Common options

A short on-line description can always be obtained using the -help option. Every runtime also have a -verbose switch to run in verbose mode and a -version switch to print out the version number. The four runtimes which take a signal as input ( sfbank, sfbcep, slpc and slpcep) shares some common options described below:

• -sample-rate=n - set sample rate of the input signal (default is 8 kHz).
• -sphere - indicates the input signal file is a SPHERE file.
• -window=s - set the analysis window type. s can be none, haming or hanning (default is haming).
• -length=f - set the analysis window length (default is 20.0 ms).
• -decay=f - set the analysis window decay (default is 10.0 ms).
• -alpha=f - set the spectral resolution factor $\alpha$ (see sec. ).
• -pre-emphasis=f - set coefficient of the $1 - k z^{-1}$ pre-emphasis filter (default is 0.95).
• -energy - output log-energy
• -scale-energy=f - scale log-energy according to $\ln e = (\ln e - \ln e_{\mbox{\tiny max}}) \; f + 1$.

In all the programs, either the input file or the output file can be omitted in which case input is made from stdin and output to stdout. In addition, waveform input from stdin can be explicitely specified using a dash '-' as the waveform input filename, thus making it possible to pipe the output of a command (e.g. an MPEG audio decoder² into the input of the SPro command.