1. An apparatus comprising: a processor; and a memory including computer program code, the memory and the computer program code configured to, with the processor, cause the apparatus to at least: select a real glottal pulse from among one or more stored real glottal pulses based at least in part on a property associated with the real glottal pulse; utilize the real glottal pulse selected as a basis for generation of an excitation signal; and modify the excitation signal based on spectral parameters generated by a model to provide synthetic speech and by filtering the excitation signal based on spectral parameters generated by a hidden Markov model framework.