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small red LED light. Recordings via the internal microphone are saved as MP3 files with a quality of 128
kbps.
4.1.4.6.
Recordings from an external microphone or other line-in sources
In order to improve the quality of your voice recording, you can connect an external microphone. It is also
possible to use a stereo audio cable to connect external audio sources to the line-in port on your Milestone
312 Ace. As described in the section entitled "External microphones and line-in" M312 Ace automatically
switches from the internal microphone to record on the external microphone or line-in. When recording
with an external microphone, it does not change the mode of operation, but the recording quality is
considerably improved.
Once an external microphone or a stereo audio cable is connected, "Local Settings" recording-related
choices appear in the menu which you should definitely consider and change them if necessary before
recording something. The options are:
•
Recording source: External microphone or line-in.
•
Recording environment conference, outdoor, studio or your own settings.
•
Recording quality: MP3 128-320 kilobits per second (kbps).
•
Channels: Stereo or Mono.
•
Recording volume: Automatic or 10 to 100 percent.
•
Noise Filter: On / Off.
Make the changes you want to achieve the best possible quality.
Keep in mind please that the correct specification of the recording source is important. Your M312 Ace
distinguishes between an external microphone and a line-in source. If you connect, for example, a radio,
CD, DVD player or PC sound card and in the "Local Settings" select an external microphone instead of
Line-in to specify the recording source, connected devices could (in very rare cases) be damaged.
Check the other options in the "Local Settings". From the item "Recording environment" you can choose
between 3 predefined profiles and 3 custom profiles (for example, "Own setting 1"). The latter can be
defined by yourself. For this you can use the settings "recording quality", "channels", "Recording Volume"
and "Noise Shield" which are all available. In the case of the predetermined profiles, such as "studio", the
parameters are not changed.
Note: The "Noise Filter" reduces noise and allows voice recordings in vehicles. The rumble of gears or
motors is effectively suppressed by a highpass filter at 100 Hertz.
Note: Recordings via external microphone or line-in can be monitored through headphones.
Caution: Do not change the recording source if an "External microphone" is used. This setting provides the
connection with 2 volts and could damage connected devices, which can not handle additional power.
4.1.5.
Send Radio (FM Transmitter)
One of the most interesting innovations of M312 Ace is sending content via VHF to a household or car
radio. This allows all content within about 10 meters to be received on a regular radio receiver in very high
quality. Typical applications are listening to books or audio on a home stereo system or on the road in a
car.
Send Radio is activated from the menu "Local Settings" in the functions Audio, Books and Radio. When
appropriate menu item is selected, right arrow activates and left arrow deactivates Send Radio. the
transmission frequency can be increased by pressing the "Right arrow" the frequency is increased by a few
steps until it reaches 108 megahertz and will then be decreased down to 87.5 megahertz. To switch off
transmitting, press the "Left arrow".
To transmit effectively, an antenna is required. Plug a pair of headphones into the headphone jack. Audio
will sound simultaneously from the built-in speakers. In practice, simple, inexpensive headphones prove
