Meridian G91 Manuel d'utilisateur télécharger pdf (Page 3)

If conﬁgured for MHR SmartLink they, or the ad-

jacent combined 15-way D-type connector, carry

high-sample rate encrypted data from DVD discs

for the highest ﬁdelity of decoding and repro-

duction. The SmartLink also informs a connected

Meridian processor of the signal source, so that

it can switch processing modes automatically.

An additional S/PDIF digital output delivers a

stereo downmix or bitstream signal.

The G91A includes a preampliﬁer and integral

radio tuner. The main stereo analogue pre-

amp output is either ﬁxed, or variable via the

front-panel knob which controls the Meridian

proprietary digital/analogue volume control – a

design similar to that used in the 800 Series and

DSP 8000.

Two tuner options are available: AM/FM and

DAB/FM. The former provides AM (LF/MF)

and FM (VHF stereo Band II) reception with

RDS/RDBS, and is ﬁtted with its own 96kHz,

24-bit A/D stage. Digital signal processing

provides a sophisticated FM stereo blend/width

control which allows you to minimise noise

on a received signal. There is also a DSP-based

low-pass ﬁlter and a whistle ﬁlter for improved

AM reception. Alternatively, a version is available

with DAB Digital Radio (VHF Band III and UHF

L-Band) and FM. This option is described in a

separate sheet.

The G91A includes upsampling in stereo, which

allows digital ﬁlters to be placed far beyond the

range of human hearing, as well as offering

other audible beneﬁts right across the audio

band, including improved transient response. All

processing is at 48-bit precision. This results in a

more open, transparent sound, tighter bass, and

a generally more ‘musical’ sound overall.

To drive the multichannel analogue outputs, sig-

nals are upsampled to 176.4/192kHz for digital

to analogue conversion – DACs can offer better

performance at higher sampling rates – and

88.2/96kHz is used for the digital outputs, all at

24-bit word lengths.

Here again, sending 24 bits at high sample rates

via an S/PDIF link reduces jitter as compared

with the original 44.1kHz, 16-bit signal from a

CD, for example. In addition, high-resolution

digital outputs are encrypted, removing cyclic

components from the data stream and further

reducing jitter.

All these advanced digital processing features

are handled by a powerful DSP engine delivering

an impressive 150MIPS (million instructions per

second).

In addition, the G91A incorporates digital sur-

round decoding to allow the multichannel ana-

logue and digital outputs to be used to drive a

5.1 surround system directly, based on Meridian

DSP Loudspeakers and/or conventional analogue

amps and speakers.

The built-in surround processing system decodes

5.1 MLP, Dolby Digital or DTS soundtracks from

DVD-A or DVD-V discs, and Dolby Digital or DTS

data streams fed into the external digital inputs.

It will also synthesise a full surround image from

2-channel soundtracks on audio CDs, DVD-A or

DVD-V discs, or from the external two-channel

digital or analogue inputs, by extracting latent

surround information in the recording.

Several DSP presets are provided to allow you to

choose the type of surround processing used for

different sources. For 5.1 audio formats a Dis-

crete or Cinema DSP preset is selected automati-

cally, depending on whether the source is music

or a movie. For two-channel audio formats the

DSP preset can usually be switched between Tri-

ﬁeld (recommended for music), Stereo (uses just

the main left and right speakers and subwoof-

er), or PLII (recommended for movies), using the

DSP key on the front panel or MSR+.

On the video side, advanced video circuit

designs, matched phase video ﬁlters, and a

broadcast-quality video encoder are employed

to deliver low-noise images of outstanding

colour depth and resolution. Separate ultra-

low jitter master video and audio oscillators

allow picture and sound to be independently

optimized, ensuring that the G91A DVD player

delivers breathtakingly clear pictures.

G91A DVD Audio/Video Player Controller Tuner

The G91A forms the perfect heart of an ana-

logue or digital surround system, and the latter

is shown here. In fact, the G91A will drive any

combination of analogue and digital speakers in

a surround system (though it is advisable to use

identical speakers for left and right of each pair.

The analogue outputs are driven by 24-bit DACs

that are upsampled to 176.4 or 192 kHz for

maximum ﬁdelity, and the digital outputs offer

up to 24-bit, 96 kHz sampling – the highest

quality available today from multichannel digital

source material. The output level is controlled

by the front panel knob or via remote.

The G91A supports almost any kind of video

display device, whether composite, S-Video,

Component (progressive or interlaced) or even

the latest interfaces such as HDMI or DVI. Dif-

ferent video inputs are converted to all formats,

so there is only need for one display connection.

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Meridian G91 Manuel d'utilisateur Page 3

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