EM Digital Voice Recorders LCD is a new series of digital voice recorders (DVR).Voice recorders of the EM Digital Voice Recorders LCD series are professional devices intended for making high quality record of voice messages into the built-in flash memory. You can playback recorded messages using the earphone and save them into your PC as standard sound files.

Voice recorders are of extremely small size and weight, have a long record duration (varies with the model - up to 600 hours) and autonomy operation (up to 1000 hours), a wide dynamic range and a highly sensitive built-in microphone. Having no moving parts, the DVR is able to function within a wide range of temperatures, under strong vibration and dustiness.

For the user's convenience while operating the DVR, there is a push-button manipulator (joystick) and a liquid-crystal display to indicate all the information needed, including a built-in clock / a real-time timer.

Having small size traditionally, the model features the following:

• three-line LCD indicator;
• joystick to control the DVR;
• dynamic range, extended by 8 times (16 bit codec, and 18 bit when using an external microphone);
• signal/noise ratio improved by 12 dB;
• extended recording frequency band (100-6000 Hz), sample rate selection 4/8/16 kHz;
• lower current consumption: half in Recording mode, 5 times lower in Standby mode and 20 times lower in VAS;
• faster data exchange with the PC through the supplied USB adapter;
• timer for automatic scheduled recording;
• antialiasing program median filter available to improve recorded and played signal quality;
• firmware upgraded by the user;
• new, more functional software for PC.

DVR operation features:

• The DVR records either in the sequential messages mode (one by one, the number of messages is limited only by the DVR memory) or in the cycle buffer mode (i.e. cyclically). The DVR can provide some memory size to the cycle buffer. As soon as the provided memory space comes to the end, the DVR will start recording into the record beginning (i.e. deleting the previously recorded data). Therefore, the cycle mode is convenient if you want to have fresh information for a certain period.
• The DVR has a Voice Activating System (VAS) which effectively compresses pauses in messages, therefore increasing the actual record duration. Activating VAS allows the user to save memory in pauses; but the data about time intervals is stored (and can be restored at further file processing with the software supplied). You may use your DVR for message recording, as well as a flash-disc at the same time, to store and transfer data of any format.

B8 model of DVR uses accessories of type 3.

EM Digital Voice Recorders LCD DVR has several rates of voice compression which enables the user to make
records of different quality and to compromise the record quality and duration.

The DVR provides for eight user settings for record parameters (profiles).

Software :
The supplied USB adapter provides high-speed data exchange between the DVR and PC (1.5 Mb). The software supplied on the CD makes it possible to save the recorded messages as standard sound files, to set the DVR parameters and to control admission to the DVR functions. Besides, with the software you may set admission levels to the DVR functions from joystick. The admission levels prevent data (or DVR settings) damage by unauthorized people. The software features a user-friendly interface; no special skills are required to connect the DVR.

Glossary

• Antialiasing filter
  A low-frequency filter, which is connected before the analog input of the analog-to-digital converter. It is necessary to prevent possible distortions related to spectrum aliasing during the AD converting.
• Dynamic range
  The difference between levels of the loudest and quietest sounds, evaluated in decibels.
• Signal/noise ratio
  Determines the signal intensity relative to the background noise of data transfer channel, evaluated in decibels
• Sample rate
  The rate of sampling at converting the analog signal into digital. It is evaluated in the number of samples per second or in hertz. For example, the sample rate of the CD system is 44.1kHz. The lower the sample rate value, the poorer the quality of the digital record, but smaller the record file size.

Software features and settings :

• VAS presence with tuning parameters
• Antialiasing median program filter
• Linear and circular recording mode
• 8 user profiles
• Random record erasing
• Built-in real time clock
• Timer for scheduled recording
• Battery charge indication

Available Models:

• EM Digital Voice Recorder LCD B8-19h
• EM Digital Voice Recorder LCD B8-37h (2240)
• EM Digital Voice Recorder LCD B8-75h (4480)
• EM Digital Voice Recorder LCD B8-150h (8960)
• EM Digital Voice Recorder LCD B8-300h (17920)
• EM Digital Voice Recorder LCD B8-600h (35840)
• EM Digital Voice Recorder LCD B8-1200h (71680)
• EM Digital Voice Recorder LCD B8-2400h (143360)