Wadia Digital DECODING COMPUTER

Wadia 9 DECODING COMPUTER

INPUT: The Wadia 9 Decoding Computer has 3 Glass Optical digital inputs. The input that is

selected through the remote control will be indicated in the information window. Again, if no

source is connected to the input, then NO DATA will also appear. If a digital source is

connected to the input selected, the information window will indicate the sampling rate of the

source.

SAMPLING RATE: 32

kHz,

and 48

kHz.

These three designations correspond to

the sampling rates of the three consumer digital audio formats. When a digital source that is

connected to one of the inputs of the Wadia 9 Decoding Computer is received and

recognized by the Wadia 9, and the sampling rate is locked onto by the Wadia 9, the

appropriate sampling rate will illuminate.

Digital radio broadcasts are typically in the 32

kHz

format, Compact Disc is in the 44.1

kHz

format (indicated on the display as 44

kHz

due to space limitations), and DAT is in the 48

kHz

format. Recently introduced consumer digital recording formats are likely to be in the 32

kHz

format, although some may be at the higher sampling rates. The Wadia 17 Analog to

Digital converter, for example, can operate at the 48

kHz

sampling rate. As a result, its

output, when connected to the Wadia 9 Decoding Computer would illuminate the 48

kHz

sampling rate display.

The second screen

indicates

whether the signal has been inverted (INVERT), whether the

source has been emphasized (EMPHASIS), and the Signal Quality of the digital signal

entering the Wadia 9 from a digital source (INPUT SIGNAL LEVEL

for example). The

second screen also indicates when the Time Base Correction circuit has been employed.

INVERT: Indicates digital inversion (plus becomes minus, and minus becomes plus) has

been accessed through the remote control. As there are no standards for correct polarity,

some discs (and even certain songs within a disc) will sound better (tighter bass, more

distinct image) when the signal is digitally inverted.

EMPHASIS: Some discs have been encoded with an equalization process called emphasis.

While giving “better” measurements, these discs always sound worse than they would had

this process not been utilized. All compact disc players recognize discs that have been

encoded in this way and then “de-emphasize” the digital signal prior to the digital to analog

conversion. The Wadia 9 notifies the user that a disc has been encoded in this way through

the illumination of EMPHASIS.