Texas Instruments LPC Speech Chips

The Texas Instruments LPC Speech Chips are a series of speech synthesizer digital signal processor integrated circuits created by Texas Instruments beginning in 1978.

They continued to be developed and marketed for many years, though the speech department moved around several times within TI until finally dissolving in late 2001.

[1][2] Speech data is stored through pitch-excited linear predictive coding (PE-LPC), where words are created by a lattice filter, selectably fed by either an excitation ROM (containing a glottal pulse waveform) or an LFSR (linear-feedback shift register) noise generator.

[5] All TI LPC speech chips until the TSP50cxx series used PMOS architecture, and LPC-10 encoding in a special TI-specific format.

TMS7125) read-only memories which were mask programmed with words required for a specific product.