Bedienungsanleitung Yamaha RX-V2500 (Seite 104 von 107) (Englisch)

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GLOSSARY

■ ITU-R

ITU-R is the radio communication sector of the ITU

(International Telecommunication Union). ITU-R

recommends a standard speaker placement which is used

in many critical listening rooms, such as mastering

studios.

■ LFE 0.1 channel

This channel is for the reproduction of low bass signals.

The frequency range for this channel is 20 Hz to 120 Hz.

This channel is counted as 0.1 because it only enforces a

low frequency range compared to the full-range

reproduced by the other 5/6 channels in Dolby Digital or

DTS 5.1/6.1-channel systems.

■ Sampling frequency and number of

quantized bits

When digitizing an analog audio signal, the number of

times the signal is sampled per second is called the

sampling frequency, while the degree of fineness when

converting the sound level into a numeric value is called

the number of quantized bits.

The range of rates that can be played back is determined

based on the sampling rate, while the dynamic range

representing the sound level difference is determined by

the number of quantized bits. In principle, the higher the

sampling frequency, the wider the range of frequencies

that can be played back, and the higher the number of

quantized bits, the more finely the sound level can be

reproduced.

■ THX Cinema processing

THX is an exclusive set of standards and technologies

established by the world-renowned film production

company, Lucasfilm Ltd. THX grew from George Lucas’

personal desire to make your experience of the film

soundtrack, in both movie theatres and in your home

theatre, as faithful as possible to what the director

intended.

Movie soundtracks are mixed in special movie theatres

called dubbing stages and are designed to be played back

in movie theatres with similar equipment and conditions.

This same soundtrack is then transferred directly onto

Laserdisc, VHS tape, DVD, etc., and is not changed for

playback in a small home theatre environment.

THX engineers developed patented technologies to

accurately translate the sound from the movie theatre

environment into the home, correcting the tonal and

spatial errors that occur. On this product, when the THX

indicator is on, THX features are automatically added in

Cinema modes (e.g. THX Cinema, THX Surround EX).

Adaptive decorrelation

In a movie theatre, a large number of surround speakers

help create an enveloping surround sound experience, but

in a home theatre there are usually only two speakers. This

can make the surround speakers sound like headphones

that lack spaciousness and envelopment. The surround

sounds will also collapse into the closest speaker as you

move away from the middle seating position. Adaptive

decorrelation slightly changes one surround channel's time

and phase relationship with respect to the other surround

channel. This expands the listening position and creates –

with only two speakers – the same spacious surround

experience as in a movie theatre.

Re-equalization

The tonal balance of a film soundtrack will be excessively

bright and harsh when played back over audio equipment

in the home because film soundtracks were designed to be

played back in large movie theatres using very different

professional equipment. Re-equalization restores the

correct tonal balance for watching a movie soundtrack in a

small home environment.

Timbre matching

The human ear changes our perception of sound

depending on the direction from which it is coming. In a

movie theatre, there is an array of surround speakers so

that the surround information is all around you. In a home

theatre, you use only two speakers located to the side of

your head. The timbre matching feature filters the

information going to the surround speakers so that they

more closely match the tonal characteristics of the sound

coming from the front speakers. This ensures seamless

panning between the front and surround speakers.

Audio information

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