JPS60136427A - Tuning system of electronic tuning car radio - Google Patents

Abstract

PURPOSE:To facilitate receiving road-side information by depressing a service request button provided in a car radio of the system, where digital quantities for tuning are stored and channels are selected with push buttons, to receive roadside information. CONSTITUTION:Digital quantities corresponding to tuning frequencies are stored in the electronic car radio. When a desired button on a key matrix KMX connected to a control part CONT is depressed to select a channel, a local oscillator LO is controlled by a PLL so that a local oscillated frequency for one wave of FM or AM is generated. A button which selects 1,620kHz frequency for roadside traffic information service is added to channel selecting buttons. The broadcast which is received just before depression of this button is received again a prescribed time after depression of this button or by the operation of a return button. If this button is depressed continuously, the receiving frequency is switched to stand-by frequency 1,629kHz. In this case, the original broadcast is received after a prescribed time. Thus, road side traffic information repeated in a short time is received easily.

Description

DETAILED DESCRIPTION OF THE INVENTION (Within the Technical Field of the Invention) The present invention relates to a tuning system for an electronically tuned car radio that can receive roadside traffic information in addition to general broadcasts.

BACKGROUND OF THE INVENTION Recently, a roadside traffic information service is about to be started in which a radiator such as a leaky cable is installed along the roadside of a specific road to provide road traffic information to traveling vehicles.

Those who wish to receive this service must find a sign indicating the service area and tune the general broadcasting frequency to the specific frequency for the service, but finding the sign may be delayed or Even if this problem is detected early, if the driver is unable to take his hands off the wheel and the operation of the same fJl is delayed, there is a risk that the service will be missed. In particular, since the service frequency is on the high frequency side outside the general AM broadcasting frequency band, tuning operations tend to be time-consuming. In addition, the service frequency is, in principle, 1620 KHz, but a reserve frequency of 1629 KHz is planned to be used in case the radio wave conditions are poor (4), so if it is not possible to tune to the former frequency, the reserve frequency will be used. It is necessary to try to synchronize it to , which makes the synchronization operation even more time-consuming.

The preset button that has been used in the past has been changed to 162 OKhz.
By adding two buttons for 1629Khz and 1629Khz, tuning operations can be performed easily and quickly, but the number of preset buttons on current car radios has already reached its limit, so it is quite difficult to add new buttons. be. Furthermore, even if a pre-cent button could be added, if the service area sign is overlooked, the opportunity to receive service will still be missed.

Purpose of the Invention The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to eliminate the need for adding a precent button,
To provide a car radio capable of receiving roadside traffic information service for a predetermined period of time with simple operation.

Structure of the Invention The first invention to achieve the above object is to sequentially generate 1620KH depending on the number of times one service request button (5) is pressed.
Along with tuning to z and 1629KHz.

If a predetermined period of time has elapsed after tuning or if a return to the original broadcasting frequency is requested before the predetermined time has elapsed, the original broadcasting frequency is restored.

A second invention that achieves the above object provides that when a predetermined period of time has elapsed since the change in the digital amount for tuning, or when a service request is made again before the elapse of the predetermined time, the digital amount for tuning is transmitted to the roadside traffic information service. from one that corresponds to the frequency for the roadside traffic information service to one that corresponds to the reserve frequency for the roadside traffic information service; if a predetermined period of time has elapsed since the change in the digital amount for tuning, or if a further service request is made before the predetermined period of time has elapsed. If there is, the tuning digital quantity is returned to the value before the first service request was made.

Further details of the present invention will be explained below using examples.

Embodiment (6) of the invention FIG. 1 is a block diagram of an electronically tuned car radio to which an embodiment of the invention is applied. This electronically tuned car radio stores digital quantities corresponding to each tuned frequency, reads out the corresponding digital quantity based on a tuning designation from the outside, and operates a phase-locked loop based on the successive digital quantities. It is configured to perform channel selection by changing the frequency division ratio, and includes an FM receiving section FM and an FM receiving section AM.

