Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1978-09-22
1980-06-24
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
235 92TF, 340347M, 455179, H03K 1302
Patent
active
042097754
ABSTRACT:
A D-A converter for converting a digital signal to a duty factor of a pulse train signal and for averaging the pulse signal by a low-pass filter to convert it to an analog signal is disclosed. A plurality of pulses which are to be selected in accordance with the input digital signal comprise a plurality of basic pulses of different phases and pulse widths derived by frequency division and auxiliary basic pulses which occur at a cycle period which is at least twice as long as a repetition cycle period of the basic pulses. The basic pulses are selected by high order bits of the digital signal while the auxiliary basic pulses are selected by low order bits of the digital signal to produce an output pulse train signal a duty factor of which changes in accordance with the digital signal. The pulse train signal is then averaged to convert it to an analog signal.
REFERENCES:
patent: 3603977 (1971-09-01), Szabo et al.
patent: 3648275 (1972-03-01), Bower
patent: 4085372 (1978-04-01), Mogi et al.
patent: 4087813 (1978-05-01), Minner et al.
Kawashima Kazumi
Koyanagi Yukio
Matsushita Electric - Industrial Co., Ltd.
Sloyan Thomas J.
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