The PMD671 can record from analog or digital inputs, on one channel (mono) or two (stereo), in PCM at 24 or 16 bits, and in MP2 or MP3 compression formats.
For given channels and formats the PMD671 can record at several bit rates and sample frequen- cies.
The file extension (.wav, .mpg, .mp3) is set by the file format chosen (PCM, MP2, MP3) except for BWF files (Broadcast Wave Format). The BWF file extension can be either .wav, or .bwf.
As audio quality goes up (more bits, less com- pression, higher sampling frequency, greater bit rate), the amount of information recorded increases so the amount of time that can be recorded on a CF card of a specific size goes down. See Recording time chart on page 57.
The PMD671 has a sizeable range of file format parameter choices available, but it does not present you with every possible combination.
Your decisions about which File Format parameters to use will depend on the quality level you need for the purpose(s) of your recording versus limitations in recording time.
Note:
At very high audio quality levels, processor power also becomes a limitation. The RAW (Read After Write) and Time Shift features are processor intensive, so in some instances the MONITOR and Verify features and
The File Format chart below follows the PMD671 File Format menu setting procedure as you read columns from left to right.
Note
A full size copy of this chart is on page 58.
Rec Format ChartChannel(s) | Audio | Fs kHz and | File ext. | BWF ext. | ||
(Bit rate kbps) | ||||||
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| 24 bit | 96, 88.2, 48, 44.1 |
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| PCM |
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| wav/bwf |
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| 16 bit | 48, 44.1, 32, 24, 22.05, |
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| 16, 12, 11.025, 8 |
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Stereo |
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| MP2 | 48, 44.1, 32 | mpg/bwf |
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| (384, 256, 192, 128, 96, 64) |
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| 48, 44.1, 32 | mp3/bwf |
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| (320, 256, 160, 128, 80, 64) |
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| MP3 |
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| 24, 22.05, 16 |
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| mp3/bwf | wav/bwf | ||
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| (160, 128, 80, 64, 40, 32) | |||
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| 24 bit | 96, 88.2, 48, 44.1 |
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| PCM |
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| wav/bwf |
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| 16 bit | 48, 44.1, 32, 24, 22.05, |
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| 16, 12, 11.025, 8 |
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Mono |
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| 48, 44.1, 32 |
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MP2 | mpg/bwf |
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| (192, 128, 96, 64, 48, 32) |
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| 48, 44.1, 32 | mp3/bwf |
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| (160, 128, 80, 64, 40, 32) |
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| MP3 |
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| 24, 22.05, 16 |
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| mp3/bwf |
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| (80, 64, 40, 32, 24, 16) |
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The RecFormat setting procedure is usually unnecessary for Digital Input. See page 34. The following applies to inputs from MIC, LINE IN, and the Internal mic.
Channel(s)Choose between Stereo and Mono recording (two or one channel). For PCM recording, Stereo is about twice as time intensive as Mono.
FormatChoose between PCM (16 or 24 bit) or a compression format (MP2 or MP3).
Fs (Sampling Frequency)
Choose the Sample Frequency (in kHz).
Bit rateYou can select a bit rate in kilobits per second (kbps) for a compression format (MP2 or MP3).
File ext. (File extension)
In most cases, you have chosen the file extension by choosing the Format. If you desire a BWF file choose between .wav and .bwf for the file extension.
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