Delayed vibrato arrangement for an electronic musical instrument
First Claim
1. A vibrato signal generating arrangement for an electronic musical instrument comprising:
- envelope signal generating means for generating an envelope signal which changes from a first potential level to a second potential level in response to and at the instant of key depression, and thereafter changes gradually from said second potential level to said first potential level;
clipping means coupled to said envelope signal generating means and having a predetermined clipping level between said first and second potential levels for clipping off a portion of said envelope signal between said second potential level and said clipping level; and
vibrato signal generating means coupled to said clipping means and driven directly by the output of said clipping means so as to be operative to produce a vibrato signal, said vibrato signal generating means being so arranged that it does not operate at a signal level of the output of said clipping means corresponding to said clipping level and produces the vibrato signal in response to a signal level of the output of said clipping means other than the signal level corresponding to said clipping level and at an amplitude in accordance with the signal level of the output of said clipping means.
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Abstract
A delayed vibrato signal generating arrangement in which an envelope signal which changes from a first potential level to a second potential level at the instant of key depression, and thereafter varies gradually from the second potential level to the first potential level is generated by an envelope signal generator, the peak portion of such envelope signal is clipped off by a clipper, and then a vibrato signal with a gradually increasing amplitude is generated by a vibrato signal generator driven by the output of the clipper. The vibrato signal generator is so arranged as not to operate at the clipped level of the output of the clipper, thereby giving a delay time for delayed vibrato.
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Citations
14 Claims
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1. A vibrato signal generating arrangement for an electronic musical instrument comprising:
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envelope signal generating means for generating an envelope signal which changes from a first potential level to a second potential level in response to and at the instant of key depression, and thereafter changes gradually from said second potential level to said first potential level; clipping means coupled to said envelope signal generating means and having a predetermined clipping level between said first and second potential levels for clipping off a portion of said envelope signal between said second potential level and said clipping level; and vibrato signal generating means coupled to said clipping means and driven directly by the output of said clipping means so as to be operative to produce a vibrato signal, said vibrato signal generating means being so arranged that it does not operate at a signal level of the output of said clipping means corresponding to said clipping level and produces the vibrato signal in response to a signal level of the output of said clipping means other than the signal level corresponding to said clipping level and at an amplitude in accordance with the signal level of the output of said clipping means. - View Dependent Claims (2, 3)
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4. A vibrato signal generating arrangement for an electronic musical instrument comprising:
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envelope signal generating means for generating an envelope signal which changes from a first potential level to a second potential level in response to and at the instant of key depression, and thereafter changes gradually from said second potential level to said first potential level; clipping means coupled to the output of said envelope signal generating means and having a predetermined clipping level between said first and second potential levels for clipping off a portion of said envelope signal between said second potential level and said clipping level; means coupled to the output of said clipping means for generating first and second control signals having a common level corresponding to a clipped level of the output of said clipping means and symmetrical waveforms with respect to said common level which are similar to the output of said clipping means; and vibrato signal generating means coupled to said means for generating said first and second control signals and driven directly by said first and second control signals for generating a vibrato signal with an amplitude proportional to the potential difference between said first and second control signals. - View Dependent Claims (5, 6, 7)
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8. A vibrato signal generating arrangement for an electronic musical instrument comprising:
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envelope signal generating means for generating an envelope signal which changes from a first potential level to a second potential level in response to and at the instant of key depression, and thereafter changes gradually from said second potential level to said first potential level; clipping means coupled to the output of said envelope signal generating means and having a predetermined clipping level between said first and second potential levels for clipping off only a portion of said envelope signal between said second potential level and said clipping level; means coupled to the output of said clipping means for generating first and second control signals having a reference potential level corresponding to the clipped level of output of said clipping means and opposite polarity to each other except for said reference potential level, said control signals having a waveform similar to the output of said clipping means; and vibrato oscillator means coupled to said means for generating said first and second control signals and powered from said first and second control signals for generating a vibrato signal with an amplitude proportional to the potential difference between said first and second control signals. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification