Bedienungsanleitung Cambridge Audio Azur 851C (Seite 12 von 16) (Englisch)

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Operating instructions cont.

Filters

The 851C DSP has three different Filter functions: Linear Phase,

Minimum Phase and Steep. All three lters are highly sophisticated

audiophile topologies, optimised specically for audio playback. In our

opinion, these lters offer excellent sound quality but differ subtly in

optimisation, hence we’ve made all three available to you.

Note: For clarity, all diagrams show the theoretical response of the DSP

itself, excluding any analogue ltering at the DAC output or the anti-

aliasing lter applied during recording and/or mastering of the digital

source.

Linear Phase Filter

-80

-60

-40

-20

-200

-180

-160

-140

-120

-100

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Magnitude (dB)

Frequency response

The Linear Phase lter is a highly regarded audio lter offering low ripple

in both the pass and stop bands, and what is known as constant group

delay. Constant group delay means that audio signals of all frequencies

are always delayed by the same amount when passing through the lter.

All audio is therefore fully time-coherent at the output.

The trade-off with this type of lter is that due to internal feed-forward

in the DSP, its impulse response will exhibit some pre-ringing. In other

words, when excited with a theoretical impulse, the output has both

a small amount of pre- and post-spike amplitude ringing (albeit well

damped).

0 20 40 60 80 100 120 140 160 180

Frequency response

Amplitude

Setup

Menu structure

Auto Off Auto

Play

USB

Class

Input

Naming

S/W

Version

Front IR Digital

Volume

Ch.

Balance

The 851C menu structure has a variety of setup parameters that can

be adjusted to suit both specic installation requirements and personal

preferences. The setup parameters are accessed and modied through

a menu driven interface that uses the 851C display along with its front

panel or handset Menu, Select, Skip ( ) and Stop () buttons.

To enter the 851C setup menu, rst press the front panel or handset

Menu button. The rst setup parameter (Auto Off), will be shown on the

display. To select further parameters for adjustment press the one of the

front panel or handset Skip ( ) buttons.

With the required parameter selected, press the front panel or handset

Select button. Pressing one of the Skip ( ) buttons will now scroll

through the options available for that parameter. When the required

option is displayed, press the front panel or handset Select button.

The setup option is now stored. To exit from the setup menu interface

press the front panel or handset Menu button to step back through the

interface.

Note: The 851C will automatically return to normal play mode if it is left

inactive in setup menu mode for more than a minute.

Each setup parameter and its options is described following paragraphs.

Auto Off – When Auto Off is engaged the 851C will switch to standby

after a preset time if no audio is playing. The Auto Off options are Off, 5

minutes, 10 minutes and 15 minutes.

Auto Play – WIth Auto Play engaged a CD will begin to play as soon as the

disc drawer is closed. The Auto Play options are Off and On.

USB Class – USB Class options enable 851C compatibility with both USB

Audio 1.0 and USB Audio 2.0 interface formats. The default setting is

USB Audio 1.0 which will work driverlessly with most operating systems

for 16-24 bit content at 32-96kHz. Note USB Audio 2.0 requires a driver

to be loaded for Windows. Without this selecting USB Audio 2.0 will

normally give no output . See section on USB Audio for advanced users.

Input Naming – Input Naming enables the display name of the Digital 1,

Digital 2 and AES/EBU inputs to be changed. Use the Skip ( ) and

Select button to select the input name to be changed. Once selected

a ashing cursor will appear beneath the rst character to the existing

name. The Play/Pause and Stop () buttons can then be used to scroll

through the available characters. When each desired character is

displayed, use the Skip ( ) buttons to move on to the next character.

Press the Select button to store the new name.

S/W Version – Selecting S/W Version displays the player’s internal

operating software version number and some additional build

information. This information is primarily provided for service personnel.

Front IR – Selecting Front IR enables the 851C front panel infrared

receiver to be switched on or off (if you are using an external IR system

and the IR emitter Input or Control Bus. In the majority of installations

the infrared receiver should be left switched on.

Digital Vol – Digital Volume enables the 851C to operate as a digital

preamplier and be connected directly to a power amplier. With Digital

Volume engaged, the remote handset volume buttons (symbols) will

control the 851C analogue output level. Digital Volume is disengaged

(Off) by default and should remain off in most 851C installations. It

should only be engaged (On) if the 851C is installed in an appropriately

congured audio system without a further downstream volume control.

Ch. Balance – Only enabled when Digital Volume is used. A balanced

control is implemented.

 



(Note: Only available

if Digital Volume is

enabled)

Off 5m 10m 15m Digital 1 Digital 2 AES/EBU

On Off Off OnOn OffAudio 2 Audio 1

Cambridge Audio Azur 851C Seite 12

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