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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram showing a conventional
method of calibrating a sound level meter, and FIG. 2 is a sectional view of an embodiment of the
present invention. 11 is an outer case J, 12 ti inner case, 13 is an insulating support, 14 Fi back
electrode, 15 is a vibrating membrane, 16, IT is a support ring, 18 is a grid, 19 is an insulator.
Paper 2 Figure-45-
DETAILED DESCRIPTION OF THE INVENTION This invention relates to the improvement of a
condenser microphone, and in particular, provides an arrangement capable of performing
acoustic calibration accurately with simple operation in a state of being connected to an
instrument. It is. As a method of simple calibration of absolute value of noise level meter etc. In
some cases, the output of an oscillator of constant amplitude is replaced with microphone
sensitivity. That is, as shown in FIG. Amplifier circuit 3.5. Correction circuit 4. Rectifier circuit
Simple one-word division of a sound level meter consisting of an indicator 7 and a microphone 8
etc .; correct the output of the microphone 8 by the correction jI, the output of the microphone 8
is mixed with the oscillator lO, a constant amplitude force oscillation output In addition, the
instruction side “·” 41 dial 2 is adjusted for calibration. This method has a drawback that a
microphone is not included in the calibration element, and as a method to compensate for this
lack, one with a sound source of constant sound pressure -1 · · An apparatus that generates a
constant sound pressure for use in this Are commercially available. When the microphone is a co
/ tensor type, an appropriate electrode can be brought close to the sound source parallel to the
previous part of the microphone's vibrating cavity, and this electrode can be calibrated by
applying a constant voltage. , Known as the Actiator Act. Conventionally, with this -r 法 method.
コンテンサマイクロホンのグリッドをはすし。 Calibration was carried out by applying a
separately prepared electrode with a slit to the microphone. This device is capable of performing
the calibration accurately with a simple operation without the need to prepare another electrode
by modifying the conventional one described in H. The embodiment of FIG. 2 will be described, In
the inner case 12 inserted into the outer case 11, the insulating support 13 is interposed: 2) The
back electrode 14 is supported, and a certain gap is provided on the L surface of the back + IJL
14 so that the vibrating membrane 15 is In the support 12 provided with the upper ridge 12A of
the sleeve 12 and the support ring 16.17, the grid 18 which is a conductor and has a large
number of through holes is connected to the main body through the insulator 19 to form the
crystal face 18A and the vibrating membrane A constant gap is formed between them. By
applying the predetermined voltage to the grid with the above-described configuration of the
discrete-type microphone, it becomes possible to perform on-the-fly calibration including the
microphone. Also, one factor to determine the calibration level is the distance between the
diaphragm and the grid, which is one factor: ', i, which is always constant, it suffices to apply a
constant voltage, which is significantly easier than before. Calibration can be done by operation. 1: As stated, this device has a simple structure.
It has greatly simplified the calibration operation, and it has a large practical effect.
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