Phase-locked loop circuit PLL, display circuit DIS.

Display drive circuit DDR, switch SW, audio amplifier circuit AA, control circuit C0NT that controls the operation of these parts
and a key matrix KMX for inputting control commands to the control circuit C0NT.

The FM receiving section FM and the AM receiving section AM include a radio frequency amplifying section RF, local oscillators 1, 0 . <It is composed of a mixer MIX and an intermediate frequency amplifying section IF, and a frequency discriminator DISC and a detector DBT, respectively. Control circuit C0N
T reads the preset channel selection number etc. from the key matrix KMX (7) and calculates the frequency division ratio N of the 4-digit digital quantity corresponding to these.
Corresponding channels displayed as 1 to N4.

reads the frequency from the memory and supplies it to the reactor lock loop circuit PLL. Upon receiving this signal, the phase-locked loop circuit PLL controls the oscillation frequency of the local oscillator L0 using a known phase-locked loop via a low-pass filter LPF. When tuning is completed by the tuning process, the control circuit C0NT is transmitted from the intermediate frequency amplifier IF via the OR gate OR.
A notification of the end of synchronization will be sent. The respective outputs of the FM receiving section FM and the AM receiving section AM are supplied to the speaker SP via a switch SW switched by an AM/FM switching signal and an audio amplification circuit AA. The control circuit C0NT sends a signal indicating whether the signal being selected is FM or AM, and 4-digit digital display signals D1 to D4 corresponding to the above-mentioned N1 to N4 to the display circuit DIS via the display drive circuit DDR. supply to. In addition, the control circuit C0NT also controls the FM
When M is not selected either, a digital signal indicating the time and a signal indicating that the time display is selected (8) are output to the display circuit DIs via the display drive circuit DDR.

FIG. 2 is a conceptual diagram showing an example of the types and arrangement of push buttons of the key matrix KMX in FIG. 1.

The meaning of each push button in the figure is as follows.

A S U (Auto 5 search Up): Automatic upward channel selection A S D (Auto 5 search D
own): Automatic downward channel selection MSU (Manual
5earch Up): Manual upward channel selection M S D
(Manual 5arch Down): Manual downward tuning CHI to CH5 nib reset tuning (memory tuning)
Channel number Reject (Rejection): Rejection of specific frequency Write: Update trigger of precent contents R
ecall r Roadside traffic information service request Retur
n: ffi Return Whether or not each push button in each row is pressed is scanned and read by the control circuit C0NT at each timing T1 to T4.

3, 4, and 5 are a time chart and a flowchart for explaining the operation of the embodiment (9) shown in FIG. 1.

First, the control operation of C0NT is started by turning on the power,
In block 1, initialization of RAM, I10 board, etc. is performed. Next, the process proceeds to decision block 2, where it is determined whether or not the interval timer has elapsed. As shown in the time chart of FIG. 3, this interval timer is a clock pulse with a constant period (for example, 1 ms). After waiting for the timer to pass, the process proceeds to block 3, where the five timing signals T1 to T shown in FIG.
Raise all 5 to high. Next, move on to Pro Tsuk 4.

Here, it is determined whether the timing signal T5 is low. Immediately after the start of operation, the timing signal T5 is high, so the process advances to block 5, where the first digit N1 of the four-digit frequency division ratio N is input from the controller.
Output to. Next, in the block 6, the first timing signal T1 is brought down to low, and in the primary block 7, the display segment signal D1 corresponding to N1 is outputted (IO) to the display drive circuit DDR.

In the next block 8, information ASU-MSD to be read when timing T1 is low is read from KMX,
This is stored in RAM. In block 9, the process waits for the interval timer to elapse, and then proceeds to decision block 10, where it is determined whether or not there is a command for one-display dimming. If a command to dim the display had been issued.

