Quotables
"That the automobile has practically reached the limit of its development is suggested by the fact that during the past year no improvements of a radical nature have been introduced."
Scientific American ; Jan. 2 edition, 1909
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| Number | Title | Issue Date |
| 5073975 | Stop on station circuit including center channel detector A Stop On Station (SOS) circuit for a AM and FM radio receivers evaluates field strength of a received station signal and in addition measures and evaluates the frequency of the IF signal so as to assure that the received signal is essentially centered at... | 12/17/1991 |
| 5070537 | System for detecting defective point on power transmission line by utilizing satellite The invention relates to a system for detecting any defective point on a power transmission line by making use of highly-accurate time signal transmitted from a satellite and by utilizing a digital data processing system. The system comprises a master sta... | 12/03/1991 |
| 5068918 | Receiver for terrestrial AM and satellite FM-TV broadcasting signals A receiver for terrestrial AM-HF-TV signals and satellite FM-HF-TV signals in first and second frequency ranges, respectively, of mutually predominantly equal widths, which succeed each other in frequency, includes, arranged one after the other, a HF-AM-F... | 11/26/1991 |
| 5065450 | Frequency modulated radio frequency broadcast network employing a synchronous frequency modulated booster system A frequency modulated radio frequency broadcast network in which re-transmitting stations employ a synchronous frequency modulated booster system. Included in the frequency modulated booster system is a synchronous frequency modulated exciter for converti... | 11/12/1991 |
| 5065452 | Digital traffic news evaluation method In a method for evaluating traffic announcements received in digitally encoded form in a data packet, the data packet is decoded, and after the evaluation the traffic announcements are stored in memory. Under poor broadcasting conditions, it may be uncert... | 11/12/1991 |
| 5065453 | Electrically-tunable bandpass filter A bandpass filter is disclosed which may be used in a superheterodyne receiver in front of the first mixer. The bandpass filter provides a narrow front end filter which is tuned automatically as the local oscillator frequency is changed. In the present ex... | 11/12/1991 |
| 5065235 | CATV terminal unit including memory for storing remote control codes relating to an external apparatus A CATV terminal, which has a timer function capable of supplying power to the CATV terminal at a user-programmed time, tuning-in to a user-programmed channel, and stopping the supply of power at a user-programmed time, is used to control an external appar... | 11/12/1991 |
| 5060294 | Dual mode power amplifier for radiotelephone A dual mode power amplifier operable in etiher the linear mode or the saturation mode. The power amplifier, when comprising a portion of a radio transmitter, permits efficient amplification of either a frequency modulated or a composite modulated signal b... | 10/22/1991 |
| 5060299 | Radio frequency mixer circuit utilizing interface transformers and switching diodes A diode mixer characterized by low levels of intermodulation distortion. The mixer circuit includes a center-tapped input transformer for coupling the circuit to local oscillator and radio frequency signal sources and a center-tapped output transformer fo... | 10/22/1991 |
| 5058199 | Inter-truncked radio systems bridge protocol A radio signal relay system for use with dispatch communication systems is disclosed. The radio signal relay system includes a linking device constructed with a first and a second full duplex transceivers such that it has the capability of communicating w... | 10/15/1991 |
| 5058198 | Radio frequency tap unit which can be reconfigured with minimal disruption of service A modular cable television tap unit includes a base module which receives a cable television signal having an operational power signal component from a cable distribution network. The base unit includes circuitry for separating radio frequency (RF) compon... | 10/15/1991 |
| 5058200 | Transmitter location searching system A transmitter location searching system produces fast, stable and accurate results in a multipath transmission environment by geometrically partitioning the monitored area into a plurality of cells and finding the optima of a total cost function at the ce... | 10/15/1991 |
| 5054118 | Balanced mixer utilizing filters A mixer circuit has a first filter connected between a local oscillator terminal and a node and another filter connected between a RF signal terminal and the node. A first circuit path extends from the node through a first diode to a first tuned circuit w... | 10/01/1991 |
| 5054116 | Feed-forward automatic level control circuit for a high-frequency source In a feedback loop level control circuit for an RF source, the RF output is sensed and compared to a reference level which determines the desired output power level. The difference between the output sample and the reference level constitutes an error sig... | 10/01/1991 |
| 5052027 | Programmable noise bandwidth reduction by means of digital averaging Predetection noise bandwidth reduction is effected by a pre-averager capable of digitally averaging the samples of an input data signal over a single symbol, the averaging interval being defined by the input sampling rate divided by the output sampling ra... | 09/24/1991 |
| 5052050 | Direct conversion FM receiver A direct conversion receiver for demodulating an FM signal converted frequency down converts the signal to quadrature related baseband signals (I,Q). These signals are applied by way of respective d.c. blocking capacitors (16, 18) and differentiating circ... | 09/24/1991 |
