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| Number | Title | Issue Date |
| 4380068 | Test unit for a high-rate multitrack digital recorder The unit for testing a plurality of tracks of a high-speed recorder in parallel comprises an emission subassembly for the transmission of data to the recorder to be tested and a test subassembly. The emission subassembly mainly comprises a generator for p... | 04/12/1983 |
| 4380067 | Error control in a hierarchical system A hierarchical communication system has multipaths for different levels of the heirarchy, each set of paths is assigned a criticalness to the successful operation of the system. Error rates for all of the paths are monitored. A threshold for defining an u... | 04/12/1983 |
| 4339657 | Error logging for automatic apparatus Method and apparatus for improved error logging by integrating errors over a given number of operations that provides long memory and fast recovery. Errors integrated over a selected number of associated operations are compared to a criterion. An exceptio... | 07/13/1982 |
| 4300233 | Noise assessment of PCM regenerators Instruments are disclosed for testing the susceptibility of PCM regenerators to rear end and far end crosstalk noise. The instruments of the invention are more compatible with PCM system engineering rules since certain important PCM system parameters are ... | 11/10/1981 |
| 4296495 | Device for measuring the quality of a digital radio link The device determines the error rate by the periodic evaluation of the parity of a pre-determined number of bits, the synchronism of said evaluation at transmission and reception being ensured by the recognition of a predetermined sequence in the binary i... | 10/20/1981 |
| 4291403 | Digital implementation of parity monitor and alarm A digital bit error violation rate circuit monitors the bit error integrity of a data stream and generates an alarm if the bit error rate exceeds an established bit error integrity threshold.... | 09/22/1981 |
| 4241445 | Method and apparatus for counting transmission errors in a digital microwave link A method of counting transmission errors in a digital microwave link with a demand of commutation onto an emergency channel when the quality of the link becomes deficient, wherein the errors are counted during a period t which is always at least equal to ... | 12/23/1980 |
| 4238779 | Data transmission and reception system A full duplex data modem for general application, e.g., cable system signal distribution, terrestrial or satellite radio link, or the like includes transmit and receive portions for permitting reliable communications between plural stations coupled to the... | 12/09/1980 |
| 4234954 | On-line bit error rate estimator This on-line circuit estimates the bit error rate (BER) of a binary data signal stream in the presence of noise uncorrelated with the signal. For a binary data signal having two states, e.g., plus V and minus V biased around a specified reference level (R... | 11/18/1980 |
| 4216541 | Error repairing method and apparatus for bubble memories An error repairing method and apparatus for a magnetic bubble memory for restoring stored binary data to its original form are described. The method and apparatus are employed to compensate for random error in bubble memories resulting from slipped or dis... | 08/05/1980 |
| 4200838 | Apparatus for evaluating the error rate of binary digital signals Apparatus for evaluating the error rate of a binary digital signal transmitted according to a multiple level modulation process in which a received signal is connected to a main and an auxiliary demodulator in parallel, the auxiliary modulator including m... | 04/29/1980 |
| 4122358 | Supervisory system for a data transmission system In a data-transmission route involving parallel (e.g. 8Mb/s) data-transmission systems each using a separate line pair, a common line pair, linking all terminal and repeater stations, is used for supervisory and control purposes (signals up to say 25 KHz)... | 10/24/1978 |
| 4097697 | Digital signal performance monitor A performance monitor for determining the error density of a digitally transmitted signal in which the magnitude of a d-c offset voltage applied to one regenerator is controlled in a feedback loop so as to maintain a constant error rate between the output... | 06/27/1978 |
| 4093940 | System and equipment for quality checking of a digital connection circuit A system for quality checking of a digital connection circuit using a telephone line. Its principle resides in alternately and repetitively transmitting a check message followed by a quality character from one to the other of two similar equipments respec... | 06/06/1978 |
| 4091239 | Bit error rate performance monitor units in digital transmission links A bit error performance monitor in which the input signal is equally shared by two substantially identical monitors whose outputs in turn are connected to an adder. The output of the adder passes through a divider-by-2 to a counter.... | 05/23/1978 |
| 4080589 | Error density detector An initial error indicated by a pulse at the binary input is applied through a gating circuit to trigger a monostable multivibrator (one-shot) to start a timing interval. The output of the one-shot is applied to a second gating circuit which inhibits the ... | 03/21/1978 |
| 4069970 | Data access circuit for a memory array A memory array, having a plurality of intersecting rows and columns, stores digitized speech. Each row and column intersection consists of a binary storage cell for storing one bit of digitized speech. Incoming digitized speech is loaded into columns of t... | 01/24/1978 |
| 4070647 | Error measurement for digital systems The quality of a transmission link is demonstrated by the number of samples of predetermined bit length (N) containing more than one bit in error. The distribution of errors, as it is called is determined by detecting the occurrence of an error, counting ... | 01/24/1978 |
| 3999051 | Error logging in semiconductor storage units A maintenance procedure comprising a method of and an apparatus for storing information identifying the location of one or more defective bits, i.e., a defective memory element, a defective storage device or a failure, in a single-error-correcting semicon... | 12/21/1976 |
| 3990009 | Method and apparatus for uniquely encoding channels in a digital transmission system In a digital transmission system of the type which employs cross-polarized radio channels, the failure of a transmitter associated with a particular channel can cause an undesired signal cross-over into the receiver of the failed channel. According to the... | 11/02/1976 |
| 3934224 | Apparatus for continuous assessment of data transmission accuracy in a communication system A method and apparatus are disclosed for monitoring the accuracy of electronic data transmitted over a communication channel or telemetry link. Data is monitored at the transmitting point and also at the receiving point. Data monitored at the receiving po... | 01/20/1976 |
