File:Microphone - Bayernhof Museum - DSC06319.JPG
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[edit]DescriptionMicrophone - Bayernhof Museum - DSC06319.JPG |
English: Exhibit in the Bayernhof Museum, 225 St. Charles Place, O'Hara Township, Pittsburgh, Pennsylvania, USA. Photography was permitted in the museum without restriction. This is a Western Electric double-button carbon microphone, invented at Bell Laboratories in the early 1920s Extremely widely used in broadcasting until the 1930s, it is also called the "ring and spring" microphone because the microphone unit is suspended by springs at the center of a support ring to isolate it from vibrations of the stand. Inside the microphone unit there is a stiff aluminum diaphragm with two cylindrical chambers or "buttons" with carbon granules between two electrodes, attached to each side of the diaphragm. The button pickups are connected to a center-tapped audio transformer in a "push-pull" circuit, which cancels the high 2nd harmonic distortion due to carbon's nonlinear response to pressure, and the thin diaphragm had high resonant frequency and was damped by an air cell to reduce it's Q, resulting in a much flatter frequency response and lower distortion than other carbon microphones. |
Date | |
Source | Own work |
Author | Daderot |
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This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. |
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse |
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current | 11:14, 31 October 2013 | 3,154 × 4,453 (3.33 MB) | Daderot (talk | contribs) | User created page with UploadWizard |
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Camera manufacturer | SONY |
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Camera model | DSC-RX100 |
Author | Picasa |
Exposure time | 1/30 sec (0.033333333333333) |
F-number | f/1.8 |
ISO speed rating | 200 |
Date and time of data generation | 16:04, 18 May 2013 |
Lens focal length | 10.4 mm |
Horizontal resolution | 350 dpi |
Vertical resolution | 350 dpi |
Software used | DSC-RX100 v1.00 |
File change date and time | 06:38, 31 October 2013 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.3 |
Date and time of digitizing | 16:04, 18 May 2013 |
Meaning of each component |
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Image compression mode | 2 |
APEX brightness | −3.75234375 |
APEX exposure bias | 0 |
Maximum land aperture | 1.6953125 APEX (f/1.8) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash fired, strobe return light detected, compulsory flash firing |
Supported Flashpix version | 1 |
Color space | sRGB |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 28 mm |
Scene capture type | Standard |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Unique image ID | d4dc237de12fec42dd7752f3e9f805af |
IIM version | 4 |