JPS6359572B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a receiver having a frequency search device.

For example, a driver traveling a relatively long distance on a motorway is informed on the basis of signs not only of the distance to his destination, but also of the area in which he is just driving. However, in the section between the two signs, up until now, the only way to obtain the above information was to rely on memory.

The object of the invention is to automatically retrieve and indicate this information independently of the driver.
The information should then be derived from information already available today, so that no additional equipment on the motorway or road is required.

The present invention takes advantage of the following facts. That is, current very high frequency transmitters have a limited range;
Also, based on the ultra high frequency transmitters (U, K, W) which are distributed and located in different areas throughout the country, different combinations of ultra high frequency transmitter frequencies are received and the combinations also cover different areas. It can be clearly defined.

This task is accomplished by the present invention in the first step for storing all the transmitters received during one sweep of the transmitting frequency search rotation device as a transmitting actual frequency spectrum.
a control circuit having a temporary storage for a number of position codes, a fixed storage for a number of position codes, each with an associated transmission setting frequency spectrum, and a comparison stage connected to the temporary storage and to the fixed storage; This is solved by providing a transmitter connected to the transmitter, in which the transmit set frequency spectrum is temporarily stored, and an indicating device for a position code that corresponds to the actual spectrum.

Next, embodiments of the present invention will be described in detail based on the drawings.

The radio receiver 1 shown in FIG. 1 and having a frequency search device 2 receives via an antenna 3 the high-frequency signals of all transmitters which are incident on the reception location with sufficient field strength. In a stage which is downstream of the radio receiver and which is not individually shown in detail, the respective transmission frequency of the transmitter acquired by the frequency search device is detected in a known manner. The transmission frequencies of all transmitters detected during one sweep of the transmission frequency search device are stored in the first temporary storage device 4. Any suitable type of known memory module can be used as temporary storage. This temporary storage device 4 is connected to the comparison stage 6.
It is connected to a control circuit 5 having a. The components of such control circuits and comparator stages are also known to those skilled in the art. The output of the temporary storage device 4 is connected to a first data input 6 a of the comparison stage 6 , while the second data output 6 b of the comparison stage is connected to the output of the fixed storage device 7 .

In addition to a certain number of position codes, the fixed storage device 7 stores the transmission frequencies that can be received each time at that position as the frequency spectrum set by the associated transmitter.

Writing of the storage contents of the fixed storage device 7 will be explained in detail based on FIG. 2. For a location in the area with location code A, the standard receiver has detected, for example, five predetermined transmitter frequencies, which are distributed in the ultra-high frequency band (UKW) as shown, as being worth receiving. . For regional location E, the same standard receiver has detected, for example, the same five predetermined transmitter frequencies as being worth receiving. Such data is respectively detected for further regional locations and written to permanent storage.

Reception-worthy means in this case those frequencies of the transmitter whose field strength during reception is above a predetermined threshold value. In the case shown here, the frequency spectra of the first and last two transmitters of the frequency spectrum of the transmitter at position A and the frequency spectrum of the transmitter at position E coincide.

The transmission frequency spectra individually stored in the fixed storage 7 are, for example, fed one after the other to a comparison stage 6 for comparison, with the control unit 5 supplying the necessary control pulse trains for the process to proceed. If, during the comparison carried out here, a coincidence occurs between the transmission set frequency spectrum and the contents of the temporary storage, the position code assigned to this transmit set frequency spectrum is connected to the corresponding output 6c of the comparison stage. The instruction is given by the instruction device 8 that is located there.

In parallel with this indicating device 8, the same output side 6 as mentioned above
An interface 9 can be connected to c. A device 10 can be connected to this interface, which is used for the preselection of the mobile radio area (for security, public communications, safe operation) in which the detected position is located.

Preselection devices of this type have already been available on the market for several years. In the known device, the mobile radio region is preselected by a manual switch, so that only the frequencies of radio transmitters belonging to this mobile radio region can be heard. If the field strength of the radio transmitter selected and made audible is extremely weak, the alarm is automatically turned on and connected. The alarm then warns the driver of the vehicle to leave the reception area and therefore also certainly the service area of the radio transmitter.

The operation of the comparison stage 6 will be explained in detail with reference to FIG.

