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Capacitive microphone device and its connector

A technology of condenser microphone and connecting device, which can be applied to electrical components, sensor protection circuits, electrostatic transducer microphones, etc., and can solve problems such as long wire lengths

Inactive Publication Date: 2005-04-20
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the length of the wire is long and arranged so that the high-frequency voltage can be easily superimposed
Therefore it is possible to handle this situation with only conventional measures such as bypass capacitors

Method used

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  • Capacitive microphone device and its connector
  • Capacitive microphone device and its connector
  • Capacitive microphone device and its connector

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0051] image 3 Is a circuit diagram of the condenser microphone device in the first embodiment of the present invention; image 3 The difference from the circuit diagram of the conventional condenser microphone device shown in FIG. 2 is that a series resistor 24 is added. image 3 In the condenser microphone unit 10b shown in the figure, the series resistor 24 is inserted between the drain of the field effect transistor 19 and the microphone signal output terminal 22.

[0052] A series resistor 24 is provided to limit the harmonic current, and in the case of a high-frequency equivalent circuit, it is connected in series with the series resonant circuit composed of the microphone signal output transmission line 31 and the bypass capacitor 21. Since the effective series resistance of the bypass capacitor 21 is equal to or less than 1 ohm, the resistance value of the series resistance 24 is selected between tens of ohms to hundreds of ohms, and the resonance current of the micropho...

no. 2 example

[0055] Figure 4 Is a circuit diagram of the condenser microphone device in the second embodiment of the present invention; Figure 4 The difference from the circuit diagram of the conventional condenser microphone device shown in FIG. 2 is that a damping resistor 25 and a blocking capacitor 26 are added. in Figure 4 In the condenser microphone unit 10c shown in, the damping resistor 25 and the blocking capacitor 26 for blocking direct current are connected in series, and the series circuit is connected in parallel with the drain and source of the field effect transistor 19. A damping resistor 25 and a blocking capacitor 26 are provided to dampen the parallel resonance, and are placed in parallel with the parallel resonance circuit composed of the microphone signal output transmission line 31 and the bypass capacitor 21 according to the high-frequency equivalent loop. Since the effective series resistance of the bypass capacitor 21 is equal to or less than 1 ohm, the impedance w...

no. 3 example

[0058]Fig. 5 is a circuit diagram of a conventional condenser microphone unit and the connecting device (connector) in the third embodiment of the present invention. In FIG. 5, the series resistance 27 is included in the connecting device 40a. Both ends of the series resistor 27 are connected to the connector signal input terminal 41 and the connector signal output terminal 43. The microphone signal output terminal 22 and the microphone common output terminal 23 of the condenser microphone unit 10a are connected to the connector signal input terminal 41 and the connector common input terminal 42, respectively. The connector signal output terminal 43 and the connector common output terminal 44 are respectively connected to the microphone signal output terminal transmission line 31 and the common terminal (ground) on the motherboard of a cellular phone or similar device, and constitute a condenser microphone device, and a load The resistor, the power source 33 and the amplifier 34 w...

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PUM

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Abstract

Condenser microphone devices used in radio devices to reduce noise generated by high frequency signal radiation from transmission units. A series resistor is provided between the bypass capacitor provided between the drain and the source of the field effect transistor and the microphone signal transmission line to prevent high-frequency voltage rise due to resonance between the bypass capacitor and the microphone signal output transmission line. Therefore, noise generated by high-frequency signal radiation can be reduced.

Description

Technical field [0001] The present invention relates to a condenser microphone device that converts sound vibration into an electric signal, and more particularly to a device having an impedance converter therein. Background technique [0002] Generally speaking, a condenser microphone device is composed of a condenser microphone unit, a microphone signal output transmission line, a load resistor, a power supply, and similar components. [0003] To date, the condenser microphone device has a problem in that when it is used in a cellular phone or the like, noise is generated due to radiation of high-frequency signals generated by the transmission unit. As a measure to prevent this problem, such as condenser microphone devices, a known method is to provide a bypass capacitor between the source and drain of the internal field effect transistor. [0004] First, the structure of the condenser microphone unit in the conventional condenser microphone device will be described with refere...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R19/04
CPCH04R3/007H04R19/04
Inventor 池田雅春
Owner PANASONIC CORP
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