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condenser microphone

A microphone and capacitor technology, which is applied in the circuit field of capacitor microphone polarization voltage compensation, to achieve the effect of cost saving

Active Publication Date: 2012-02-15
AKG ACOUSTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is also not possible to compensate for sensitivity tolerances in the case of different directional characteristics

Method used

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Examples

Experimental program
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Embodiment Construction

[0039] figure 1 Shown is a block diagram of the main elements of a microphone according to the invention. Such as Figure 5 The phantom power supply of the microphone shown is performed by a phantom power unit 31 via feed resistors 32, 33 of the same magnitude, which are arranged in a 3-pole, for example XLR plug, in or in front of the hybrid meter Behind the plug 4. Figure 5 Such a phantom power supply is shown. According to this standard, three phantom power supplies are possible: The relevant values ​​of the feed resistors for 12-V, 24-V or 48-V supplies are 680Ω, 1.2kΩ or 6.8kΩ respectively. Here lines 1 and 2 represent the cable conductors powered by the phantom power unit; line 3 represents the ground wire which is normally connected to the ground cable shield. Via the audio cable, ie via lines 1 , 2 and resistors 5 and 6 , phantom power unit 31 is connected to the input of power supply circuit 11 according to the invention. Capacitor 7 smoothes the supply voltage...

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Abstract

The invention relates to a capacitor microphone comprising at least one microphone capsule (9). <??>The invention is characterized in that the capacitor microphone comprises at least one circuit for regulating the polarization voltage, where the circuit for the regulation of the polarization voltage comprises an analog regulation loop (48) supplied with an unregulated voltage, and a digital regulation loop (47), in that the digital regulation loop (47) comprises a control electronics (39), for example a microcontroller or a CPLD, that provides, to the analog regulation loop (48), a desired value for the polarization voltage, which is calculated using correction factors, and in that, for the purpose of feedback, the output of the analog regulation loop (48) is connected with a control electronics (39).

Description

technical field [0001] The invention relates to a circuit for polarizing voltage compensation of a capacitor microphone. Background technique [0002] Power supply for microphones is conventionally provided by a power supply, for example using a mixer. During phantom powering, the positive pole of the feed voltage is achieved through two identical feed-line resistors on the two cable conductors of the audio cable. The return current flows through a third conductor connected to the electrical connector 1 of the XLR plug. In order to efficiently use the voltage supplied when powering the phantom power supply of a condenser microphone, the current consumption of the microphone should be as small as possible in order to prevent excessive voltage drops across the feeder resistance. A condenser microphone with 48-V has a maximum current draw of 10 mA. This phantom power supply is standardized here according to DIN EN 61938 (formerly IEC 268). [0003] Microphones mainly use c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R19/04H04R19/00H04R3/06
CPCH04R19/04
Inventor I·W·朗
Owner AKG ACOUSTICS