Electronic musical apparatus
阅读：520发布：2024-01-03
专利汇可以提供Electronic musical apparatus专利检索，专利查询，专利分析的服务。并且An electronic musical instrument in which the fingerboard of a guitar is replaced by capacitive touch contact switches simulating all of the fret positions of a string. The touch plates are coupled to various oscillators and the output frequency is amplitude modulated by a transducer produced output signal from a set of strings which are plucked. This output signal is stretched and shaped as desired to modulate the audio frequency signal and produce the final musical output.，下面是Electronic musical apparatus专利的具体信息内容。
1. Electronic musical apparatus comprising, string means adapted for bowing or plucking, a plurality of discrete touch actuated switch means for simulating the fingerboard of a stringed musical instrument each of said switch means corresponding to a predetermined audio frequency signal, oscillator means coupled to said switch means and responsive to the selective actuation of any one of said switch means for generating said predetermined audio frequency signal corresponding to the switch means which has been actuated, transducer means in proximity to said string means responsive to the physical displacement of said string means; and modulating means coupled to said oscillator means and transducer means and responsive to the actuation of said string means into vibration concurrently with the actuation of said one switch means for modulating said audio frequency signal.
2. Electronic musical apparatus as in claim 1 where said switch means include fixed wire segments for forming virtual capacitors when a human finger is placed in proximity with a segment.
3. Electronic musical apparatus as in claim 1 where said switch means include touch actuating means arranged in a straight line corresponding to the various fingering positions of a string in the same physical location.
4. Electronic musical apparatus as in claim 1 where said modulating means includes waveshape modifying means for modifying the output of said transducer means.
5. Electronic musical apparatus as in claim 1 including tuning means for said oscillating means located in a position corresponding to the tuning machine of the simulated fingerboard.
6. Electronic musical apparatus as in claim 1 where said plurality of switch means include a common radio frequency oscillator for generating an alternating signal which charges virtual capacitors formed by touching a predetermined portion of said switch means.
7. Electronic musical apparatus as in claim 1 where said switch means includes means coupled to said modulating means and responsive to the deactivation of said switch means to disable said modulating means.
8. Electronic musical apparatus as in claim 1 where said modulating means includes first and second series coupled balanced modulators said modulators providing a logarithmic modulation characteristic.
9. Electronic musical apparatus as in claim 1 where said transducer means includes first transducer means primarily responsive to longitudinal mode vibrations of said string means and includes second trAnsducer means primarily responsive to transverse mode vibrations of said string means.
10. Electronic musical apparatus as in claim 1 where said transducer means includes piezoelectric elements mechanically coupled to said string means.
11. Electronic musical apparatus as in claim 1 including harmonic control means coupled to said oscillator means for modifying the harmonic content of the audio frequency signal output of said oscillator means said harmonic control means including variable integration means.
12. Electronic musical apparatus as in claim 11 where said variable integration means comprise a capacitor coupled across a balanced modulator said modulator including variable gain control means to vary the effective capacitance value of said capacitor.
13. Electronic musical apparatus as in claim 11 where said harmonic modulator is coupled and responsive to said transducer means.
14. Electronic musical apparatus as in claim 11 where said oscillator means produce sawtooth type signals and said variable integration means attenuate high harmonics of said sawtooth signals.
15. Electronic musical apparatus as in claim 1 including tuning means for said oscillator means said tuning means being coupled to a common junction and together with means for warying the voltage level of said junction to simultaneously vary the frequencies of the audio frequency signals generated by said oscillator means.
16. Electronic musical apparatus as in claim 15 where said means for varying said voltage level includes a potentiometer.
17. Electronic musical apparatus as in claim 15 together with foot pedal means for controlling said potentiometer.
18. Electronic musical apparatus as in claim 15 where said means for varying said voltage level includes continuous potentiometer means and detented potentiometer means and option switch means for selecting one of said potentiometer means.
19. Electronic musical apparatus as in claim 1 where said oscillator means includes at least one unijunction transistor.
20. Electronic musical apparatus comprising, transducer means adapted for actuation by a human hand, a plurality of touch actuated switch means each including a fixed wire segment for forming a virtual capacitor with a human finger, each of said switch means corresponding to a predetermined audio frequency signal, oscillator means coupled to said switch means and responsive to the selective actuation of any one of said switch means for generating an audio frequency signal corresponding to the switch means which has been actuated; and modulating means coupled to said oscillator means and transducer means and responsive to the actuation of said transducer means concurrently with the actuation of said one switch means for modulating said audio frequency signal.
21. Electronic musical apparatus as in claim 20 where said modulating means includes harmonic control means coupled to said oscillator means for modifying the harmonic content of the audio frequency signal output of said oscillator means said harmonic control means including a variable symmetry chopper driven by said oscillator means for producing a pulse type output signal having a variable pulse width.
22. Electronic musical apparatus as in claim 21 together with control means coupled to said chopper for varying said pulse width.
23. Electronic musical apparatus as in claim 21 where said chopper includes a saturated differential amplifier.
24. Electronic musical apparatus as in claim 21 where said oscillator means produces sawtooth type signals and said chopper clips said sawtooth signals to produce said pulse type output signal.
25. Electronic musical apparatus as in claim 21 where said chopper is coupled and responsive to said transducer means for varying the pulse width of said output signal.
26. Electronic musical apparatus as in claim 20 where said touch actuated switch means includes means responsive to the skin pressure of a finger on a wire segment of said switch means for modifying tHe frequency of said audio frequency signal of said oscillator means.
27. Electronic musical apparatus as in claim 26 where said touch actuated switch means includes a radio frequency oscillator for generating an alternating signal which charges virtual capacitors formed by said finger touching said wire segment said radio frequency oscillator having an input current proportional to said skin pressure said switch means also including control means responsive to said input current for proportionately modulating said frequency of said audio frequency signal.
28. Electronic musical apparatus as in claim 20 together with filtering means having an input coupled to the modulated output of said modulating means and an output to audio transducer means.
29. Electronic musical apparatus as in claim 28 where said filtering means has a frequency filtering characteristic which is variable to provide control of the timbre of said audio frequency.
30. Electronic musical apparatus as in claim 29 where said filtering means includes a plurality of pi sections comprising an inductor and two capacitor legs together with switching means for coupling said input and output to any two adjacent pi sections at any one time for providing said variation of said filtering characteristic.
31. Electronic musical apparatus as in claim 28 together with impedance means coupled to said input of said filtering means having an impedance different from the characteristic impedance of said filtering means.
32. Electronic musical apparatus as in claim 31 where said impedance means is variable to provide for control of the richness of said audio frequency.
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