In block 11, the timing signal T1 is raised to high and the one display segment signal DI is turned off, and then the process moves to block 11 to count and amplify the timing signal. On the other hand, if a command for dimming by one display has not been issued, the process moves directly from block 10 to block 12. Thereafter, the process returns to block 2, waits for the interval timer to elapse, and then proceeds to block 3, where the timing signal T2 is raised to low. Similarly, when the N values and the corresponding display segment signals from block 2 to block 12 have been output from the first digit to the fourth digit, the timing signal T5 falls to low in block 3. Control is transferred from decision block 4 to decision block 13 .

In decision block 13, it is determined whether or not the car radio is in the on state, and if it is not in the on state, a mute output is performed. If the car radio is in the on state, it is determined in block 14 whether or not it is in the on state for the first time, and if it is likely to be in the on state, predetermined channel selection processing is performed. If it is not the first on state, the process moves to block 15, where it is determined whether or not the ASU push button has been pressed down, and if it has been pressed down, a predetermined search process is performed, and if not, the process moves to the next block.

Thereafter, while performing similar push button determination and processing (blocks in the middle are omitted), in block 16, it is determined whether or not the push buttons of precent channel selection channel numbers CHI to CH5 are in the on state, and Performs reception of corresponding tuning presets for those in .

The process then proceeds to block 17 of FIG. 5, where the count value of the status counter is determined. This state counter is provided in the control circuit C0NT, and its count value is the sixth state counter.
As shown in the figure, the service request push button (Ilecall)
When the service request button is pressed for the first time, the value changes from "0" to "1" by the program, and when the service request button is subsequently pressed, the value changes from "1" to "2". When a predetermined period of time elapses after the count value reaches "1" or "2", it returns to "0".

Also, if the return request push button (Return) is pressed while the count value is in the state of "1" or "2", 1
Return to 0''.

If the count value of the status counter is "1", the process proceeds to block 18, where it is determined that the frequency being received is 1620 KHz.
Determine whether or not. The frequency being received is 1620
If it is not KHz, the process proceeds to block 19, where the frequency division ratio N corresponding to the frequency currently being received is saved from the output register to the save register. Next, in block 2O, the frequency division ratio N corresponding to 1620 KHz is read from the memory and set in the output register, and in block 21, after starting a timer for determining a predetermined receiving time,
Return to block 2 in FIG. The new frequency division ratio N set in the output register is outputted from the control circuit C0NT to the phase-locked loop PLL by the operation shown in FIG. 4 described above.

In block 18, the frequency currently being received is 1620.
If it is KHz, the process advances to block 22, where it is determined whether the timer activated in block 21 has time-amplified. If time amplification is not performed, the process returns to block 2 in FIG. On the other hand, if time amplification has been performed, proceed to block 23.

After the original frequency division ratio N saved in the save register in block 19 is sent to the output register, block 2 in FIG.
Return to The original divide ratio N sent to the output register is
By the operation shown in FIG. 4 described above, the control circuit C0NT outputs to the phase-locked loop PLL, and the broadcasting frequency that was being received before the roadside traffic information reception service was requested is received again.

In block 17, the count value of the status counter is 2″
If it is determined that the frequency is 1629 KHz, the process moves to block 24, where it is determined whether or not the current frequency is 1629 KHz. If it is not 1629 KHz (14), the division ratio N corresponding to 1629 KHz is read from the memory and placed in the output register, and after starting a timer for determining a predetermined receiving time in block 26,
Return to block 2 in FIG.

The new divide ratio N written into the output register is:

By the operation shown in FIG. 4 described above, the signal is output from the control circuit C0NT to the phase-locked loop PLL.

On the other hand, the frequency currently being received in block 24 is 16.
If it is determined that the frequency is 29 KHz, the process moves to the aforementioned determination block 22, and it is determined whether or not the timer started by the programmer 26 has timed the amplification. If there is a time up, the broadcasting frequency remains the same; if the time is amplified, the original broadcasting frequency is restored in block 23, and then the process returns to block 2 in FIG. 4, respectively.

In block 17, the count value of the status counter is 0''
If it is determined that this is the case, the process moves to 3-pro-tsuk 27. In block 27, a return request push button (Return) is pressed just before
It is determined whether or not n) has been pressed. When the return request push button is pressed, a flag is set to indicate that the push button has been pressed for a predetermined period of time.

