JPH11146496A - Method and device for speaker abnormality detection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to detect the abnormality of disconnection and erroneous connection in a speaker or speaker wiring by detecting abnormality of the speaker under generation state of an electromotive force of the speaker generated by an air pressure change in a vehicle by an opening and closing of a door. SOLUTION: At the time of inspection, a window attains closed state, a power source switch of audio equipment attains open state (the power source off) and each input terminal of speakers 21 to 24 is connected to an abnormality detection amplifier 4 by a relay switch 3. When the door is opened or closed, oscillation plates of speakers 21 to 24 oscillate by the air pressure change in the vehicle and an electromotive force is generated from a speaker coil. Under normal state, this electromotive force is amplified by the amplifier 4, an output of a comparator 5 becomes a high potential signal, an indicator lamp 6 lights and notifies that the speaker is in normal state. When there are abnormalities such as disconnection or erroneous connection, The electromotive force inputted to the amplifier 4 is low and the output of the comparator 5 becomes a low potential signal, the indicator lamp 6 does not turn on and the abnormality of the speaker circuit is notified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker abnormality detecting device for detecting an abnormality of a speaker of an audio device or the like mounted on a vehicle, for example, an abnormality of the speaker itself or an abnormality of a connection cable of the speaker.

[0002]

2. Description of the Related Art The operation of a speaker of an audio device mounted on a vehicle is confirmed (for example, inspection of a finished product by an automobile manufacturer) by actually generating sound from the audio device and listening by a human. In a system in which a plurality of speakers are installed, sound is sequentially output from a single speaker by a balance adjustment function or a fader adjustment function of the audio device, and whether or not the sound is normally output from the speaker being output is determined. Inspection is underway. In addition, the sound pressure sensor is brought close to the front of each speaker without depending on human hearing to check whether sound is normally output from the speakers.

[0003]

However, the above-described method of checking the speaker circuit has a problem that an inspection error occurs and that it takes time to adjust the balance and fader because the method relies on human hearing. Further, in the method using the sound pressure sensor, it is necessary to perform the inspection by sequentially bringing the sound pressure sensor close to each speaker, and there is a problem that it takes time and effort.

An object of the present invention is to solve the above problems.

[0005]

According to the present invention, there is provided a speaker abnormality detecting apparatus for detecting an abnormality of a speaker mounted on a vehicle, which is generated by a pressure change in the vehicle due to opening and closing of a door. An abnormality of the speaker is detected based on a state of occurrence of an electromotive force of the speaker.

In a loudspeaker abnormality detecting apparatus for detecting an abnormality of a speaker mounted on a vehicle, a comparing means for comparing an electromotive force generated by the speaker with a predetermined value; It is characterized by comprising switch means for connecting the comparing means, and notifying means for notifying whether or not the speaker is normal based on the comparison result of the comparing means.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a speaker abnormality detecting device according to the present invention, and FIG. 2 is an explanatory diagram showing a mounting position of the speaker abnormality detecting device according to the present invention. In the present embodiment, a four-channel audio device will be described in which two speakers are provided on the left and right sides of each of the front seat and the rear seat, and the volume of the speakers can be individually adjusted by balance control and fader control. .

The mounting position of the speaker abnormality detecting device shown in FIG. 1 is audio equipment 10 mounted in an instrument panel of a vehicle. 11, 12, 13,
Reference numeral 14 denotes a final-stage amplifier built in the audio device 10, that is, an amplifier capable of driving a speaker from an audio signal from a CD player or the like, and has four channels. 21, 22, 23, and 24 are amplifiers 11, 1
A speaker connected to each of the outputs 2, 13, and 14 by a connection cable 20.
It is embedded in the front left (FL), rear right (RR) and rear left (RL) doors, etc.
The audio signals amplified in 2, 13, and 14 are reproduced.

