JPS59152731A - Receiving system of radio traffic information - Google Patents

Abstract

PURPOSE:To grasp surely the state of traffic jam on a road or the like by operating the receiving of a radio broadcast sequentially to listen to the traffic information broadcast in plural broad stations. CONSTITUTION:When a traffic information start signal is detected, by a processing circuit 21 gives the signal to a line 34 and a transistor 35 is made conductive to change over a changeover switch 8 to the position of a tuner 7. A carrier frequency of the radio broadcast to be received is scanned once over a frequency band possible for tuning at a high-frequency amplifier circuit 14 of the tuner 7 to select the specific receiving frequency of the radio broadcast in which the signal led from an intermediate frequency amplifier circuit 17 to a line 22 exceeds a predetermined level. Thus, the traffic information is outputted as sound and the receiving operation is again tried by the detection of the end identification signal of the broadcast.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for receiving so-called traffic information such as the status of road traffic congestion using radio broadcasting. It is not held at a regularly scheduled time. Therefore, there is a risk of missing traffic information. Furthermore, while receiving one radio broadcast, it is not possible to listen to traffic information from other radio broadcasts, and therefore it is not possible to drive a car while frequently knowing traffic information.

SUMMARY OF THE INVENTION An object of the present invention is to provide a radio traffic information communication system that allows traffic information in radio broadcasts to be reliably heard and traffic information included in a plurality of radio broadcasts to be heard.

FIG. 1 is a block diagram of one embodiment of the present invention. Radio broadcasts with different carrier frequencies from each broadcasting station 1.2.3 are received by the antenna 4, and the demultiplexing signal 1i1i! '
45 to a tuner 6 similar to a so-called car radio in the United States and a tuner 7 according to the present invention. The audio frequency signal demodulated by the tuner 6 is applied to one individual contact 9 of the decoupling switch 8. The demodulated audible frequency multiple Ji+ from the tuner 7 is applied to another individual contact 10 of the changeover switch 8. The signal from the common contact 11 of the changeover switch 8 is amplified by the amplifier 1h circuit 12 and converted into audible sound by the speaker 13.

The tuner 7 includes a high frequency amplification circuit 14 that performs tuning, a local oscillation circuit 15, a mixing circuit 16, an intermediate frequency amplification circuit 17, and a demodulation circuit 18. The output from the demodulation circuit 18 is applied to the individual contacts 10 as described above.

A phase-locked loop frequency synthesizer 19 is connected in conjunction with the high frequency amplifier circuit 14 and the local oscillator circuit 15. Phase-locked loop frequency synthesizer 19
48 for determining the fractionation ratio from a processing circuit 21 realized by a microcomputer or the like is provided via line 2o. This processing circuit 21 also includes:
A signal is provided from the intermediate frequency booster 1 circuit 17 via line 22 indicating whether or not a radio broadcast is being communicated.

The output from the demodulation circuit 18 is given to a first identification circuit 23 that detects and identifies the frequency f1, and a second identification circuit 24 that detects and identifies the frequency f2. The output of these Oribetsu times 1@23 and 24 is line 25.26
The signals are supplied to the processing circuit 21 via the respective channels.

The seven-piece clock loop frequency synthesizer 19 includes a reference frequency signal generation circuit 27, a frequency division circuit 28 that divides the oscillation frequency signal from the local oscillation circuit 15, and a reference frequency signal generation circuit 27 that divides the oscillation frequency signal from the local oscillation circuit 15.
A phase comparator circuit 29 that receives signals from the MM generator circuit 27 and the frequency divider circuit 28 and generates a voltage corresponding to the phase difference between those signals, and a low-pass filter 3o that smoothes the output voltage from the phase comparator circuit 29. including. -Frequency amplification circuit 14
The frequency of the tuned circuit of 15 is changed, and the frequency of the local oscillator circuit 15 is changed.
oscillation frequency changes. As a result, the phase of the base tf-frequency signal from the reference frequency borrowing generating circuit 27 is matched with the phase of the output from the frequency dividing circuit 28, resulting in a locked state. The frequency dividing ratio of the dividing circuit 280 is the same as that of the processing circuit 2 as described in IQ.
1 is changed by a signal via line 2o.

FIG. 2(1) shows the signal waveform demodulated by the demodulation circuit 18 of radio broadcasts emitted from the radio broadcast stations 1, 2.3. In the middle of radio broadcasting, a start identification signal 31,
2) The information 32 and the end identification signal 33 are emitted in this order. In the start identification signal 31, the frequency fl is maintained over the connection period W, paused for a period W2 during JQj, and a frequency &f different from the frequency f1 is maintained for a period W3 after the connection period W.
2 signals are sustained. In the end identification number 48 33, the frequency f2 is maintained for a duration W4, paused for a period W5, and then the frequency #, f1 is maintained for a period W6.

