STN-29

Regarding CD-DA volume settings

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Contents

■Summary

When setting the CD-DA volume in the SEGASATURN application, lower the CD-DA level by 6dB so that it does not differ significantly from the music CD playback volume on the multiplayer screen.

■How to deal with it

The specific setting method is described below.

1. When setting directly to the hardware
2. When using SATURN Sound Driver
3. When using the sound I/F library

■Supplementary information

When you want to actively change the CD-DA level, such as when creating a special effect, use the music CD level in the multiplayer as a reference, and adjust the balance so that there is no significant difference in volume.

■ 1. When setting directly to the hardware

To operate, set EFSDL[2:0] of the slot-specific control register from 111b (-0 dB) to 110b (-6 dB). Regarding CD-DA, the slot numbers are 16 and 17 on the left and right respectively.

Left channel : Slot number 16: Write FDH to address 100200H+17H.
The contents of FDH are: EFSDL[2:0]=110b (output level) EFPAN[4:0]=11111b (stereolocation data)

Right channel : Slot number 17: Write CFH to address 100220H+17H.
The contents of CFH are: EFSDL[2:0]=110b (output level) EFPAN[4:0]=01111b (stereolocation data)

The addresses from the main CPU are for the left and right respectively.

Left channel =25B00200H+16H

Right channel =25B00200H+16H

It becomes.

Note:

Be sure to access the word from the main CPU.

reference:

"HARDWARE MANUAL/SCSP User's Manual" ■4.1 Register Map

■ 2. When setting using “SATURN Sound Driver”

Use the sound control command CD-DA Level (command number 80H). Change the data from E0H (-0dB) to C0H (-6dB).
Specifically, write the following data to Command Block 1 (+00H) of Host interface work(700H).

data	80H	00H	C0H	C0H
meaning	COM	dummy	left volume	right volume

reference:

"Sound Driver Programmer's Guide"
3. Sound control command/ ●80H CD-DA LEVEL

■ 3. When setting using the sound I/F library

Use the Function CD-DA Level setting.
Change the setting value from 0xE0 (-0dB) to 0xC0 (-6dB) for both left and right.

Format:
SND_SetCdLev(0xC0,0xC0)

reference:

"Programmer's Guide/Sound I/F Library User's Manual"
CD-DA Level setting/SND_SetCdDaLev