y = dbspl(insig); y = dbspl(lvl); y = dbspl(insig,'ac');

`dbspl(insig)` calculates the sound pressure level (SPL) in dB of *insig*
considering the AMT default level convention, which is per default SPL of
93.98 dB for an RMS of 1.

`dbspl(lin)` outputs the SPL in dB for the linear level of *lin*.

`dbspl(insig,'dboffset',dboffset)` computes the SPL (in dB) of *insig*
for a level convention different than the AMT default by considering
an SPL offset given by *dboffset* such that \(dbspl = 20*log10(rms(insig)) + dboffset\).
Some commonly used offsets are:

- \(dboffset = 0\). With this offset, \(dbspl(insig) = 20*log10(rms(insig))\). This convention was used for the development of the lopezpoveda2001 and breebaart2001.
- \(dboffset = -20*log10(20e-6) = 93.98\). This corresponds to the convention of the SPL reference of \(20 \mu Pa\). This addresses signals representing pressure in Pascal.
- \(dboffset = 100\). This convention was used for the development of dau1996.

The AMT default level convention can be obtained by:

dboffset = dbspl(1);

In addition, DBSPL takes the following flags at the end of the line of input parameters:

'ac' |
Consider only the AC component of the signal (i.e. the mean is removed). |

'dim',d |
Work along specified dimension. The default value of [] means to work along the first non-singleton one. |

B. C. J. Moore.
*An Introduction to the Psychology of Hearing*.
Academic Press, 5th edition, 2003.