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The LFE channel is used to carry additional bass information in the Dolby Digital program, while the subwoofer output is bass information from up to all six channels that has been selected to be reproduced by the subwoofer via a bass management system.
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LFE and channel
As well, during the 1990s, DVDs were increasingly recorded with " surround sound " processes that included a Low-frequency effects ( LFE ) channel, which could be heard using the subwoofer in home theater systems.
In 1992, Dolby Digital's six-channel film sound format incorporated a single LFE channel, the " point one " in 5. 1 surround sound.
These configurations optionally include the extra low-frequency effects ( LFE ) channel.
refers to the LFE channel, which is also a discrete channel.
5. 1, offered 5. 1-channel support which adds a center channel speaker and LFE subwoofer output, most useful for movie watching.
( The ". 1 " denotes a Low-frequency effects channel ( LFE ) for bass and / or special audio effects.
Before the bass management system there is a Low Frequency Effects ( LFE ) channel.
A common misunderstanding is the belief that the LFE channel is the " subwoofer channel ".
The bass management system may direct bass to one or more subwoofers ( if present ) from any channel, not just from the LFE channel.
Also, if there is no subwoofer speaker present then the bass management system can direct the LFE channel to one or more of the main speakers.
The LFE channel was originally developed to carry extremely low " sub-bass " cinematic sound effects ( with commercial subwoofers sometimes going down to 30 Hz, e. g., the loud rumble of thunder or explosions ) on their own channel.
In the original movie theater implementation, the LFE was a separate channel fed to one or more subwoofers.
Home replay systems, however, may not have a separate subwoofer, so modern home surround decoders and systems often include a bass management system that allows bass on any channel ( main or LFE ) to be fed only to the loudspeakers that can handle low-frequency signals.
The salient point here is that the LFE channel is not the " subwoofer channel "; there may be no subwoofer and, if there is, it may be handling a good deal more than effects.
These labels sometimes use the LFE channel to carry a height channel, underlining its redundancy for its original purpose.
This notation, e. g. " 5. 1 ", reflects the number of full range channels ; including a ". 1 " to reflect the limited range of the LFE channel.
2 basic stereo speakers with no LFE channel
5 full-range channels + 1 LFE channel =
3 front channels + 2 side channels + an LFE channel = 3 / 2. 1
LFE and is
The LFE is a source of some confusion in surround sound.
They argue that all available channels have a full frequency range and, as such, there is no need for an LFE in surround music production, because all the frequencies are available in all the main channels.
The low-frequency effects ( LFE ) channel is the name of an audio track specifically intended for deep, low-pitched sounds ranging from 3-120 Hz.
The LFE channel is conventionally played back 10 dB louder than the main channels, giving significantly more recording headroom.
Later formats such as Dolby Digital retained the LFE channel, although this is more through convention and backwards compatibility than necessity, as digital formats have greater dynamic range than the magnetic analogue recordings on 70 mm prints, and modern sound processors have a bass management system to redirect bass from all channels to a subwoofer.
The LFE channel content is not the same as the content of a subwoofer-out jack.
As such, it is incorrect to call the LFE the " subwoofer channel ".
Lambda Phi Epsilon ( ΛΦΕ, also known as LPhiE, LFE or LiFE ) is an internationally-recognized fraternity in the United States and Canada.
All bass from the left channels are directed to a left LFE channel while right channel bass is directed to the right LFE channel.
In this case, the Sensurround 3. 1 track is just the mono soundtrack fed to the 3 front speakers and the LFE channel.
The basic and most common version of the format is a 5. 1-channel system, similar to a Dolby Digital setup, which encodes the audio as five primary ( full-range ) channels plus a special LFE ( low-frequency effects ) channel for the subwoofer.
The. 1 LFE subwoofer track is mixed into the discrete surround channels on the disc and recovered via low-pass filters in the theater.
LFE and used
While LFE channels originated in Dolby Stereo 70 mm film prints, they became commonplace in the 1990s and 2000s in home theater systems used to reproduce film soundtracks for DVDs and Blu-rays.
LFE and bass
The LFE channel originated in Dolby Stereo 70 mm Six Track film prints, as a way of providing louder bass and sub-bass effects, without detracting from the quality of the standard audio channels.
The LFE channel delivers bass-only information to supplement the overall bass content.
The bass management system may direct bass to one or more subwoofers ( if present ) from any channel, not simply the content of the LFE channel.
LFE and from
It can also be expressed as the number of full-range channels in front of the listener, separated by a slash from the number of full-range channels beside or behind the listener, separated by a decimal point from the number of limited-range LFE channels.
LFE and up
Other, newer DTS variants are also currently available, including versions that support up to seven primary audio channels plus one LFE channel ( DTS-ES ).
LFE and channels
Some record labels such as Telarc and Chesky have argued that LFE channels are not needed in a modern digital multichannel entertainment system.
3 front channels + 2 rear channels + 3 channels reproduced in the rear in total + 1 LFE channel = 3 / 2: 3. 1
Over seven full-range 24-bit / 96 kHz discrete channels are supported ( plus a LFE channel, making it 7. 1 surround ) along with the HDMI interface.
* Two LFE channels: LFE Left and LFE Right
* Two LFE channels: LFE Left, LFE Right
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