JP6418823B2 - Speaker diagnosis apparatus and speaker diagnosis method - Google Patents

Description

  The present invention relates to a speaker diagnosis device that is driven by a sound signal supplied through an amplifier and emits a sound based on the sound signal, and a diagnosis method for the speaker.

  Conventionally, for example, a speaker diagnostic device described in Patent Document 1 is known. In this speaker diagnostic apparatus, an M-sequence signal that is a spread code is given to a speaker to be inspected (active speaker), and sound based on the M-sequence signal emitted from the speaker is collected by a microphone. Then, the signal characteristic of the collected sound is analyzed, and the deterioration or change of the speaker is diagnosed by comparing the signal characteristic with the signal characteristic obtained and stored in the same manner when the speaker is shipped.

JP 2012-227857 A

  However, the above-described conventional speaker diagnostic apparatus must collect the actual sound emitted from the speaker with a microphone. For this reason, for example, diagnosis must be performed under a special environment such as a low level of external sound. For example, it is not possible to accurately perform diagnosis of a speaker used in an audio device mounted on a vehicle. .

  The present invention has been made in view of such circumstances, and provides a speaker diagnosis apparatus and method capable of accurately diagnosing a speaker regardless of the level of external sound.

  A speaker diagnosis apparatus according to the present invention is a speaker diagnosis apparatus that emits sound based on a sound signal driven by a sound signal given through an amplifier, and opens a circuit that supplies the sound signal to the speaker. A signal blocking circuit for blocking the sound signal for the speaker, and when the diagnostic sound signal is provided to the speaker, when the signal blocking circuit blocks the diagnostic sound signal for the speaker, Waveform information acquisition means for acquiring waveform information representing a voltage waveform caused by the generated electromotive force, and determining whether the waveform information acquired by the waveform information acquisition means is good or bad based on a predetermined reference And a determination unit.

  With such a configuration, when the signal blocking circuit opens the circuit that supplies the diagnostic sound signal to the speaker and blocks the sound signal to the speaker while the diagnostic sound signal is supplied to the speaker, the diaphragm An electromotive force is generated in the speaker with the attenuation of the vibration. And the waveform information showing the voltage waveform resulting from the said electromotive force depending on the vibration attenuation | damping aspect of the said diaphragm is acquired, and the quality of the voltage waveform is determined as the quality of the said speaker based on a predetermined reference | standard.

  In the speaker diagnostic apparatus according to the present invention, the speaker diagnostic apparatus includes a storage unit that stores, as reference waveform information, the waveform information to be acquired by the waveform information acquisition unit with respect to a normal speaker, and the determination unit is configured as the predetermined reference. The waveform information can be determined based on a comparison result between the reference waveform information stored in the storage unit and the waveform information acquired by the waveform information acquisition unit.

  With such a configuration, the diagnostic object is based on the comparison result between the waveform information obtained when the diagnostic sound signal is cut off for a normal speaker and the waveform information obtained similarly for the speaker to be diagnosed. The quality of the waveform information obtained for the speaker to be determined is determined as the quality of the speaker to be diagnosed.

  In the speaker diagnostic apparatus according to the present invention, the speaker is included in an alarm device, and is driven by an alarm sound signal having a predetermined frequency to emit an alarm sound based on the alarm sound signal. Can be used as the diagnostic sound signal.

  With such a configuration, it is possible to determine the quality of a speaker for generating an alarm sound in the alarm device using an alarm sound signal having a predetermined frequency that is normally used in the alarm device.

  In the speaker diagnostic apparatus according to the present invention, the signal cutoff circuit may include a switch circuit provided in a circuit from the amplifier to the speaker.

  With such a configuration, the switch circuit opens the circuit from the amplifier to the speaker, so that the diagnostic sound signal for the speaker via the amplifier is cut off.

  In the speaker diagnostic apparatus according to the present invention, the amplifier includes a switching circuit that performs an on / off operation, and the signal cutoff circuit includes the switching circuit in the amplifier, and the switching circuit performs an off operation on the speaker. It can be set as the structure which interrupts | blocks a sound signal.

  With such a configuration, by turning off the switching circuit of the amplifier, the circuit leading to the speaker is opened, and the diagnostic sound signal through the amplifier for the speaker is blocked.

