Dual-mode waveform generator
US4000489A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 6, 1975 |
| Grant date | Dec 28, 1976 |
| Priority date | — |
| Expiry date | Jun 6, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D3/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The disclosed circuit provides a signal generator which is particularly adapted for use as an audible "kilo-sonic" game device in which a plurality of switches are provided so that the different combinations of switch positions produce a corresponding number of different sounds. The circuit includes a voltage-controlled-oscillator (VCO) having an output coupled to a transducer such as a speaker. The VCO is modulated in accordance with a control signal, provided by an up-down staircase generator which is responsive to a pulse generator, to vary the frequency of its output signal. The output of the pulse generator is also selectively coupled with the output of the staircase generator. Time-constant circuits in each of the generators are respectively under the control of selected ones of the switches; and two basic modes of operation are provided by the selected switches so that the control signal at the VCO input is either a pseudo random signal, or a synchronized sub-multiple signal wherein the frequency of the staircase generator output signal is a sub-multiple of the pulse generator output signal. Accordingly, the number of different output sounds provided by the disclosed circuit…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.