840C Upsampling compact disc player
Digital out word width
The digital output word width can be set to 16, 20 or 24 bit (note this is different to the main audio output word width which is fixed at 24 bit for best sound quality):
Press Select to switch between the word width options.
Digital out dither
Dithering is a process where pseudo random noise is added to a signal to remove quantization effects that cause harmonic distortion and replace them with a slightly increased noise floor. The process can improve the perceived quality of digitised audio signals as a small decrease in signal to noise ration (especially where the noise is random) is much preferably to harmonic distortion to the human ear.
The 840C is able to add what is called Triangular Probability Density Function dither to the upsampled Digital Output signals. Normally, dither will have already been added to any CD or source material during its mastering process so the default for this option is off. However if a source with no dither is used (perhaps an off board A/D converter etc) TPDF dither can be turned on:
Press Select to switch between Dither On and Dither Off.
Changing input names / source naming
The 2 digital inputs can be renamed to reflect the actual source units you have connected to the 840C. Press the Menu button to scroll to either the Digital Input 1 or Digital Input 2 naming menus:
Press Select to start changing the name of the input. The first editable character will begin to flash. Use the Stop button to go up through the alphabet/available characters, and Play/Pause to scroll down. To accept your character selection, move to the next character by using the Skip/Scan buttons:
To save and exit, press Select. To cancel and exit, press Menu.
Software version
Displays the currently loaded software version:
Azur upsampling compact disc player 17