  In the speaker diagnostic apparatus according to the present invention, the waveform information acquisition means includes envelope information acquisition means for acquiring envelope information representing an envelope of a voltage waveform caused by the electromotive force generated in the speaker as the waveform information. It can be configured.

  With such a configuration, envelope information representing the envelope of the voltage waveform resulting from the electromotive force of the speaker accompanying attenuation of the vibration of the diaphragm when the diagnostic sound signal for the speaker is interrupted is acquired as voltage waveform information. The And the quality of the envelope information is determined as the quality of the speaker based on a predetermined standard.

  A speaker diagnosis apparatus according to the present invention is a speaker diagnosis apparatus that emits sound based on a sound signal driven by a sound signal given through an amplifier, and opens a circuit that supplies the sound signal to the speaker. A signal blocking circuit for blocking the sound signal to the speaker, a sampling circuit for sampling a terminal voltage value of the speaker, and the signal switched from a sound signal supply state in which a diagnostic sound signal is supplied to the speaker First terminal voltage value acquisition means for acquiring a terminal voltage value sampled by the sampling circuit in a sound signal cutoff state in which a cutoff circuit cuts off the diagnostic sound signal for the speaker; and the first terminal voltage value acquisition means From the terminal voltage value acquired in step 1, the voltage waveform caused by the electromotive force generated in the speaker in the sound signal cutoff state First waveform information acquisition means for acquiring the waveform information to be represented, and first determination means for determining the quality of the waveform information acquired by the first waveform information acquisition means based on a predetermined reference as the quality of the speaker It becomes the composition which has.

  With such a configuration, when the sound signal supply state in which the diagnostic sound signal is provided to the speaker is switched to the sound signal cutoff state in which the diagnostic sound signal for the speaker is blocked by the signal cutoff circuit, the diaphragm An electromotive force is generated in the speaker with the attenuation of the vibration. And the terminal voltage value of the said speaker sampled in the said sound signal interruption | blocking state is acquired. From the terminal voltage value, waveform information representing a voltage waveform resulting from the electromotive force generated in the speaker is acquired, and whether the voltage waveform is good or bad is determined as good or bad on the basis of a predetermined reference.

  In the speaker diagnostic apparatus according to the present invention, the speaker diagnostic apparatus includes a storage unit that stores, as reference waveform information, the waveform information to be acquired by the first waveform information acquisition unit for a normal speaker, and the first determination unit includes the first determination unit, A configuration in which the quality of the waveform information is determined based on a comparison result between the reference waveform information stored in the storage unit as a predetermined reference and the waveform information acquired by the waveform information acquisition unit. it can.

  With such a configuration, comparison between waveform information obtained in a sound signal cut-off state in which a diagnostic sound signal is cut off for a normal speaker and waveform information obtained in a sound signal cut-off state in the same manner for a speaker to be diagnosed Based on the result, the quality of the waveform information in the sound signal cutoff state obtained for the speaker to be diagnosed is determined as the quality of the speaker to be diagnosed.

  In the speaker diagnostic apparatus according to the present invention, a second terminal voltage value acquisition unit that acquires a terminal voltage value sampled by the sampling circuit in the sound signal supply state, and acquired by the second terminal voltage value acquisition unit A second determination unit that determines the quality of a circuit including the amplifier and the speaker based on a terminal voltage value may be employed.

  With this configuration, the terminal voltage value of the speaker sampled in the sound signal supply state where the diagnostic sound signal is supplied to the speaker is acquired, and the quality of the circuit including the amplifier and the speaker is determined based on the terminal voltage value. Is determined. In the sound signal supply state, for example, the quality of the circuit due to the presence or absence of an amplifier failure and the quality of the circuit due to the presence or absence of a short circuit of the speaker can be determined.

In the speaker diagnostic apparatus according to the present invention, when the second determination unit determines that the circuit including the amplifier and the speaker is good, the first terminal voltage value acquisition unit, the first waveform information acquisition unit, and the first It can be set as the structure which has a control means to perform the quality determination of the said speaker by a determination means.

  With such a configuration, when it is determined that the speaker is good based on the terminal voltage value of the speaker sampled in the sound signal supply state, the speaker terminal voltage value sampled in the sound signal cutoff state The quality of the speaker is determined based on the above.

