Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1997-07-10
2000-01-25
Chin, Wellington
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
4551582, 4551584, 4551585, 4551612, 4551592, 4551861, H04B 118
Patent
active
060186488
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a process and device for displaying the transmitter name and the type of program transmitted in a digital data telegram on a radio receiver display.
BACKGROUND OF INFORMATION
Radio transmitters have long been transmitting digital data telegrams according to the RDS standard in addition to audible broadcast signals. These data telegrams contain identifiers (PS) for the transmitter name, e.g., NDR1, NDR3, FFN, ANTENNA and identifiers (PTY) for the type of program, e.g., sports, news, classical. The latter identifier (PTY) is transmitted in each RDS group, i.e., 11.5 times per sec, and therefore it appears every 80 ms, whereas only the zero group is used for transmission of the transmitter identifier (PS), and the identifier is fully transmitted only after four consecutive group signals. Since the zero group is transmitted by the radio transmitter only 2-4 times per second on the average, the transmitter identifier appears on the display after 1-2 seconds at the soonest.
There are conventional devices, e.g., the Blaupunkt Berlin car radio which also analyzes the PTY identifier. The PS identifier is analyzed today by practically all RDS receivers to display the transmitter name.
The Blaupunkt Berlin car radio has a menu mode where a certain type of program can be selected and then a search run samples successively the transmitters that can be received and are transmitting a broadcast of the selected type of program. On a display with a large display capacity, the header shows the type of program selected and below that the transmitters identified are displayed in a list.
SUMMARY OF THE INVENTION
The present invention guarantees that the type of program will be displayed with all non-program-type-oriented transmitter searches even if the display has a display capacity of only one line=8 characters. In non-program-oriented transmitter searches, the type of program is identified from the data telegram received and then displayed and not derived from data selected in the menu mode as in the related art.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a first embodiment of the present invention as a block diagram.
FIG. 2 shows a portion of the block diagram illustrated in FIG. 1 with a modification according to a second embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
The digital RDS data telegrams of an RDS radio transmitter reach an RDS radio receiver via antenna 1 and are separated from the signals from other transmitters with the help of a tuning part 3 in an HF input part 2. The data telegrams go to an RDS decoder 9 via an AF amplifier 4 that is followed by an FM detector.
The low-frequency audio signals and optionally the respective stereo signals are processed further in a low-frequency amplifier 5 and reproduced by one or more loudspeakers 6.
Tuning part 3 is tuned by operating station keys 7 on the desired transmitter. Station keys 7 may optionally include several operating levels.
According to a transmitter search run for the transmitter receivable at the given location, a scan processor 8 invokes the individual station keys 7 in succession and may also detect the individual operating levels. Scan processor 8 can also control the tuning of the entire frequency band for receivable transmitters. A particular feature of the controller is that when scan processor 8 leaves the transmitters that have been identified after a brief sampling time of 8 seconds, for example, it proceeds to the next transmitter unless the listener interrupts this automatic feature.
In this known tuning method, only the name of the transmitter received has been displayed during the sampling time of the transmitter search run. However, since spoken contributions and music contributions may follow each other with various types of programs today, the listener may not be inclined to continue listening to a transmitter selected because that transmitter is broadcasting a music selection but the listener is searching for a sports broadcast. However,
REFERENCES:
patent: 4232301 (1980-11-01), Nomoto
patent: 5237420 (1993-08-01), Hayashi
patent: 5345607 (1994-09-01), Liman et al.
patent: 5583873 (1996-12-01), Miyake et al.
Duckeck Hans
Maihs Winfried
Chin Wellington
Robert & Bosch GmbH
Sobutka Philip J.
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