Manual Arcam AV950 (page 20 of 206) (English, German, Dutch, French, Italian, Spanish)

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English

High resolution audio sources

Dolby TrueHD Provides up to 7.1 full channel at 96kHz, 24bit resolution, with potentially no

losses in the compression process. Data rates can be up to 18Mbps.

Dolby Digital Plus Provides up to 7.1 discrete channels of audio with less compression than

traditional Dolby Digital encoding. Data rates can be up to 6Mbps.

DTS-HD Master Audio Provides up to 7.1 full channel at 96kHz, 24bit resolution, with potentially no

losses in the compression process. Data rates can be up to 24.5Mbps.

For Dolby Digital sources

Dolby Digital 5.1 e most commonly used sound format for DVD video, and is also the

standard for US television. Dolby Digital 5.1 sources deliver sound with ve

discrete full-range channels; le, centre, right, surround le, surround right,

plus a low frequency eects (LFE) channel.

Dolby Digital 5.1 Stereo

Downmix

Provides a stereo downmix of the source material for use with headphones.

Dolby Digital EX is is an extension to Dolby Digital decoding that provides a 6-channel output

from a 5-channel input. e extra channel is the centre-surround channel (for

which the two surround back speakers are used), and is derived from the le

and right surround channel information. is decode mode should be used

only when the source material is ‘Surround EX’ encoded (which is normally

indicated on the disc packaging and should be detected automatically by the

AV950/AVR750/450/380), but may be used at other times if desired.

Dolby Digital 5.1 + Pro Logic

IIx Movie

is mode is used to derive information for the individual surround back

channels from the surround channels, using the Pro Logic IIx Movie decoder.

Dolby Digital 5.1 + Pro Logic

IIx Music

is mode is used to derive information for the individual surround back

channels from the surround channels, using the Pro Logic IIx Music decoder.

e controls for adjusting Pro Logic IIx Music in ‘General Setup’ can be used in

this mode.

For DTS sources

DTS 5.1 Less common than the Dolby Digital format, but generally recognised within

the audio industry as being of superior sound quality. DTS 5.1 delivers

surround sound with ve full range channels plus an LFE channel.

DTS 5.1 Stereo Downmix Provides a stereo downmix of the source material for use with headphones.

DTS-ES 6.1 Matrix is is a 6.1 channel format based on DTS 5.1. It has the sixth channel matrix

encoded into the surround le and surround right channels. e sixth channel

is a surround centre channel and is directed to the surround back le and

surround back right speakers.

DTS-ES 6.1 Discrete is is a true discrete 6.1 channel sound format (unlike DTS-ES Matrix).

DTS-ES discrete mode operates only on sources with DTS-ES 6.1 discrete

audio encoding.

DTS96/24 Provides up to 5.1 channels of audio at 96kHz, 24bit resolution for superior

sound quality compared to standard DTS 5.1

Neo:6 music mode expands stereo recordings into

the ve or six-channel layout without diminishing

the subtlety and integrity of the original stereo

recording.

Multi-channel source modes

Digital multi-channel source material is normally

provided as ‘5.1 audio’. e ‘5.1 channels’ comprise

of: le, centre and right front speakers, two surround

speakers and a low frequency eects (LFE) channel.

Since the LFE channel is not a full range channel, it is

referred to as ‘.1’.

Surround systems decode and reproduce the 5.1

channels directly. Dolby Digital EX and DTS-ES matrix

enhanced decoding systems create one extra rear

channel from information buried in the two surround

signals of the 5.1 source. ese EX and ES enhanced

systems are sometimes referred to as ‘6.1’ systems. is

extra surround back channel is normally reproduced

through two separate loudspeakers, creating a ‘7.1’

system.

DTS-ES discrete is a true ‘6.1’ source, with six discretely

encoded channels, plus the ‘.1’ LFE channel.

Dolby Digital Plus, Dolby TrueHD and DTS-HD are

high-resolution surround formats found on Blu-Ray

discs

Decoding modes

e modes given in the following table are available for

multi-channel digital sources.

Special modes such as DTS-ES 6.1 discrete, Dolby

Digital Plus, Dolby TrueHD and DTS-HD are only

available from the correct source material.

Dolby volume

Dolby Volume is a sophisticated

new technology that resolves the

problem of dierent volume levels

between programme content (e.g. a TV show and advert

breaks) and between sources (e.g. a rock radio station

and DVD, or between two TV stations). It lets the

listener enjoy everything at the same preferred listening

level without having to reach for the volume control to

compensate for the dierent recording/output levels.

is is the Volume Leveller function of Dolby Volume.

Dolby Volume also works in conjunction with the

AV950/AVR750/450/380 volume control setting to

compensate for the ear’s changing sensitivity at dierent

frequencies depending on how loud the audio is. It

is based on a model of how human hearing works. It

properly balances low, mid and high frequencies to

maintain all the nuances and impact of the original

audio regardless of the actual selected playback volume

level. is is the Volume Modeller function of Dolby

Volume.

Dolby Volume measures, analyses and maintains volume

levels based on how people perceive sound. A variety of

audio parameters are monitored including spectral- and

time-based loudness to ensure that perceived dynamics,

timbre and bass performance remain consistent at all

volume levels.

Dolby Volume also lets the listener control a

programme’s dynamic range – the range between loud

and quiet sounds. For example, with the volume turned

down for late-night viewing, dynamic range can be

adjusted so that speech remains clear and loud eects or

music passages retain their impact without waking up

the family.

Settings

Dolby Volume can be applied to any analogue or digital

stereo source or any digital multi-channel source. It is

not available in Stereo Direct or on the analogue multi-

channel input. Dolby Volume can even be applied to

processing of stereo signals (e.g. PLII Music) or when

down-mixing a digital multi-channel source (e.g. Dolby

Digital 5.1 down to stereo).

Dolby Volume can be enabled and congured separately

for each audio input in the Input Cong menu. e

default is ‘O’ for ‘audiophile’ listening. You may wish

to turn Dolby Volume ‘On’ for TV and movie sources

to maintain the same perceived overall listening level

between sources and frequency response regardless of

the volume setting. Most of the controlling parameters

of Dolby Volume are automatic as they are dependent

on analysis of the audio signal and the volume setting

of the AV950/AVR750/450/380. However, the Volume

Leveller and Calibration Oset controls (see below) can

be adjusted to your preference.

Volume Leveller

e Volume Leveller function of Dolby Volume controls

how closely quiet and loud sources and programme

content are matched to each other, based on the

ear’s perception of loudness. e range of values is 0

(minimal levelling) to 10 (maximum levelling). e

default setting is 2. If the Volume Leveller function

is turned o, no level matching between sources and

programme material is performed. is is not the

same as turning Dolby Volume o as volume related

frequency response processing is still active.

When Dolby Volume is being applied to the current

input, a Dolby Volume processing mode indicator is

shown on the OSD and the front panel display.

Calibration Oﬀset

e Calibration Oset parameter of Dolby Volume

allowsyoutocompensateforspeakerecienciesand

listening position – eectively moving the reference

listening level up or down the volume scale. e default

value is 0 and this should normally produce a good

result when the AV950/AVR750/450/380 speaker levels

are set using a sound pressure level meter at the listening

position (75dB SPL, ‘C’ weighting, slow response).

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Arcam AV950 Manual

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