| 5050236 | Radio frequency field strength enhancer A radio frequency field strength enhancement system (402) having a member (404) with at least one tuning impedance (405) for adjusting a desired frequency response associated with the member (404) and means for retaining (408) the member (404) in close pr... | 09/17/1991 |
| 5050234 | Method for connecting a channel between a base station and a mobile station A radio communication system comprises a plurality of subsystems each including a base station and a mobile station. A connection is to be allowed between the base and mobile stations in a subsystem by a first decision, when they have a first distance sho... | 09/17/1991 |
| 5046127 | Transmission path tester for broadcasting A warning broadcast system features control signal means, preferably digital, for confirming transmission path integrity prior to broadcast of a spoken warning message. A radio receiver (1) in an alarm center has an auxiliary carrier reception stage (4) w... | 09/03/1991 |
| 5046129 | Reducing phase error in received FM multiplex signal A receiver for receiving a transmitted signal comprising first and second bandwidth limited component signals modulating a single high frequency carrier in phase quadrature with the first component signal as originally transmitted including an identificat... | 09/03/1991 |
| 5046124 | Frequency modulated radio frequency broadcast network employing a synchronous frequency modulated booster system A frequency modulated radio frequency broadcast network in which re-transmitting stations employ a synchronous frequency modulated booster system. Included in the frequency modulated booster system is a synchronous frequency modualted exciter for converti... | 09/03/1991 |
| 5038404 | Low phase noise agile up converter The converter has two mixer stages each including a phase locked loop with an oscillator controlled by a phase comparator. The frequency reference to both stages is provided by a single master reference. The frequency of the oscillator in the first stage ... | 08/06/1991 |
| 5038399 | Method for assigning channel reuse levels in a multi-level cellular system In a radio frequency communication system employing channelization, such as a cellular TDMA system, and having a plurality of reuse channel levels, such as multiple frequency reuse patterns, each level having at least one associated reuse channel, a metho... | 08/06/1991 |
| 5038401 | Transmitter for remote control with operation switches having changeably displayed forms In the transmitter for remote control, a frequency at which an individual key switch is operated is counted, and a display formation of operation contents corresponding to the individual key switches is changed in accordance with the frequency. The change... | 08/06/1991 |
| 5033110 | Frequency converter for a radio communications system A frequency converter for a transmitter of a microwave radio communications system comprises an image reject mixer for mixing an IF signal with an LO or carrier frequency signal to produce an RF signal, and a nulling circuit for providing d.c. offsets to ... | 07/16/1991 |
| 5029236 | Radiotelephone apparatus A radiotelephone apparatus employed as a so-called portable telephone or a car telephone includes an outer casing, a chassis base plate provided in the outer casing and mounting an electronic circuit section containing above all a heated element or elemen... | 07/02/1991 |
| 5027428 | Power saving arrangement and power saving method A power saving arrangement for use in a handset unit which communicates with a base unit in response to the detection of an ID signal leading data signal, which are produced from the base unit, includes a processing circuit for receiving and processing th... | 06/25/1991 |
| 5020143 | Vehicular radio receiver with stored detour data In a vehicular radio receiver having a decoder for decoding digitally encoded received traffic announcements, a memory device for route-specific characteristics and a visual and/or acoustical output device for the traffic announcements are provided. The o... | 05/28/1991 |
| 5020138 | Radio communication apparatus having cooling means A radio communication apparatus has a modulating portion for modulating a carrier with a signal to be transmitting so as to produce a transmission signal. A signal transmitting portion causes the transmissible signal to be subjected to power amplification... | 05/28/1991 |
| 5020129 | Addressable control system for CATV program distribution Remote control of subscriber access to premium programs on a cable television system or the like is provided. A signal path carriers program signals received from a cable television system. A switchable port coupled to the signal path is identified by a l... | 05/28/1991 |
| 5010585 | Digital data and analog radio frequency transmitter A digital Non Return to Zero (NRZ) and Frequency Modulated (FM) radio transmitter intended but not unique to, for the transmission of Digital, Tone Only or Tone and Voice paging messages is described. This transmitter is built on the concept that the sepa... | 04/23/1991 |
| 5001779 | Mounting arrangement for motorcycle stereo system A package and a method for making the package for mounting a sound system on a motorcycle, which is easily attached and detached from the motorcycle is disclosed. The components of the sound system are generally surrounded by a cushioning filler and enclo... | 03/19/1991 |
| 4995095 | Method and apparatus for utilizing unpresented communication groups In a communication system that comprises a plurality of communication resources, a plurality of consoles, a communication resource allocator, and a plurality of subscriber units arranged into a plurality of communication groups, the communication resource... | 02/19/1991 |
