# US 4,397,210 A · Rhythm sound generator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,397,210 A - Document ID: US4397210A - Status: Granted - Kind: A - Application number: 06/329,964 - Filed: 1981-12-11 - Granted: 1983-08-09 - Earliest claimed: 1981-12-11 - Assignees: CBS Inc. - Inventors: Robert A. Finch - Web page: https://patentgrep.com/patent/US4397210A ## CPC - G10H 1/40: Rhythm - G10H 2250/365: Gensound applause, e.g. handclapping; Cheering; Booing - Y10S 84/12: Side; rhythm and percussion devices - G10H: ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract An electronic circuit triggered by pulses derived from the rhythm pattern generator of an electronic organ simulates the sound of a group of people clapping hands by producing in bursts at least two different sound signals of differing characteristics and combining the signal bursts in a predetermined pattern which causes them to occur in close time proximity to each other but not at the same time. When the combined signal is acoustically reproduced, the resulting sound is simulative of that produced by a group of people clapping their hands in unison. ## Claims ### Claim 1 For use in an electronic organ including a rhythm pattern generator which produces sequences of trigger pulses, each sequence characteristic of a particular rhythm, and a loudspeaker for acoustically reproducing electrical signals generated within the organ, an electronic circuit for producing an electrical signal which when reproduced by the loudspeaker simulates the sound produced when a group of persons clap hands substantially in unison, said circuit comprising: timing circuit means connected to receive a selected sequence of trigger pulses from said rhythm pattern generator for producing a group of trigger signals in timed relationship to each trigger pulse in the said selected sequence and to each other, at least first and second sound signal sources for respectively producing in response to an applied trigger signal first and second signal bursts of differing tonal characteristics, said first sound signal source comprising a source of random noise, means for applying at least one trigger signal of the said group to each of the sound signal sources for causing said sound signal sources to produce a group of signal bursts of differing tonal characteristics in timed relationship to each trigger pulse in the said selected sequence and to each other, means for combining the signal bursts produced by the said at least first and second sound signal sources and producing said electrical signal and means for applying said electrical signal to the loudspeaker. ### Claim 2 (depends on 1) The electronic circuit according to claim 1, wherein said second signal source is a circuit for producing a first ring tone signal having a selected frequency. ### Claim 3 (depends on 2) The electronic circuit according to claim 2, wherein said timing circuit is operative in response to each trigger pulse in the selected sequence from the rhythm pattern generator to trigger said first and second sound signal sources to produce a combined signal comprising a first burst of random noise followed after a predetermined time interval by a burst of first ring tone signal, which is in turn followed by second and third spaced apart bursts of random noise. ### Claim 4 (depends on 3) The electronic circuit according to claim 3, wherein said source of random noise is a source of white noise. ### Claim 5 (depends on 2) The electronic circuit according to claim 2, wherein said second signal source is a gated oscillator. ### Claim 6 (depends on 3) The electronic circuit according to claim 3, wherein said bursts of random noise each have a duration of about 15 milliseconds, wherein said burst of ring tone signal follows the first burst of random noise by about 15 milliseconds, wherein the second burst of random noise follows the ring tone signal by about 15 to 20 milliseconds, and wherein the third burst of random noise follows the second by about 30 milliseconds. ### Claim 7 (depends on 2) The electronic circuit according to claim 2, wherein said circuit further includes a third sound signal source for producing a second ring tone signal differing in frequency from said first ring tone signal, and wherein said timing circuit is operative in response to each trigger pulse in the selected sequence from the rhythm pattern generator to trigger said first, second and third sound signal sources for producing a combined signal comprising a ring tone signal burst from said second signal source followed after a first predetermined time interval by a first ring tone signal burst from said third signal source, which is in turn immediately followed by a burst of random noise of predetermined duration which is in turn immediately followed by a second ring tone signal burst from said third signal source. ### Claim 8 (depends on 7) The electronic circuit according to claim 7, wherein said source of random noise is a white noise source. ### Claim 9 (depends on 7) The electronic circuit according to claim 7, wherein said second and third sound signal sources are ringing oscillator circuits. ### Claim 10 (depends on 7) The electronic circuit according to claim 7, wherein said bursts of ring tone signal each have a duration of approximately 2.5 milliseconds, wherein said first predetermined time interval is in the range from about 25 milliseconds to about 30 milliseconds, and wherein the duration of the random noise burst is in the range from about 25 milliseconds to about 20 milliseconds.