Abstract A monophonic musical instrument having a variable frequency oscillator including an amplifier, a plurality of frequency determining networks whose input sides are connected to the output side of the amplifier, a tapped resistor having a plurality of taps several of which are respectively connected to the output sides of the frequency determining networks, and a plurality of switching elements each connected between each of the taps and the input side of the amplifier thus constituting a positive feed-back loop; a plurality of key switches; a latching selector having output lines respectively connected to the switching elements and associated key switches so that the closure of the key switch makes the corresponding one of the output lines to deliver a gating signal to render the corresponding switching element conductive; and circuit means for providing rising and sustaining characteristics to the output signal of the oscillator.
A monophonic musical instrument which comprises: a variable frequency oscillator including an amplifier, a plurality of frequency determining networks whose input sides are connected to an output side of said amplifier, a resistor having a plurality of taps a corresponding number of which are respectively connected to output sides of said frequency determining networks, a plurality of switching elements each having a control electrode and connected between each of said taps and an input side of said amplifier thus constituting a positive feed-back loop, and an output terminal connected to said output side of said amplifier; a latching selector including a plurality of key switches, memory means connected to said key switches and a plurality of output lines connected to said memory means, each said output line corresponding to each of said key switches and connected to said individual control electrode of each said switching elements, and upon closure of one of said key switches the corresponding one of said output lines delivering a gating signal to render its corresponding switching element conductive; and circuit means connected to said output terminal which is connected to the output side of the amplifier for providing rising and sustaining characteristics to an output signal from the oscillator.
Claim 2
Dependent Claim
204 words
A monophonic musical instrument which comprises: a variable frequency oscillator including an amplifier, a plurality of frequency determining networks whose input sides are connected to an output side of said amplifier, a resistor having a plurality of taps a corresponding number of which are respectively connected to output sides of said frequency determining networks, a plurality of switching elements each having a control electrode and connected between each of said taps and an input side of said amplifier thus constituting a positive feed-back loop, and an output terminal connected to said output side of said amplifier; a latching selector including a plurality of key switches, memory means connected to said key switches and a plurality of output lines connected to said memory means, each said output line corresponding to each of said key switches and connected to said individual control electrode of each said switching elements, and upon closure of one of said key switches the corresponding one of said output lines delivering a gating signal to render its corresponding switching element conductive; and circuit means connected to said output terminal which is connected to the output side of the amplifier for providing rising and sustaining characteristics to an output signal from the oscillator.