| Noise pulse interruption of synchronizing signal separator |
348/533 |
A synchronizing circuit that improved reception at the fringes of a television station's broadcast area. |
Robert Adler; Northfield &Meyer Marks |
Zenith Radio Corporation, Illinois |
November 26, 1957 |
US2,814,671 |
| Control System |
367/199 |
Television Remote Control. While not the first remote control, its underlying technology was a vast improvement over previous remote control systems. It was mechanical and used ultrasound waves, above the range of human hearing, to change the channel and volume. When the user pushed a button on the remote control, it clicked and struck a bar, hence the term "clicker". Each bar emitted a different frequency and circuits in the television detected this sound tones as “channel-up,” “channel-down,” “sound on/off,” or “power on/off.” |
Robert Adler |
Zenith Radio Corporation, Illinois |
December 17, 1957 |
US2817025 |
