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Original file (SVG file, nominally 606 × 643 pixels, file size: 16 KB)
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Summary
| Description |
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. |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 20:54, 4 April 2018 | | 606 × 643 (16 KB) | Retired electrician | |
| 18:18, 4 April 2018 |  | 606 × 643 (16 KB) | Retired electrician | {{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,... | |
| 18:16, 4 April 2018 |  | 605 × 643 (26 KB) | Retired electrician | {{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,... |
File usage
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