Method for transmitting digital data impulses

US6249558A · kind A · utility

Assignees

• Temic Telefunken Microelectronik · DE
• Robert Bosch GmbH · DE

Inventors

• Guenter Fendt · Schrobenhausen, DE
• Stefan Schaeffer · Ingolstadt, DE
• Michael Bischoff · Brentwood, US
• Werner Nitschke · Ditzingen, DE
• Johannes Rinkens · Ingolstadt, DE
• Otto Karl · Leonberg, DE
• Joachim Bauer · Hamburg, DE

Key dates

• Filing date: Mar 29, 1999
• Grant date: Jun 19, 2001
• Expiry date: Mar 29, 2019

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L7/0332
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

Before digital data impulses are transmitted from a transmitter to a receiver that includes a data acquisition signal generator, at least one synchronizing impulse (syn1, . . . ) is transmitted for synchronizing the transmitter with the receiver with regard to a sync frequency that is repeatedly updated to provide a current accepted sync frequency. The at least one synchronizing impulse and the data impulses are Manchester encoded which combines timing (synchronizing) and data signals. An impulse flank change occurring centrally in an impulse width is used as a synchronization point of time. Stepping pulses occurring between two consecutive synchronization points of time are counted and the resulting count is used to determine the sync frequency in response to the occurrence of a synchronizing impulse and at a synchronization point of time. A time shift or delay occurs between data impulses and synchronization points of time. This delay is taken into account by a corresponding time shift in the scanning of the logic levels "0" and "1" of the data impulses. This type of signal transmission is especially suitable for a signal bus in a passenger protection system.