  A speaker diagnosis method according to the present invention is a method for diagnosing a speaker that is driven by a sound signal given through an amplifier and emits a sound based on the sound signal, and opens a circuit that supplies the sound signal to the speaker. A signal blocking circuit for blocking the sound signal for the speaker, and the speaker when the signal blocking circuit blocks the diagnostic sound signal for the speaker in a state where the diagnostic sound signal is provided to the speaker. A waveform information acquisition step for acquiring waveform information representing a voltage waveform due to an electromotive force generated in the waveform, and determining whether the waveform information acquired in the waveform information acquisition step based on a predetermined reference is good or bad as the speaker And a determination step.

The speaker diagnostic method according to the present invention is a speaker diagnostic method that is driven by a sound signal given through an amplifier and emits a sound based on the sound signal, and includes a circuit that supplies the sound signal to the speaker. Switching from a sound signal supply state in which a diagnostic sound signal is provided to the speaker using a signal blocking circuit that opens and blocks the sound signal to the speaker and a sampling circuit that samples a terminal voltage value of the speaker A first terminal voltage value obtaining step for obtaining a terminal voltage value sampled by the sampling circuit in a sound signal cut-off state in which the signal cut-off circuit cut off the diagnostic sound signal for the speaker; and the first terminal from the terminal voltage value acquired by the voltage value acquiring step, the electromotive generated in the loudspeaker in the sound signal interruption state First waveform information acquisition step for acquiring waveform information representing a voltage waveform resulting from the above, and determining whether the waveform information acquired in the first waveform information acquisition step based on a predetermined reference is good or bad as the speaker And a first determination step.

  According to the speaker diagnosis apparatus and the speaker diagnosis method of the present invention, the signal cutoff circuit outputs the diagnosis sound signal in a state where the diagnosis sound signal is provided to the speaker without collecting the sound emitted from the speaker. Since the circuit for the speaker is opened and the sound signal to the speaker is cut off, it is possible to judge the quality of the speaker, so that the speaker can be diagnosed accurately regardless of the level of the external sound. Can do.

It is a block diagram which shows the speaker diagnostic apparatus which concerns on one Embodiment of this invention. It is a timing chart which shows the waveform of the terminal voltage of a speaker, and each control signal at the time of the diagnosis of a speaker. It is a flowchart which shows the flow of the diagnostic process performed with the control circuit in the speaker diagnostic apparatus shown in FIG. It is a circuit block diagram which shows the specific structural example of amplifier.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The speaker diagnostic apparatus according to the present invention is configured as shown in FIG. The speaker diagnostic apparatus shown in FIG. 1 determines (diagnosis) the quality of the speaker 14 used for outputting an alarm sound in an alarm device mounted on a vehicle.

  In FIG. 1, the alarm device includes an alarm sound generation circuit 11, an amplifier (power amplifier) 12, and a speaker 14. In the circuit connecting the amplifier 12 and the speaker 14, a switch circuit 13 (a component of the speaker diagnostic device) is provided. In this alarm device, when an abnormality is detected in the operation of the in-vehicle device or the vehicle state, the alarm sound generation circuit 11 is activated to output an alarm sound signal. The alarm signal is amplified by the amplifier 12 and supplied to the speaker 14 via the switch 13 in the on (closed) state. The speaker 14 is driven based on a given warning sound signal and emits a warning sound based on the warning sound signal. This warning sound allows the vehicle occupant to know that there is an abnormality in the operation of the in-vehicle device, the vehicle state, or the like.

  The speaker 14 is originally used in, for example, an in-vehicle audio device, and is shared by the in-vehicle audio device and the alarm device.

  The diagnosis device for the speaker 14 used in the alarm device includes a control circuit 20, a sampling circuit 21, a storage unit 22, a first alarm lamp 23a, and a second alarm lamp 23b in addition to the switch circuit 13 (signal cutoff circuit) described above. have. The sampling circuit 21 includes an A / D conversion circuit, and supplies a terminal voltage value (digital value) obtained by sampling the terminal voltage of the speaker 14 at a predetermined cycle to the control circuit 20. As will be described later, the storage unit 22 stores reference waveform information (reference envelope information) that is a determination criterion for pass / fail.

