Low-frequency effects

A LFE ( " Low Frequency Effects " Dolby or "Low Frequency Enhancement " at DTS) is in various multi-channel audio (eg 5.1 ) are used to low-frequency sounds that can not be localized by the human ear to transmitted.

To keep the data current is small, has this channel usually only a limited bandwidth of 20 to 100 Hz Therefore, the LFE channel is not count as a full channel in the designation of multi -channel sound systems, but characterized by an appended " .1" ( for example, " 5.1 ").

Originally, the LFE channel was introduced to provide the cinema a single large subwoofer behind the screen with their own signals. This made it possible to reproduce very low sounds to have to be dimensioned so great without all the speakers and amplifier. In addition, it was possible to regulate the bass separately, without affecting other frequencies in the low-, mid - or high-frequency range.

A special feature of the LFE channel of the spread exclusively in the cinema format Sony Dynamic Digital Sound ( SDDS) is to be regarded, as also on the LFE channel full bandwidth is transmitted. Also in the DVD-A has the sixth channel (LFE ) full range and can be used for other purposes, such as a signal for the "direction height " used.