In this embodiment, W2=W5, W1=W3=W4=W6. The first clearance circuit 23 detects the frequency fl and derives a bias indicated by a second line (2) on the line 25. Further, the second discrimination rod 1 path 24 detects the frequency f2 and detects the line 2.
6, the signal shown in FIG. 2(3) is derived. When the processing circuit 21t/'i detects the starting pupil-specific No. 31,
A high level signal is derived to line 34 and passed through transistor 35 (3j+), thereby exciting relay coil 37 of relay 36. By excitation of the relay coil 37, the common contact 11 of the changeover switch 8 is switched to the individual contacts 10, and the four contacts are made. When the relay coil 37 is demagnetized, the common contact 11 is in communication with the individual contacts 9.

Communication scanning by the processing circuit 21 related to the tuner 7 will be explained with reference to FIG. Step ml to step m
2, the carrier frequency of the radio broadcast transmitted from the radio broadcast station 1, 2.3 to be received is determined. What is the carrier frequency of radio broadcasts that should be scanned? lf
, once runs over the entire frequency band that can be tuned in the high frequency amplification circuit 14 of the tuner 7, for example, the amplitude-adjusted medium wave band, and the ^ signal derived from the intermediate frequency amplification circuit 17 to the line 22 is preliminarily Memorizing carrier frequencies of radio broadcasts that exceed a specified levelV
A specific alternating frequency is preselected by C. In this manner, in step m4, the first timer starts clocking. The first timer sets a time T1 for each time the tuner 7 performs reception scanning of all receivable bands to detect and store the carrier wave number of a radio broadcast, so to speak, each time it is refreshed. For example, this time Tit:t may be about 10 minutes. For this reason, a receiving device that complies with Misfire 1 is installed in a car, and is able to communicate with high sensitivity and high quality while driving.Even when the electric field strength of radio broadcasting is poor, it can always receive and scan the best radio broadcasting. can do.

In step m5, radio broadcast stations 1, 2, .
A signal for setting a division ratio is provided from processing circuit 21 via line 20 to frequency dividing circuit 28 in order to communicate the carrier frequency of the first radio station l out of three. In step m6, the clocking operation of the second timer is started. In step m7, this second timer returns 1fjj T at a predetermined time.
It is determined whether or not a clocking operation has been performed.

The time T2 defined by this second timer is chosen to be sufficiently smaller than the duration W1 of the signal with the first frequency f1 contained in the start identification (No. 8 31), so that multiple radio station 1゜2.3
It is possible to perform communication scanning by going around the carrier wave frequency emitted from the transmitter. Therefore, radio stations 1 and 2 to be received
．． Assuming that there are a maximum of a stations in number 3, time T2 is selected so that the following equation holds.

When the second timer is performing a clocking operation, the process moves from step m7 to step m8, and the contents of the second timer are incremented by 1. In the next step m9, the first
It is determined in the timer whether a predetermined time T1, for example 10 minutes as described above, has elapsed, and if not, the process goes to step m12 and increments the contents of the first timer by 1 to perform a timing operation. In step mll, the frequency [fl
.

f2 is detected to identify the start identification (No. A 31 and the end Seibetsu signal 833).

When the clocking operation of the second timer is performed for a predetermined time T2 in step m7, the processing circuit 21 operates on the line in order to receive the carrier wave frequency from the radio broadcast station 2 following the radio broadcast station 10 in step m12. 2o
The I= sign that sets the frequency dividing ratio of the frequency dividing circuit 28e is H.
”I feel empowered.

The operation of the processing circuit 21 for identifying the start identification signal 31 and the end pupil identification signal 33 is shown in FIG. Moving from step n1 to step n2, it is determined whether or not there is a signal of frequency &f1 in order to detect the first starting detailed value number 31. If there is, the process moves to step n3, and whether traffic information 32 is being communicated or not. No, that is, the flag FT included in the processing circuit 21 is on! 1
If not, the process moves to step n6 to stop communication scanning and continue to receive one radio broadcast station 1, 2 or ld3. In step n7, the third timer starts counting. This third timer is set to 1' at a predetermined time!
The clock operation is performed by 1JW2.

After the signal of frequency f1 included in the start identification signal 31 is detected in this manner, a period w2 in which there is no audible frequency signal is detected as follows.

