Patent
Automatic synchronizing system for digital asynchronous communications
Harvey M. Masters
- 01 Mar 1979
42
TL;DR: In this paper, an asynchronous system for transmitting digital data from a data origination station to a data utilization station over a communications path such as an ordinary long-distance telephone network is disclosed.
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Abstract: An asynchronous system for transmitting digital data from a data origination station to a data utilization station over a communications path such as an ordinary long-distance telephone network is disclosed. The system includes circuitry for synchronizing and maintaining synchronization between the receiving circuits and the transmitting circuits and for correcting errors introduced by the communications path. Each data word transmitted has associated therewith a synchronization code comprising a stop bit and a start bit. During normal operation, the system is synchronized by detecting the start bit which precedes the information portion of each data word. Synchronization is maintained for several data words even though the start bit is not detected due to interference, for example, by an auto-synchronization signal which includes a pulse positioned within the time period during which the start bit would normally be detected. Additionally, should a predetermined number of successive data words arrive at the receiver with errors, the auto-synchronization signal is disabled based on the assumption that the errors are due to a loss of synchronization. The transmitter circuits then transmits two synchronizing words, each containing the synchronization code with all other bits having a logic "zero" level. The synchronization code of the two synchronizing words resynchronizes the system thereby restoring normal operation. That is, the system maintains normal synchronization even though interference destroys the start and/or stop bits of a number of successive words. Should this interference continue such that the automatic synchronization circuits can no longer maintain synchronization, the auto synchronization circuit is disabled and normal synchronization is restored by transmitting two special synchronization words, all without any loss of data.
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Citations
Patent
Cycling error count for link maintenance
Gray Thomas A
- 02 Jun 1995
TL;DR: In this article, a method of determining the reliability of data transmission system links is proposed, which is comprised of transmitting a data stream containing a data integrity sequence and at least one accumulated error count sequence along one of the links, determining the integrity of the data in the stream at the end of the link using the integrity sequence, adding a count of data errors detected to the accumulated error counts, and periodically detecting the count as a measure of the reliability.
59
Patent
Automatic baud rate detection
Gary R. Key,David C. Black +1 more
- 25 Jan 1989
TL;DR: In this article, a method for determining the baud rate of a data stream by comparison of captured data to known autobaud characters is presented, where samples are received from the communication device and stored in memory until a set of the samples are accumulated.
46
Patent
Synchronous data receiver circuit
Osamu Sato
- 20 Jun 1985
TL;DR: In this article, the synchronous data receiver circuit, after temporarily storing received data in a data memory having a large enough capacity to store at least two frames, detects a frame synchronization signal pattern with a pattern match circuit, then stores the message data alone of the received data and detects errors with a decoder.
37
Patent
Error-tolerant byte synchronization recovery scheme
Alok Gupta
- 12 May 1995
TL;DR: In this paper, an improved technique for detecting a byte synchronization field encoded on a data storage drive is presented, which correctly recovers byte synchronization even if the byte is corrupted by a single burst error of as many as b bits.
35
Patent
Method and system for supporting multiple external serial port devices using a serial port controller in embedded disk controllers
Michael R. Spaur,Ihn Kim +1 more
- 10 Mar 2003
TL;DR: In this article, a serial port controller in an embedded disk drive controller is provided, which includes a state machine that can access protocol information regarding plural devices operationally coupled to the serial port, and logic for enabling the plural devices for either a write or read request.
24
References
Patent
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Ernest N. Dulaney,Richard F. Elmhurst +1 more
- 29 Oct 1974
TL;DR: In this article, a method and apparatus for monitoring the accuracy of electronic data transmitted over a communication channel or telemetry link is disclosed for measuring the bit error rate (BER) of a given quantity of data transmitted.
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Patent
Digital data transmission system
Masters Harvey M
- 31 Jul 1972
TL;DR: In this article, an approach for transmitting digital data and for correcting errors which occur in the transmission of the data while maintaining high transmission efficiency is disclosed, where the retransmitted data words are detected by the transmitter and compared to the words as originally transmitted, and the transmission sequence is repeated beginning with the word found to contain an error.
24
Patent
Systems for detecting errors in a digital transmission channel
D Merlo
- 07 Jun 1971
TL;DR: In this paper, a system for detecting transmission errors arising in a digital transmission channel in which digits of a predetermined multidigit check signal not related to the information digits, are inserted successively after respective groups of information digits before transmission.
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