation signal from a wiper 7 is inputted, and it is decided whether the wiper 7 is turned ON. In which case, when it is turned ON, according to the operation state of the wiper 7, i.e. the state of a low speed Lo and a high speed Hi, a volume generated by the speakers 6A-6D is controlled so that a volume is adjusted to a value having a level increased by a given amount from a reference volume.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle-mounted audio device, and particularly to a vehicle-mounted audio device having a so-called electronic volume.

[Background technology]

In recent years, in-vehicle audio equipment (car audio) has become more multi-functional due to improvements in the performance of electronic components, accuracy and performance of mechanical parts, and to meet the needs of users who demand luxury and high performance. , gentrification.

Performance has been improved. For example, to adjust the volume, instead of the conventional volume (which usually uses an externally adjustable potentiometer), many devices are now equipped with an electronic volume that can be operated with one touch in conjunction with a microcomputer. Ta.

[Problem to be solved by the invention]

However, on a rainy day compared to a sunny day, the noise level (noise level) becomes thicker due to the sound of water droplets hitting the car body, water splashing, etc., so it becomes difficult to hear at the same volume as on a sunny day. For this reason, conventionally, the passenger had to manually increase the volume of the audio device, which was troublesome and time-consuming.

[Object of the Invention] The present invention has been made in view of the problems of the conventional example, and its purpose is to prevent the passenger from performing any volume correction operation, regardless of whether it is a rainy or sunny day. To provide an in-vehicle audio device that allows you to always listen to music, etc. at an appropriate volume without having to listen to music.

[Means to solve the problem]

The present invention receives an audio source and an audio signal output from the audio source.

It includes an electronic volume that increases or decreases the level of the audio signal according to an external command and outputs the level to the audio output section, and a control section that controls the electronic volume. The wiper of the vehicle is connected to the control unit, and the control unit has a volume adjustment function that controls an electronic volume according to a wiper operation signal output from the wiper for each operating state. I'm picking it up. This aims to achieve the above-mentioned purpose.

[Embodiment] Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 and 2.

The embodiment shown in FIG. 1 inputs a cassette deck 1 as a sound source and analog stereo audio signals rRu and rLJ reproduced by this cassette deck 1, and inputs the level of the audio signals from a microcomputer, which will be described later. an electronic volume 2 that increases or decreases according to commands and outputs to the audio output unit 4; and a microcomputer as a control unit that controls the electronic volume 2.
3.

Specifically, the electronic volume 2 is an rcE (Chip enable) J from the microcomputer 3.

rCLK (C1oc k)J, “DATAJ
is controlled by each signal.

The audio output section 4 includes power amplifiers 5A and 5B.

5C, 5D, front left speaker 6A, front right speaker 6B, and rear left speaker 6C connected to each power amplifier, respectively.
, and a rear right speaker 6D. These speakers 6A, 6B, 6C.

6D has an electronic volume of 2 and a power amplifier of 5A.

The audio signals sent via 5B, 5C, and 5D are converted into audio and output.

Furthermore, in this embodiment, the wiper 7 of the vehicle is connected to the microcomputer 3. Specifically, a wiper motor (not shown) constituting the wiper 7 is connected to the microcomputer 3, and the current value flowing through this wiper motor varies depending on the operating state of the wiper 7, that is, when the wiper 7 is operating at 2 intermittent times (INT) and at low speeds ( L
o) and at high speed (Hi), these are input to the microcomputer 3 as operating signals (voltage signals) S, , S, , S3 via resistors R+, Rz, and R3, respectively.

Next, a control program for the microcomputer 3 related to volume adjustment, which is a feature of this embodiment, will be explained with reference to the flowchart shown in FIG.

It is assumed that a cassette tape is loaded into the cassette deck 1 and music is being played at an appropriate volume from the speakers 6A to 6D. This starting volume (actually,
This is the level of the audio signal corresponding to this volume. )
is stored in the internal memory of the microcomputer 3, and the following control operations are performed using this as a reference volume.

Simultaneously with the start of control, the CPU (not shown) of the microcomputer 3 first detects whether any of the above-mentioned operation signals is input from the wiper 7, thereby controlling the wiper 7.
Determine whether it is “ON” (Step 5IO)
I). When the wiper 7 is set to OFF, there is no need to adjust the volume, so the CPU issues a command to the electronic volume 2 to set the correction level to 0, that is, to leave the standard volume unchanged. (3106), the control operation ends. On the other hand, if any operation signal is being input, a timer (not shown) is activated at the same time as the input of the operation signal starts, and a wait is waited for X seconds (for example, 2.3 seconds) to elapse (S102 ). Then, after X seconds have passed, again,
It is determined whether the wiper is "ON" or not (5103), and if the wiper is rOFFJ, an r correction rehe) Lt r OJ J (') command is given to the electronic volume 2 (S1
06), the control operation ends. This is during light rain 1-2
This is to prevent the volume from being corrected in such a case since the wiper may be moved several times.

