JPH0631772Y2 - Car audio system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to an audio system, and more particularly, to an on-vehicle audio system that detects whether the audio device is on or off based on whether the ignition switch is on or off to perform muting. Regarding

<Prior Art> As a practical use method of a car audio device, by adding to a genuine radio or a genuine cassette deck already installed when a car is bought, another higher-grade audio device such as a CD, which is not genuine, is used. In many cases, the player is installed and used in combination.

Since the genuine audio equipment is inexpensive, it is generally inferior in performance to the CD player, and pop noise is output from the genuine audio equipment itself when the power is turned on and off.

<Problems to be solved by the invention> Therefore, if the genuine audio equipment and the signal line or power supply line of the CD player are simply connected and used, when the ignition switch of the car is turned on or off, the genuine audio equipment However, if the CD player is turned off before or after the CD player is turned on, pop noise is output before the muting operation of the CD player itself.

<Means for Solving the Problem> According to the present invention, the above problem is achieved by a first audio signal reproducing device for reproducing and outputting a first audio signal and a second audio signal reproducing for reproducing a second audio signal. And a first audio signal input from the first audio signal reproducing device via an audio signal line,
A vehicle-mounted vehicle including a second audio signal reproduction device including an audio signal switching unit that selectively outputs the second audio signal and a mute circuit that mutes the audio signal switched and output by the signal switching unit. An audio system for use, the battery line for supplying power to the first and second audio signal reproduction devices, and the first audio signal reproduction device and the battery line, The second audio signal reproducing device is provided with a switching means for selectively supplying power to the audio signal reproducing device, and the second audio signal reproducing device includes a power source detecting part for detecting ON / OFF of an ignition switch, and the power source detecting part is an ignition switch. When on or off is detected,
And a control unit for turning on or off the switching means after operating the mute circuit.

<Operation> When the power supply detection unit detects that the ignition switch is on or off, the control unit of the second audio signal reproduction device is provided between the power supply of the first audio signal reproduction device after operating the mute circuit. The switching means is turned on or off to control the power input to the first audio signal reproducing device.

<Embodiment> FIG. 1 is a block diagram of a vehicle audio system of the present invention. In the figure, 1 is a genuine audio device which is pre-installed on a car console or the like,
2 is an audio device additionally attached to the genuine audio device, such as a CD player, 3 is an ignition control unit for controlling the power on / off of the genuine audio device, and 4 is the power input to each audio device.
The ignition switch 5 of the car to be turned off is an amplifier for amplifying the audio signal output of the CD player 2, and 6
Is a speaker.

Next, each part of the genuine audio device 1 will be described. Reference numeral 1A denotes an operation unit including a tuner 1B and various operation keys for operating the cassette tape control unit 1C, and 1D always receives power from a battery (not shown) regardless of whether the ignition switch 4 is on or off. At the same time, the first control unit 1E for controlling the tuner 1B and the cassette tape reproducing unit 1C based on the operation input information of the operation unit 1A is a display unit for displaying the reception frequency of the tuner 1B. L ₁
Is an audio signal line and is a genuine audio device 1
The audio signal output, that is, the reproduction signal of the tuner 1B or the reproduction signal of the cassette tape reproducing unit 1C is output to the CD player 2.

Next, each part of the CD player 2 will be described. Reference numeral 2A is a disc reproducing section for reproducing music information from a disc on which music information is recorded, and 2B is an operation section including various operation keys for operating the CD player 2. 2C is constantly supplied with power from the battery via the battery line B1 regardless of whether the ignition switch 4 is turned on or off, and the ignition switch 4 is turned on by the power detection unit 2D.
Is a second control unit that detects the on / off state of the disc and controls the disc reproducing unit 2A based on the operation input of the operating unit 2B.
2E is a source switching unit, which is an audio signal line L ₁
It has a function of selectively switching the audio signal input from the disc reproducing section 2A and the audio signal input from the disc reproducing section 2A by a switching signal of the second control section 2C according to an operation input of the operating section 2B. In the second controller 2C, the operation input of the CD player 2 is prioritized as the operation input. Therefore, while playing the genuine audio equipment 1,
When the CD player 2 is operated, the second control section 2C switches the source switching section 2E to the CD player output. A mute circuit 2F mutes the audio signal output switched by the source switching unit 2E. The CD player 2
Turn on / off the power input to the ignition switch 4
Is directly turned on and off, and the power input to the genuine audio device 1 is turned on and off by controlling the ignition control unit 3 by the second control unit 2C.

