FrankH

Hi All! Since LabVIEW uses only Windows MME driver for sound in and out, I'm looking for an other way to get sound data into LabVIEW with much less latency. Has someone use ASIO4ALL for audio input? For sound out I use Midi via MME and the Windows own synthesizer. Its latency is really not high. But the input data comes with some hundred milliseconds lateness. With MME: I tested on 2 systems. About 350ms latency and not really depending of the system load. I tried also with small sample packages of 600 and 1200 byte/chn and a sound card acquisition rate of 96kS/s. In order to collect this data amount the time what the PC needs should be theoretical 6,25/12,5ms plus data transfer time and some reaction times of the system modules. But the response time of MME seems in-depending on it. It needs always around 320...380ms. And the processor load was very low. Maybe someone can help me to use a faster software interface (ASIO?). Best greetings, Frank

Hi! I read this thread Very interesting about the based topic to implement a database in a RT-System! My topics at work are automation topics. Also with RT-systems in a stand-alone formation. For example a special interlock system at the ESRF facility in Grenoble (X-rays at a electron accelerator). This system has only a web interface. lt based on sbRlO. And this system needs a process data logging system and a message logging system. For process data l use TDMS with pre processing to reduce data amount (dead band). For messages l use a special file and a translation table, since l need the visualization in German, English and France. The message record needs some columns. Time stamp, massage reference, status and place of origin. This is a typical DB- application. Why I should develop my one message DB ? Either I do it really or Christian_L provide his solution. We will see. Frank