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Modifications: U49-300h, U49-1200h (last digits in the models' names show the maximum recording duration (sampling rate 8 kHz, 2 bit ADPCM) in hours).
Thanks to 5 divided microphones the U49 voice recorder can record audio from certain direction at a distance of 15 m and considerably reduce background noise of the microphone.
What makes it possible? In case the recorded object is situated aside from the direction of the microphones operation the signal is “cancelled” due to phase difference of sound striking each microphone. In case the recorded object is situated straight in the direction of the microphones operation – sound waves are summarized and the signal is amplified.
Microphone noise is reduced according to the same principle: the noise sound waves do not coincide and the recorded sound waves summarize, that’s why the sound is “cancelled” while the target sound is amplified on the contrary. Noise reduction runs according to the formula: Аn = А1 /sqr(N) with N being the number of microphones, А1 – the noise background of one microphone, Аn - the noise background of N microphones.
Microphone operation coverage area bears some resemblance to an oval. (see Fig.):
The readings for the diagram were taken with the voice recorder put into the sound-proof open drawer at the distance of 1.5 m from the sound source.
Looking at the diagram we can see that the sound is best of all recorded in the direction of the voice recorder, and much worse on each side and behind of it.
Judging by all the above we can conclude that EDIC-mini Tiny16 U49 will help you to record exactly what you need without anything irrelevant.
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Technical characteristics
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Dimensions
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143×13×18 mm
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Weight
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24 g (battery not included)
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Case
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Metal
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Case color
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Charcoal
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Record source
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Built-in microphone; the connection to an external microphone is possible
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Record playback
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Via PC
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Interface
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USB 1.1 (up to 0.7 Mb/sec)
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Operation indicator
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LED
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Control
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Switch
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Sensitivity and frequency characteristics
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· Sensitivity of built-in microphone up to 16 m
· Sensitivity of external microphone up to 15m
· Signal-to-noise ratio -80 dB
· Frequency band when recording 100 – 10000 Hz
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Audio codec
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16 bits
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Record mode
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Mono
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Wave file format after conversion
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wav
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Compression method
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- without compression
- u-Law
- 4 bit ADPCM
- 2 bit ADPCM
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Sample rate
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- 5.5 kHz
- 6.6 kHz
- 8 kHz
- 10 kHz
- 13.3 kHz
- 20 kHz
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Built-in AGC system
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From -1 to +40 dB
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Operating temperature range
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From 0 to +40 ºС
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Additional functions
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· Universal supply - AAA rechargeable or standard batteries
· Built-in AGC system
· Voice Activating System VAS
· Password protection
· Daily timer and once timer
· The option to use as a flash-drive
· Linear and circular recording
· “Digital signature” of recordings
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Memory
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Data carrier
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Built-in Flash-memory
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Maximum recording duration in hours (sampling rate 8 kHz, 2 bit ADPCM)
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- 300h (2Gb)
- 600h (4Gb)
- 1200h (8Gb)
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Supply
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Power supply
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Standard battery or AAA rechargeable battery
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Battery life
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· in record mode (8 K Hz, without compression): up to 110 hours
· in record mode with VAS (audio signals below threshold): up to 13 days
· in stand-by mode: up to 9 months
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Warranty
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1 year
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Delivery set:
Voice recorder
USB cable to connect the device to a PC
3 AAA batteries
Instructions
Cover removing device
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