JPH04217122A - Radio receiver - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio receiver mounted on an automobile or the like.

0002

[Prior Art] Car radios generally have a preset function, so they can select several broadcast stations (receiving frequencies).
If you preset it, you can tune in to your desired broadcast just by pressing the tune key.

0003

[Problem to be Solved by the Invention] However, for example, when driving from Tokyo to Nagoya on the Tomei Expressway, the broadcasting stations in Tokyo can be received at first, but the reception gradually deteriorates as the car travels. Eventually, you will no longer be able to receive it. However, if you select a Shizuoka station from the beginning, you will not be able to receive the Shizuoka station at first, but as you drive, you will gradually be able to receive it, and eventually you will be able to receive it well. . However, the reception at this Shizuoka station also deteriorated as it approached Nagoya, and eventually became unreceivable.

[0004] In other words, there is a limit to the area (service area) in which one broadcast station can be received, and the broadcast stations that can be received differ depending on the location, so as the car travels, the broadcast stations that can be received and their reception status gradually change. .

[0005] Therefore, it is necessary to change the selection of stations as the car travels, but since the number and frequencies of broadcast stations that can be received vary depending on the location, it is necessary to change the preset contents while the car is driving.

[0006] The present invention attempts to automate such processing or operation.

[0007]

[Means for solving the problem] Now, if we think about car phone systems such as the MS system, in this car phone system, the handset (car phone) can transfer from the service area of one base station to another base station while making a call. You can move to the station's service area. Alternatively, calls can be made and received from a car moving at high speed.

[0008] For this reason, in the car telephone system, each base station always knows or manages the current location of the handsets and transmits various information to the handsets in its own service area. The information also includes specific data (code) indicating the base station. In addition, the handset stores data indicating the base station, and when making a call,
A call is requested to the base station whose data is stored.

[0009] Focusing on these points, the present invention receives information transmitted by a base station of a car phone, extracts data indicating the base station, determines the current location from the data indicating the base station, This location data is used to refer to a table, and broadcast stations that can be received at that location are set in the receiver's channel selection circuit by operating the channel selection key.

That is, in the present invention, if the reference numerals of each part correspond to the embodiments described later, there is a circuit 10 that receives information transmitted from a base station of a mobile telephone and outputs data BSDT indicating the base station. , a memory table 41 having, for each divided region, tuning data Nij for selecting broadcast stations that can be received in the divided regions when the target region is divided into a plurality of regions; A first decoder 42 decodes data BSDT indicating the base station into data LAI specifying the divided regions of the memory table 41, a tuning key 51, and an output of the tuning key 51, Channel selection data Nij
A second decoder 43 is provided to decode the data LAI from the first decoder 42 into data for selecting.
and the data from the second decoder 43, the channel selection data Nij from the memory table 41 is specified and extracted, and the extracted selection data Nij is set in the channel selection circuit.

[0011]

[Operation] Based on the information transmitted by the base station of the car phone, the current location of the car is determined, data for channel selection is selected according to the result of this determination, and furthermore, among the selected data, , the data of the desired broadcasting station is set in the receiver by key operation, and the broadcasting station is selected.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 10 indicates a handset of a car telephone system, and reference numeral 20 indicates a radio receiver, which are mounted on a car. In the handset 10, 11 is a transmitting/receiving antenna, 12 is a transceiver, and the handset 10 receives information from the base station as described above, and transmits data BSDT indicating the base station, that is, the handset 10. It stores data BSDT indicating the base station providing the current service area.

Further, in the receiver 20, 21 is a receiving antenna, 22 is a speaker, and the receiver 20 is of an electronic tuning type.

That is, 30 indicates a PLL, and VCO3
The oscillation signal of 1 is supplied to the variable frequency divider circuit 32 and divided into a frequency of 1/N, and the divided signal is supplied to the phase comparator circuit 33, and the oscillation signal of 1/N is supplied to the variable frequency divider circuit 32. A reference signal is taken out, this reference signal is supplied to a comparator circuit 33, and the comparison output of this comparator circuit 33 is supplied to the VCO 31 through a low-pass filter 35 as its control voltage.

Therefore, from the VCO 31, N×9k
An oscillation signal of Hz is output, and this oscillation signal is supplied to the mixer circuit 25 as a local oscillation signal for frequency conversion. Further, the output voltage of the filter 35 is supplied to the tuning circuit 24 as a control voltage for its tuning frequency.

Therefore, by changing the frequency division ratio N of the frequency division circuit 32, it is possible to select a broadcast of a frequency corresponding to the frequency division ratio N.

Furthermore, 40 is a tuning control circuit, 51 is a tuning key, and 52 is a tuning display. in this case,
The control circuit 40 is actually configured by a microcomputer, and the circuits 41 to 43 are configured by a microcomputer (
The functions and processing of the control circuit 40 are expressed by hardware. Further, 41 is a table memory, 42 and 43 are decoders, and 44 is a character generator.