Next, the operation of the vehicle audio system according to the present invention will be described. Now, assume that the ignition switch 4 is turned on from the off state. Then, the power supply detection unit 2D detects that the power supply is on, and the second control unit 2C turns on the mute circuit 2F by this detection and mutes the audio signal output. After that, the second control unit 2C outputs a predetermined control signal to the ignition control unit 3 to turn on the ignition control unit 3, so that the genuine audio device 1 is supplied with power from the battery line B1. Therefore, even if pop noise is output from the audio signal line L ₁ when power is supplied to the genuine audio device 1, the audio output of the CD player 2 is muted, and the pop noise is amplified by the amplifier 5. There is no output from the speaker 6,
After that, by releasing the mute after a certain period of time, the genuine audio device 1 and the CD player 2 can be used normally by operating the operation unit 1A or the operation unit 2B.

Further, when the ignition switch 4 is turned off from the on state, first, when the power supply detection unit 2D detects that the power supply is off, the second control unit 2C operates the mute circuit 2F to mute the audio signal output, and then the ignition signal is output. A predetermined control signal is output to the control unit 3 to turn off the ignition control unit 3.
Therefore, even if pop noise is output from the audio signal line L ₁ when the power of the genuine audio device 1 is cut off, the mute circuit 2F of the CD player 2 is on, so the pop noise is amplified by the amplifier 5 and the speaker 6
No more output. Further, after the power is turned off, the first control unit 1D and the second control unit 2C stand by while waiting for power input. When the ignition switch 4 is turned on, the CD player 2 may be turned on with a predetermined delay time after the genuine audio device is turned on first. Further, when the ignition switch 4 is turned off, the genuine audio device 1 may be configured to be turned off after the CD player 2 is turned off. The ignition control section 3 may be built in the CD player 2.

<Effects of the Invention> As described above, according to the present invention, in the vehicle audio system including the combination of the first and second audio signal reproducing devices, the switching means is provided between the signal reproducing device and the power source, and the ignition switch On / off is detected by the power supply detection unit, and the switching means is turned on or off after the mute circuit is operated based on the detection result.
You can prevent pop noise that occurs when the power is turned on and off when another non-genuine audio device is attached.

[Brief description of drawings]

FIG. 1 is a block diagram of a vehicle audio system according to the present invention. 1 ... Genuine audio equipment, 7 ... Ignition switch, 8 ... CD player, 11 ... Power detection section, 12 ... Second control section, 15 ... Mute circuit, 16 ... Ignition control section.

Claims (1)

[Scope of utility model registration request] 1. A first for reproducing and outputting a first audio signal
An audio signal reproducing apparatus, a second audio signal reproducing section for reproducing a second audio signal, a first audio signal input from the first audio signal reproducing apparatus via an audio signal line, and In-vehicle audio comprising a second audio signal reproducing device including an audio signal switching section for selectively outputting two audio signals and a mute circuit for muting the audio signal switched and output by the signal switching section. In the system, a battery line for supplying power to the first and second audio signal reproducing devices, and the first audio signal provided between the first audio signal reproducing device and the battery line. Switching means for selectively supplying power to the reproduction device, the second audio signal The playback device includes a power source detection unit that detects whether the ignition switch is on or off, and when the power source detection unit detects that the ignition switch is on or off, the switching unit is turned on or off after operating the mute circuit. An in-vehicle audio system, comprising: