User Guide
36
6.3 Recording
6.3.1 Recording hints
To obtain high-quality audio recording we recommend you to follow these guidelines:
1.
It is not advisable to perform audio recording while the voice recorder is USB-connected.
2.
Use stereo recording without compression at 16 kHz sampling rate if possible. Stereo recording
provides speech intelligibility even in noisy conditions.
3.
Mono recording allows you to record longer sound signals.
4.
To prevent useful signal loss, use Voice Activation (VA) mode only if input signal level is stable.
5.
Place microphones as close to the useful signal (speech) source as possible and as far from the
acoustic and electromagnetic noise sources as possible. The closer the microphones are placed to
the acoustic signal (speech) source, the smaller is reverberation (echo) and the higher is the gain
level and speech intelligibility.
6.
External microphones are more sensitive and at the same time can be easily concealed (under a
jacket lapel, shirt collar, on the cuff ). During stereo recording external microphones should be
placed at least 15 cm from each other.
7.
Try to place the microphones in such a way as to avoid vibration, impact and rubbing against
other surfaces.
8.
Avoid permanent contact of the voice recorder box or external microphones with rough surfaces
(such as table plate, car, concrete structures).
9.
Note that if mono recording is enabled, only left channel data will be recorded.
10.
To conceal the sound recording process and/or avoid record suppression by special devices (HF
generators) it is advisable to use the internal microphone.
6.3.2 Manual recording start/stop
The recording process can be started/stopped both manually and automatically.
To start recording manually, set the switch on the recorder body (2 in Figure 1) or on the remote control
unit to the
ON
position.
To stop the recording, set the switch to the
OFF
position accordingly.
6.3.3 Voice Activated recording
To perform voice activated recording, first enable
Voice Activation
in the
Record settings
window of
the
Sound Manager Gnome P
software (see 7.3.3) and specify the required VA start/stop threshold, then set
the switch on the recorder body (2 in Figure 1) or on the remote control unit to the
ON
position. The
recording will stop 5 seconds after input gain level falls below the specified threshold.
To terminate voice activated recording, place the switch on the voice recorder (or remote control) to
the
OFF
position.
VA can be used in combination with timer-scheduled recording (see 6.3.4).
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