  The control circuit 20 controls the output and blocking of the warning sound signal as the diagnostic sound signal from the warning sound generation circuit 11 by the warning sound generation control signal Sarm. Further, the control circuit 20 controls opening (ON) and closing (OFF) of the switch circuit 13 by the switch control signal Ssw. The control circuit 20 controls the alarm sound generation circuit 11 and the switch circuit 13 and controls the speaker based on the terminal voltage value of the speaker 14 sequentially supplied from the sampling circuit 21 and the reference waveform information stored in the storage unit 22. The process which concerns on the quality determination of 14 is performed. And based on the result of the quality determination of the speaker 14, the control circuit 20 performs lighting control of the 1st warning lamp 22a and the 2nd warning lamp 22b.

  The alarm sound generation control signal Sarm, the switch control signal Ssw, and the terminal voltage of the speaker 14 output from the control circuit 20 when diagnosing the speaker 14 are as shown in FIG. 2, for example.

  In FIG. 2, when the switch circuit 13 controlled by the switch control signal Ssw is in an on (closed) state, the alarm sound generation circuit 11 controlled by the alarm sound generation control signal Sarm from the time to has a predetermined amplitude and a predetermined frequency. When an alarm sound signal (diagnostic sound signal) is output, the speaker 14 that inputs the alarm sound signal via the amplifier 12 and the switch circuit 13 emits an alarm sound based on the alarm sound signal if normal. At this time, the terminal voltage of the speaker 14 becomes a waveform (voltage waveform) with a predetermined amplitude Sa and a predetermined frequency.

  The switch circuit 13 controlled by the switch control signal Ssw is turned off (opened) at time ts after the alarm sound generation period Tarm when the alarm sound signal is output from the alarm sound generation circuit 11 from time to. When the output of the alarm sound signal from the alarm sound generation circuit 11 that is switched and controlled by the alarm sound generation control signal Sarm is stopped, the circuit between the amplifier 12 and the speaker 14 is opened, The alarm sound signal for the speaker 14 is blocked. Then, the vibration of the diaphragm of the speaker 14 that is driven by the alarm sound signal and vibrates with a constant amplitude is gradually attenuated and stops. In the process in which the vibration of the diaphragm of the speaker 14 is attenuated, an electromotive force corresponding to the vibration of the diaphragm is generated by the electromagnetic action between the voice coil of the speaker 14 and the magnetic circuit. If the speaker 14 is normal, due to the electromotive force, the terminal voltage of the speaker 14 gradually decreases while oscillating from the time ts when the alarm sound signal is cut off.

  In general, since the output impedance of the amplifier (power amplifier) 12 is low, the terminal voltage of the speaker 14 gradually decreases without rapidly decreasing.

  When the control circuit 20 controls the alarm sound generation circuit 11 and the switch circuit 13 by the alarm sound generation control signal Sarm and the switch control signal Ssw as described above, the terminal voltage of the speaker 14 that changes as shown in FIG. The terminal voltage values from the sampling circuit 21 to be sampled are sequentially stored in the internal memory. Specifically, from the time to when the alarm sound signal is given to the speaker 14 and the alarm sound is emitted from the speaker 14 to the time ts when the alarm sound signal for the peaker 14 is cut off, and further from the time ts to a predetermined diagnosis time. The terminal voltage values of the speakers 14 sampled by time te after Tex has elapsed are stored in the internal memory.

  The control circuit 20 samples from the time to when the alarm sound generation control signal Sarm is started up to the time ts after which the switch control signal Ssw is lowered and from the time ts to the time te after the diagnosis time Tex has passed. When the stored terminal voltage value of the speaker 4 is stored in the internal memory, the speaker diagnosis process is executed according to the procedure shown in FIG.

  In FIG. 3, the control circuit 20 uses the terminal voltage value stored in the internal memory to sample the terminal voltage sampled from the time to when the alarm sound generation control signal Sarm is raised to the time ts when the switch control signal Ssw is lowered. The value is extracted from the terminal voltage value stored in the internal memory (S11: second terminal voltage value acquisition means), and the amplitude value Sa (the amplitude value Sa of the alarm sound signal (FIG. 2) is calculated from the extracted terminal voltage value. Equivalent to (see)) is calculated (S12). Then, the control circuit 20 determines whether or not the amplitude value Sa is smaller than a predetermined reference amplitude value So (S13: second determination means).