In this case, the memory 41 has data tables as shown in the second to fourth columns of FIG. 2, for example. That is, in this example, the target area is Japan, and the target area is divided into nine regions "Hokkaido" to This is the case when it is divided into "Kyushu". The memory 41 has a local number LAI for each divided region, and for each divided region, data STTN of the names of broadcasting stations that can be received in that region and information for selecting that broadcasting station. It has the necessary frequency division ratio N. For example, for "NHK Tokyo 1st Broadcast", LAI = 4, STT
It has data such as N=“NHK Tokyo 1st” and N=N41. The frequency of NHK Tokyo 1st Broadcasting is 594.
kHz, so if the intermediate frequency is 450 kHz, N41=116 (=(594+450)/9).

The decoder 42 also receives base station data BS.
This is for converting DT into the local number LAI of the local area to which the base station belongs (the local area in FIG. 2) and addressing the memory 41. Further, the decoder 43 selects the channel selection key 5.
1 is converted, and by this converted output, the local code LA
This is to obtain the frequency division ratio Nij of the broadcasting station corresponding to the output of the key 51 in the region addressed by I.

Furthermore, the character generator 44 converts the station name data STTN of a broadcasting station into font data for displaying the broadcasting station name.

The channel selection display 52 is for displaying the names of broadcast stations that can be received in the area where the car is currently traveling.

In such a configuration, if the car is traveling in Tokyo, for example, then base station data BSDT from the handset 10 is supplied to the converter 42, and the base station data BSDT is sent from the converter 42 as the local code LAI to the Kanto region. Data LAI = 4 indicating the region is output.

Then, the memory 41 is addressed by this data LAI, and out of the data in the memory 41, all station name data STTN in the Kanto region (LAI = 4) is taken out. The data is converted into font data and then supplied to the display 52. Therefore, for example, as shown in FIG. The key number will be displayed.

Then, if you press the key number assigned to the broadcast station you want to listen to among the broadcast stations displayed on the display 52, for example, if you want to listen to "NHK Tokyo Daiichi", press the " When the "1" key is pressed, the frequency division ratio N41 of "NHK Tokyo Daiichi" is addressed and taken out using the local number LAI and the output of the key 51, and this frequency division ratio N41 is set in the frequency division circuit 32. be done.

Therefore, the receiver 20 enters the receiving state of "NHK Tokyo No. 1", that is, the broadcasting station designated by the key 51.

[0026] Similar processing is performed when another broadcasting station is selected or when the car is traveling in another region, and the display 52 shows information that can be received in the region where the car is currently traveling. The name of the broadcasting station is displayed, and if the number is input using the key 51, that broadcasting station is selected.

Thus, according to the present invention, information transmitted by a base station of a mobile telephone is received, data BSDT indicating the base station is extracted, and data BSDT indicating the base station is extracted.
The current location is determined from the DT, and the table in the memory 41 is referenced using this location data to preset the broadcast stations that can be received at that location, so even if you travel by car over a wide area, you will be aware of the location. You can preset and listen to broadcast stations without having to worry about it.

In the above description, the handset 10 only needs to output data BSDT indicating a base station, and may be a data BSDT receiving circuit that does not have a telephone function. Also,
Assuming that there is one channel selection key 51, when this key 51 is pressed in the Kanto region, for example, the division ratios N41 to N45 registered in LAI = 4 in the memory 41 are divided in order every time the key 51 is pressed. It can also be set in the circuit 32. Furthermore, the base station data BSDT supplied from the handset 10 to the decoder 42 can be updated when the power is turned on or periodically updated.

[0029]

Effects of the Invention According to the present invention, information transmitted by a base station of a mobile phone is received and data BS indicating the base station is transmitted.
DT, the current location is determined from the data BSDT indicating this base station, and the data of this location is stored in the memory 41.
Since the broadcast stations that can be received at that location are preset by referring to the table, the driver does not need to preset the stations even if the number and frequency of the broadcast stations that can be received change as the car travels. .

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an example of the present invention.

FIG. 2 is a diagram of an example of the contents of a memory table.

[Explanation of symbols]

10　Car phone system handset 20 Radio receiver 30 PLL 32 Variable frequency divider circuit 40 Tuning control circuit 41 Memory 42 Decoder 43 Decoder 44 Character generator 51 Tuning key 52 Tuning display

Claims (1)

[Claims] [Claim 1] A circuit that receives information transmitted by a base station of a mobile phone and outputs data indicating the base station, and a circuit that receives information transmitted from a base station of a mobile phone and outputs data indicating the base station, and a circuit that receives information transmitted from a base station of a mobile phone, and a circuit that outputs data indicating the base station. A memory table that has channel selection data for selecting receivable broadcast stations for each divided region, and data indicating the base station is decoded into data specifying the divided region in the memory table. a first decoder for decoding, a tuning key, and a second decoder for decoding the output of the tuning key into data for selecting the tuning data in the memory table; A radio receiver that specifies and retrieves tuning data from the memory table using data from a decoder and data from the second decoder, and sets the retrieved selection data in a tuning circuit.