The process moves from step n2 to step n9, and if the frequency f2 is not detected, the process moves to step n19. It is detected whether or not the third timer is in the process of counting, and if so, step n
Move to 20. It is determined whether the third timer has finished counting, and if not, the counting operation of the third timer is continued in step n21.

Next, in order to detect the frequency f2 of the start identification signal 31, the process moves from step n2 to step n9.

When the frequency f2 is detected, it is determined in step nlO whether the flag F1 is off, and if so, the clocking operation of the third timer is set to 1 in step nil, and the flag FT is turned on in step n12. and instructs to operate the traffic information 32. As a result, in step n13, the common contact 11 of the 9J changeover switch 8 is changed to the individual contact 10, and the traffic information 32 from the tuner 7 can be transmitted from the speaker 13. In step n14, flag F1 is turned on.

During the operation of receiving the traffic information 32, steps n2-n9.
The operation n19 is performed.

The operation when detecting a signal having the frequency 12 of No. 33 will be described. Step R2 moves to step n9, and step nl
If flag F1 is detected not to be off at step n15, another 7-lag F'2 is turned on, and flag F1 is turned off at step n16. In step n17, the clocking operation of the 3 timers is started, and in step n18, the flag F1 is turned off.

During the period W5 in which the iJ 藺igo wave color included in the end pigment signal 33 is not generated, step n2.
n9. n 19. n 20. Tracing the side effects of n21. Frequency f1 included in example phrase 33 by completed job
is extracted in step n2, it is determined in step n3 that the communication of the father-to-home information 32 has ended, that is, it is detected that the flag FT is on. As a result, the flag FT is turned off in step n4 and 1. In step 115, the common Jllll contact 11f1 of the changeover switch 8 is exclusively traced to the individual contact 9. In this way, radio broadcasts communicated by the tuner 6 can be covered.

Start Seibetsuso 831, traffic information 32 and end tumor number 3
Step n2. n9. n
Follow steps j9 and n20. The clocking operation of the third timer has finished! If TII is disconnected, the process moves to step n22, where it is determined whether traffic information is being exchanged. If not, the process moves to step n23, where all flags F'r and Fl are set.

Turn off F2. In step n24, statement 11 is made so that the transmission direction wave number of the next radio broadcast can be communicated.
Start scanning. At this time, the common contact 11 of the changeover switch 8 is connected to the individual contact point 9 in step n25,
The tuner 6 performs normal alternating current production. In addition, when the third timer finishes counting in step n20 while the debt information 320 is being received, it is determined in step n22 whether or not the statement of X111 information @132 is in progress.
If so, it is determined whether the flag F2 is on or not in step n26. If the flag F2 is on, the process moves to step n27, where the 7-lag F2 is turned off, and at step n28, the flag Flk is turned on. In this way, the end identification signal 33 enters the preparation state.

The time counted by the third timer is extremely short compared to the Kc period of the traffic information 32, and therefore the traffic information 32
During the receiving operation, step n2. n9゜n19. n2(
1, n22. n26. n27. The progress of n28 and n8 will be followed.

As described above, according to the present invention, it is possible to actually listen to traffic information included in a plurality of radio broadcasts.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of one embodiment of the zero-starter J, Fig. 2 is a waveform diagram explaining the operation of the Mugid device shown in Fig. 1, and Figs. 3 and 4. Figure 1 shows the untidy hall'l1.
-1 Explain the operation of the loading waste L! I] This is a flowchart. 1.2.3... Radio broadcasting station, 4... Antenna, 5
...Demultiplexing time 1^S, 6.7...Tuner, 8...
Changeover switch, 12...Amplification circuit, 13...Speaker, 14...Sieve ll8il wave amplification circuit, 15...
Phase lock loop same wave number synthesizer, 16...
・Mixing circuit, 17...Intermediate frequency amplification circuit, 18...
・Demodulation circuit, 23...first Seibetsu circuit, 24...second
Seibetsu Circuit Agent Patent Attorney Kei Nishi

Claims (1)

[Claims] A start identification signal, traffic information, and an end identification signal are sent out in this order by each of the plurality of radio broadcasts, and the start identification signal sequentially sends out signals having a plurality of mutually different predetermined frequencies. When receiving and scanning multiple radio broadcasts in one cycle during the duration of the first frequency signal included in the start identification signal, and detecting the first frequency signal included in the start identification signal, the tuned frequency is maintained. to stop the reception scanning and detect the remaining part of the 7-hi starting identification signal in relation to time following the first frequency signal to identify the starting identification signal, thereby audible traffic information, and to identify the ending identification signal. A radio traffic information reception method characterized by performing reception scanning again upon detection.