JPH03243437A - On-vehicle sound system - Google Patents

Abstract

PURPOSE:To eliminate inadvertent leakage of sound to the outside of a car by actuating muting function when a door is opened, and when a window is opened wider than a predetermined level during the car is stopped, in an automatic mute selection mode. CONSTITUTION:A muting circuit 2 for damping the output of an audio signal to the side of a speaker 5 is connected to a cassette deck 1 as a source. A controller 2 for controlling the muting circuit 2 is connected to the muting circuit 2. An automatic mute selection switch 7, a door opening/closing detection switch 8, a window opening/closing detection switch 9, and a car speed sensor 10 are provided on the controller 6. In an automatic mute selection mode, the muting circuit 2 is driven and controlled when the door is opened, and when a window is opened wider than a predetermined level during the car is stopped, so as to damp audio signal output.

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 muting circuit.

[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, with the pursuit of higher sound quality, music playback that used to be based on analog signals using cassette tapes has become increasingly common, but now music is played using digital signals using CDs (compact discs) and other devices. In addition, many devices are now equipped with various functions such as loudness and muting.

This muting function instantly reduces the volume of the audio being played using a button.

This muting function can, for example, temporarily reduce (attenuate) the volume of loud music when paying a toll at an expressway toll booth, making it easier to hear the toll, or when paying a toll at a railroad crossing. Confirmation is convenient.

[Problem to be solved by the invention]

However, in conventional car audio systems, the muting function can be activated or canceled by the operator using the button (
At toll booths, ￥＠tickets, etc., you have to press the button for muting, and when you are listening to loud music while parking, you may inadvertently open the door If opened, it may cause trouble to others.

[Purpose of the invention]

The present invention was developed in view of the problems of the conventional example, and its purpose is to prevent the driver from opening the window at a toll gate or railroad crossing while listening to loud music, or when the driver opens the window while the driver is parked. To provide an in-vehicle audio device that automatically mutes when a door is opened inadvertently.

[Means to solve the problem]

The present invention provides an FM or AM receiving circuit or a cassette deck,
It includes a source such as a CD player, and a muting circuit that inputs an audio signal output from the source and attenuates the output of the audio signal to the speaker side in accordance with an external command. This muting circuit is provided with a control section that controls the muting circuit, and this control section includes an auto-mute selection means that outputs an auto-mute selection command in response to an external operation, and an auto-mute selection means that outputs an auto-mute selection command in response to an external operation, and an auto-mute selection means that outputs an auto-mute selection command in response to an external operation. door opening/closing detection means for detecting this when the window is opened by a predetermined amount or more; window opening/closing detection means for detecting this when the window is opened by a predetermined amount or more; and a vehicle speed that detects the running speed of the vehicle and outputs a detection signal proportional to the speed. It is also equipped with a detection means. The control unit has a first determination function that determines whether or not the automute selection state is present based on the presence or absence of an automute selection command, and a first determination function that determines whether the door is open or not based on the presence or absence of a detection signal from the door opening/closing detection means. A second determination function determines whether the window has been opened by a predetermined amount or more based on the presence or absence of a detection signal from the window opening/closing detection means, and a third determination function determines whether the vehicle is stopped based on the output of the vehicle speed detection means. a fourth determination function that determines whether the automute is selected, a first muting function that controls the muting circuit to attenuate the audio signal output when the door is opened in the automute selection state, and an automute selection state. The second muting function controls the muting circuit to attenuate the audio signal output when the window is opened by a predetermined amount or more during the stop.

This aims to achieve the above-mentioned purpose.

[Example] Hereinafter, an example 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 source, an analog audio signal recorded on a cassette tape (not shown) played by this cassette deck 1, and a speaker 5 of the audio signal. A muting circuit 2 that attenuates the output of the muting circuit 2 according to an external command, and a muting circuit 2 that attenuates the output of the muting circuit 2 in response to an external command. It includes a volume/sound quality adjustment circuit 3 that performs adjustment, and a power amplifier 4 that amplifies the output of this volume/sound quality adjustment circuit 3 and outputs it to a speaker 5.

Further, the muting circuit 2 is provided with a control section 6 that controls the muting circuit 2. This control section 6 is actually constituted by a microcomputer. Furthermore, this control unit 6 includes an automute selection switch as an automute selection means that outputs an automute selection command in response to an external operation, and a door opening/closing switch that detects when a vehicle door (not shown) is opened. A door opening/closing detection switch 8 as a detection means, a window opening/closing detection switch 9 as a window opening/closing detection means that detects when the window is opened by a predetermined amount or more, and a detection unit that detects the running speed of the vehicle and is proportional to the speed. Vehicle speed sensor l as a vehicle speed detection means that outputs a signal
There is also an O.

Of these, the door opening/closing detection switch 8 is installed between the vehicle body and the door and detects when the door is opened.
(on)" is used.

