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The proper German term is Zweikanalton. If there are no objections, I'll move this over in the next couple of days. See de:Zweikanalton

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How it works

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“It can carry either a completely separate audio program, or be used for stereo sound transmission. In the latter case, the first FM carrier carries L+R for compatibility, while the second carrier carries 2*R (not L-R.)”

Does this mean that it carries 1 left channel & 2 right channels, so that the 2 right channels decode as the stereo audio? --Mahmudmasri (talk) 10:38, 26 July 2009 (UTC)[reply]__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2009-07-26T10:38:00.000Z","author":"Mahmudmasri","type":"comment","level":1,"id":"c-Mahmudmasri-2009-07-26T10:38:00.000Z-How_it_works","replies":[]}}-->

To answer your question: the 2R just means twice the voltage of signal level (+6dB) so as to match the signal level of the L+R or mono carrier. There are only 2 sound carriers transmitted conventionally in Zweiton. The Left is re-derived by subtracting or phase canceling the Right back away from the Left+Right (channel mixing). — Preceding unsigned comment added by Teknikingman (talk • contribs) 08:13, 20 February 2011 (UTC)[reply]__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2011-02-20T08:13:00.000Z","author":"Teknikingman","type":"comment","level":1,"id":"c-Teknikingman-2011-02-20T08:13:00.000Z-How_it_works","replies":[]}}-->