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"Rail travel at high speeds is not possible because passengers, unable to breathe, would die of asphyxia."
Dionysius Lardner, Professor of Natural Philosophy and Astronomy at University College, London ; 1830
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| Number | Title | Issue Date |
| 4691236 | Receiver device in a satellite communication system A receiver device for a satellite communication system capable of transmitting in either of two modes detects which transmission mode is currently in effect and adjusts its signal processing and output stages accordingly. The transmission may be recognize... | 09/01/1987 |
| 4635099 | Apparatus for detecting nonstandard video signals Circuitry for detecting nonstandard video signals is disclosed. This circuitry is used in a sampled data video signal processing system to control signal processing steps which utilize a frame store memory. The detecting circuitry includes a programmable ... | 01/06/1987 |
| 4561021 | Frequency determining apparatus A frequency determining apparatus discriminates between two different frame frequencies in television signals. A binary counter (4) makes a 1/64 frequency division of a horizontal synchronizing signal outputted from a horizontal synchronizing signal produ... | 12/24/1985 |
| 4509072 | Digital circuit for providing a binary signal on the occurrence of a predetermined frequency ratio of two signals The invention provides a digital circuit for generating a binary signal output when a predetermined frequency ratio, v=f1/f2, of two signals F1 and F2 occurs during a selected measuring period. The circuit is particularly adapted for use in a color televi... | 04/02/1985 |
| 4504862 | Digital circuit for generating a binary signal on the occurrence of a given frequency ratio of two signals To generate a binary signal on the occurrence of a given frequency ratio of two signals, the higher-frequency, first signal is applied to the count input of a first up-counter whose maximum count is greater than the frequency ratio. The attainment of a co... | 03/12/1985 |
| 4454531 | Digital circuit for providing a binary signal on the occurrence of a predetermined frequency ratio of two signals The invention provides a digital circuit for generating a binary signal output when a predetermined frequency ratio, v=f1/f2, of two signals F1 and F2 occurs during a selected measuring period. The circuit is particularly adapted for use in a color televi... | 06/12/1984 |
| 4414571 | Television receiver A television receiver converts a television signal of a standard television system currently employed into a signal at a horizontal scanning frequency of n (an integer of 2 or more) times that of the original television signal, so that it can visually rep... | 11/08/1983 |
| 4414563 | Television receiver circuit arrangement for identifying the standard In a television receiver circuit arrangement for several standards, the identification circuits are switched on one after the other by a test cycle actuating signal which is maintained when the standard has been identified.... | 11/08/1983 |
| 4408222 | Phase detector for television tuning systems and the like A phase detector suitable for use in an identification circuitry of a PAL/SECAM Television Receiver or the like for identifying the line sequence, wherein the input of the phase detector is adapted to receive the differential output signals from a frequen... | 10/04/1983 |
| 4240102 | Identification system for SECAM or SECAM/PAL color television receivers In a receiver subject to SECAM signal reception, an FM detector responsive to the received signals has its center frequency tuning switched between one SECAM subcarrier center frequency and the other SECAM subcarrier center frequency. Control of the switc... | 12/16/1980 |
