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| Number | Title | Issue Date |
| 5517433 | Parallel digital data communications A method and apparatus for transmitting parallel digital data bit patterns over a single line is disclosed. Parallel digital data bit patterns are transformed into analog signals that are representative of the digital data bit patterns. Each digital data ... | 05/14/1996 |
| 5459749 | Multi-level superposed amplitude-modulated baseband signal processor A multi-level superposed amplitude-modulated baseband signal processor which has simple hardware structure and a filtering effect for bandwidth and power efficiency in a digital transmission system includes a data delayer, a signal level converter, an ope... | 10/17/1995 |
| 5339040 | AM demodulation receiver using digital signal processor An amplitude modulated (AM) radio receiver uses a digital signal processor, responsive to in-phase (I) and quadrature-phase (Q) component signals, to compensate for carrier energy removed by a capacitive coupling circuit. A quadrature mixer converts the r... | 08/16/1994 |
| 5339041 | High efficiency power amplifier A high-efficiency amplifier (10, 18) that may be used in, for example, a radar system to amplify signals received at an exciter (22) before they are applied to an antenna (20). The amplifier includes, among other components, an adaptive matching network (... | 08/16/1994 |
| 5025454 | Pulse to zero digital (PZ) modulation A "pulse to zero" modulation scheme is taught to transmit binary information by modulating a bit mark onto a carrier at the start of each "0" in the bit stream. The "pulse to zero" decoder produces an output that switches to "0" at the occurrence of the d... | 06/18/1991 |
| 5016246 | Digital telephone system circuits A telephone system uses above voice-band ASK control and supervisory signals which are appended to digitally encoded voice by forcing the least significant bits to a selected level for transmission to the receiving end. At the receiving end, the ASK is re... | 05/14/1991 |
| 4947407 | Sample-and-hold digital phase-locked loop for ask signals A digital phase-locked looped generates a clock signal synchronized with a carrier signal modulated by amplitude shift keying (ASK). During periods when no carrier signal is present, the generated clock signal coasts at the frequency of the carrier signal... | 08/07/1990 |
| 4857859 | AM digital demodulator An AM demodulator of a digital signal processing type wherein an analog AM signal is converted to a digital AM signal, the digital AM signal is squared and a one sample-delayed version of the digital AM signal is squared, these squared signals are added, ... | 08/15/1989 |
| 4540957 | Amplitude modulator forms two phase-shifted pulse trains and combines them A system and method for amplitude modulating a carrier signal with an audio or other information input signal relies on multivibrators and comparators initiating a logic controlled processing technique for providing two sinusoids, each a fundamental frequ... | 09/10/1985 |
| 4347619 | Digital formatting system An improved method and apparatus for transforming digital information into a special format similar to that of a standard color video signal. The special format includes a multi-level baseband component corresponding to the luminance component of a standa... | 08/31/1982 |
| 4346354 | Amplitude modulator using variable width rectangular pulse generator A method and apparatus for amplitude modulating a carrier signal with an audio or information input signal utilizes an arcsine generator to cause the envelope of the carrier to follow the input signal. The invention stems from the realization that if rect... | 08/24/1982 |
| 4205360 | Power line carrier apparatus Power line carrier apparatus of the on-off type, including a local transmitter and receiver coupled to a transmission line for communication with a remote station. An adjustable attenuator, located between the transmission line and the bandpass input filt... | 05/27/1980 |
| 4112368 | Constant amplitude carrier communications system A communication system comprising one or more communication units (transceivers) in which the transmitter includes means for modulating the carrier wave in such manner that the carrier amplitude is not varied by signal information but nevertheless signal ... | 09/05/1978 |
| 4056828 | Run length encoding and decoding methods and means Black and white run length encoding means first convert a binary video input signal having a raster scan format into binary black and white run length message codes which are preselected so that the initial or lead bit of each of those codes is at a given... | 11/01/1977 |