  If the amplitude value Sa is greater than or equal to the reference amplitude value So (NO in S13), for example, the amplifier 12 is normal and the speaker 12 is not short-circuited, and the circuit including the amplifier 12 and the speaker 14 is normal. If it is determined that a normal terminal voltage is obtained, the control circuit 20 further samples from the time ts when the switch control signal Ssw is lowered to the time te after a predetermined diagnostic time Tex has elapsed. The terminal voltage value thus obtained is extracted from the terminal voltage value stored in the internal memory (S14: first terminal voltage value acquisition means). The extracted terminal voltage value corresponds to the gradually decreasing terminal voltage shown in FIG. 2, and the control circuit 20 calculates envelopes ENVa and ENVb representing the voltage waveform of the gradually decreasing terminal voltage. (S15: first waveform information acquisition means). As a result, the control circuit 20 acquires envelope information (voltage waveform information) representing the envelopes ENVa and ENVb (waveform information acquisition means / envelope information acquisition means).

  By the way, the envelope information (voltage waveform information) obtained by the same method for the normal speaker 14 is stored in advance in the storage unit 22 as reference envelope information (reference voltage waveform information). Then, the control circuit 20 compares the obtained envelope information with the reference envelope information stored in the storage unit 22, and determines whether the envelope information is normal based on the comparison result. (S16, S17: determination means / first determination means). For example, whether the envelope information is normal depending on whether or not the envelope band represented by the obtained envelope information is included in the envelope band centered on the envelope represented by the reference envelope information Even if it is determined whether or not, the characteristic information of the envelope represented by the envelope information (values at the start point, end point, intermediate point, etc.) and the reference envelope represented by the reference envelope You may make it determine whether the said envelope information is normal based on the comparison result with the same kind of feature information.

  When it is determined that the acquired envelope information is normal (good) (YES in S17), the control circuit 20 determines that the speaker 12 is normal, and the control circuit 20 determines both the first alarm lamp 23a and the second alarm lamp 23b. Is turned on (S20). The user can know that the speaker 14 is normal when both the first alarm lamp 23a and the second alarm lamp 23b are lit. On the other hand, if it is determined that the acquired envelope information is not normal (defect) (NO in S17), the control circuit 20 determines that the speaker 14 is abnormal (defect) and only the second alarm lamp 22b. Is turned on (S18).

  For example, when the vibration of the diaphragm of the speaker 14 after the interruption of the alarm sound signal is abnormal due to the deterioration of the diaphragm or damper of the speaker 14 or the malfunction of the voice coil, the envelope obtained from the terminal voltage value of the speaker 14 The shape of the line is different from the shape of the envelope represented by the reference envelope information about the normal speaker 14. In this case, it is determined that the speaker 14 is abnormal, and the second alarm lamp 23b is turned on. The user is informed that the speaker 14 is abnormal because only the second alarm lamp 23b is lit, and the cause is a mechanical abnormality such as deterioration of the diaphragm or damper, malfunction of the voice coil, or the like. I can know that.

  On the other hand, it is determined that the amplitude Sa calculated based on the terminal voltage value sampled from the time to when the alarm sound generation control signal Sarm is raised to the time ts when the switch control signal Ssw is lowered is smaller than the reference amplitude So. (YES in S13), the control circuit 20 turns on only the first alarm lamp 22a, assuming that the speaker 14 is abnormal (defective) (S19). In this case, since the amplitude of the waveform of the terminal voltage of the speaker 14 is smaller than the reference amplitude in a state where the alarm sound signal is supplied to the speaker 14, the amplifier 12 is not normal, the speaker 12 is short-circuited. There is a high possibility that the circuit including the amplifier 12 and the speaker 14 is abnormal. Therefore, the user can know that there is a high possibility that the circuit including the amplifier 12 and the speaker 14 is abnormal because only the first alarm lamp 23a is lit.

  According to the speaker diagnostic apparatus as described above, the switch circuit 13 is configured so that the alarm circuit (diagnostic sound signal) is provided to the speaker 14 without particularly collecting the sound emitted from the speaker 14. Since the circuit for supplying the sound signal (diagnostic sound signal) to the speaker 14 is opened and the alarm sound signal for the speaker 14 is cut off, the quality of the speaker 14 can be determined, regardless of the level of the external sound. Therefore, the speaker can be diagnosed with high accuracy. And the reliability of an alarm device can be maintained based on the diagnostic result.

