Electronic piano tone circuit
AssigneeThe Quaker Oats Company
InventorWilliam R. Taylor
Life of this patent
Estimating the term…
Abstract
Apparatus for generating an enveloped tone signal includes a digital portion for generating an alternating logical wave form at the desired frequency, and a start pulse for initiating the tone; and an analog portion responsive to the alternating logical wave form and the start pulse for creating the tone, the analog portion including a capacitor responsive to the start pulse for storing a charge and a switching device connected to the capacitor and responsive to the alternating logical wave form for repeatedly bleeding off a portion of the charge from the capacitor in synchronization with the alternating logical wave form, and a transducer connected to the capacitor for producing the enveloped tone signal.
Claims22
Apparatus for generating an enveloped tone signal comprising:
- storage means having an input terminal and responsive to a logical on signal at said input terminal for storing a charge and responsive to an alternating logical off and high impedance signal for producing an enveloped tone signal at said input terminal;
- and
- tri-state tone control means have a tri-state output connected to said input terminal, a logic input and a gate input, said tone control means responsive to a start signal applied to said logic input and a sound signal applied to said gate input for producing a logical on signal in response to said start signal and an alternating logical low and high impedance signal in response to said sound signal.
Tone generating apparatus comprising:
- digital circuit means for generating a digital pulse stream and a start pulse tri-state driver means having an input coupled to said start pulse, a gate coupled to said pulse stream and an output;
- and
- analog sound generation means connected to said output for generating a decaying amplitude tone initiated by said start pulse and corresponding to said pulse stream.
Apparatus for generating an enveloped tone signal comprising:
- digital means for generating an alternating logical waveform at a selected tone frequency and a logic level start pulse for initiating the tone;
- and
- analog means responsive to the alternating logical waveform and the start pulse comprising:
- storage means responsive to the start pulse for storing a charge;
- and
- switching means connected to the storage means, responsive to the alternating logical waveform for repeatedly bleeding off charge from the storage means in synchronization with the alternating logical waveform;
- and
- transducer means connected to the storage means for producing the enveloped tone signal.
Apparatus for generating an enveloped tone signal comprising:
- storage means having an input terminal and responsive to a logical on signal at said input terminal for storing a charge and responsive to an alternating logical off and high impedance signal for producing an enveloped tone signal at said input terminal;
- and
- bilateral switch tone control means having a bilateral control output connected to said input terminal, a logic input terminal and a control terminal, responsive to a start signal applied to said logic input terminal and a sound signal applied to said control terminal for producing a logical on signal in response to said start signal and an alternating logical low and high impedance signal in response to said sound signal.
Combined analog and digital apparatus for generating an enveloped tone signal that minimizes the number of circuit connections between the analog and digital circuit sections, comprising:
- integrated circuit digital control means for generating logic level control signals including a frequency determining sound signal and a start signal and providing such signals to at most two output terminals;
- analog sound generating means having at most two input terminals connected to the digital control means via said at most two output terminals and comprising storage means responsive to the start signal for storing a charge and responsive to the sound signal for discharging to produce an enveloped signal at a frequency determined by the sound signal.
Dependencies are inferred from the claim text.