Decibel Values - Plus/4 Encyclopedia



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Decibel Values

Category
Programming/Audio Programming/General

Topic
The lower nibble (lower 4 bits) of TED register number 17 ($FF11) controls the overall volume of the audio output. The effective output volume levels range from no output (0) to maximum volume (8) in 9 steps. Writing values of 9-15 in the lower nibble are identical to selecting the maximum volume level (8).

The available volume levels correspond to the decibel values below.

Volume	Decibel Value	Notes
15	0.0
14	0.0
13	0.0
12	0.0
11	0.0
10	0.0
9	0.0
8	0.0	(Maximum volume)
7	−1.2
6	−2.5
5	−4.1
4	−6.0
3	−8.5
2	−12.0
1	−18.1	(18.1 dB down from the volume at maximum level)
0	Minus infinity

Note: The decibels are shown as negative values from a maximum of 0.

Keywords
amplitude, volume, decibel