JPH0214623A - Radio receiver - Google Patents

Abstract

PURPOSE:To shorten the time up to the detection of a receptible broadcast station by reading broadcast station information of a district from a device storing the broadcast station information of the district and using the readout broadcast station so as to apply preset scanning. CONSTITUTION:A CD-ROM (read only memory using a Compact Disk) 11 is utilized as a storage device for the broadcast station information. The broadcast station information read from the CD-ROM 11 and decoded by a decoder 23 is inputted to a system control section 13 and a 2nd highest broadcast frequency is in the frequencies received at present is retrieved. Then the N value of the retrieved frequency is set in a radio unit 12, the reception processing setting the frequency division ratio of the PLL is applied and the frequency during reception at present is revised into the retrieved frequency in one step. Thus, before the normal search in the unit of channel separation is applied, the broadcast frequency of the district is read from a storage device to apply preset scan, then the search time up to the reception of the desired broadcast frequency is shortened.

Description

[Detailed Description of the Invention] [Summary] In a searchable in-vehicle radio receiver, broadcast station information for the region in which the vehicle is being driven is read out from a device that stores broadcast station information for each region, and the read broadcast station information is used. By performing a preset scan with the receiver, the time required to detect a receivable broadcasting station can be shortened.

[Industrial application field]

The present invention relates to a radio receiver that performs rapid tuning using broadcast station information.

The search function that automatically detects broadcast stations that are receivable at that time is convenient for in-vehicle radio receivers that move to different reception areas as the vehicle moves, and are often operated by the driver. good.

[Conventional technology]

The conventional search function includes Sf!, which automatically changes the receiving frequency sequentially and automatically stops when it detects a broadcast frequency with a certain strength or higher. There are EK (seek) and 5CAH (scan), which automatically restarts changing the reception frequency if no switch is operated after receiving the detected broadcast frequency for a certain period of time.
It is distinguished into ``down'' and ``down''.

[Problem to be solved by the invention]

In conventional searches, the receiving frequency is changed (increased or decreased) for each broadcast frequency separation, so it takes time to detect a receivable broadcasting station.For example, FM
Search up<sa from reception status of 76.0 MHz
In order to receive the broadcast frequency of FM 85.1 MHz using (B), it takes a channel separator of 0.1 MHz and a search time of 50 ms.

The present invention aims to shorten the time required for such a search.

[Means to solve the problem]

The present invention provides a storage device (1) that stores broadcast station information by region.
1), a reading device (15 to 17.23) that reads broadcast station information of a desired area from the storage device, and the storage device (11).
), and a radio unit (12) that performs a preset scan based on the broadcast station information read out from the radio station information read from the radio station information read from the radio station information read from the radio station information read from the radio station information read from the radio station information read from the broadcast station information read from the radio station information.

[Effect]

A PLL synthesizer type radio unit can automatically detect the broadcast frequency in that area by changing the reception frequency for each channel separation. However, this search function wastefully searches between adjacent broadcast frequencies, so in the present invention, the broadcast frequencies of the region are read out from a device that stores the broadcast frequencies of each region, and first, only those broadcast frequencies are sequentially searched. Receive. This is a kind of preset scan method.

Generally, there are multiple broadcast frequencies in one reception area, but if you know the value in advance, there is no need to search in units of channel separation, so you can quickly receive the next broadcast frequency. can. With such a system configuration, the conventional search in channel separation units is only needed to compensate for cases where a recent scan is mistakenly performed on a broadcast frequency in a different region.

〔Example〕

Figure 1 shows an example of the system configuration of the present invention.
(Read-only memory using compact disk) 1
1 is used as a storage device for broadcast station information.

The radio receiver 10 is an integrated unit that houses this CD-ROM II, a PLL synthesizer type radio unit 12, etc. in the same housing, and a system control section 13 supervises all controls, and under its control, a chainer control section 14 and a CD-ROM Control unit 15
works. Reference numeral 16 denotes an optical pickup for reading information on the CD-ROMI 1, and reference numeral 17 denotes a demodulator for demodulating and reproducing the read information. 15 to 17 constitute a reading device.

Various instructions can be given to the system control unit 13 from the operation switch matrix 21. 22 is an indicator that displays the frequency being received (radio operating status),
It is managed by the system control unit 13.

Since the CD-ROMI 1 has a large storage capacity, it can store a large amount of information. be.

Separately, regional broadcast station information (broadcast station name, broadcast frequency, etc.) is stored in correspondence with the subdivided map information.

The map display device 30 includes a display control section 31 and a map display 32 such as a CRT. The decoder 23 decodes map data and additionally provided broadcast station information from the output of the demodulator 17. This map data has regions designated by the switch matrix 21. Among the output data of the decoder 23, map data is taken into the display control unit 31 using the line 11, for example, in a clock synchronous manner. At this time, the display control unit 31 sends the playback time data corresponding to the instructed map data (e.g., 00 minutes to seconds XX block to Δ block) to the system control unit 13 via line 13, and the decoder 23 tVaunted time and CD-ROMI
Information on broadcasting stations receivable in the corresponding area, reproduced from line 12, is sent to the system control unit 13 via line 12. The table below is an example of broadcast frequencies by band included in the broadcast station information.

