File:Microphone - Bayernhof Museum - DSC06319.JPG
Page contents not supported in other languages.
Tools
Actions
General
In other projects
Appearance
Size of this preview: 424 × 599 pixels. Other resolutions: 170 × 240 pixels | 340 × 480 pixels | 544 × 768 pixels | 725 × 1,024 pixels | 1,450 × 2,048 pixels | 3,154 × 4,453 pixels.
Original file (3,154 × 4,453 pixels, file size: 3.33 MB, MIME type: image/jpeg)
This is a file from the Wikimedia Commons. Information from its description page there is shown below. Commons is a freely licensed media file repository. You can help. |
Summary
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 |
Licensing
I, the copyright holder of this work, hereby publish it under the following license:
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 |
Items portrayed in this file
depicts
Wikimedia username<\/a>"}},"text\/plain":{"en":{"":"Wikimedia username"}}},"{\"value\":\"Daderot\",\"type\":\"string\"}":{"text\/html":{"en":{"P4174":"Daderot<\/a>","P2093":"Daderot"}},"text\/plain":{"en":{"P4174":"Daderot","P2093":"Daderot"}}},"{\"value\":{\"entity-type\":\"property\",\"numeric-id\":2699,\"id\":\"P2699\"},\"type\":\"wikibase-entityid\"}":{"text\/html":{"en":{"":"URL<\/a>"}},"text\/plain":{"en":{"":"URL"}}},"{\"value\":\"https:\\\/\\\/commons.wikimedia.org\\\/wiki\\\/user:Daderot\",\"type\":\"string\"}":{"text\/html":{"en":{"P2699":"https:\/\/commons.wikimedia.org\/wiki\/user:Daderot<\/a>"}},"text\/plain":{"en":{"P2699":"https:\/\/commons.wikimedia.org\/wiki\/user:Daderot"}}},"{\"value\":{\"entity-type\":\"property\",\"numeric-id\":2093,\"id\":\"P2093\"},\"type\":\"wikibase-entityid\"}":{"text\/html":{"en":{"":"author name string<\/a>"}},"text\/plain":{"en":{"":"author name string"}}}}" class="wbmi-entityview-statementsGroup wbmi-entityview-statementsGroup-P170 oo-ui-layout oo-ui-panelLayout oo-ui-panelLayout-framed">
copyrighted, dedicated to the public domain by copyright holder<\/a>"}},"text\/plain":{"en":{"P6216":"copyrighted, dedicated to the public domain by copyright holder"}}}}" class="wbmi-entityview-statementsGroup wbmi-entityview-statementsGroup-P6216 oo-ui-layout oo-ui-panelLayout oo-ui-panelLayout-framed">
Creative Commons CC0 License<\/a>"}},"text\/plain":{"en":{"P275":"Creative Commons CC0 License"}}}}" class="wbmi-entityview-statementsGroup wbmi-entityview-statementsGroup-P275 oo-ui-layout oo-ui-panelLayout oo-ui-panelLayout-framed">
18 May 2013
original creation by uploader<\/a>"}},"text\/plain":{"en":{"P7482":"original creation by uploader"}}}}" class="wbmi-entityview-statementsGroup wbmi-entityview-statementsGroup-P7482 oo-ui-layout oo-ui-panelLayout oo-ui-panelLayout-framed">
Sony Cyber-shot DSC-RX100<\/a>"}},"text\/plain":{"en":{"P4082":"Sony Cyber-shot DSC-RX100"}}}}" class="wbmi-entityview-statementsGroup wbmi-entityview-statementsGroup-P4082 oo-ui-layout oo-ui-panelLayout oo-ui-panelLayout-framed">
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 11:14, 31 October 2013 | 3,154 × 4,453 (3.33 MB) | Daderot | User created page with UploadWizard |
File usage
The following page uses this file:
Metadata
This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.
If the file has been modified from its original state, some details may not fully reflect the modified file.
Camera manufacturer | SONY |
---|---|
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 |
|
Image compression mode | 2 |
APEX brightness | −3.75234375 |
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 |