1
Gert Siegle, Albrecht Altmenn: Method and apparatus for transmitting and receiving additional information in a television signal. Blaupunkt Werke, Flynn & Frishauf, March 14, 1978: US04079419 (236 worldwide citation)

Identification of a program being transmitted is encoded digitally on a sub-carrier modulated on the sound carrier of a television signal with each elementary code group occupying a television field interval, the information being transmitted in cycles of several television fields. The sub-carrier f ...


2
Hans Duckeck: Radio link remote control signaling system, and method. Blaupunkt Werke, Frishauf Holtz Goodman & Woodward, October 9, 1984: US04476573 (96 worldwide citation)

To permit simultaneous transmission of command codes, in binary command words, with traffic or other announcements, being broadcast over an FM transmitter which has a 57 kHz subcarrier AM modulated by an announcement recognition (AR) signal, for example 125 Hz, use is made of the long response time ...


3
Wilfried Hehr: Large-area light source. Blaupunkt Werke, Frishauf Holtz Goodman & Woodward, July 7, 1981: US04277817 (81 worldwide citation)

To provide for uniform output throughout the area of the light source, particularly to provide a background illuminating surface for liquid crystal display, an especially adapted for automotive application, the light-emitting surface is formed as a wedge-shaped body of transparent material, such as ...


4
Lothar Vogt, Stefan Bartels, Rainer Arnold, Detlef Schwarz: Radio receiver adjacent-channel interference suppression circuit. Blaupunkt Werke, Frishauf Holtz Goodman & Woodward, August 16, 1994: US05339455 (75 worldwide citation)

A mobile radio receiver, for example, a car radio, needs a circuit to detect and suppress adjacent-channel interference. This can be done by using bandpass filters (14) of differing bandwidth. The present invention dynamically adjusts bandwidth to an optimum value by continuously comparing (13) a fi ...


5
Reinhard Hopf: Method and apparatus for classifying audio signals. Blaupunkt Werke, Frishauf Holtz Goodman & Woodward, September 17, 1985: US04542525 (60 worldwide citation)

The null transitions of an audio frequency signal are converted by Schmitt trigger circuits, one of which has a small hysteresis range centered on the null value and the other of which has a much larger hysteresis range likewise centered on the null value, into two binary pulse sequences of variable ...


6
Ulrich Vogelsang: Compact disc (CD) player and method of compensating for tracking jumps. Blaupunkt Werke, Frishauf Holtz Goodman & Woodward, January 3, 1989: US04796247 (59 worldwide citation)

To provide for continuity of audio output from a compact disc (CD) player, installed in an environment subject to shock or vibration, for example in a motor vehicle, the CD player includes an extra write-read memory (31), placed in the signal processing path of a signal scanned by an optical scannin ...


7
Horst Germer: Method and system for matching the sound output of a loudspeaker to the ambient noise level. Blaupunkt Werke, Frishauf Holtz Goodman & Woodward, December 9, 1986: US04628526 (52 worldwide citation)

A microphone picks up a signal in response to both the acoustic output of the speaker and the ambient noise at the loudspeaker location, for example, in an automobile. The microphone output signal and the signal which is to be provided to the loudspeaker with variable amplification are each subjecte ...


8
Walter Katthan: H-F Portion of TV receiver. Blaupunkt Werke, Frishauf Holtz Goodman & Woodward, January 26, 1982: US04313222 (49 worldwide citation)

The output electrode of a field effect transistor of a high-frequency input stage is connected to a capacitively coupled input (gate) electrode of the field effect transistor of a mixer stage through one of a pair of bifilarly wound coils provided on a ferrite core, while the second of these coils c ...


9
Alfons Weinert, Klaus Groger: Vehicular tape deck locking and lock-state indicating arrangement. Blaupunkt Werke, Frishauf Holtz Goodman & Woodward, May 3, 1988: US04741185 (44 worldwide citation)

To retain an accessory apparatus including a tape unit, such as a tape deck forming part of an automobile radio, in a vehicle, such as a car or a boat, a dummy cassette (17) is provided, having an externally visible lock (18) which operates a locking bolt (23) which, upon lock operation, deflects fr ...


10
Lothar Vogt, Dieter Poschen: Apparatus for converting a signal of a first sample rate into a signal of a second sample rate. Blaupunkt Werke, Frishauf Holtz Goodman & Woodward, June 2, 1992: US05119093 (43 worldwide citation)

Sample values of a digital signal of a first sample rate are supplied to a digital filter for conversion into a digital signal of a second sample rate. The coefficients of the digital filter are calculated by a processor from the ratio of the sample rates or are obtained by a read-only memory contai ...