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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates
generally to a vehicle audio system generally referred to as a car stereo, and more particularly to
failure diagnosis technology in a system equipped with a large number of amplifier and speaker
systems. (Conventional technology) In recent vehicle acoustic devices, left and right front
speakers for stereo reproduction, rear speakers, speakers for reproducing reverberation and
surround sound effects, and speakers for reproducing deep bass, etc. A multi-speaker system
having six or more channels of amplifier ス ピ ー カ speaker systems for amplifying an acoustic
signal and generating sound in a vehicle compartment has become widespread. (Problems to be
Solved by the Invention) In a device having six or more amplifier / speaker systems, failures such
as circuit failure of the amplifier, disconnection or contact failure of complicatedly wired wires,
disconnection of the voice coil of the speaker, etc. The probability of occurrence of Moreover, in
a multi-speaker system provided with a large number of amplifier and speaker systems, even if
there is a failure that there is no sound from one of the speakers, the occurrence of the failure
can be judged by the ear if the entire playback atmosphere is not sensed There are many things
that can not be done. Therefore, there is a problem that the system continues to be used as it is
incomplete, and it becomes accustomed to the incomplete reproduction sound and can not make
full use of the system capability. The present invention has been made in view of the abovedescribed conventional problems, and its object is to automatically detect and notify a user of a
failure in a multi-speaker system having a large number of amplifier-speaker systems. An audio
device is provided. (Means for Solving the Problems) In the present invention, therefore, each
amplifier / speaker system is provided with test sound generating means for sequentially
inputting a test sound signal to the speaker system alternately in each amplifier and a
microphone installed in the vehicle compartment. And the fault detection means for detecting the
amplifier / speaker system in which the test sound is not generated although the test sound
signal is input, and the detected fault content is notified And notification means for (Operation) If
each amplifier / speaker system is all normal, a test sound is alternatively produced in the vehicle
cabin from each speaker according to the operation of the test sound generating means, and the
test sound is collected by the microphone It is determined that there is no failure. When a test
sound signal is input to an amplifier-speaker system having the test sound generating means, if
the test sound signal is not included in the microphone output, it is determined that the amplifier
/ speaker system is broken And inform the user about that.
(Embodiment) FIG. 1 shows a schematic configuration of a vehicle acoustic device according to
an embodiment of the present invention. A stereo signal from a source 1 such as a tuner, a tape
player, a CD player, etc. is supplied to each amplifier / speaker system of the multi-speaker
system through a control amplifier 2. The amplifiers A1 and A2 drive the left and right front
speakers SPI and SF3, respectively. The amplifiers A3 and A4 drive the left and right rear
speakers SP3 and SF3, respectively. Also, in response to the sound signal passed through the
surround circuit 3, the left and right speakers SP5 and SF3 for surround sound effect
reproduction are respectively driven by the amplifiers A5 and A6. Six switches SW1 to SW6 of
the switching circuit 4 are interposed in the input stage of each of the amplifiers A1 to A6. The
switching circuit 4 is controlled by a switching signal from the test circuit 6. During normal
operation, the switches SW1 to SW6 are respectively connected to the control amplifier 2 side,
and during the failure detection operation described below, the switches SWI to SW6 is
alternatively connected to the test sound signal output side of the test circuit 6 in order. Further,
microphones 5 for collecting sounds generated from the respective speakers SPI to SP 6 are
installed in the vehicle interior, and the microphone outputs are manually input to the test circuit
6. Further, the test circuit 6 is connected to a display 7 as means for notifying of the content of
the failure, and a reset switch 8 described later. The control amplifier 2 and the test circuit 6
exchange control signals as follows. In this embodiment, a failure detection operation is
performed as an initial process when the power supply to the apparatus is turned on by
operating the power switch of the control amplifier 2. The test circuit 6 responds to the power
supply, and first generates a predetermined test sound signal and supplies it to the switching
circuit 4 in a state where the acoustic output of the control amplifier 2 is zero. At the same time,
the six switches SW1 to SW6 of the switching circuit 4 are alternately switched in order at a
constant time interval, and test sound signals are alternately sequentially input to the six
amplifiers A1 to A6. Then, in parallel with this operation, the output of the microphone 5 is
monitored to check whether the output includes the test sound signal generated by itself. If all
six amplifier / speaker systems are normal, a test sound is emitted into the vehicle cabin in the
order of SP1 SP2 SP3 SP4 5P5-5P6, and the microphone 5 picks up the test sound. In 6, it can be
seen that there is no failure in any of the systems.
Also, when the test sound signal is input to the amplifier A4 by switching the switch SW4, if the
test sound signal is not included in the output of the microphone 5, the sound from the speaker
SP4 is due to the failure of the system of the amplifier A4 or the speaker SP4. It can be
determined that it has not come out. In this case, the test circuit 6 causes the display 7 to
indicate that no sound is output from the speaker SP4 to notify the user. At this time, an alarm
sound such as a buzzer may be generated at the same time. Then, when a failure is detected as
described above, the output of the control amplifier 2 is kept at zero until the user presses the
reset switch 8, and even if the sound signal from the source 1 is input to the control amplifier 2,
all speakers SPI No sound is generated from ~ SP6, and the user is made to surely recognize that
a failure has occurred. (Effects of the Invention) As described above in detail, in the vehicle
acoustic device according to the present invention, test sound signals are alternatively generated
sequentially from a large number of amplifier and speaker systems, and test sound signals are
generated in order. A sound is collected by a microphone to check if it is not or not, and a
configuration is added to notify the user if there is a failure. [5] Therefore, even in a multispeaker system of 6 channels or more, the user can Even if you do not perform any troublesome
operations, you can reliably detect that there is no sound from a certain speaker, so enjoy playing
music safely as if the system is operating normally until the failure is reported. Can.
Brief description of the drawings
FIG. 1 is a schematic block diagram of a vehicle acoustic device according to an embodiment of
the present invention.
4 · · · · · · Switching circuit
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