8.1.2 RASP-24

Figure 8.3 shows the picture of RASP-24. Similarly to Wireless RASP, RASP-24 is a A/D converter that records 8 or 16 channel microphones simultaneously in various sampling rates. In addition, RASP-24 supports 2ch D/A converting (playing a wave file). Since the D/A can be synchronized with A/D converting, you can simultaneously play a wave file and record them. The difference from Wireless RASP is that RASP-24 can record sound at 24 bit (Wireless RASP records at 16 bit). Since RASP-24 has larger quantization bits, it can record with less quantization error.

You can connect your computer to RASP-24 via TCP/IP. RASP-24 supports wired and wireless recording: if you use a LAN port embedded on RASP-24, you can record via wired network. if you add a wireless LAN device on the USB port embedded on RASP-24, you can record via wireless network. See the product manual for details.

Basically, the usage is the same as Wireless RASP: (1) network configuration, and (2) recording using AudioStreamFromMic . The difference from Wireless RASP is that RASP-24 do not require firmware initialization after power on. Therefore, you do not need to run ws_fpaa_config at the beginning. See the chapter of samples in HARK Cookbook for sample network files.

Figure 8.3: RASP-24