The actual frequency spectrum of the transmitter is applied from the temporary storage 4 to the data input 6a. One of the transmission set frequency spectra stored at the moment of comparison is supplied from the fixed storage device 7 to the data input 6b. The matching transmission frequencies in both spectra are counted by the counting stage 11. This number is supplied in calculation stage 12 via 12a as the total number of frequencies of the transmitter in the transmit set frequency spectrum (this number is stored in a fixed storage in addition to the transmit set frequency spectrum and the position code). ) compared to

This ratio is then written into auxiliary storage 13 together with the associated position code. This ratio is then also detected for all further position codes and the ratios are subsequently arranged in the auxiliary storage 13 according to their magnitude. The position code corresponding to the largest ratio is sent to the pointing device for indication.

If only a few positions are stored in the fixed storage, it is desirable to search for typical positions for each mobile radio area and to select the code of the mobile radio area as the position code. The device 10 can then be controlled directly by means of its code.

If the ratio is below a predetermined limit and a sufficiently accurate result is not obtained, a new transmitter frequency search can be initiated. This is desirable for the following reasons. During the process, the following inconvenience may easily occur due to poor reception conditions at a certain location. In other words, the transmitter frequency, which largely defines the spectrum, is momentarily incident only extremely weakly.

In order to avoid the risk of having two maximum ratios of the same magnitude and thus not being able to give an unambiguous indication, the counting stage 21 calculates the total number of transmitter frequencies in the actual frequency spectrum of the transmitter at the data input. Corresponding to the first ratio, using the calculation stage 22 inputted via 22a, the number of transmitter frequencies that correspond to the set frequency spectrum of the transmitter in the actual frequency spectrum of the transmitter and the actual frequency of the transmitter are calculated. A second ratio can be formed from the ratio with the total number of transmitter frequencies present in the frequency spectrum and arranged in auxiliary storage 23 according to the values.

Then, in the comparison stage 14, the position code having the highest ratio in both the two auxiliary storage devices 13, 23 is selected.

[Brief explanation of the drawing]

FIG. 1 is a block diagram outlining the receiver of the present invention; FIG. 2 is a graph diagram showing frequency spectra A and E of two transmitters at different positions;
FIG. 3 is a block diagram showing an embodiment of the control device of the present invention. 1... Receiver, 2... Transmitter frequency search device, 3... Antenna, 4... Temporary storage device, 5...
. . . Control device, 6, 14 .

Claims (1)

[Claims] 1. In a receiver having a transmission frequency search device, a first temporary storage for storing all transmission frequencies received during one sweep of the transmission frequency search device 2 as a transmission actual frequency spectrum. Device 4
and a fixed storage device 7 for a number of position codes, each with a number of assigned transmission setting frequency spectra, and a comparison stage 6 connected to said temporary storage device 4 and to the fixed storage device 7. characterized in that there is provided a control circuit 5 and a position code indicating device 8, which is connected to the control circuit 5 and has a transmission set frequency spectrum that corresponds to the temporarily stored transmission actual frequency spectrum; A receiver having a transmission frequency search device. 2 Included in the actual transmission frequency spectrum,
and form a ratio between the number of transmission frequencies that match the transmission frequencies included in the transmission configuration frequency spectrum and the total number of transmission frequencies for each position code included in the transmission configuration frequency spectrum, and Auxiliary storage device 1 depending on the size
3 and which serves to supply the indicating device 8 with a position code having the largest ratio.
2. A receiver according to claim 1, further comprising a computing mechanism (12) provided therein and having said auxiliary storage device (13). 3 Included in the transmitting actual frequency spectrum,
and form a ratio between the number of transmission frequencies that match the transmission frequencies included in the transmission configuration frequency spectrum and the total number of transmission frequencies for each position code included in the transmission configuration frequency spectrum, and Auxiliary storage device 2 depending on the size
3 and which serves to supply the indicating device 8 with a position code having the largest ratio.
2. A receiver according to claim 1, further comprising a computing mechanism (22) located within the receiver and having an auxiliary storage (23). 4. Two computing units each with an auxiliary storage are provided, and between the two auxiliary output storages there is a further comparison stage 14, which compares in both the two storages. 2. A receiver as claimed in claim 1, operative to indicate the position code having the highest ratio.