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.
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PCM |
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Chart of Algorithm/File Parameters
Column
2.selected by input device and input channel choice
3.file choice
4.sample frequency
5.bit rate
6file extension
- 28 -