HH
1003 VoIP Speaker Phone
VSMPG
4. USING THE VOIP SPEAKER PHONE
4.2
Using as VoIP Speaker Phone
The main usage of the VoIP Speaker Phone is, as the name says, to act as a VoIP phone.
It can, however, be used as a generic sound card, too. Frequency response for the board
when used with earphones is up to 14.5 kHz with good audio fidelity.
4.2.1
Setup
1. Connect the USB cable. If the unit doesn’t power up automatically, push the
“Power” button.
2. The unit will turn into a USB audio device, called “VLSI ADC”. If you
are using Microsoft Windows, you should see a message telling you that new USB
Audio and USB Human Interface Devices have been inserted. You might also hear
a startup sound.
3. To select audio device:
(a) Microsoft Windows: Open “Control Panel”, and select “Sounds and Audio
Devices”. Select the “Voice” tab. There you should see two selections, “Voice
playback default device” and “Voice recording default device”. Select “VLSI
ADC” as the device for both options.
Alternatively, if you don’t want the VoIP Speaker Phone to take over all
audio, start up Skype and open “Tools / Options” menu. There select “Audio
Settings” and set Mic, Speaker and Ring Tone to VLSI ADC.
(b) Mac: You can set “VLSI ADC” as the default audio device using
the control panel.
Alternatively, if you don’t want the VoIP Speaker Phone to take over all audio,
start up Skype and open “Preferences” menu. There select “Audio” and set
Mic, Speaker and Ring Tone to VLSI ADC.
(c) Linux: Select “VLSI ADC” as your input and output device in
your system sound setup menu. In older Linuxes the device can show up
as /dev/audio1 or similar. In such a case select this device in your Skype
preferences menu.
4. To check whether you have an audio connection to the board, start any sound
playing application, like Windows Media Player or Audacity, and play any audio
file that the media player is capable of playing. If you can hear sound from the
speaker (or earphones, if you have earphones connected), everything has gone well.
If sound is distorted or doesn’t play, there is a problem.
5. When you have sound, check to see that there isn’t distortion on the speaker. If
the speaker clips, echo cancellation will not be as effective as it would otherwise be.
So place the speaker in a way that it is not resonating with furniture or the board,
and lower system volume if needed.
6. You are now ready to make a test call. With Skype, the best address for your test
call is Skype’s own test service echo123.
Rev. 2.20
2009-12-07
Page
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