  Further, since the alarm sound signal itself used in the alarm device is used as the diagnostic sound signal, it is not necessary to separately provide a circuit for outputting the diagnostic sound signal, and the circuit configuration can be simplified.

  As the amplifier 12, a class D amplifier including a PWM modulator 121, a power switching circuit 122, and an output filter 123 can be used as shown in FIG. In this case, without providing the switch circuit 13 shown in FIG. 1, the power switching circuit 122 opens the circuit that supplies the alarm sound signal (diagnostic sound signal) to the speaker 14 and blocks the alarm sound signal for the speaker 14. It can be used as a signal cutoff circuit. In this case, by fixing both the FET1 and FET2 included in the power switching circuit 122 to the OFF state, the circuit that supplies the alarm signal to the speaker 14 is opened.

  If the amplifier 12 is configured in this way (class D amplifier configuration), the switch circuit 13 is not necessary, and the circuit configuration can be further simplified.

  The speaker diagnosis device described above determines whether the speaker 14 that emits an alarm sound is good or bad in the alarm device, but the speaker to be diagnosed is not limited to the speaker applied to the alarm device.

  The speaker diagnosis apparatus and method according to the present invention has an effect that a speaker can be diagnosed with high accuracy regardless of the level of an external sound, and is driven by a sound signal supplied through an amplifier. It is useful as a diagnostic device for a speaker that emits sound based on the above and a diagnostic method for the speaker.

DESCRIPTION OF SYMBOLS 11 Alarm sound generation circuit 12 Amplifier 13 Switch circuit 14 Speaker 20 Control circuit 21 Sampling circuit 22 Memory | storage part 23a 1st alarm lamp 23b 2nd alarm lamp

Claims (16)

