LFE channel

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An LFE channel ( “Low Frequency Effects” in Dolby or “Low Frequency Enhancement” in DTS ) is used in various multi-channel sound systems (e.g. 5.1 ) to produce low-frequency sounds that can not be localized by the human ear transfer.

In order to keep the data stream small, this channel usually only has a limited bandwidth of 20 to 100  Hz . For this reason, the LFE channel is not included in the designation of the multi-channel sound system as a full channel, but is identified by an appended “.1” (e.g. “5.1”).

The LFE channel was originally introduced to supply a single large subwoofer behind the screen with its own signals in the cinema . This made it possible to reproduce very deep tones without having to make all the speakers and amplifiers so large. In addition, it became possible to control the deep bass separately without affecting other frequencies in the low, mid or high range.

A special feature is the LFE channel of the Sony Dynamic Digital Sound (SDDS) format, which is only used in cinemas , since the full bandwidth is also transmitted on the LFE channel. The sixth channel (LFE) on the DVD-A also has full bandwidth and can also be used for other purposes, for example as a signal for the “directional altitude”.

literature

• Roland Enders: The home recording manual. The way to optimal recordings. 3rd, revised edition, revised by Andreas Schulz. Carstensen, Munich 2003, ISBN 3-910098-25-8 .
• Thomas Görne: Sound engineering. Fachbuchverlag Leipzig in Carl Hanser Verlag, Munich et al. 2006, ISBN 3-446-40198-9 .
• Hubert Henle: The recording studio manual. Practical introduction to professional recording technology. 5th, completely revised edition. Carstensen, Munich 2001, ISBN 3-910098-19-3 .