AUDAC MSP40, Руководство пользователя

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Mono/stereo:
The recording for MP3 filetypes can be switched in various types of mono / stereo modes,
including ‘
Joint stereo
’, ‘
Dual stereo
’, ‘
Mono (left input)
’ and ‘
Mono mix
’. Toggle between
various recording modes by highlighting ‘Mono / stereo’ and (navigate through rotary dial)
and pressing the rotary dial.
Using ‘
Joint stereo
’ mode, the similarities and differences between both left and right
channels are individually encoded. This improves the compression efficiency at a slight loss
of separation.
Using ‘
Dual stereo
’, both left and right channels are individually encoded as completely
separate signals. Each channel uses half of the available bitrate, for example by a 128 kbit
recording, each channel would take 64 kbit.
Using ‘
Mono (left input)
’, only the signal available on the left recording input will be recorded
as a single (mono) audio signal.
Using ‘ Mono mix’ , both left and right signal inputs will be summed to a mono signal, which
will be recorded as a single (mono) audio signal.
MP3:
The MP3 recording settings can be selected between ‘ Variable bitrate’ and ‘ Constant
bitrate
’. In constant bit rate mode, a fixed bitrate is used for the entire track resulting in
consistent and predictable file sizes. In variable bitrate mode, the bitrate is adapted according
to the complexity of the audio. For simple passages, the system automatically turns the
bitrate down, saving valuable data bits while retaining audio quality. During more complex
passages, the system automatically turns the bitrate up, using more databits to retain the
same level of audio quality. In general, the variable bitrate gives better results in terms of
audio quality, while the constant bitrate is better for compatibility (mainly with older systems).
The bitrate for the audio recording can be selected between 64 kbps, 96 kbps, 128 kbps, 192
kbps, 256 kbps and 320 kbps. A bitrate of 192 kbps is generally accepted as good-quality,
while a 256 kbps recording corresponds with CD quality. For constant bitrate recordings, the
selected bitrate is constant throughout the entire track, while for variable bitrate recordings
the nominal bitrate is defined, which could be influenced by the complexity and detail of
the audio.
OGG Vorbis:
For OGG Vorbis recordings, the quality settings can be selected by a number from ‘0’
to ‘9’, whereby ‘0’ corresponds with a nominal bitrate of 64 kbps and ‘9’ corresponds
with a nominal bitrate if 320 kbps. Starting from ‘6’ (192 kbps) the recording is generally
accepted as a good-quality recording, while ‘8’ (256 kbps) corresponds with CD quality.
An OGG recording provides the same quality for a lower filesize, compared to MP3.
WAV:
For WAV recodings, the sampling rate can be selected between 8 kHz, 16 kHz, 24 kHz, 32
kHz and 48 kHz with a fixed bit depth of 16 bits per sample. Depending on the application, the
suitable sample rate can be selected. For high-quality music recordings, it is recommended
to always select the 48 kHz sample rate, while for voice announcements or other spoken
message recordings, lower sample rates can be sufficient.