File:Blumlein shuffler principle 2 of 4.svg
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Size of this PNG preview of this SVG file: 562 × 599 pixels. Other resolutions: 225 × 240 pixels | 450 × 480 pixels | 720 × 768 pixels | 960 × 1,024 pixels | 1,921 × 2,048 pixels | 603 × 643 pixels.
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English: The Blumlein shuffler is an analog processor that extracts left-right phase differences and converts them to left-right level difference. It was suggested by Alan Blumlein in his landmark UK patent 394325 as a tool for preserving stereo information otherwise lost during playback through loudspeakers. There are four steps (1) take the original L+R stereo signal (2) convert L,R to M(id) and S(ide) signals through plain addition/subtraction. M and S are, by design, spaced by exactly 90 degrees (3) shift S 90 degrees, so it becomes in phase with M. This step could only be approximated through all-pas filtering, but it somehow worked in Blumlein's hands (4) add/subtract M(id) and shifted S"(ide) to create new L and R channels. The same principle is used in analog Dolby pro-logic circuitry to steer signal into central channel. |
| Date | |
| Source | Own work |
| Author | Retired electrician |
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This work is ineligible for copyright and therefore in the public domain because it consists entirely of information that is common property and contains no original authorship. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 20:53, 4 April 2018 | | 603 × 643 (21 KB) | Retired electrician (talk | contribs) | |
| 18:15, 4 April 2018 |  | 603 × 643 (22 KB) | Retired electrician (talk | contribs) | {{Information |Description={{en|The ''Blumlein shuffler'' is an analog processor that extracts left-right phase differences and converts them to left-right level difference. It was suggested by Alan Blumlein in his landmark UK patent 394325 as a tool for preserving stereo information otherwise lost during playback through loudspeakers. There are four steps<br>(1) take the original L+R stereo signal<br>(2) convert L,R to M(id) and S(ide) signals through plain addition/subtraction. M and S are,... |
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