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4357702 |
Error correcting apparatus
A multiple track tape recording system as disclosed in which the data recorded in each track is coded to allow for error correction and skew correction. The skew correction is done with a code...
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RE31056 |
Computer controlled high-speed circuit for testing electronic devices
High-speed testing circuitry which, when coupled to one terminal of a multi-terminal electronic device, such as an integrated circuit, can either supply test stimuli signals up to a frequency of 30...
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4330846 |
Digital time base correction
The present invention provides apparatus for adjusting the time base of a signal that is read out from an addressable memory device. In accordance with a disclosed embodiment, coarse time base...
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4139147 |
Asynchronous digital circuit testing and diagnosing system
Improved means and methods are described for continuously and asynchronously testing and diagnosing the operation of a digital circuit or unit. A predetermined plurality of test signal segments are...
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4122995 |
Asynchronous digital circuit testing system
Improved means and methods are described for continuously and asynchronously testing the operation of a digital circuit or unit. The testing approach is based on determining whether an output...
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4115759 |
Multiple bit deskew buffer
A multiple bit deskew buffer while providing skew correction for multi-track data read on mass storage devices is disclosed. All data transfers are synchronized to one basic clock eliminating the...
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4092589 |
High-speed testing circuit
High-speed testing circuitry which, when coupled to one terminal of a multi-terminal electronic device, such as an integrated circuit, can either supply test stimuli signals up to a frequency of 30...
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4044329 |
Variable cyclic redundancy character detector
The invention disclosed reduces unrecoverable read errors from a magnetic tape resulting from the apparent lack of a cyclic check character (CCC), sometimes referred to as a cyclic redundancy check...
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4024498 |
Apparatus for dead track recovery
In one exemplary embodiment, an improved apparatus for recovery of a dead track in NRZI tape data format having parallel transmission of data bits is provided in which a dead track recoverer...
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3976940 |
Testing circuit
An improved testing circuit is provided which includes a pair of comparator circuits each of which is disposed for comparing two minimum threshold amplitudes of responses from a device under test,...
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3949193 |
Credit card reader having two magnetic readout heads
A credit card reader is described which includes two magnetic readout heads whose gaps are spaced from each other a distance equal to one half the distance between adjacent, uniformly spaced bits...
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3927392 |
Conditional skew compensation arrangement
An arrangement is disclosed for conditionally compensating for skewing in the reception of data words transmitted over duplicated data transmission links. Each data word is serially transmitted...
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3882459 |
Deadtracking system
A microprogrammed peripheral controller includes a deskew buffer including a plurality of clocked storage devices. Pairs of the clock storage devices of each register provides storage for a single...
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3843952 |
METHOD AND DEVICE FOR MEASURING THE RELATIVE DISPLACEMENT BETWEEN BINARY SIGNALS CORRESPONDING TO INFORMATION RECORDED ON THE DIFFERENT TRACKS OF A KINEMATIC MAGNETIC STORAGE DEVICE
The relative displacement between the binary signals on a reference track and the binary signals on each of the other tracks of a magnetic recording system is measured by carrying out on each set...
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3803552 |
ERROR DETECTION AND CORRECTION APPARATUS FOR USE IN A MAGNETIC TAPE SYSTEM
A deskewing buffer system includes a plurality of storage registers, each of which include a plurality of storage devices. Pairs of storage devices of each register provide storage for a single...
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3800280 |
TIME SKEW MEASUREMENT CIRCUIT FOR MAG TAPE TRANSPORTS
A skew measurement circuit for determining the skew characteristics (i.e., the minimum, maximum and average skew) of a magnetic tape transport system is disclosed. The circuit includes an...
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3792436 |
DESKEWING BUFFER ARRANGEMENT WHICH INCLUDES MEANS FOR DETECTING AND CORRECTING CHANNEL ERRORS
A deskewing buffer system includes a plurality of storage registers each of which include a plurality of storage devices. Pairs of the storage devices provide storage for a single information...
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3790954 |
SKEW CONTROLLED READBACK SYSTEMS
Marginal skew in a readback system of a digital multitrack magnetic signal recorder selectively actuates a gating system for selectively passing control signals for effecting control functions in...
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3778787 |
READBACK SYSTEMS FOR DIGITAL RECORDERS
A digital magnetic recorder uses up to twice the Nyquist bandwidth of a data signal, plus a clock signal at a frequency exactly equal to the bit rate for reliably exchanging data signals with a...
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3745310 |
MAGNETIC TAPE READ-OUT SYSTEM
Chronometric controls are provided for detecting the occurrence of predetermined conditions of appearances of significant pulses in any character read out from the magnetic tape and for so...
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3737853 |
APPARATUS FOR SENSING AND PROCESSING MISSING OR ERRONEOUSLY RECORDED INFORMATION
Apparatus for sensing and processing missing or erroneously recorded phase encoded binary information recorded upon a plurality of tracks of a suitable information storage medium such as a magnetic...
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3728679 |
SKEW DEVICE
A device for correcting the time relationship of parallel data bits to eliminate the effect of certain forms of static skew. The apparatus accepts the data bits on parallel channels, one of which...
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3708783 |
INTERCHANNEL TIME DISPLACEMENT CORRECTION METHOD AND APPARATUS
Associated digital data in a plurality of parallel data channels and a unique digital sync word successively repeated in one more parallel channel are exchanged without a change in data clock so...
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3633187 |
METHOD AND APPARATUS FOR CERTIFYING MAGNETIC RECORDING TAPE
A digital tape certifier method and apparatus is disclosed wherein certification digit signals are recorded on the tape at desired density for certification, the signals read and the tape stopped...
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3530384 |
PLURAL-INPUT DROPOUT AND NOISE DETECTION CIRCUIT FOR MAGNETIC RECORDING TAPE
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3528017 |
PLURAL-INPUT,DROPOUT-INSENSITIVE SKEWMEASURING CIRCUIT FOR MAGNETIC RECORDING TAPE
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3518625 |
DEAD TRACK HANDLING
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3517305 |
MAGNETIC TAPE TESTER IN WHICH,AFTER COMPARISON WITH A STANDARD,AN ERRONEOUS SIGNAL IS STORED FOR LATER ANALYSIS
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3509531 |
SIGNAL ALIGNMENT SYSTEM
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3508231 |
TEST TAPE WITH PRESELECTED SKEW
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3456237 |
DESKEWING SYSTEM
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3325794 |
Skew correction system
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3281805 |
Skew elimination system utilizing a plurality of buffer shift registers
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3262097 |
Dead track handling
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3239809 |
Skew correction buffer
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3230350 |
Skew compensating system
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3199094 |
Plural channel recording system
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3193812 |
Missing bit detector on recorded storage media
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