NexLog Recorder User Manual v2.2.0 73
You can experiment with these algorithms to get the best balance between
sound quality and storage space.
Name: Editable with an attached or on-screen keyboard.
The channel name can be up to 64 characters. It can identify the signal source
for each input channel. Telephone number, radio station call letters, ATC
frequency and function, or any other free-form data may be entered here. While
up to 64 characters of data may be entered and saved, display constraints
suggest that you choose the first few characters most carefully. There is no
requirement to modify these identifiers. The factory default “Channel 01” ...
“Channel nn” may be serviceable.
AGC: Activates or deactivates Automatic Gain Control for Analog channels.
Automatic Gain Control assures that recordings take advantage of the full
dynamic range of the recording process. If you record at too high a level, the
signal will “clip” and sound very distorted. If you record at too low a level, the
signal will sound very soft and have a poor signal-to-noise ratio. Enabling AGC
gives extra margin when recording telephone calls where the local party may be
much louder than the distant one-it will boost the gain by up to 24dB when the
distant party is speaking. AGC should be enabled in most cases. It can be
disabled in installations where audio levels are well-controlled (e.g., broadcast
radio stations).
BEEP: Enables a “Beep tone” to signify to callers that the call is being recorded.
Activating the beep places a short, distinctive tone on the respective channel of
the input connector. This tone is approximately 65 milliseconds in duration at a
frequency of 1455 Hz. It serves to indicate that the call is being recorded, and is
required by some state laws. Of course, the beep will only be audible to the
callers if the recorder is connected directly to the telephone line in question; if
an amplifier or other device is interposed it will serve no purpose. Beep tones are
only generated on Analog Input Boards, not on Digital PBX or T1/E1 interface
boards.
DETECT: This parameter determines when an input channel is active and should
be recorded. It establishes the primary recording control for the channel.
The following are valid values for this parameter:
VOX: (default) Starts recording if the voice (vox) or audio input signal is
above the configured Vox threshold setting, and stops recording if the signal
drops below that setting for the configured hold time.
TRUEVOX: [RTP only.] In regular VOX mode for RTP channels, the presence
of data on the line will trigger recording, but some environments will
transmit large durations of data that is actually silence, so this mode will
analyze the contents of the packets and evaluate recording based on the
volume of the contained audio.
TRV: Starts recording if the DC input voltage is lower than the configured
TRV (Tip-Ring Voltage) threshold, indicating an off-hook condition, and stops
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