Purpose:

The device is designed to prevent high-quality recording on the voice recorder by the negotiators from listening from the side with the help of listening devices using a microphone. Ultrasonic cancellation is effective against broadband high quality microphones. Acoustics perfectly complements ultrasound, suppressing microphones with limited bandwidth.

Execution:

The device is made in an aluminum case (Fig. 1). Convenient to use. Controlled from the front panel or from the remote control supplied. The device is powered and charged by the supplied power supply (19V)

 Preparation for work:

To achieve the maximum effect of acoustic suppression, it is necessary to record the voice of the owner of the device into the device. To do this, hold the black button next to the microphone for a few seconds until the blue LED starts flashing. Next, dictate any text at a distance of 30cm to 50cm to the microphone. Recording duration from 30 seconds to 5 minutes. At the end of the recording, press the black button again.

If the recording is shorter than 10 sec. then the unit will return to the preset recording.

 When controlled from the remote control:

A – turn on, ultrasonic suppression.

B – turn off

C – turn on, ultrasonic + acoustic suppression in quiet mode.

D – turn on, ultrasonic + acoustic suppression in loud mode.

 Working with the device:

The USPD-C2 device is located as close as possible to the negotiating place. . The device is turned on as needed either from the front panel or from the remote control. The volume is selected in advance depending on the distance of the device from the interlocutors, the volume level should not interfere with the conversation.

• Ultrasonic signal power……………….112db
• Remote control control range………….up to 10m.
• Power………………………………….12-19V, 3.5A