Telecommunications – Receiver or analog modulated signal frequency converter – Measuring or testing of receiver
Patent
1998-02-04
2000-11-21
Urban, Edward F.
Telecommunications
Receiver or analog modulated signal frequency converter
Measuring or testing of receiver
4552261, H04B 118
Patent
active
061514896
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method of supplying a control signal for controlling a radio receiver after a location change and a radio receiver for carrying out this method.
BACKGROUND INFORMATION
It is known that with program-controlled radio receivers it is possible to search for the transmit frequency with the best reception at the given location.
The reception quality of a transmit frequency is known to depend on the distance between the location of the transmitter and that of the receiver. If this distance is increased, transmitter reception quality may be lost.
If various transmit frequencies stored in a radio receiver can be activated by freely selecting one via the actuator, then it is also beneficial to know whether the distance between the transmitter and receiver has changed significantly between two successive operating times at the same transmit frequency, i.e., whether there has been a significant change in location of the receiver in the meantime. Frequent and significant changes in location can be expected with car radios in particular.
SUMMARY OF THE INVENTION
The method according to the present invention is capable of supplying a control signal containing information about a change in location of a radio receiver.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a block diagram of an exemplary program controlled radio receiver equipped to carry out the method of the present invention.
FIG. 2 shows a block diagram of an exemplary microprocessor design for carrying out the method of the present invention.
DETAILED DESCRIPTION
The radio receiver shown as a block diagram in FIG. 1 receives the entire spectrum of transmit frequencies via an antenna 1. In a frequency conversion stage 2, a mixed frequency generated in mixer oscillator 3 is superimposed on the antenna signal. This yields an intermediate frequency modulated with the MPX signal of a certain transmit frequency. This intermediate frequency is amplified in an intermediate frequency stage 4. Then the MPX signal is separated from the intermediate frequency in a demodulator 5 and passes through a frequency dividing network 6. A low frequency stage 7 connected to one of the outputs of frequency dividing network 6 supplies a speaker 8 which renders the program set by selection of the mixed frequency audible.
RDS decoder 9 connected to a second output of frequency dividing network 6 separates RDS signals in the MPX signal from a 57 kHz auxiliary carrier and makes the various RDS signals available at assigned outputs.
Decoding of RDS signals in RDS decoder 9 is controlled by a first subprogram of microprocessor 10.
A second subprogram of microprocessor 10 controls the respective setting of mixer oscillator 3, which can also be freely varied by the operator via actuator 11. For example, the desired program is selected or a search operation (best, search, travel) is initiated with this actuator.
A third subprogram of microprocessor 10 controls the method of supplying a control signal for controlling the radio receiver when there is a significant change in location of the radio receiver.
To carry out this method, the radio receiver has a module 12, whose design is shown in detail in FIG. 2. Module 12 may be integrated into microprocessor 10 or it may be a component of actuator 11.
Module 12 connected to mixer oscillator 3 comprises four separate memories 13 for four transmit frequencies and four assigned memories 14 for the reception quality of these transmit frequencies when set in mixer oscillator 3. This reception quality, determined on the basis of reception field strength in the simplest case, is measured in a measuring stage 15 connected to intermediate frequency stage 4. The four stored transmit frequencies serve as check-back transmit frequencies.
Module 12 includes a first comparator stage 16 in which the value of the reception quality stored in memories 14 can be compared with the instantaneous measurement results of measuring stage 15. Comparator stage 16 has two evaluation states, the first of
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Robert & Bosch GmbH
Urban Edward F.
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