JP3180273U - High stroke reduction after vibration speaker box - Google Patents

Abstract

Provided is a high-stroke reduced after-vibration speaker box that enables a speaker box that realizes a high stroke of a diaphragm when excessive vibration noise is not produced while suppressing excessive vibration noise.
An acoustic input signal is input from an input terminal 1 via an AF amplifier 2, and a noise sound picked up from a condenser microphone 6 is inverted by an antiphase inversion circuit 8 and input to a canceling waveform synthesis circuit 9 simultaneously with the AF amplifier 2. To do. Further, the switching mode processor unit 10 determines whether there is a noise noise, and the aluminum thin film plate 13 that is in close contact with the diaphragm 5 from the braking coil 4 by the output of the canceling waveform synthesizing circuit 9 for DC voltage or braking is reversed or forward. A high-stroke reduced after-vibration speaker box that suppresses after-vibration noise and increases stroke efficiency by applying force.
[Selection] Figure 1

Description

  The present invention relates to an acoustic box device that can make maximum use of a high-efficiency speaker that does not produce excessive resonance in an acoustic speaker box.

When an acoustoelectric signal is input, there is a problem in the acoustic speaker box due to the difference in frequency between the vibration generated by the diaphragm of the speaker and the resonance box, and an unbalanced vibration sound can be heard. There was a problem to prevent.

Even if the vibration of the speaker efficiently vibrates, there is a problem that it is difficult to reproduce a low sound range, for example, a heavy bass sound of about 20 Hz, and only a simulated sound far from the original sound due to restrictions such as the capacity of the sound box.

Recently, the importance of miniaturization of acoustic stereos has been emphasized, and so the miniaturization of acoustic boxes has been demanded. In addition, it is required to improve acoustic performance, and technical development is required.

Therefore, when inputting an acoustoelectric signal to a speaker, the sound is picked up by a high-performance microphone externally, an error signal is detected compared to the input signal, and the speaker vibration is braked to suppress unnecessary vibration. An object of the present invention is to provide a high-stroke-reduction vibration speaker box that enables reproduction with an increased stroke rate using an electromagnet or the like in front of the diaphragm when error vibration is small.

A high-stroke reduced after-vibration speaker box according to claim 1 of the present invention is a noise and sound signal picked up from a condenser microphone provided in a cabinet of a speaker box, while an acoustic input signal is passed from an input terminal to a moving coil through an AF amplifier. From the mixed electrical signal, the electrical signal to which the acoustic signal is input and the output of the condenser microphone are phase-inverted from the anti-phase inversion circuit, and this signal and the acoustic signal from the AF amplifier are simultaneously canceled and input to the waveform synthesis circuit. Further, only the noise signal is mixed and enters the braking coil, and the noise is applied to the aluminum thin plate provided on the diaphragm so as to prevent excessive vibration noise from being generated.

The high stroke reduced after-vibration speaker box according to claim 2 of the present invention is the high stroke reduced after-vibration speaker box according to claim 1, when no noise sound is generated outside, the switching mode processor applies a DC voltage from the DC terminal to the braking coil via the electronic relay. In addition, the stroke rate of the speaker is increased.

If excessive vibration sound is generated when sound comes out of the speaker box, the sound is not output to the outside by the braking coil, and a DC voltage is applied to the braking coil otherwise. It is possible to enhance the low frequency range by increasing the stroke efficiency.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram of a configuration of an electric circuit in the acoustic box. 1 inputs an audio signal at an input terminal. Amplified by being connected to a 2AF amplifier, the output is connected to a 3 moving coil.

The moving coil 3 is in close contact with the diaphragm 12. As a result, the sound that is converted into sound and goes outside is picked up by a 6-capacitor microphone provided on the sound collection surface, connected to a 7-microphone amplifier, amplified and connected to an 8 antiphase inversion circuit, and picked up from a 6-capacitor microphone. Invert the sound waveform. On the other hand, the output signal from the 2AF amplifier is added to the 9 cancellation waveform synthesis circuit together with the output from the 8 reverse phase inversion circuit. The signal from the 9 cancellation waveform synthesis circuit determines whether or not there is a distortion signal corresponding to the error signal in the 10 switching mode processor section.

On the other hand, when the 2AF amplifier is connected to the 16 first electronic relay unit and the 10 switching mode processor unit determines that the distortion signal is present, the 16 first electronic relay unit opens and 9 canceling waveforms are generated. A signal from the synthesis circuit passes and is output to the four braking coils.

The 4 braking coils brake the 13 aluminum thin film plate in a direction opposite to the moving direction of the 3 moving coils so as not to generate excessive vibration noise.

In FIG. 2, it is a figure which shows the effect | action of 3 moving coils, 4 braking coils, and 15 drive magnets. As shown in the figure, considering that the magnetic pole moves to the left and right direction against the 15 moving magnet on the 3 moving coil as shown in the figure, the 4 braking coil works in the opposite direction to the magnetic pole of the 3 moving coil, so that the braking force acts as the braking force. To do. This is a case of P input. This is a case where an error signal is input when the first electronic relay unit is opened.

Next, when the 9-switch mode processor unit does not detect an error signal in FIG. 1, a DC is applied to the DC terminal, and the DC is switched to 4 via the second electronic relay unit 17 and the moving coil unit is replaced with an electromagnet. Increase the swing width. This increases the stroke efficiency of the 12 diaphragm.

As a result, when the Q input is applied, the braking coil portion is operated in the same direction as the three moving coils, and the diaphragm moves efficiently, thereby reproducing a deep bass sound.

In FIG. 3, the external sound is a mixture of noise sound and audio output, picked up by a microphone, processed by the 11 electronic circuit block unit, the sound pressure from the 3 moving coils and 12 diaphragms provided on the speaker, and the 4 braking coils. The braking force prevents extra vibration from coming out as sound in the room where the speaker box is placed.

It is a figure of the whole structure of the speaker box of this invention. It is a figure which shows the effect | action of a braking coil part and a moving coil. It is a figure of the noise control circuit which goes outside.

DESCRIPTION OF SYMBOLS 1 Input terminal 2 AF amplifier 3 Moving coil 4 Braking coil 5 Drive magnet 6 Condenser microphone 7 Microphone amplifier 8 Reverse phase inversion circuit 9 Cancellation waveform synthesis circuit 10 Switching mode processor 11 Electronic circuit block part 12 Diaphragm 13 Aluminum thin film board 14 Speaker Box unit 15 Drive magnet 16 First electronic relay 17 Second electronic relay

Claims (2)

An acoustic signal is input from the input terminal to the moving coil via an AF amplifier, an electric signal such as an audio signal from an electric signal mixed with noise and an acoustic signal picked up from the condenser microphone provided in the box of the speaker box unit, and the output of the condenser microphone Inverts the phase with an anti-phase waveform circuit that reverses the phase, and simultaneously cancels the output signal and the acoustic signal from the AF amplifier by overlapping the waveforms with the circuit, and the switching mode processor detects the presence of the output signal and the electronic relay unit A high-stroke reduced after-vibration loudspeaker box characterized in that an excess vibration noise is eliminated by a direct current or an electric signal to be controlled on an aluminum thin film plate provided on the diaphragm in the braking coil. 2. The high stroke according to claim 1, wherein when no noise sound is generated outside, the switching mode processor increases the stroke rate of the speaker so that a DC voltage is applied from the DC terminal to the braking coil via the electronic relay. Reduced extra vibration speaker box.

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