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An armor with rollers is provided that enables a user to move in all positions by rolling on a hard and smooth surface while constantly varying his bearing points on the ground.
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| Number | Title | Issue Date |
| 4475210 | Data eye monitor The data eye monitor includes a pair of comparators which compare the data input signal with a fixed reference voltage and a variable reference voltage with the resultant output of these two comparators being clocked into a digital comparator providing ne... | 10/02/1984 |
| 4449222 | Digital modulation quality monitor A quality monitoring technique and detector is provided for checking the accuracy of modulation performed by a digital transmitter. The monitoring is performed without using a full receiver nor otherwise fully demodulating the signal to recover the baseba... | 05/15/1984 |
| 4404630 | Data-extraction circuitry for PCM communication system Incoming and outgoing lines on opposite sides of a PCM coupling network, each carrying a recurrent frame with a multiplicity of 8-bit channels which are to be individually tested, have branches extending to an input-side data extractor and an output-side ... | 09/13/1983 |
| 4398299 | Data set network diagnostic system A voiceband data set network includes a control data set (10), a plurality of tributary data sets (4a, 4b . . . 4n) and a diagnostic control device (5). User-provided data is communicated between the control data set and the tributary data sets via a prim... | 08/09/1983 |
| 4398297 | Data set diagnostic system A voiceband data set network includes a control data set (10), a plurality of tributary data sets (4a, 4b . . . 4n) and a diagnostic control device (5). User-provided data is communicated between the control data set and the tributary data sets via a prim... | 08/09/1983 |
| 4393508 | System for locally testing a modem employing frequency shift keying A test system is used to test a modem whose modulator is constituted by a multivibrator which during normal operation produces two frequencies f1, f2 in response to the data signal and which is connected to a transmission filter. In ... | 07/12/1983 |
| 4387461 | Experientially determined signal quality measurement device for antipodal data In a data link conveying antipodal (two level) data bits, a signal quality measuring circuit using prestored experiential data acquired during a calibration phase. Any signal quality parameter, such as BER and Eb /No, can be measured... | 06/07/1983 |
| 4385384 | Modem diagnostic and control system A system for diagnosing and controlling operation of a plurality of modems, some located at a central site and others at various remote sites. A processor located at the central site selectively addresses microprocessor test and control units at each mode... | 05/24/1983 |
| 4385392 | Modem fault detector and corrector system A modem fault detector and corrector system including: a first modem including a first transmitter and first receiver and a second modem including a second transmitter and second receiver; switch means for selectively switching the first and second transm... | 05/24/1983 |
| 4385230 | Digital temperature effect generator A circuit for simulating the effects of a temperature change in a digital transmission medium. The circuit generates lengthened or shortened frequency pulses digitally by operating a pulse counter to reset early for a shortened pulse or skip a timing puls... | 05/24/1983 |
| 4377822 | Test equipment for a teletex television receiver This test equipment permits a testing of the demodulator of a teletex television receiver. It consists of a digital test signal generator, the output of which is connected to the HF input of the television, and a receiver, the input of which is connected ... | 03/22/1983 |
| 4373203 | Circuit arrangement and method for assessing communication activity on a particular radio communication channel A circuit for rapidly assessing communications activity on a particular radio channel being jammed has a filter tuned to the receiver IF and to the input of which the incoming signal (at the receiver IF) is switched. The waveform of the resultant filter o... | 02/08/1983 |
| 4361904 | Method of testing transceiver and transceiver including testing apparatus An ultra high frequency transceiver which transmits a modulated carrier wave and mixes a received signal with a locally generated signal to produce an intermediate frequency signal is tested by using the same transmitter as used during normal transceiver ... | 11/30/1982 |
| 4351059 | Method for testing a digital data transmission line between two modems and a device for the application of said method A method for testing a digital data transmission line connected between two modems, including the steps of transmitting a test message from the first modem to the second modem, comparing the received message with the standard test message to determine err... | 09/21/1982 |
| 4335361 | Variable gain amplifier A communications channel monitoring system is disclosed for digitally based communication channels carrying signals corrupted by noise. The monitor system provides a signal indicative of the expected value of the communication channel signal if uncorrupte... | 06/15/1982 |
| 4332029 | Automatic alignment system for a digital modem An automatic alignment system for use in a digital modem, having a performance indicator circuit associated therewith, adjusts the control voltages applied to selected alignment points therein in order to minimize the error indication output of the perfor... | 05/25/1982 |
| 4320881 | Fail-safe decoder for digital track circuits A selected unique digital comma-free code word is transmitted through track section rails from one end and, when received at the other end, is applied serially to a shift register which supplies a parallel readout of shifting pattern to one input of a fai... | 03/23/1982 |
| 4317206 | On line quality monitoring A system for on-line detection of distortion in a received digital signal which is phase modulated at a data rate fd and which has a suppressed carrier frequency fc and without interrupting the signal. The system comprises means for ... | 02/23/1982 |
