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TAPE PREPARATION INSTRUCTIONS
To get the best audio reproduction, it is essential to start with a high-quality
recording. In order to load into memory properly, your audio tape program must
conform to the following guidelines exactly.
1. Use only normal bias
(Type I) tapes not exceeding 90 minutes in capacity.
2. Do not
use high bias, chrome, or metal tapes.
3. Do not
use DOLBY
or any other noise reduction system.
4. Record your production in 2-channel mono. The audio level should average
0dB while peaking no hotter than +6dB.
5. Start the recording no later than 20 seconds from the beginning of the tape.
6. The message cannot have embedded passages averaging less than -25dB for
longer than 5 seconds, because the unit interprets this as silence, signifying the
end of the load.
7. There should be at least 5 seconds of silence at the end of the message to
signify the end of the message.
MESSAGE LENGTH TABLE
Message length is determined by the memory size of your unit and the
bandwidth/sample rate setting. Higher bandwidth settings provide better audio
quality but also reduce the total message length.
Refer to the following table to find your maximum message length.
Memory Size
4 Min. 8 Min. 16 Min. 32 Min.
Bandwidth
Sample
Rate
4 Min. 8 Min. 16 Min. 32 Min. 3.5 KHz 34 KBps
2 Min. 4 Min. 8 Min. 16 Min. 7.0 KHz 69 KBps
90 Sec. 3 Min. 6 Min. 12 Min. 7.0E KHz 92 KBps
Table 2 - Message Length
SoundBrick 500 01/08/2001
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