JPH079519Y2 - Speaker failure diagnosis device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a speaker failure diagnosis device in a loudspeaker system.

(Prior art and its problems) Speakers in loudspeaker audio equipment are often installed in high places such as poles or ceilings and at distant places, and it has been very difficult to find and check for failures. Conventionally, the failure diagnosis of the speaker has been a diagnosis of disconnection of the voice coil. However, in the case of a speaker failure, in addition to the disconnection of the voice coil, the damage of the cone paper and the abnormal contact of the vibrating part, the deterioration of the sound quality and the occurrence of the abnormal sound are judged from a distant place by the sense of hearing. However, there is a drawback that the judgment based on the auditory sense can be made only in a state where the deterioration of the speaker is considerably advanced.

(Means for Solving the Problems) In order to solve these drawbacks, the present invention is designed to prevent the natural resonance of the vibrating section composed of the speaker cone paper, the voice coil and the damper from causing damage to the cone paper and the vibrating section. In the case of abnormal contact or the like, attention is paid to the change compared with the normal state, and the failure is diagnosed by detecting this change, which will be described in detail below with reference to the drawings.

(Embodiment) FIGS. 1 and 2 show a block diagram and a waveform diagram of a speaker failure diagnosis apparatus according to the present invention.

In FIG. 1, 1 is a speaker, 2 is an oscillator, 3 is a series resistor inserted between the oscillator 2 and the speaker 1 via a switching relay for switching between the speaker line and the failure diagnosis device, 5 is a buffer amplifier, and 6 is a buffer amplifier. A / D converter, 7 is CPU, 8
Is a storage unit, 9 is an interface unit for controlling the oscillator 2 and the switching relay 4, 10 is a display unit, and 11 is an operation unit. The oscillator 2 to the operation unit 11 constitute the failure diagnosis device of the present invention.

The CPU 7 is started by the operation unit 11 and the interface unit 9
When the switching relay 4 is driven through the speaker 1, the speaker 1 is connected to the failure diagnosis device, and the signal A (FIG. 2) from the oscillator 2 is applied to the speaker 1 through the series resistor 3, the result is shown in FIG. Signal B appears at both ends of the speaker 1. This signal B
Is amplified by the buffer amplifier 5, the output of the buffer amplifier 5 is converted into a digital signal by the A / D converter 6 and is taken into the CPU 7, and is stored in the storage unit 8 as a waveform in a normal state.

Next, if the speaker 1 is out of order, the CPU 7 is activated by the series of operations described above, and the phase difference between the waveform data taken in and the data stored in the normal state is compared to determine the failure. At this time, if there is a phase difference equal to or larger than a predetermined correction value, it is determined that the speaker 1 has an abnormality, and the diagnostic result is displayed on the display unit 10 via the interface unit 9. The correction value may not always match the data initially stored in the normal state and the data in the failure diagnosis, and the correction value is also included in the comparison. FIG. 2 shows a signal when the speaker 1 fails.

(Effects of the Invention) As described above, the speaker failure diagnosis apparatus according to the present invention can confirm the operating condition of the speaker at any time periodically by using the CPU to set the initial data of the speaker. This has the advantage of being able to reliably detect abnormalities such as wire breaks, and is effective for loudspeaker audio systems that use a large number of speakers in halls, theaters, event halls, and the like.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a waveform diagram for explaining FIG. 1 ... Speaker, 2 ... Oscillator, 3 ... Series resistance, 4 ... Switching relay, 5 ... Buffer amplifier, 6 ... A / D converter, 7 ... CPU,
8 ... storage unit, 9 ... interface unit, 10 ... display unit, 11
… Operation part.

Claims (1)

[Scope of utility model registration request] 1. An oscillator, means for adding an output signal from the oscillator to a speaker through a series resistor, means for storing a normal resonance signal of a natural resonance signal of a voice coil of the speaker, and the stored means. Compare the normal signal of the speaker and the signal at the time of failure of the speaker and the means for comparing the signal stored in the normal state of the speaker with the correction value included in the signal stored during normal operation Means to do
A speaker failure diagnosis device, comprising: a display unit for displaying the compared signals.