| 4302843 | Method and apparatus for measuring transmission characteristics of a test object during communication gaps A method for measuring the transmission characteristics of a transmission line during gaps in communications on said transmission line consists of monitoring the transmission line for a gap in communication thereon, and applying an identifier signal follo... | 11/24/1981 |
| 4258436 | Multichannel RF signal generator A device for generating a plurality of RF signals, all possessing identical odulation characteristics. A clock source triggers an oscillator to produce a precise pulse train that is filtered and fed to a first double balanced mixer for mixing with the outp... | 03/24/1981 |
| 4247934 | Testing system for data transmission paths A loopback testing system for an asynchronously operating fully duplex data transmission path comprising proximate and remote stations, a proximate-to-remote data transmission channel for transmitting data to the remote station at a relatively high maximu... | 01/27/1981 |
| 4246608 | Method for measuring crossview between two channels in a wired television broadcasting system A method for measuring crossview between channels in a wired television broadcasting system is described in which a pseudo random binary pulse sequence signal is applied to a first channel, and the signal on a second channel is correlated with an identica... | 01/20/1981 |
| 4245320 | Method and device for measuring the slope of the envelope delay characteristic of a transmission channel and their application to an automatic equalizer selection technique A method and device for measuring the slope of the envelope delay characteristic in a transmission channel. The slope is determined from a received measurement signal having a frequency spectrum that includes three rays at frequencies fo, f | 01/13/1981 |
| 4197526 | Miniature pager receiver with digital display and memory A miniature receiver for a paging system having a digital display for displaying a received multi-digit number, and a memory for storing the received number to permit its retrieval and display at a later time. The received digital number may be automatica... | 04/08/1980 |
| 4194092 | Device for detecting a frequency in a PCM coded signal The invention relates to a device for digitally detecting a frequency in a PCM signal. In accordance with the invention, an up/down counter is provided which receives a up-count pulses when there is a change of sign in the signal to be checked and which r... | 03/18/1980 |
| 4143321 | Apparatus and process for grouping pulse signals according to source Signals in the form of pulses generated by a plurality of signal sources are received at two spaced receivers, and following initial filtering (if any), are stored, in chronological order of receipt, in memories associated with each receiver. Each pulse s... | 03/06/1979 |
| 4127816 | Carrier detect and automatic loopback circuit A master station communicates with remote stations by respective transmit-receive pairs. Quadra-phase modulation is utilized, involving a carrier having two characteristic frequencies not present during bursts of a communicated signal, which bursts are kn... | 11/28/1978 |
| 4119808 | Multi-frequency receiver circuits A receiver circuit for a multi-frequency telephone dialling system has means for validating a received tone by making successive measurements of the tone period and validating the tone when m of n successive measurements lie within a single one of a numbe... | 10/10/1978 |
| 4092599 | Annunciator communication system An annunciator communications system in which any one of a plurality of identical transmitting-receiving units can communicate to the rest through minimum communication links, such as power transmission lines, piping, building structures, or the like. Eac... | 05/30/1978 |
| 4055808 | Data communications network testing system A testing facility for a data communications network including modulators and demodulators, or modems, at central sites, at intermediate, or hubbing, sites, and at remote sites. Hubbing site testing units connect to respective host modems at the intermedi... | 10/25/1977 |
| 4042794 | Method and means for detecting an outgoing failure in a bidirectional communications span and looping the same in response thereto An automatic span line switch for PCM communication lines is disclosed which isolates alarm conditions to an actual span line failure, as distinguished from failures in the terminal equipment. In addition, the switch uses a specific code transmission to p... | 08/16/1977 |
| 4034340 | System for determining the quality of transmission of incoming digital message signals At a receiver for binary or other digital message signals, the incoming signals are fed in parallel to a first decision network with a relatively low threshold and a second decision network with a relatively high threshold, the latter being adjustable. Th... | 07/05/1977 |
| 3978449 | Method and apparatus for in-band signalling in data transmission An in-band signalling system for the transmission of both data and control signals through a common communications channel is disclosed. Unique means of distinguishing data bits from control bits is employed without the use of additional bandwidth over th... | 08/31/1976 |
| 3958244 | Transmitter output monitor A monitor for detecting faults in the output signals of a transmitter in which a selected modulation component of the signal is used to activate fault-detecting means. In the case of a DVOR beacon system, the sub-carrier frequency is filtered from the det... | 05/18/1976 |
| 3952163 | Method and apparatus for testing in FDM system A data communication system is described in which dial access control signals such as RING, DATA SET READY, DATA TERMINAL READY, CARRIER DETECT, and OUT OF SERVICE are transmitted between a central processing unit (CPU) and remote terminals in the form of... | 04/20/1976 |
| 3942098 | Apparatus for generating ungrounded voltages A circuit arrangement for facilitating the determination of a wire break in a line interconnecting a plurality of subscriber stations in a direct current, keyed data transmission system. Each subscriber station is equipped with a bridge circuit containing... | 03/02/1976 |
