The inflection parameter, i.e. the pitch range, allows to change the expressiveness of the synthesized voice. This is supported by the DEC talk synths, and software synthesizers such as espeak/espeak-ng. Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org> Link: https://lore.kernel.org/r/20200425193226.nv3zfd4k3xavi353@function Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>