Horology: time measuring systems or devices – Signalling means – Musical
Patent
1981-11-30
1984-10-23
Isen, Forester W.
Horology: time measuring systems or devices
Signalling means
Musical
84 103, 84 126, 84 113, G10F 100
Patent
active
044785259
ABSTRACT:
Disclosed is a musical envelope control device which is used in an electronic watch with a melody alarm function. The musical envelope control device comprises a memory which stores musical performance data representing pitches and durations of notes; an address counter; a pitch divider which receives pitch data and generates a tone signal in correspondence with the pitch data; a note control circuit which receives note duration data, divides the duration into a preset number of components and then generates a coded signal of a predetermined bit length for each duration component; an envelope decoder which is connected to the note control circuit and converts the coded signals to voltage signals in accordance with a predetermined conversion mode corresponding to a desired envelope waveform; and an envelope control circuit which produces a sound pressure signal having a stepped waveform in response to the voltage signal and which generates a sound signal by synthesizing the sound pressure signal and the tone signal.
REFERENCES:
patent: 3854365 (1974-12-01), Tomisawa et al.
patent: 4010667 (1977-03-01), Kniepkamp
patent: 4267586 (1981-05-01), Uchino et al.
patent: 4328731 (1982-05-01), Gotho et al.
patent: 4368989 (1983-01-01), Kawashima
Isen Forester W.
Tokyo Shibaura Denki Kabushiki Kaisha
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