Reference numeral 3 denotes a relay switch serving as a switch means, which is disposed near the output terminal of each of the amplifiers 11, 12, 13, and 14, that is, built in the audio equipment main body 10. When the power of the audio device 10 is turned off (when the power switch is turned off), the positive and negative input terminals of the speakers 21, 22, 23, and 24 are connected to the positive and negative input terminals of the amplifier 4 for the abnormality detection device. When the power is connected to the audio equipment (when the power switch is turned on), the input terminals of the speakers 21, 22, 23, and 24 are connected to the amplifiers 11, 12, 13, and 14, respectively. ing. Reference numeral 4 denotes an amplifier for detecting an abnormality of the speaker.
By vibrating the diaphragms 1, 22, 23, 24,
Amplify the generated electromotive force. Reference numeral 5 denotes a comparator which is a comparing means for comparing the output voltage of the amplifier 4 with a predetermined reference voltage (Vr), and outputs a high potential signal when the output voltage of the amplifier 4 is high. An indicator lamp 6 is connected to the comparator 5 and is turned on when an output signal (high-potential signal) from the comparator 5 is input, and is configured to notify that the speaker is normal. . The relay switch 3, the amplifier 4, the comparator 5, and the indicator lamp 6 are all built in the audio device main body 10.

Next, the operation of the speaker abnormality detecting device according to the present embodiment will be described. At the time of inspection, the window is closed, and the power switch of the audio device is opened (power off). In this state, the speakers 21, 22, 23, 24
Are connected to a speaker abnormality detection amplifier 4 by a relay switch 3. When the door is opened and closed, the pressure in the vehicle changes and the speakers 21, 22, 2
The diaphragms 3 and 24 vibrate, and an electromotive force is generated from the speaker coil. In a normal state, the electromotive force is amplified by the amplifier 4, and when the electromotive force is input to the comparator 5, the output of the comparator 5 becomes a high potential signal, and the indicator lamp 6 is turned on to notify that the speaker is normal. Conversely, if the speaker circuit (speakers 21, 22, 23, 24 or speaker connection cable 20) has an abnormality such as disconnection or incorrect connection, the amplifier 4
Is low, and the output of the comparator 5 is a low-potential signal, so that the indicator lamp 6 is not turned on to notify that the speaker circuit is abnormal.

As described above, the loudspeaker abnormality detecting apparatus of this embodiment focuses on the fact that when the door is opened and closed, an electromotive force is generated in the loudspeakers 21, 22, 23, and 24 due to a change in the pressure in the vehicle interior. When a predetermined amount of electromotive force is generated from the speaker, the speaker circuit can be determined to be normal, and abnormality in the speaker circuit can be easily detected. In this embodiment, the indicator lamp 6 is provided separately.
It is also possible to use the power indicator of the above.

The position of the speaker is not limited to the position shown in this embodiment, but may be applied to any position in the vehicle compartment. Further, in the present embodiment, the abnormality is determined based on the sum of the electromotive forces of all the speakers. However, the abnormality can be detected by separately determining the electromotive force of each speaker.

[0013]

As described above, according to the speaker abnormality detecting apparatus of the present invention, the speaker can be operated in a simple operation of opening and closing the door without relying on human hearing and without troublesome adjustment of balance or fader. Continuity can be checked, and abnormalities such as disconnection and incorrect connection in the speaker and the speaker wiring can be detected.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a speaker abnormality detection device according to the present invention.

FIG. 2 is an explanatory diagram showing a mounting position of a speaker abnormality detection device according to the present invention.

[Explanation of symbols]

 11 ··· Amplifier (FR) 12 ··· Amplifier (FL) 13 ··· Amplifier (RR) 14 ··· Amplifier (RL) 21 ··· Speaker (FR) 22 ··· Loudspeaker (FL) 23 ... Loudspeaker (RR) 24 Loudspeaker (RL) 3 ... Relay switch 4 ... Amplifier (for abnormality detection device) 5 ... Comparison Table 6 Indicator lamp

Claims (2)

[Claims] 1. A speaker abnormality detecting device for detecting abnormality of a speaker mounted on a vehicle, wherein the abnormality of the speaker is detected based on a state of generation of an electromotive force of the speaker caused by a pressure change in the vehicle due to opening and closing of a door. A method for detecting a speaker abnormality. 2. An apparatus for detecting abnormality of a speaker mounted on a vehicle, comprising: comparing means for comparing an electromotive force generated by the speaker with a predetermined value; A speaker abnormality detection device comprising: switch means for connecting the comparison means; and notification means for notifying whether or not the speaker is normal based on a comparison result of the comparison means.