Avisoft UltraSoundGate 416-200 User Manual

Introduction
Thank you for purchasing UltraSoundGate 416. This device allows
high-speed data acquisition at sampling rates of up to 750 kHz. In
conjunction with the accompanying software Avisoft-RECORDER
USG, sound-activated direct-to-disk recording and real-time
spectrogram display is supported. The integrated high-quality
analog-to-digital converter with adaptive anti-aliasing filter provides
best performance. The trigger button supports remote-controlled
harddisk recording. The rugged and compact design and the USB
interface make this device the optimal choice for portable
ultrasound recording in the field.

Installation procedure

Hardware Installation

Simply connect the UltraSoundGate to an USB port. An USB Audio
Device and a HID device will be detected automatically. On the
device, the green POWER LED should light and the amber LED
labeled REC should flash once it is connected to the PC. There is
no further user-interaction required. Only in Windows 98, the Add
New Hardware Wizard dialog box will appear and you should
follow the the instructions. To check, whether the device has
successfully been installed you may go to "Start->Settings->Control
Panel->System->Device Manager". Check the "USB Audio Device"
under "Sound, video and game controllers" and the "Input devices
(Human Interface Device)". There should appear an "USB-HID
(Human Interface Device)" representing the trigger button.

Software installation

If you have also purchased the recording software "Avisoft-
RECORDER USG", that is required to use the trigger button, you
will need to install the Avisoft software from the accompanying CD-
ROM. In Windows 2000 and XP you have to log on as
Administrator. The installation program setup.exe (which usually
starts automatically) will install both the Avisoft-RECORDER and
the SASLab Pro software.

Getting started

The UltraSoundGate device appears to the PC as a standard audio
recording interface. Therefore, any sound recording application can
be used to operate this device. However, please note, that only
certain sampling frequencies are supported (see table
).
resolutions & oversampling
The recording software Avisoft-RECORDER USG is specifically
adopted to this device and will support all UltraSoundGate features.
After installation, this software can be launched from Start /
Programs / Avisoft / RECORDER USG (rec_usg.exe).
First go to Options / Configuration and select the desired
sampling rate from Input-Device Settings / Sampling rate. Click
Ok. Then click at the Pause button (Monitoring/Pause) and the
Start button (Monitoring/Start). You will then see the real-time
spectrogram displaying data acquired by the UltraSoundGate. For
details on the operation of the RECORDER software see the
Avisoft-Recorder manual and the section Software Settings in
this guide.

Components of the UltraSoundGate 416-200

4
8

1 XLR input connectors

The 5-pole XLR input connectors represent the analog inputs of the
recording device and provide power supply voltages for external
amplifiers and microphones. The connector scheme is as follows:
1 Ground
2 Positive input
3 Negative input
4 +5V supply voltage (max current 20 mA)
5 +200V polarization voltage (only model 416-200)
Sampling rates,
5
4
3
2
1
differential source
2 TRG REMOTE
This 2-pole (mono) 2.5 mm mini-jack connector is electrically
connected to the TRIGGER button (5) and allows connecting an
external trigger. This input is TTL-compatible (there is an internal pull-
up resistor of 10 kOhm to +5V). Pulling this input to ground (e.g. by
closing a switch) will activate the internal virtual joystick button.
1
+200V +200V
+5V 5 +5V
4
- -
3
+ +
2
1
single-ended source
3 DIGITAL INs
These 2-pole 2.5mm mini-jack connectors allow to connect external
digital signals. These inputs are TTL-compatible (internal pull-up
resistor of 10 kOhm to +5V). The status of the digital inputs is
stored in the LSB (bit 0) of the 16-bit data words that are transmitted
over the USB and can be extracted afterwards by the Avisoft-
SASLab Pro sound analysis software (e.g. for creating labels). The
digital input is not available in the 8-bit recording mode. Once a plug
is connected to this digital input, the available resolution is reduced
to 15 bits (the LSB is discarded).

4 Overload indicators

5
These red LEDs indicate clipping (over-modulation).
6

5 TRIGGER button

7
The silver-colored trigger button is represented to the operating
system as a standard joystick button that can be used to start and
stop hard-disk recording in conjunction with the Avisoft-RECORDER
software. To enable this mode of operation, the trigger type
Joystick button1 / USG Button must be selected from the
Configuration dialog (menu Options/Configuration). If the
TRIGGER button is pressed for more than two seconds, the virtual
joystick button1 will be activated permanently. This is indicated by
3
the flashing REC indicator (6). The virtual button1 can then be reset
(stop recording) by pressing the TRIGGER button again (the amber
LED will be switched off). This feature may be useful for recording
2
longer sequences. If this auto-hold behavior is not desired, one of
the other virtual joystick buttons may be used instead:
button1: represents the state of the button for the first 2 seconds, then auto-hold mode
button2: represents the state of the TRIGGER button (no auto-hold)
button3: represents the inverse state of the TRIGGER button (no auto-hold)
button4 : changes its state each time the TRIGGER button is pressed (toggle mode)

6 REC indicator

This amber LED will flash once the device is connected to the PC. It
will be switched off permanently when a sound recording application
is streaming audio data It will light again permanently as long as
.
the TRIGGER button is being pressed (representing the state of the
joystick button). If the TRIGGER button is pressed for more than 2
seconds, it will start to flash.

7 POWER indicator

This green LED will light as long as the device is connected to the
USB. In case the computer or HUB is unable to provide the required
supply current (because there are other devices connected or the
batteries of the laptop are empty), this LED will be switched off.

8 Recording level controls

These control knobs adjust the analog input recording levels for
each channel.

9 USB connector cable

Connect the UltraSoundGate 416 to a USB 1.1 or USB 2.0 port of a
computer.