Speech production by unconverted digital signals

Details Speech production by unconverted digital signals Speech production by unconverted digital signals

1989-12-01

1991-07-02

Shaw, Dale M.

Electrical audio signal processing systems and devices

Monitoring/measuring of audio devices

Loudspeaker operation

G10L 702

Patent

active

050292137

ABSTRACT:
Improved speech sounds are produced from an all-software speech generating program on a computer which does not have a digital-to-analog converter by polling a first timer connected to the computer's speaker until a time-out is found, then applying a sample time value to a second timer so connected, and restarting the first timer. This results in the generation of a variable-duty-cycle carrier without interfering with the computer's operation. In an alternative embodiment, the first timer is used to generate an interrupt at regular intervals, and a sample time value from a storage buffer is then applied to the second timer.

REFERENCES:
patent: 4692941 (1987-09-01), Jacks et al.
patent: 4805220 (1989-02-01), Sprague et al.
patent: 4888806 (1989-12-01), Jenkin et al.

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