Audiophile Inventory has a perfect sound as the first priority of work.
Our own audio technologies are specially optimized for a better listening experience. What is it? Keep reading.
Human ear has audio range of perceptions from 20 to 20 KHz. Many people have upper-frequency boundaries below 20 kHz.
We often witness the debate: do we hear above 20 kHz in HD record or not? But testing our hearing with a sine oscillator shows real value of the highest listening frequency.
Audio equipment brings non-linear distortions for playing sound. Some ultrasound components in a recording produce audible products in low frequencies at an audio output of a device.
We listen to it as a whistle and/or noise.
AuI ConverteR 48x44 can suppress the whistle and noise.
Frequency filtration of audio signal uses in sample rate conversion algorithm. In digital audio two filter types are used:
Linear phase filter generates unwanted oscillations (ringing) at output (output file of sample rate converter) before passing of input signal to output.
In other words, we listen to the oscillations (burned by the input signal) before we begin listen to this signal at output.
Linear phase filter has equal passing time delays for different frequencies. It is suitable for listening to drums, guitars, and other instruments.
Minimum phase filter doesn't generate unwanted pre-oscillations. But minimum phase filter has non-linear phase response.
No Pre-Ringing (minimum phase filter) vs. Traditional Pre-Ringing (linear phase) filter
Click picture for enlarge
For minimum phase filter Audiophile Invetory picks phase responces by criterion of listening quality (minimization of audible distortions).
According to some experts minimum phase filter has more natural sound than linear phase filter.
However, in 2021, filters of five generations was designed to reduce pre-/post-ringing time.
Below described features of digital signal processing technologies
used into audio converter AuI ConverteR 48x44.
Sampling rate and bit-depth conversion technology.
Advanced dithering technology based for suppressing non-linear distortions of quantisation errors (signal level errors) due bit-depth conversion.
1-bit sigma delta modiulation to create .dsf and .dff (DSD files).
True Gapless Conversion (seamless album conversion).
safeR is safe CD ripping technology by Audiophile Inventory.