Ulead 1.0 - Manual (Page 88)

4—16 SpruceUp User’s Guide
SpruceUp Supported Audio Formats
Following is a list of SpruceUp supported audio file types:
• MPEG-1 Layer 2 audio (.m1a, .mpa, or .abs) with bit-rates of 64kbps to 384kbps; 192
kbps and 224 kbps are typical.
• Dolby Digital (AC-3) audio (.ac3 — mono up to six channels) with bit-rates of 64kbps
to 448kbps; 192 kbps 224kbps and 448 kbps (for 5.1) are typical.
• WAV audio (.wav — Windows uncompressed PCM audio; the most common Windows
audio format), 16 bit 48Khz only.
• PCM audio (.pcm — “raw” pulse code modulation audio; similar to WAV, but without
“header” and other file information), 16 bit 48Khz only.
• AIFF audio (.aif — Audio Interchange File Format uncompressed PCM audio; the most
common Macintosh audio format), 16 bit 48Khz only.
Be aware that the WAV, PCM, and AIFF uncompressed audio formats, while providing
excellent quality, require large file sizes. This can be very important if your goal is to write
to CD-R.
Disc Space Math
This is to explain a bit about the math used to create the graph comparing the various audio
bit-rates.
Uncompressed
SpruceUp supports only 16-bit audio sampled at 48Khz.
First you need to convert the 48Khz sample rate to kbps (kilo bits per second) by
multiplying 48Khz by 16 (the number of bits), giving a 768kbps rate. This is for one channel
– double this for two channels, making it 1,536kbps.
Now multiply this times the number of seconds; in the example 60 seconds was used. This
leaves 92,160kbs. Since we are used to thinking of disc space in terms of bytes and not
bits, divide this number by 8 (the number of bits in a byte) and you get the final disc space
amount required, 11.52MB.
Compressed
Use the same process as above, skipping the multiplying the bits times the sample rate. For
the 448kbps rate, multiply 448kbps by 60 seconds. This gives 26,880kbs. Divide this by 8,
and the file size is 3.36MB.