Blaupunkt-werke Gmbh

Robert Boschgmbh

Matthias Herrmann

Lothar Vogt

Djahanyar Chahabadi

Juergen Kaesser

Jurgen Kaesser

Jurgen Kasser

Wilhelm Christ

Alfred Hoch

Bernhard Zeiss

Lars Ulrich

Ralf Kuebler

Hagen Sassnick

Randolf Ernst

The invention relates to a method for producing an injection valve for liquids, preferably an injection valve for injecting fuel into a combustion chamber of an internal combustion engine. The injection valve has a valve body, with a valve seat which is formed therein, and a valve needle which interacts with the valve seat in order to open and close at least one injection opening. The injection valve is produced by means of the following method steps: producing the valve body from steel, hardening the valve body, annealing a partial region of the valve body at an annealing temperature. The device for carrying out the method according to the invention has an inductive annealing generator which generates a suitable alternating current for operating a coil, in the magnetic field of which coil the valve body can be heated for annealing.

Injection valve, method for its production, and apparatus for performing the method

A method for remote diagnosis and central error evaluation of decentralized electronic devices () with an integrated telecommunications device () includes the steps of storing information about malfunctions of a decentralized electronic device () in a diagnosis memory () of the electronic device (); making a telecommunications connection of the electronic device () with a central error evaluation station (), controlled by the user of the electronic device (); transmitting error data from the diagnosis memory () to the central error evaluation station (); and evaluating the error data in the central error evaluation station ().

Remote diagnosis and central fault evaluation method of decentralized electric devices, and decentralized electronic device

A receiver for a radio broadcast signal, in particular a car radio, and a method for receiving a radio broadcast signal, including a signal decoder for decoding an audio signal contained in the radio broadcast signal in encoded form, and/or for decoding a data signal contained in the radio broadcast signal in encoded form, the signal decoder being operable so that the encoded signal is only decoded, when the signal decoder obtains an external authentication signal, which is received via an external transmission path that is different from the transmission path of the radio broadcast signal.

Method and receiver for receiving a radio broadcast signal having encoded contents

Digital filter

Circuit arrangement for deriving a quality signal dependent on the

In a circuit for deriving at least one quality signal that is dependent on the quality of a received signal, where the received signal is demodulated, a first auxiliary signal which is dependent on the field strength, and a second or further auxiliary signal, are derived from the demodulated signal. The auxiliary signal and the second or further auxiliary signal are combined to derive the quality signal.

Radio receiver circuit for deriving at least one reception quality signal

Circuit arrangement for deriving signals for masking audio signals

Radio receiver having digital signal processing

A circuit arrangement for recognizing adjacent channel interference in a stereo radio receiver, in which a stereo multiplex signal is present. An adjacent channel interference signal is obtained as a function of a direct voltage portion of the stereo multiplex signal and as a function of the spectral components of the stereo multiplex signal above 60 kHz.

Circuit arrangement for the recognition of adjacent channel interference

Circuit arrangement for deriving a signal indicating noise in a received

In a circuit for suppressing short-lived noise phenomena in a digital audio signal, in particular during a temporary test reception of another transmitter, the audio signal is multiplied by a factor which, prior to the appearance of the noise phenomenon, is brought from a maximum value to a minimum value in accordance with a predetermined time function, and at the end of the noise phenomenon, is returned to a maximum value. The invention has special application to the Radio Data System defined by the European Broadcasting Union, and the testing of 'Alternative Frequencies' in that system.

Circuit for suppression of short-lived noise-phenomena in a digital

Radio receiver with digital signal processing

Circuit arrangement for derivation of a signal dependent on the change

Radio receivers which scan through a predetermined band of the radio spectrum, in a station-seeking mode, must independently detect whether the currently tuned frequency is the central frequency of the transmitting station and whether this transmitter provides a signal whose strength is sufficient, i.e. whose strength exceeds a predetermined threshold value. Once these two conditions are satisfied, the radio generates a 'stop' signal which terminates the station-seeking mode, i.e. keeps the tuning circuit set to the frequency which provided the sufficiently strong signal. The present invention provides an unusually simple way to determine whether these two conditions are satisfied, by using a Finite-Impulse-Response digital filter (2) to extract a d.c. component of the demodulated signal (MPX), for comparison (6) with a predetermined maximum value, and by filtering (10) a field strength signal (FST), for comparison (11) with a predetermined minimum value. When both conditions are satisfied, a simple AND-gate (8) generates the stop-signal.

Radio receiver station-seeker stop-signal generator

In a circuit for digital processing of audio signals in a radio receiver, preferably in a car radio, the audio signals pass through a digital filter designed as a tone control, whose frequency response can be controlled with supplied coefficients, and a volume control, whose transmission factor can be controlled with supplied control signals. If the high and/or low frequencies are raised, the transmission factor of the filter at medium frequencies can be correspondingly lowered. Volume control compensates for the reduction. The volume control may contain a digital and an analog portion.

Growing community of inventors

Hildesheim, Germany

Matthias Herrmann