RASP-LC

RASP-LC manufactured by System in Frontier Inc.has the following features:

• 8 channel audio input
• USB interface
• Can be seen as an ALSA device

 

 RASP-LC Installation Instructions

The device is recognized as an ALSA device.
Therefore you don’t have to install any specific packages for RASP-LC.
For the installation of HARK basic packages, follow …

• HARK Installation Instructions

 

 RASP-LC Tutorials

 

Device setup on Ubuntu

Connect your RASP-LC to your PC.
It is recognized as an ALSA device on Ubuntu.
Check if the device is connected by the following command.

cat /proc/asound/cards

 

Then you will see something like

0 [Intel          ]: HDA-Intel - HDA Intel
                    HDA Intel at 0xf8220000 irq 17
1 [RASPLC         ]: USB-Audio - RASP-LC
                    SiF RASP-LC at usb-0000:00:1d.0-1, full speed
...

If you can see SiF RASP-LC in the list.
Your RASP-LC is correctly mounted.

Notice that the number on the very left hand side is the sound card index.
In this example, the device is mounted as No. 1.

How to use your RASP-LC in HARK

We suppose you’ve read the HARK document in HARK Documentation page, and you have an intermediate level skill of HARK network file construction.

To use your RASP-LC in HARK, put AudioStreamFromMic module on the network and set its parameters as follows:

Name	Type	Value	Explanation
LENGTH	int	512	Number of samples in one frame
ADVANCE	int	160	Shift length
CHANNEL_COUNT	int	8	Number of microphone channels
SAMPLING_RATE	int	16000	Sampling rate of the audio stream
DEVICE_TYPE	string	ALSA	Category of the sensors
DEVICE	string	plughw:*	Device name

The asterisk in the DEVICE parameter means the sound card index.

cat /proc/asound/cards

provides the sound card index on the left hand side.
If you see

0 [Intel          ]: HDA-Intel - HDA Intel
                    HDA Intel at 0xf8220000 irq 17
1 [RASPLC         ]: USB-Audio - RASP-LC
                    SiF RASP-LC at usb-0000:00:1d.0-1, full speed
...

set DEVICE=plughw:1 for using your RASP-LC.