On the other hand, if the determination in step 5103 is "yes" (in this case, it is considered that the wiper 7 has been RON and L for more than X seconds), it is determined whether or not the signal S2 is input from the wiper 7. By determining whether the operating state of the wiper 7 is low speed "Lo" (3104)
. When the operating state of the wiper 7 is "rLo", the CPU sets the electronic volume 2 to "correction level "1"".
In other words, a command is issued to set the volume to a level that is α decibel (dB) higher than the reference volume (S107). As a result, the volume of the sound output from the speakers 6A to 6D gradually increases to a level that is α [dB] higher than the reference volume. On the other hand, if the operating state of the wiper 7 is not "rLo", it is determined whether the operating state of the wiper 7 is "high speed rHi" by determining whether the signal S3 is input from the wiper 7 (3105 ). Then, when the operating state of the wiper 7 is "rHi", the CPU commands the electronic volume 2 to "command the correction level "2 Jul", that is, β (dB) from the reference volume (here, β>α).
A command is issued to set the volume to the added level (310B).

As a result, the volume of the sound output from the speakers 6A to 6D gradually increases to a level β (dB) higher than the reference volume.

On the other hand, if the operating state of the wiper 7 is not "Hl" in step 5105 (in this case, it is in the "INTJ state"), the CPU returns to step 5101 and repeats the above control operation. While the operating state of No. 7 is in the rlNT (intermittent) J state, the volume is not corrected.

Further, even after the volume correction in steps 3107 and 5108, the process returns to step 5101 and repeats the above control operation. As a result, if the operating state of the wiper 7 is changed from high speed to low speed, the determination in step 5107 is "yes".
Therefore, α (dB:
If correction is made to the volume that has been increased, that is, to a volume that is down by (βα) [dB] from the volume up to that point, and conversely, the operating state of the wiper 7 is changed from low speed to high speed, The judgment in step 310B is "yes", and the volume is corrected to be β (dB) higher than the reference volume, that is, (β - α) (d) from the volume up to that point.
Correction is made to increase the volume by B). Further, when the wiper 7 changes from rON to rOFFJ, the determination in step 5101 or 5103 becomes "no",
The volume of the sound output from the speaker gradually shifts to the reference volume, that is, the volume at the start.

According to the embodiment described above, on a rainy day, the volume of the sound played from the speaker during tape playback is corrected according to the operating state of the wiper 7.
When the wiper 7 is operating at "high speed", the volume increase correction is made by β (dB), and when the wiper 7 is operating at "low speed", α is applied.
[dB] volume increase correction is performed, which prevents the conventional problem of increasing noise due to water droplets and water splashes and making it difficult to listen to music, etc. Moreover, this volume correction is automatically performed by the microcontroller 3. It is convenient because it does not take much time to operate. In addition, since the volume correction by microcomputer 3 is performed based on the starting volume,
Even if the operating state of the wiper 7 changes midway through, the volume is corrected to an appropriate level.

In the above embodiment, the cassette deck 1 is used as an audio source, but the present invention is not limited to this, and other audio sources such as FM, AM radio, or CD player may also be used. Of course, you may use it.

〔Effect of the invention〕

Since the present invention is configured and functions as described above, according to this, the electronic volume is controlled according to the operating state of the wiper by the volume adjustment function of the control section. The volume of the audio source such as a cassette deck or CD player is adjusted according to the intensity of the rain, so the noise increase due to water droplets and splashes, which was a problem in the past, is avoided. It is possible to prevent the inconvenience that it becomes difficult to listen to music etc. due to this. Furthermore, since this volume correction is automatically performed by the control section, it is convenient and requires no effort to operate. Therefore, regardless of whether it is a rainy or sunny day, passengers can always listen to music at an appropriate volume without having to perform any volume correction operations, making this an unprecedented and excellent in-vehicle audio system. can be provided.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a flowchart showing the main control program of the microcomputer shown in FIG. 1...Cassette deck as a sound source, 2
......Electronic volume, 3...Microcomputer as control section, 4...Audio output section, 7...Wiper

Claims (1)

[Claims] (1) A sound source, an electronic volume that inputs an audio signal output from this sound source, increases or decreases the level of the audio signal according to an external command, and outputs it to an audio output section, and controls this electronic volume. a control unit, the wiper of the vehicle is connected to the control unit, and the control unit controls the electronic volume in accordance with a wiper operation signal output from the wiper for each operating state. An in-vehicle audio device characterized by having: