The SOROKA-06 voice recorder is designed to record audio signals from internal/external digital MEMS microphones in mono/stereo mode to a micro SD or micro SDHC Class4 or higher memory card. Main technical specifications:
File system type - FAT32.
Recorded file format - WAV.
Maximum file size - 1.8 GB.
Accuracy of the built-in clock is not worse than ±5 minutes per month.
The range of permissible voltages when using an external power cable is from 5 to 28 V.
The range of permissible operating voltages of the voice recorder is from 3.3 to 5.5 V.
The number of adjustable alarms is from 1 to 10 (set by the user) + a cyclic alarm.
Acoustic start mode (with automatic addition of marks).
The ability to encrypt recorded files.
Built-in event recorder.
The overall dimensions of the voice recorder are 45x24x8.5 mm.
The overall dimensions of the battery: 1A/h - 35x51x5.5 mm; 1.8A/h - 35x51x10 mm.
Audio path parameters:
The range of operating frequencies at the level of minus 3 dB:
(100 - 7000) Hz at an audio sampling frequency of 16 kHz; (50 - 3500) Hz at a sampling frequency of 8 kHz;
ADC scale resolution 16 bits;
Manual gain control range from minus 12 to +18 dB in 6 dB increments;
Automatic gain control range from minus 12 to +18 dB in 6 dB increments;
The sound threshold for turning on the recorder in the acoustic start mode is set using manual gain control;
The nonlinear distortion coefficient is no more than 1% at a frequency of 1 kHz (measurements by the acoustic input);
Signal-to-noise ratio 64 dB;
Suppression outside the operating frequency band with octave tuning is not less than 60 dB;
Mic input sensitivity is not less than minus 23 dBFS when applying an acoustic signal with a frequency of 1 kHz and a level of 94 dB SPL;