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US 4,001,816 AGranted
Electronic chime
AssigneesMatsushita Electric Works, Ltd., Matsushita Electric Industrial Co., Ltd.
InventorsKiyoshi Yamada, Kazushige Morisue, Hiroshi Shimomura, Yoshio Imamura
Life of this patent
Estimating the term…
Abstract
An electronic chime wherein at least two different audible frequency signals forming chime sound are generated by a frequency divider oscillated by an oscillating circuit capable of adjusting its output standard frequency clock pulse. These audible frequency signals are respectively amplitude modulated so as to be attenuated stepwise, and the chime sound is generated by such modulated signals and caused to disappear at attenuated state.
Claims10
An electronic chime comprising:
- a. a current source,
- b. at least a calling push button,
- c. a switching circuit connected to said current source and calling push button for feeding a supply voltage to all attached component circuits by an operation of said push button and interrupting said supply voltage upon receiving a resetting signal,
- d. an oscillating circuit for generating a standard frequency clock pulse upon receiving the supply voltage,
- e. a first frequency divider for generating at least two signals of different audible frequencies upon receiving said clock pulse from said oscillating circuit,
- f. an initial condition determining circuit for generating a one-shot pulse signal upon actuation of the push button,
- g. a second frequency divider receiving said at least two signals from said first frequency divider and one-shot pulse signal from said initial condition determining circuit and generating at least a rhythm determining pulse signal and a plurality of digital modulation signals, and further generating a resetting pulse to be applied to said switching circuit,
- h. a selective controlling circuit receiving said audible frequency signals from said first frequency divider and said rhythm determining pulse signal from said second frequency divider to alternately arrange the audible frequency signals at a rhythm determined by the rhythm determining pulse signal,
- i. a digital modulator for modulating said alternately arranged audible frequency signals from said selectively controlling circuit in response to said plurality of digital modulation signals from the second frequency divider,
- j. an amplifier for amplifying said modulated signals from said digital modulator, and
- k. a speaker for converting said modulated signals amplified to a chime sound.
8 more elements
An electronic chime comprising:
- a. a current source,
- b. a plurality of calling push buttons including means for generating a separate output denoting a particular one of said push buttons actuated,
- c. a switching circuit connected to said current source and calling push buttons for feeding a supply voltage to all attached component circuits responsive to said output denoting at least one of said push buttons actuated and interrupting said supply voltage upon receiving a resetting signal,
- d. an oscillating circuit for generating a standard frequency clock pulse upon receiving the supply voltage,
- e. a first frequency divider for generating at least two signals of different audible frequencies upon receiving said clock pulse from said oscillating circuit,
- f. an initial condition determining circuit for generating a one-shot pulse signal upon actuation of the push button,
- g. a second frequency divider receiving said at least two signals from said first frequency divider and said one-shot pulse signal from said initial condition determining circuit and generating a plurality of rhythm determining pulse signals corresponding in number to the plurality of push buttons and a plurality of digital modulation signals, and further generating said resetting pulse to be applied to said switching circuit after a predetermined number of cycles of said rhythm determining pulse signals,
- h. a selective controlling circuit receiving said audible frequency signals from said first frequency divider and said rhythm determining pulse signals from said second frequency divider and including means for selecting one of the rhythm determining pulse signals depending on the output denoting the particular push button actuated to alternately arrange the audible frequency signals at a rhythm determined by the selected rhythm determining pulse signal,
- i. a digital modulator for modulating said alternately arranged audible frequency signals from said selectively controlling circuit in response to said plurality of digital modulation signals from the second frequency divider,
- j. an amplifier for amplifying said modulated signals from said digital modulator, and
- k. a speaker for converting said modulated signals amplified to a chime sound.
8 more elements
Dependencies are inferred from the claim text.