Use case: Acquiring data from multiple devices
20 Mar 2014

NOTOCORD-hem™ Evolution contains numerous acquisition servers that feed the data coming from specific acquisition hardware to the kernel for recording and processing (see Overview & Key Concepts).
The kernel is able to get data from different acquisition devices at the same time. This allows the usage of different configurations discussed below.

Shared configuration

The shared configuration is shown in Figure 1. Two different signal generators from acquisition servers are placed in the configuration of a Hem instance. Each signal generator connects to the correspondent NOTOCORD-hem™ acquisition server. Each servers gathers data from the dedicated acquisition hardware.  The servers are started and stopped at the same time and all the data are recorded in a single file.

Fig. 1 NOTOCORD-hem™ acquires data simultaneously from two acquisition devices

The most common example of a configuration illustrating acquisition from multiple devices is telemetry and video.  The first acquisition server records data coming from a telemetry device (e.g. DSI70a) and at the same time the second acquisition server acquires video data (VSH10a). 

Shared servers

Some servers like DSI70a and VSH10a allow sharing the channels between different recording instances (fig.2). Each server records a number of specific parameters from all the sources and each instance creates a record for a single source. The instances start and stop the acquisition of data independently, in distinct files.  

Fig.2 NOTOCORD-hem™ acquires each source in a distinct instance

Shared platform

Different servers can be used in correlation or independently on the same platform. Figure 3 shows an example of such a configuration that was used to test the prototype of STE10a server. Two instances of NOTOCORD-hem™ share the same platform, acquire data independently and create distinct files.
 

Fig. 3 Stellar and Data Translation servers are used on the same platform

One instance of Hem uses STE10a module to get data from the Stellar telemetry system. A second instance of Hem uses LAS30a module to connect to DT9804 board and it acquires an additional parameter needed for the test (the implant supply current).

Using the configurations discussed above is an easy way of associating different acquisition systems in NOTOCORD-hem™, adding to a study variables that may be of interest or creating a multipurpose platform for studies based on different acquisition devices.