Signal generator
US4086588A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 12, 1975 |
| Grant date | Apr 25, 1978 |
| Priority date | — |
| Expiry date | May 12, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M11/20
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A signal generator generates different input signals when the keys are depressed. The signal generator comprises an input signal generating circuit and a double-key-depression detecting circuit. The input signal generating circuit includes a shift register having a plurality of shift stages and the associated output lines, signal lines for transmitting signals which may be sequentially derived from the output lines of the shift stages, and a discriminator for discriminating through which signalline is transmitted the signal. Each output of the shift stages of the shift register provides one information representative of a depressed key. Output of the discriminator provides another information representative of a depressed key. The input signal is identified by the combination of two kinds of the information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.