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© Ideon Audio, April 2018 – absolute manual r. 1.2
Due to continuous research, Ideon Audio reserves the right to change specifications without notice.
Connecting us with the musical event
IIR: infinite impulse—response filter, a fundamental element of digital signal processing.
The IIR achieves the given filter characteristic using only a small amount of memory and
processing power
Lock speed: this function sets number of audio samples required of the incoming signal
before the DPLL* and jitter eliminator lock onto it. More audio samples give a better first
estimate of the master clock—full-scale range ratio; on the other hand, the more the audio
samples, the longer the locking time interval.
Default value is 16384 FSL edges. Choices: 1024, 2048, 4092, 8192, 16384.
* DPLL Digital phase-locked loop. Changing the DPLL values can affect jitter and noise.
Dithering: is a technique used to improve the sound of digital audio. It helps reduce the
difference between the original signal and its reconstructed digital counterpart (called
“quantization error”).It affects both the spectral response and the SNR of the digitized signal
and enhances the signal’s dynamic range.
Jitter eliminator: reduces input clock jitter (ESS patented function). Enabling this function
improves audio signal clarity.
De-emphasis: a filter that undoes pre-emphasis which is a first order high-pass filter—i.e. a
filter that emphasizes high frequencies. De-emphasis attempts to bring back a flat response.
Volume: range -127dB- 0dB (full volume). Default setting is -0dB FS (i.e. full volume).
Oversampling filter: enabled gives access to 7 user-selectable, pre-set filters. The filters
influence the frequency response and allow the user to tailor the sound to personal taste, the
recording, or the mastering.
• Fast roll-off, minimum phase
• Slow roll-off minimum phase
• Fast roll-off linear phase
• Slow roll-off linear phase
• Brick wall
• Hybrid, fast roll-off minimum phase
• Apodizing, fast roll-off minimum phase
Description of user controllable parameters and functionalities
We recommend the usage of the default values at least until the absolute has reached
optimum performance levels (i.e. over 300 hours of signal processing).
Please note that the Absolute defaults to full, fixed output level (-0 dB FS) when switched
on. This position offers the best sound.