Marantz PMD670 - Manual (Page 28)

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PCM
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.wav/.bwf
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default Algor/File
Stereo
Mono
Dig-In
MP2
MP3
PCM
MP2
MP3
PCM
MP2
MP3
384,256,192,128,96,64
320,256,160,128,80,64
160,128,80,64,40,32
160,128,80,64,40,32
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192,128,96,64,48,32
384,256,192,128,96,64
320,256,160,128,80,64
.mpg/.bwf
.mp3/.bwf
.wav/.bwf
.mpg/.bwf
.mp3/.bwf
.wav/.bwf
.mpg/.bwf
.mp3/.bwf
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Algor/File
The PMD670 can record in a variety of compres-
sion algorithm, associated bit rate, file format, and
recording type (channels recorded) parameters.
See explanations below and chart in right column.
First select your input device (internal micro-
phone, microphone(s), Line in, or digital input).
Second select your input channel choice with the
INPUT button, see page 17.
Recording Type
The recording type can be stereo (two channels
of recording) mono (one channel of recording) or
digital. This is set by your choice of input device
and input channel choice.
Algorithm
The PMD670 can record using three methods two
of which are compression algorithms: PCM, MP3,
and MP2.
PCM (Pulse Code Modulation) is
uncompressed. These are high quality audio
files used in the recording industry. For ex-
ample, for recording CD quality music. PMD
Edit and other professional level computer
applications are available for computer process-
ing of PCM files.
MP3 (MPEG1 Layer III) is highly compressed,
and creates relatively small files that are com-
monly used to transfer files on the internet.
MP2 (MPEG1 Layer II) is a compressed file
format that is commonly used in broadcasting.
MP2 audio is a higher quality than MP3. This is
especially useful when lower bitrates are used.
If you are a news reporter you will probably
want to record in MP2 format using the .bwf
extension.
Sample Frequency
Sample frequency is measured in kHz (kilo
Hertz). The sample frequency is the number of
samples of the audio wave(s) per second. For
example, the PMD670 can record PCM at 48 kHz
that is 48,000 samples per second.
Bit Rate
The bit rate for PCM is constant at 768kbps/ch.
MP2 and MP3 can be recorded at a number of
different bit rates.
File Format
The file format (3 character computer file exten-
sion) might be .wav, .bwf, .mpg or .mp3. Broad-
cast Wave Files (.bwf) include identification codes
in the file header.
Chart of Algorithm/File Parameters
Column
2. selected by input device and input channel
choice
3. file choice
4. sample frequency
5. bit rate
6
file extension