JPH08102691A - Rds receiver - Google Patents

Abstract

PURPOSE: To prevent the generation of miscorrection accompanying the correction of time near correct time by correcting only minute data in a clock means at the time of judging the non-coincidence of only minute data by a time lag decision means. CONSTITUTION: A clock function is built in a microcomputer 12, an internal clock is compared with time data in CT data obtained from an RDS data synchronizing/error correcting part 11 and the minutes of the built-in clock are corrected based upon CT data. In this case, the time data of the internal clock are compared with that of local time, and when both the data coincide with each other, the minute data of the internal clock are compared with that of the local time. When both the data are different from each other, the minute data of a clock timer in the internal clock are allowed to coincide with the minutes of the local time. Consequently only the minute data of the clock means are automatically corrected so as to coincide with time data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an RDS receiver.

[0002]

2. Description of the Related Art C is used for RDS broadcasting carried out in Europe.
Time data called T data is included, and by detecting this data, the time, year, month, day, and what week, etc. can be displayed.

In RDS broadcasting, 1187.5 bits are transmitted per second, and 1 group is 104 bits, so about 11 groups are transmitted. Since CT data is one group in the CT data, it will be transmitted with an accuracy of 1 / 11th of a second. However, since the CT data is transmitted only once in the 11th block at 59th second of the 1st minute, if the CT data is missed once, one minute will be delayed.

Therefore, the RDS receiver normally has a clock function inside and usually counts the time internally.

It is possible to adjust the timepiece by matching the internal timepiece with the CT data and matching them.
Since there is a time difference depending on the country where RDS broadcasting is performed,
Time of actual driving place and CT data of RDS broadcast
It may be different from the time of day. Therefore simply C
It was not possible to automatically adjust the clock with T data.

In order to solve the above-mentioned problems, the applicant of the present invention has provided an RDS receiving apparatus which automatically adjusts only the minutes of the clock that are not related to the time difference, according to Japanese Utility Model Application Laid-Open No. 4-44741. According to this, the time data included in the detected RDS signal is
The data is compared with the time by the built-in clock means, and only the minute data of the clock means is automatically corrected according to the time data.

[0007]

However, the above-mentioned device has the following problems.
For example, it has been found that there is a problem in the vicinity of the hour such as 9:00 or 10:00.

That is, the time data sent as CT data
If the data is 10:01 and the internal clock is 9:59, only the minute data of the internal clock is 59
→ I will modify it to 01. Then, it should be correct at 10:01, but it will be corrected to 9:01.

An object of the present invention is to prevent the time of the internal clock from being corrected by time data having a time difference in order to solve the above-mentioned problems, and at the same time prevent an erroneous correction due to the correction near the hour. To do.

[0010]

In order to achieve the above object, the present invention provides an RDS receiver of the present invention, means for detecting time data included in an RDS signal, built-in clock means, and detection means. The time difference determination means for comparing the time data determined by the clock means with the time difference determination means and the time difference determination means for determining that the minute data does not match, When only the minute data does not match, the gist is that the time correction means for correcting only the minute data of the clock means is provided.

[0011]

If the "hour" of the internal clock does not match the hour data of the received time data, the minute correction is not performed, so that an erroneous correction near the hour can be prevented.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In the block diagram of FIG. 1, the RDS broadcast received by the antenna 1 includes a high frequency amplification unit 2, an intermediate frequency amplification / detection unit 3, a stereo demodulation unit 4, a tone control unit 5, a volume control unit 6 and The sound is converted from the speaker unit 8 via the low-frequency amplifier unit 7. RDS data is intermediate frequency amplification /
57 KHz bandpass filter 9 for RDS from the detector 3
Is input via the RDS data demodulation unit 10 to the microcomputer 12 via the RDS data synchronization / error correction unit 11.

A clock function is built in the inside of the micro computer 12, where the internal clock and the RDS data are stored.
The time data in the CT data from the data synchronization / error correction unit 11 is compared and the built-in clock is corrected based on the CT data. The microcomputer 12 is provided with a switch section 13 and a display section 16 so as to perform control based on various operation commands, and to cause the display section 16 to display various kinds of display such as time. Incidentally, 14 is a low-pass filter, and 15 is a PLL unit.

FIG. 2 is a partial operation flow chart of the above-mentioned microcomputer, and the automatic adjustment operation of the minutes will be described using this flow chart.

While updating the internal clock data (step 3
0), when RDS CT data is received (step 3)
1) Based on the local time offset (offset value with respect to standard time) sent together with this CT data, it is converted into the local time received (step 32). That is, the CT data of the receiving RDS station
The data is transmitted in UTC (Coordinated Universal Time), and the local time offset for converting to local time is also transmitted at the same time. This local time offset is a code uniquely set by each broadcasting station based on the time difference of each country.

Therefore, the UTC and the local time offset of the CT data can be used to convert to the local time.

Then, the time data of the internal clock and the time data of the local time are compared (step 33). If they match, then the minute data of the internal clock is compared. And local time data are compared (step 34),
Only when these are different, the clock timer of the internal clock −
To match the local time (step 35).

Note that between A and B in FIG. 2, the determination order of the hour and the determination of the minutes may be reversed as shown in FIG.

[0020]

As described above, according to the present invention, only the minute data of the timepiece means is automatically corrected in accordance with the time data. Moreover, it is possible to prevent erroneous correction near the hour due to the correction of only the data.

[Brief description of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is an operation flow chart of the microcomputer of the present invention.

FIG. 3 is another operational flowchart of the microcomputer of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 antenna 2 high frequency amplification section 3 intermediate frequency amplification / detection section 4 stereo demodulation section 5 tone control section 6 volume control section 9 57 kHz band pass filter for RDS 10 RDS data demodulation section 11 RDS data synchronization / error -Correction section 12 Microcomputer 13 Switch section 14 Low-pass filter 15 PLL section 16 Display section

Claims (1)

[Claims] 1. A means for detecting time data included in an RDS signal, a built-in clock means, and comparing the detected time data with the time by the clock means to obtain time data. In addition, when only the minute data does not match by the time shift determining means and the time shift determining means for determining that the minute data does not match, the minute data of the clock means. An RDS receiver, characterized in that it is provided with a clock correction means for correcting only the above.