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| Number | Title | Issue Date |
| 7373565 | Start/stop circuit for performance counter A circuit for tracking a number of clock cycles between occurrences of an event of interest. The circuit includes logic for asserting a run signal responsive to a first occurrence of the event of interest, logic for deasserting the run signal responsive to a second ... | 05/13/2008 |
| 7342984 | Counting clock cycles over the duration of a first character and using a remainder value to determine when to sample a bit of a second character In an auto baud system and method, the baud rates between two communicating devices are synchronized by timing the transmission of a plurality of bits by counting the cycles of a reference clock. The number of cycles counted is then divided by the number of bits cou... | 03/11/2008 |
| 7184408 | Method and apparatus for programmable generation of traffic streams Methods and apparatus provide single or multi-port, flexible, cost-effective, built-in self-test capabilities for network communications equipment, such as for example switches, and programmably generate, and subsequently analyze, one or more sequences of test packe... | 02/27/2007 |
| 5018685 | Data link and return link This invention relates to a data coder, code searching mechanism, data deer, and range computer for a missile wherein the missile receiver is able to discriminate between the real signals and jamming signals. The system provides discrimination in aircraf... | 05/28/1991 |
| 4581639 | Method and apparatus for monitoring suitability of a transmission path for transmission of digital data signals The suitability of a transmission path (16 or 18) for transmission of digital data is monitored by transmitting a test signal over the transmission path. The test signal is composed of a succession of video signal lines each including a horizontal sync pu... | 04/08/1986 |
| 4300024 | Technique for measuring a duration of signaling pulses in a telephone circuit A measurement method and apparatus for determining the duration of a current signaling pulse in a telephone circuit, without breaking or interrupting the circuit, through observing a voltage waveform across the circuit, even though the voltage waveform is... | 11/10/1981 |
| 4255623 | Apparatus for pulse train measurement An incoming pulse train is evaluated for interpulse spacing and pulse repetition rate by first shaping the pulses into a desired configuration in a dial pulse shaper (12). The shaped pulses are applied to a pulse counter and controller (14) to generate nu... | 03/10/1981 |
| 4209662 | Circuit arrangement for scanning the character elements of characters at arbitrarily determinable points, in particular for the correction of teletypewriter characters A circuit arrangement for scanning the character elements of characters, respectively occurring within a prescribed duration, at arbitrarily determinable points, in particular for the correction of teletypewriter characters by means of scanning the indivi... | 06/24/1980 |
| 4187438 | Circuit arrangement for unilaterally scanning distorted teletype characters A circuit for unilaterally scanning teletype characters wherein the characters are supplied to an integrating circuit and to an impulse circuit wherein the impulse circuit can be controlled by the step changes of a character. A comparator circuit receives... | 02/05/1980 |
| 4161628 | Technique for tracking amplitude fades for multi-amplitude signalling Amplitude variations in a multi-amplitude transmission system are tracked by monitoring amplitude variations over a substantial data time span through the use of a technique in which the percentage of time that a maximum-valued reference amplitude is exce... | 07/17/1979 |
| 4053723 | Method and apparatus for measuring the bit error frequency in a cable caused by crosstalk between line pairs during transmission of a 3-level coded PCM signal A method and an apparatus for measuring the bit error frequency in a cable caused by crosstalk from at least one disturbing pair to a disturbed pair at transmission of a 3-level coded PCM signal utilizes the fact that a PCM signal transferred on a pair an... | 10/11/1977 |
| 4009341 | Device for regenerating telegraphic signals A device for regenerating telegraphic signals without bias distortion and noise, using, essentially, a peak limiter fed with direct current voltage from the input signal and a comparator comparing the output signal leaving the peak limiter with a decision... | 02/22/1977 |
| 4006303 | Filtered transition distortion channel quality monitor A system for measurement of teletype or other communication channel quality herein the bit signal element duration is divided into m subintervals. A plurality of transition counters are provided such that each transition counter counts the number of DC tra... | 02/01/1977 |
| 3992581 | Phase locked loop NRZ data repeater A phase locked loop repeater for reshaping a non-return to zero (NRZ) data stream. A transition detector receives the input data stream from a coaxial cable in a degraded condition in terms of amplitude and phase distortion and produces reference pulses w... | 11/16/1976 |
| 3985955 | Apparatus for measuring the distortion of data signals Apparatus is described for measuring distortion appearing on data signals. This apparatus is of the type which uses a counter that, responsive to a pulse train of constant repetition frequency, counts from an initial to a final value during each segment o... | 10/12/1976 |
| 3978282 | Apparatus and method for measuring the transmission characteristics of a network A substantially non-interfering, low-intensity sweeping test signal is transmitted along a network to be tested. Means are provided for receiving and tracking the test signal at the opposite end of the network. A reference signal is transmitted along with... | 08/31/1976 |
| 3978283 | Switching arrangement for receiving DC signals A circuit arrangement for facilitating reception of direct current signals in telegraph or data transmission systems is described. A threshold circuit is disposed in the receive line; the threshold circuit has two threshold values, one of which is close i... | 08/31/1976 |
| 3970944 | Pulse suppressing circuit arrangements and equipment incorporating the same A pulse suppression circuit arrangement, suitable for use in a data transmission system, for suppressing, in dependence on the length thereof, noise disturbance or other undesired signal pulses of lengths outside a range of lengths in which useful signal ... | 07/20/1976 |
| 3965293 | Circuit arrangement for varying the phase of a reference signal in transmission path distortion measuring apparatus For use in connection with apparatus for determining the distortion characteristic of a data transmission path, a circuit arrangement is described for varying the phase of a reference signal against which the transmitted signal is compared in the receiver... | 06/22/1976 |
| 3965294 | Method of and apparatus for testing transmission line carrying bipolar PCM signals To check the bit-distortion ratio of a transmission line carrying bipolar PCM signals, converted from a binary to a balanced ternary code at the tramsmitting end and reconverted into binary signals at the receiving end, binary test words and identical ref... | 06/22/1976 |
