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Loudspeaker device

A loudspeaker and subtractor technology, applied in the direction of frequency/direction characteristic devices, sensors, transducer circuits, etc., can solve problems such as difficult control and large feedback, and achieve the effect of stable characteristics

Inactive Publication Date: 2002-10-30
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, even if the oscillation margin is taken into consideration, large feedback is not possible, and it is difficult to effectively control from low frequency to acoustic tube resonance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Fig. 1 is a block diagram of an acoustic circuit according to Embodiment 1 of the present invention, Fig. 2 is a characteristic diagram of an acoustic output, a is a sound pressure characteristic, and b is a phase characteristic. Next, the overall structure of the speaker device will be described with reference to FIG. 1 .

[0040] In the figure, 1 is a speaker unit, 2 is an acoustic tube coupled with the front of the speaker unit 1, 4 is a microphone installed in the acoustic tube 2, the sound wave emitted from the speaker unit 1 is detected by the microphone 4 inside the acoustic tube 2, Input to the subtractor 6 through the high-pass filter 7, at the same time, the signal detected by the microphone 4 is directly input to the subtractor 6, mixed with the signal from the outside, the input signal is corrected, amplified by the power amplifier 13, and input to the speaker Unit 1.

[0041] The relationship between the speaker unit 1 and the acoustic tube 2 is that the a...

Embodiment 2

[0045] Fig. 3 is the block diagram of the acoustic circuit of other embodiment of the present invention, Fig. 4 (A) is the microphone output signal characteristic figure, Fig. 4 (B) is the sound output characteristic figure, a is the sound pressure characteristic, b is the phase characteristic. Only the difference from Embodiment 1 will be described. The acoustic output signal detected by the microphone 4 is connected to the subtractor 6 through two high-pass filters 7 and 8 connected in parallel to form a negative feedback circuit. 7 is a 2nd-order high-pass (-12dB / oct) filter, and 8 is a 1st-order high-pass (6dB / oct) filter.

[0046] FIG. 8(A) is a frequency characteristic of a conventional microphone signal, and low-frequency components are enhanced by feedback up to low frequencies. However, in this embodiment, as shown in FIG. 4 , the level of the low-frequency components is lowered, and enhancement of the low-frequency components cannot be performed.

[0047] In additio...

Embodiment 3

[0050] Fig. 5 is the block diagram of the acoustic circuit of other embodiment of the present invention, Fig. 6 (A) is the microphone output signal characteristic diagram, Fig. 6 (B) is the acoustic output characteristic diagram, a is the sound pressure characteristic, b is the phase characteristic. Only the difference from Embodiment 1 will be described. A secondary high-pass filter 7 for processing the output signal detected by the microphone 4 is connected and the output signal is connected to the subtractor 6. At the same time, the output signal of the aforementioned microphone 4 will be processed. The (-12dB / oct) or (-6dB / oct) low-pass filter 9 is connected to the subtractor 6 to form a negative feedback circuit.

[0051] By means of taking out low-frequency components by this low-pass filter 9 and performing phase compensation, a loudspeaker device with excellent acoustic characteristics can be provided. The filter 7 performs acoustic tube resonance independently, can be...

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Abstract

A loudspeaker device for use in various sound apparatus such as a television receiver, having an acoustic pipe disposed in front of a speaker unit, the acoustic pipe being provided with a microphone for detecting sounds reproduced by the speaker unit. The sounds reproduced by the speaker unit are corrected by the signals detected by the microphone to provide flattened sound output characteristics. The speaker device comprises a power amplifier (13) to which an input signal is delivered via a subtracter (6), a speaker unit (1) for reproducing output signals delivered from the power amplifier (13), an acoustic pipe (2) coupled in front of the speaker unit (1) for guiding the sound waves, a microphone (4) for detecting an acoustic outputs radiated from the speaker unit (1), and a microphone amplifier (5) for amplifying an acoustic output signals detected by the microphone (4). Output signals of the microphone amplifier (5) are delivered to the subtracter (6), at the same time the same output signal is connected to a high-pass filter (7) to be delivered to the subtracter (6). Thus a negative feedback circuit is formed to suppress peaks and dips for providing a flattened sound pressure frequency characteristic. <IMAGE>

Description

technical field [0001] The present invention relates to speaker devices used in various audio equipment and television sets, and more particularly to an acoustic tube coupled to the front of the speaker unit and a microphone for detecting the reproduced sound from the speaker unit installed in the acoustic tube and corrected by using the detection signal. A speaker device for reproducing sound of the aforementioned speaker unit. Background technique [0002] Such a conventional speaker device will be described with reference to FIG. 7 , FIG. 8(A) and FIG. 8(B). 7 is a block diagram, FIG. 8(A) is a microphone output signal diagram, and FIG. 8(B) is a sound output characteristic diagram, where a represents the sound pressure characteristic and b represents the phase characteristic. [0003] In the figure, 1 is a speaker unit that generates sound waves, and this speaker unit 1 is coupled to an acoustic tube 2 . In order to suppress resonance, sound-absorbing materials (not sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R1/02H04R3/00H04R3/04
CPCH04R3/002
Inventor 田中秀和今野文靖
Owner PANASONIC CORP
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