Cambridge Audio 640H User Manual download pdf (Page 9)

“If we could give products six

stars, then these CD players

would get them”

What Hi-Fi? Sound and Vision, UK

CD Players

azur

840C – flagship upsampling CD player

With the 840C, Cambridge Audio has applied new technology to the concept of

upsampling. A

Hi-Fi Choice

Gold winner, the magazine commented, “There simply isn’t

a CD player at the price that offers anywhere near as much!”

Key to its abilities is the ATF™ (Adaptive Time Filtering) upsampling process –

developed in conjunction with Anagram Technologies of Switzerland. This system

intelligently interpolates 16-bit/44.1kHz CD data to 24-bit/384kHz

data, through the use of a 32-bit Analog Devices ‘Black-Fin’ DSP.

Both balanced XLR and unbalanced RCA outputs are fitted. Two

digital inputs are also provided which even allow the upsampling and

playback of other sources such as a DVD player via the Azur 840C. In addition, a

recording digital output can even allow bit-for-bit data or upsampled data at 48, 96 or

192kHz to be recorded by a suitable device.

A Control Bus In/Out, an IR emitter In connection and an RS232 port are provided for

easy multi-room connectivity.

All this impressive technology and more leads to a CD player of incredible ability,

staggeringly low distortion, very low noise floor and almost total freedom from jitter.

740C – premium CD player

The 740C is the latest in Cambridge Audio’s Azur series of CD players which uses

the same ATF™ upsampling technology present in the top-of-the-range 840C

barnstormer. This is married to dual Wolfson WM8740 24-bit DACs (Digital to

Analogue Converters) in dual differential mode. The 740C incorporates the same

32-bit DSP as the 840C and upsamples to full 24-bit 384kHz. The implementation of

the incredible ATF system almost completely eradicates digital jitter.

As each channel has its own DAC to process information, completely separate and

symmetrical analogue filter circuitry can be implemented. These allow both left and

right channel circuitry to operate identically, ensuring the 740C delivers fantastic

sound-staging and stereo imaging properties.

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Cambridge Audio 640H User Manual Page 9