Table 1 The system control unit 13 sends the data taken in from the decoder 23 and display control unit 31 to the CD control unit 15 via the communication line 14.
and is transmitted to the Chainer control unit 14. The CD control section 15 controls the reproduction of the map specified by the data on line 13.

The map corresponds to each time and can be played in much the same way as playing a music disc. The map time data to be decoded by the decoder 23 is given in advance via line Ii3.12.

FIG. 2 is a flowchart of the first embodiment of the present invention.

After initialization in step S1, the judgments from step 82 onwards are repeated. S2. S3, S5 to S7 are switches (SW) in the switch matrix 21 in FIG.
311 to S15 in the step of determining whether or not has been operated.
are the corresponding processing steps. Also, S
16 is a step of displaying the radio operating status on the reception display 22.

In this example, Sf! in step S6! When the -UPSW operation is detected on B, the search process of step S14 is performed. Third
The figure shows details of this search process (in the upward direction). Step S21 is a process of inputting the broadcasting station information read from the CD-ROMI 1 and decoded by the decoder 23 to the system control unit 13, and searching for the next highest broadcasting frequency after the value currently being received. Step 322 is step 3
This is a reception process in which the N value of the frequency searched in step 21 is set in the radio unit 12, and the frequency division ratio N of the PLL is set. According to this reception process, the frequency currently being received can be changed to the search frequency in one step. Step 323 compares the IF (intermediate frequency) strength or electric field strength of the received frequency with a partial level, and ends if the level is higher than that level. If the listener does not wish to receive this broadcast, please return to SEE again.
Since the upsw button is pressed, the process starts from step S21 and the next highest broadcast frequency is received.

On the other hand, if it is determined in step S23 that the read broadcast frequency cannot be received (the level is low), the process returns to step S21 via step 324 and automatically receives the next broadcast frequency. If you still can't receive it and have gone around the frequency range of the reception band once (or twice), step S.
After 24, move to step 325, normal 5CAN-u
p processing (increasing the reception frequency in channel separation units until a broadcast frequency of a certain level or higher is detected) is performed.

FIG. 4 is a flowchart of a second embodiment of the present invention.

In this example, steps 36 and 314 in FIG. 2 are replaced with step S6'.
, S14, and after step S7, step S8. This is an addition of S9. Step S6'
is the detection of 5CAN SW operation. When this SW operation is detected, a search is performed in step 314' (here, 5CAN
) process.

FIG. 5 shows this 5CAN processing in the up direction. First, in step S31, the current mode is determined, and if it is already the 5CAN-up mode, step 332
to release it. This is because 5CAN is a mode that repeats start and end alternately every time the same SW is pressed. If the current mode is not the 5CAN-up mode in step S31, the process moves to step S21. The contents from step S21 to step S24 are the same as in FIG. 3. Step S2
4 to step 825', normal 5CAN-up processing is performed in which the frequency is changed in channel separation units.

Step S8 in FIG. In S9, the frequency stop time before automatically restarting the scan is set to 5 seconds.

The tuning method executed in steps 521 to S24 in FIG. 3 or 5 is partially similar to the conventional preset scan method in which a desired frequency is set for each channel in advance and the channels are tuned in order. do.

However, ■ The broadcasting frequency corresponding to the area is read from a storage device such as a CD-ROM and used, ■ The normal search is executed after this channel selection, and ■ The conventional preset scan method uses a tuned frequency. It always stays for a certain period of time (for example, 5 seconds), but in the present invention, if a signal higher than a certain level cannot be detected, it immediately moves to the next broadcast frequency (generally less than 200 ms, during which it is muted). The difference is that the broadcast frequency of the area is automatically read out.

〔Effect of the invention〕

As described above, according to the present invention, in a radio receiver equipped with a search function that can automatically receive broadcast frequencies, before performing a normal search for each channel separation, the broadcast frequencies of the area are stored in the storage device. Since it is read and preset scanned, there is an advantage that the search time until the desired broadcast frequency is received can be shortened.

[Brief explanation of the drawing]

Fig. 1 is a system configuration diagram of the present invention, Fig. 2 is a flowchart of the first embodiment of the invention, Fig. 3 is a detailed flowchart of the search process of Fig. 2, and Fig. 4 is a second embodiment of the invention. An example flowchart, FIG. 5, is a detailed flowchart of the 5CAN process of FIG. 10: Radio receiver/stem configuration diagram of the present invention FIG. 1 FIG. 3: 70-chart of the first embodiment of the invention FIG. 2 Two-chart of search processing FIG. 3

Claims (1)

[Scope of Claims] 1. A storage device (11) that stores broadcast station information by region; a reading device (15 to 17, 23) that reads broadcast station information of a desired region from the storage device; and the storage device. A radio unit (11) performs a preset scan based on the broadcast station information read from the device (11), and then performs a normal search in channel separation units.
2) A radio receiver comprising: