Process for storing of data of a received carrier frequency of a

Details Process for storing of data of a received carrier frequency of a Process for storing of data of a received carrier frequency of a

1998-05-11

2000-02-29

Bost, Dwayne D.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4551851, 4551861, H04B 118

Patent

active

060320303

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to a method for storing the data of a received carrier frequency of a radio transmitter.


BACKGROUND INFORMATION

There are on the market radio receivers having a data memory in which the transmitters being received are stored, with their PI codes and their alternative frequencies, in the sequence of their reception.
Also known, from German Pat. No. DE 39 17 263 A1, are data memories in which there is associated with each memory cell for an alternative frequency an evaluation memory which registers how often it is received.
In the known radio receivers, when a change occurs in the program being received, a check is first made as to whether the PI code associated with the program just selected, and the carrier frequency being received, are already stored. When, for example, the result is only that the number in the evaluation memory is incremented because the carrier frequency is already stored.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 depicts an exemplary block diagram of a radio receiver having a data memory configured for the method according to the present invention.


DETAILED DESCRIPTION

The radio receiver as shown in FIG. 1 is set, by means of an operating element 1, to a specific carrier frequency of a radio transmitter which lies in the frequency spectrum received via the attached antenna 2. In mixer stage 3, the selected carrier frequency is separated from the other carrier frequencies in the frequency spectrum being received. The modulation of the selected carrier frequency is converted to an intermediate frequency and amplified in IF stage 4, and then separated from the intermediate frequency in demodulator 5. The modulation then passes through a frequency splitter 6. The low-frequency program signal in the modulation is amplified in a LF stage 7, and made audible via a connected loudspeaker 8.
In a decoder 9 which is located downstream from a second output of frequency splitter 6, the 57-kHz auxiliary carrier for the RDS signals are demodulated in the modulation of a received RDS transmitter, and the recovered RDS signals are decoded.
The sequence of process steps in decoder 9 necessary for decoding and for storage of the received RDS signals in the circuit stages described below is controlled, in known fashion, by the program of a microprocessor .mu.P (not depicted in further detail).
In FIG. 1, the functional stages described below are depicted, for the sake of clarity, as physically separated circuit stages. Their functions can, however, also be implemented by means of functional steps succeeding one another in time in a program-controlled circuit stage.
After decoding, the data of the recovered PI code of the received RDS transmitter can be tapped at an output 10 of decoder 9, and the data of the selected carrier frequency can be tapped at an output 11 of decoder 9. These data are compared with the data stored in a main memory 12, and stored again if applicable.
In FIG. 1, the memory cells for the data to be stored are depicted, for the sake of clarity, as being physically separated in terms of their various significances and pertinences, and those memory cells with the same significance are interconnected by means of a bus line. In practice, this association of the data with one another is achieved, in known fashion, by appropriate addressing of the data when they are stored.
In contrast to the existing art, the program of the microprocessor is additionally designed, when new data are being stored, so that first the regional identifier is detached from the full PI code in a regional stage 13 which is downstream from output 10 of decoder 9. When a PC code is received for the first time, this regional identifier is stored separately from the main portion of the PI code.
The remaining main portion of the received PI code is then compared, in a first comparison stage 14 or in a first comparison step, with the main portions, arranged in ascending order and called up in succession from associated memory cells 15 of main memory 12, of pre

REFERENCES:
patent: 5537674 (1996-07-01), Kishimoto et al.
patent: 5631707 (1997-05-01), D'Errico
patent: 5640696 (1997-06-01), Ishikawa et al.
patent: 5822686 (1998-10-01), Lundberg et al.
patent: 5857149 (1999-01-01), Suzuki
patent: 5946605 (1999-08-01), Takahisa et al.

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