Bulk Pet, short for Bulk Pure Enhanced Technology, is the solution that altering the sound quality arising from INTERFACE CO.,LTD.’s original USB transferring technology.
-Bulk Pure Enhanced Technology-
In the case of audio playback via USB, Isochronous Transfer is generally adopted.
Audio data is transmitted in a constant period in Isochronous Transfer. On the other hand, processing loading also appears in a constant period.
In Bulk Transfer, transmitting large data and retransmitting when errors occurred is available although it’s difficult to control the timing of data transmission.
We have helped development of USB audio interface using Bulk Transfer to shorten the audio latency.
Then we thought up that using Bulk Transfer to change processing loading for the purpose of improving sound quality.
Some audio equipment manufacturers adopting our product ITF-USB DSD helped us to make adjustments the sounds of Bulk Pet.
In the autumn of 2016, we finally released Bulk Pet.
It is defined to using Isochronous Transfer to transmit the audio data in USB Audio Class.
Audio data is transmitted in a constant period in Isochronous Transfer.
On the other hand, huge proccessing loading also appears in a constant period on host CPU and device CPU.
This huge processing loading causes the sound quality slight changes.
Bulk Pet is the technology that transmitting the audio data in Bulk Transfer.
In Bulk Transfer, it’s able to control the transmission data volume and transmission frequency.
Bulk Pet makes the processing loading of both host CPU and device CPU steady as a result of the transmission data volume’s dispersion reduced.
There are 4 Bulk Pet Modes depending on the balance of the processing loading of host CPU and device CPU.
Users can choose anyone they like.
We introduced 2 types of Host CPU’s processing loading(high or low) and also 2 types of how to transmit the data(Pattern A or Pattern B).
In this way, Bulk Pet has 4 combinations of the sound as follows.
|Mode||Host CPU’s processing loading||How to transmit the data|
|Mode 1||Low||Pattern A|
|Mode 2||Low||Pattern B|
|Mode 3||High||Pattern A|
|Mode 4||High||Pattern B|
USB DAC with Bulk Pet can deal with not only Bulk Pet mode but also existing USB Audio Class 2.0.
Therefore, even Host PC which doesn’t correspond Bulk Pet can connect with USB DAC with Bulk Pet by UAC 2.0.
Users can playback music with Bulk Pet in popular APIs such as ASIO, WASAPI and CoreAudio. Also, they can use any music player application with Bulk Pet.
The layer of driver softuware in each OS is below.