The window opening/closing detection switch 9 is installed near the regulator handle of the door and is turned ON when the window is opened by 90%, for example, 80%.

The vehicle speed sensor 10 used is one that detects the vehicle speed by using an input terminal to a speedometer (not shown). Here, the overall operation of this embodiment will be explained.

First, if the muting function of the muting circuit 2 is not working, the analog audio signal played by the Kasenotodenki 1 passes through the muting circuit 2 and is adjusted to the operator's (user's) preference by the volume/sound quality adjustment circuit 3. The volume and quality of the sound are adjusted to , and sent to the speaker 5 via the power amplifier 4, where it is converted into audio and output into the vehicle interior.

Next, a control program for the control section 6 regarding automute, which is a feature of this embodiment, will be explained along the flowchart of FIG.

First, the CPU (not shown) of the control unit 6 determines whether or not it is in the auto-mute selection state based on the presence or absence of an auto-mute selection command from the auto-mute selection switch 7 (step 5IOI) (first judgment function). , if the automute is not selected, there is no need for muting, and the control operation ends.On the other hand, if the automute is selected, the door opening/closing detection switch 8
It is determined whether the door is open or not based on the presence or absence of a detection signal from the controller (S102) (second determination function).

When the door is open, the muting circuit 2 is controlled to attenuate the audio signal output (
S105) (First muting function): As a result, ξ-neeting is automatically performed.

On the other hand, if the door is not opened, the vehicle speed sensor 10
It is determined whether the vehicle is stopped or not (S103) (fourth determination function) based on the output of - On the other hand, when the window is stopped, the window is closed by a predetermined amount (
(for example, 80%) or more.
S104) (Third judgment function) Then, if the window is not open for a predetermined amount or more, there is no need for muting and the control operation is ended.On the other hand, if the window is for a predetermined amount or more , controls the muting circuit 2 to attenuate the audio signal output [second muting function].Thereby, muting is automatically performed.

According to this embodiment described above, when you stop at a toll gate or the like and open the window, the audio output from the speaker is automatically muted, making it easier to hear the fare, and auto-muting saves time and effort. Even if you inadvertently open the door while listening to loud music while parked in a parking lot, etc., the audio output from the speaker is automatically muted, so you do not disturb others. There's no risk of it chipping. Furthermore, since an automute selection switch 7 is provided, the automute selection function can be canceled when it is not necessary.

In addition, in the above-mentioned example, although the case where Kasenotdenki 1 is used as a sauce was illustrated, the present invention is not limited to this, and FM.

Of course, other sources such as AM radio or a CD player may also be used.

(Effects of the Invention) Since the present invention is configured and functions as described above, the first . With the second judgment function and the first muting function, if you inadvertently open the door while listening to loud music while parking, the audio output will be automatically muted, making it easy for others to listen to loud music. There is no risk of nuisance, and the first . Third. The fourth function and the second muting function automatically mute the audio output from the speakers when you stop at a toll gate, railroad crossing, etc. and open the window.

It is possible to provide an unprecedented and excellent in-vehicle audio device that makes it easier to hear alarm sounds, etc., and does not require much effort due to automatic muting.

[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 control section of FIG. 1...Cassette Denki as a source, 2...
... Muting circuit, 5 ... Speaker, 6 ... Control section, 7 ... Automute selection switch as automute selection means, 8.
...Door opening/closing detection switch as door opening/closing detection means; 9...Window opening/closing detection switch as window opening/closing detection means; vehicle speed sensor as vehicle speed detection means.

Claims (1)

[Claims] (1), FM, AM receiving circuit or cassette deck, C
An in-vehicle audio device that includes a source such as a D player, and a muting circuit that inputs an audio signal output from the source and attenuates the output of the audio signal to the speaker side in accordance with an external command. The muting circuit is provided with a control section for controlling the muting circuit, and the control section includes auto-mute selection means for outputting an auto-mute selection command in response to an external operation, and a door of the vehicle. A door opening/closing detection means detects when the window is opened, a window opening/closing detection means detects when the window is opened by more than a predetermined amount, and detects the running speed of the vehicle and outputs a detection signal proportional to the speed. and a vehicle speed detection means for determining whether the automute selection state is selected based on the presence or absence of the automute selection command.
a second determination function that determines whether the door is open based on the presence or absence of a detection signal from the door opening/closing detection means; and a second judgment function that determines whether the door is open or not based on the presence or absence of a detection signal from the window opening/closing detection means; a third determination function that determines whether the vehicle is opened or not; a fourth determination function that determines whether or not the vehicle is stopped based on the output of the vehicle speed detection means; a first muting function that controls the muting circuit to attenuate the audio signal output; and a first muting function that controls the muting circuit to attenuate the audio signal output when the window is opened by a predetermined amount or more while stopped in the auto-mute selection state. An in-vehicle audio device characterized in that it is equipped with a second muting function.