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| Number | Title | Issue Date |
| 4218612 | Magnetic signal detector A circuit is disclosed for monitoring the output voltage of a magnetic pickup and for producing output signals representing the valid detection of bars of magnetized ink moved past the pickup. The circuit is capable of detecting and providing correct outp... | 08/19/1980 |
| 4214280 | Method and apparatus for recording data without recording on defective areas of a data recording medium A method of transferring data between a data supply and a disk having a track divided into sectors, each sector having an address recording area followed by a data recording area. The method includes detecting a defective area on a data recording area; wr... | 07/22/1980 |
| 4211997 | Method and apparatus employing an improved format for recording and reproducing digital audio An audio signal is sampled, quantized and the values are stored in a specific digital data block/sub-block format on alternate tracks of a recording medium. The block/sub-block format provides an inherent simplification of error correction techniques, and... | 07/08/1980 |
| 4209809 | Apparatus and method for record reorientation following error detection in a data storage subsystem In an apparatus and method for record reorientation following error detection in a data storage subsystem each data track is subdivided into equal time-length recording cells which are sequentially numbered past an index point with the beginning of each f... | 06/24/1980 |
| 4203137 | Dual mode read preamplifier with electrical short detector Monitoring the performance of recording channels during the write mode is accomplished by available read preamplifier circuitry, and a write monitor channel. During the read mode, the read preamplifier functions conventionally. During the write mode, the ... | 05/13/1980 |
| 4202018 | Apparatus and method for providing error recognition and correction of recorded digital information The present invention involves apparatus and techniques for converting analog data, preferably audio signals, to digital information, which digital information is preferably recorded from two separate main channels onto main tracks and includes a third or... | 05/06/1980 |
| 4176380 | Adaptive speed/interblock gap control for tape drive Apparatus and method for controlling a reel-to-reel tape drive so that its performance characteristics are optimized to best suit the operational mode or availability of a host system by modifying tape speed adaptively according to predetermined condition... | 11/27/1979 |
| 4081756 | Dual channel signal detector circuit A dual channel signal detector circuit comprising an equalizer for responding to a variable peak amplitude input signal, in which the peaks are representative of data, so as to provide a substantially constant peak amplitude output signal having discrete ... | 03/28/1978 |
| 4027141 | Apparatus for encoding a magnetic label An apparatus for encoding a magnetic recording medium in the form of discrete labels such as may be removably adhered to a carrier web includes a mechanism for transporting the medium past a magnetic record and playback head. As the tape passes the playba... | 05/31/1977 |
| 4017895 | Method of detecting defects in read out signals, and apparatus for implementing the same The present invention relates to a method and apparatus for detecting defects in signals produced by the read-out of information recorded upon a data carrier. The defects correspond either to an abnormally high frequency or to an abnormally low frequency.... | 04/12/1977 |
| 4016599 | Anti-shouldering read circuit for magnetic disk memory During the reading of certain combinations of bits from a magnetic disk memory surface, wider than normal separations may occur between positive and negative peaks. In order to eliminate false peak readings to be decoded by the decoding circuitry, a delay... | 04/05/1977 |
| 4006455 | Error correction system in a programmable calculator An error correction system is particularly suitable for user programmable calculators which may be programmed to perform a series of functions on data entries by means of a series of program steps entered into the calculator from a storage media such as r... | 02/01/1977 |
| 4003086 | Dynamic loop gain alteration for data retrieval A method and apparatus for recovering data stored on a magnetic medium which includes a variable frequency oscillator and a variable frequency oscillator feedback control loop therefor as a part of the data read circuitry, and which includes means for att... | 01/11/1977 |
| 3996558 | Error detection and recovery from magnetic tape Improved recovery of information from magnetic tapes is provided by storing information on the tapes in the form of a number of partitions, each containing a certain number of words. A check-sum word is included at the end of each partition. When data wor... | 12/07/1976 |
| 3988580 | Storage of information An arrangement for applying the bits of a binary coded word to the inputs of respective ones of a first plurality of reiterative digital stores in a predetermined time sequence. A further means is provided for subsequently applying a code of parity bits f... | 10/26/1976 |
| 3979721 | Pulse code modulation recording and reproducing apparatus A PCM recording and reproducing apparatus comprising an error detecting circuit for detecting a frame including at least one word information signal with an error, the frame being a reproduction signal read from a recording medium on which certain pulse c... | 09/07/1976 |
