Electronic music box circuit

Details Electronic music box circuit Electronic music box circuit

1977-04-06

1978-05-23

Weldon, Ulysses

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

58 16D, 58 575, 84 101, 84 103, 84 124, 340384E, 58 23R, G04B 2108

Patent

active

040903494

ABSTRACT:
An electronic music box circuit is provided which includes a pulse generator, a read only memory having address lines to be energized in a predetermined order by the output pulse signals from the pulse generator and memory cells arranged in accordance with a given melody, and a frequency-divider which divides the frequency of the output pulse signal from the pulse generator to produce a plurality of signals with different frequencies. In the read only memory, when one of the address lines is energized, a musical scale signal selection circuit and a signal level selection circuit are energized so that an output signal with a frequency selected from the output signals of the frequency divider is generated from the scale signal selection circuit while at the same time an output signal with a selected signal level is generated from the level selection circuit. The output signals from the scale signal and level signal selection circuits are supplied to a loudspeaker thereby to generate a predetermined sound.

REFERENCES:
patent: 3549776 (1970-12-01), Shiga et al.
patent: 3637914 (1972-01-01), Hiyama
patent: 3840691 (1974-10-01), Okamoto
patent: 3861263 (1975-01-01), Okudaira
patent: 4010667 (1977-03-01), Kniepkamp

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