| 20090323923 | CONTROLLER USING DUAL-TONE MULTI-FREQUENCY (DTMF) TONES - A method and device for converting signals from a Human-Interface Device or similar input device to a stream of digital signals that are useable as inputs to an RS-232 or dual-tone multi-frequency (DTMF) circuit is provided. More specifically, the input from the input device may be received at a universal Serial Bus (USB) host and converted to an RS-232 or DTMF signal for ultimate use in controlling a remote device such as a camera in a video security system. | 12-31-2009 |