A speaker diagnostic apparatus that is driven by a sound signal given through an amplifier and emits a sound based on the sound signal,
A signal blocking circuit that opens a circuit for supplying the sound signal to the speaker and blocks the sound signal to the speaker;
Waveform information representing a voltage waveform caused by an electromotive force generated in the speaker when the signal cutoff circuit cuts off the diagnostic sound signal for the speaker in a state where the diagnostic sound signal is provided to the speaker. Waveform information acquisition means;
A speaker diagnosis apparatus comprising: a determination unit that determines whether the waveform information acquired by the waveform information acquisition unit based on a predetermined reference is good or bad. A storage unit for storing the waveform information to be acquired by the waveform information acquisition unit for normal speakers as reference waveform information;
The determination unit determines whether the waveform information is acceptable based on a comparison result between the reference waveform information stored in the storage unit as the predetermined reference and the waveform information acquired by the waveform information acquisition unit. The speaker diagnostic apparatus according to claim 1. The speaker is included in an alarm device and is driven by an alarm sound signal of a predetermined frequency to emit an alarm sound based on the alarm sound signal,
The speaker diagnostic apparatus according to claim 1, wherein the warning sound signal is used as the diagnostic sound signal.   The speaker diagnostic apparatus according to claim 1, wherein the signal cutoff circuit includes a switch circuit provided in a circuit from the amplifier to the speaker. The amplifier has a switching circuit that performs an on / off operation,
4. The speaker diagnosis apparatus according to claim 1, wherein the signal cutoff circuit includes the switching circuit in the amplifier, and shuts off a sound signal to the speaker by an off operation of the switching circuit. 5.   The said waveform information acquisition means has an envelope information acquisition means which acquires the envelope information showing the envelope of the voltage waveform resulting from the said electromotive force which arises in the said speaker as said waveform information. The speaker diagnostic apparatus according to the description. A speaker diagnostic apparatus that is driven by a sound signal given through an amplifier and emits a sound based on the sound signal,
A signal blocking circuit that opens a circuit for supplying the sound signal to the speaker and blocks the sound signal to the speaker;
A sampling circuit for sampling the terminal voltage value of the speaker;
A terminal that is sampled by the sampling circuit in a sound signal cut-off state in which the signal cut-off circuit that is switched from a sound signal supply state in which a diagnostic sound signal is supplied to the speaker cuts off the diagnostic sound signal to the speaker First terminal voltage value acquisition means for acquiring a voltage value;
First waveform information acquisition means for acquiring, from the terminal voltage value acquired by the first terminal voltage value acquisition means, waveform information representing a voltage waveform caused by an electromotive force generated in the speaker in the sound signal cutoff state;
A speaker diagnosis apparatus comprising: a first determination unit that determines whether the waveform information acquired by the first waveform information acquisition unit based on a predetermined reference is good or bad as the speaker. A storage unit for storing the waveform information to be acquired by the first waveform information acquisition unit for normal speakers as reference waveform information;
The first determination means determines whether the waveform information is acceptable based on a comparison result between the reference waveform information stored in the storage unit as the predetermined reference and the waveform information acquired by the waveform information acquisition means. The speaker diagnosis device according to claim 7, wherein Second terminal voltage value acquisition means for acquiring a terminal voltage value sampled by the sampling circuit in the sound signal supply state;
9. The speaker diagnosis apparatus according to claim 7, further comprising: a second determination unit that determines whether the circuit including the amplifier and the speaker is good or bad based on the terminal voltage value acquired by the second terminal voltage value acquisition unit. When the second determination unit determines that the circuit including the amplifier and the speaker is good, the first terminal voltage value acquisition unit, the first waveform information acquisition unit, and the first determination unit determine whether the speaker is good or bad. The speaker diagnosis apparatus according to claim 9, further comprising a control unit that performs the control.
A method for diagnosing a speaker that is driven by a sound signal given through an amplifier and emits a sound based on the sound signal,
Using a signal blocking circuit that opens the circuit for supplying the sound signal to the speaker and blocks the sound signal to the speaker,
Waveform information representing a voltage waveform caused by an electromotive force generated in the speaker when the signal cutoff circuit cuts off the diagnostic sound signal for the speaker in a state where the diagnostic sound signal is provided to the speaker. A waveform information acquisition step;
A speaker diagnosis method comprising: a determination step of determining whether the waveform information acquired in the waveform information acquisition step based on a predetermined reference is good or bad as the speaker. Using a storage unit that stores the waveform information to be acquired in the waveform information acquisition step for normal speakers as reference waveform information,
The determination step determines the quality of the waveform information based on a comparison result between the reference waveform information stored in the storage unit as the predetermined reference and the waveform information acquired in the waveform information acquisition step. The speaker diagnostic method according to claim 11. A method for diagnosing a speaker that is driven by a sound signal given through an amplifier and emits a sound based on the sound signal,
Using a signal blocking circuit that opens the circuit that supplies the sound signal to the speaker and blocks the sound signal to the speaker, and a sampling circuit that samples a terminal voltage value of the speaker,
A terminal that is sampled by the sampling circuit in a sound signal cut-off state in which the signal cut-off circuit that is switched from a sound signal supply state in which a diagnostic sound signal is supplied to the speaker cuts off the diagnostic sound signal to the speaker A first terminal voltage value acquisition step of acquiring a voltage value;
A first waveform information acquisition step for acquiring waveform information representing a voltage waveform caused by an electromotive force generated in the speaker in the sound signal cutoff state from the terminal voltage value acquired in the first terminal voltage value acquisition step ;
A speaker diagnosis method comprising: a first determination step of determining whether the waveform information acquired in the first waveform information acquisition step is good or bad based on a predetermined reference as the quality of the speaker.
Using a storage unit that stores the waveform information to be acquired in the first waveform information acquisition step as normal waveform information for a normal speaker,
In the first determination step, the waveform information is based on a comparison result between the reference waveform information stored in the storage unit as the predetermined reference and the waveform information acquired in the first waveform information acquisition step. The speaker diagnosis method according to claim 13, wherein the quality of the speaker is determined. A second terminal voltage value acquisition step of acquiring a terminal voltage value sampled by the sampling circuit in the sound signal supply state;
The speaker diagnosis method according to claim 13, further comprising a second determination step of determining whether the circuit including the amplifier and the speaker is good or bad based on the terminal voltage value acquired in the second terminal voltage value acquisition step. When the second determination step determines that the circuit including the amplifier and the speaker is good, the speaker pass / fail determination by the first terminal voltage value acquisition step, the first waveform information acquisition step, and the first determination step is performed. The speaker diagnosis method according to claim 15, further comprising a control step to be performed.

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