RecFormat
The PMD570 can record in a variety of compression algorithm, associated bit rate, file format, and record- ing type (channels recorded) parameters. See explana- tions and chart below.
First determine the input connection you want to record from; BALANCED IN, ANALOG, or DIGI- TAL IN. Second set the Preset Menu Input choice to correspond with the connection: Bal.In, Unbal., or
RecFormat parameters:
Channels
The recording channel can be stereo (two discrete channels of recording) or mono (one channel of recording). Set to match your inputs.
Algorithm
The PMD570 can record using three methods, PCM and two compression algorithms: MP2, and MP3.
PCM (Pulse Code Modulation) is uncompressed. These are high quality audio files used in the recording industry. For example, for recording CD quality music.
MP3 is highly compressed, and creates relatively small files that are commonly used to share files on the internet.
MP2 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 Broadcast Wave format (BWF) using MP2 compression.
Marantz Professional's PMDEdit application software and other professional level computer applications are available for computer process- ing of PCM, MP2 and MP3 files.
Sampling Frequency
Sampling frequency is measured in kHz (kilo- hertz). The sampling frequency is the number of samples of the audio wave(s) per second. For example, the PMD570 can record PCM at 48 kHz that is 48,000 samples per second.
Bit Rate
The bit rate for PCM is constant for each sampling frequency. MP2 and MP3 can be recorded at a number of different bit rates.
File Format
The file format (3 character computer file extension) can be .wav, .bwf, .mpg or .mp3. Broadcast Wave format, used primarily in the broadcast industry, includes identification codes in the file header.
Chart of RecFormat Parameters
The PMD570 parameter menu settings are extensive but limited to plausible combinations.
This table of parameters reflects the menu setting sequence.
Column
1. input
2. channel(s)
3. audio format
4. sampling frequency
5. bit rate
6. file format
7. extension (if BWF chosen in 6)
1 | Bal.In, Unbal. or |
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| 3 |
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| 48 | - - - | (1536) |
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| 44.1 | - - - | (1412) |
| .wav/ |
| .wav/ |
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| PCM | 32 | - - - | (1024) |
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| 24 | - - - | (768) |
| .bwf |
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| 22.05 | - - - | (704) |
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| 16 | - - - | (512) |
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| MP2 | 48 | 384,256,192,128,96,64 |
| .mpg/ |
| .wav/ | |
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| 44.1 |
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| .bwf |
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Stereo |
| 32 |
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| 48 |
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| .mp3/ |
| .wav/ |
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| 44.1 | 320,256,160,128,80,64 |
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| .bwf |
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| MP3 | 32 |
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| 24 | 320,256,160,128,80,64 |
| .mp3 |
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| 22.05 |
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| 16 |
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| 48 | - - - | (768) |
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| 44.1 | - - - | (705.6) |
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| PCM | 32 | - - - | (512) |
| .wav/ |
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| 24 | - - - | (384) |
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| .bwf |
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| 22.05 | - - - | (352) |
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| 16 | - - - | (256) |
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| 48 | 192,128,96,64,48,32 |
| .mpg/ |
| .wav/ | |
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| MP2 | 44.1 |
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| .bwf |
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Mono |
| 32 |
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| 48 |
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| .mp3/ |
| .wav/ |
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| 44.1 | 160,128,80,64,40,32 |
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| .bwf |
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| MP3 | 32 |
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| 24 |
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| 160,128,80,64,40,32 |
| .mp3 |
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| 22.05 |
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| 16 |
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