If it is determined by this flag that there was a press just before, the process proceeds from block 27 to block 2, and in block 19, the division ratio N corresponding to the original broadcasting frequency saved in the save register is sent to the output register. set. On the other hand, if it is determined in block 27 that the return request push button was not pressed immediately before, the process directly returns to block 2 in FIG.

FIG. 7 is a state transition diagram for explaining another embodiment of the present invention. When the service request button (Recall) is pressed for the first time, it changes from "0" to 1 by the program, and when the service request button is pressed again or a predetermined period of time elapses without pressing the service request button again. “From 1゛ to 2′. When a predetermined period of time elapses after the count value reaches 2'', it returns to 0.Furthermore, if the return request button (Return) is pressed while the count value is in the state of 1 or 2, Returns to "0". In order to perform such an operation, block 23 can be deleted from the flowchart of FIG. 5, and the modification can be made so that when it is determined in block 22 that time-up has occurred, the process moves to block 25.

FIG. 8 is a state transition diagram for explaining still another embodiment of the present invention. Service request push button (Reca II
) changes from “O” to “1” by the program when pressed for the first time, and changes from “1” to “1” when the service request button is pressed again or after a predetermined time elapses without pressing the service request button again. It becomes “2”. If the service request push button is pressed again after the count value reaches "2" or a predetermined period of time elapses without it being pressed, the count value becomes 0.
Return to If necessary, press the return request button (Return).
), and when the return request push button (Return) is pressed while the count value is in the state of ``1'' or ``2'', it may return to 0''.

Effects of the Invention As explained in detail above, the present invention is capable of sequentially tuning to 1620 KHz and 1629 KHz (17) depending on the number of times one service request push button is pressed. It is configured to quickly tune to the service frequency and automatically return to the original broadcasting frequency after a predetermined period of time after tuning, reducing roadside traffic information with repeated short announcements to the bare minimum. It has the advantage of being audible within a range of

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the configuration of an electronic handheld car radio to which an embodiment of the present invention is applied, FIG. 2 is a diagram showing an example of the types and arrangement of push buttons of the key matrix KMX in the first embodiment, and FIG. 1 is a time chart showing an example of the operation of the electronically tuned car radio of FIG. 1; FIGS. 4 and 5 are flowcharts for explaining the operation of the electronically tuned car radio of FIG. 1;
6 to 8 are state transition diagrams for explaining the present invention in detail. FM...FM receiving section, AM...AM receiving section, PLL...
Phase lock loop, DIS...display circuit, DDR...display drive circuit, SW...switch. (18) AA...audio amplification circuit, C0NT...control circuit,
KMX...Key matrix, RF...Radio frequency amplifier, LO...Local oscillator, MIX...Mixer, IF...Intermediate frequency amplification section, Disc...Frequency discriminator, DET...
Detector, LPF...Low pass filter. Patent applicant Fujitsu Ten Ltd. Agent Patent attorney Gobe Tamamushi (1 other person) (19) Figure 2 JP-A-136427 (7) Figure 3 Figure 5 Figure 6 Figure 7 Figure 8 Cause

Claims (2)

[Claims] (1) Store the tuning digital amount corresponding to each tuning frequency, read out the corresponding tuning digital amount based on the tuning designation from the outside, and use the successive tuning digital amounts to adjust the phase. In the tuning method of electronically tuned car radios, which selects stations by changing the frequency division ratio of the synchronization loop. As tuning digital quantities, values corresponding to a general broadcasting frequency, a frequency for roadside traffic information service, and a subsidiary frequency of the frequency for roadside traffic information service are stored. When there is a service request to receive roadside traffic information service, the tuning digital amount is changed from one that corresponds to the general broadcasting frequency being received to one that corresponds to the frequency for roadside traffic information service. If a predetermined time has elapsed since the change in the tuning digital amount or before the predetermined time has elapsed, (1) If a return request is made, return the tuning digital amount to the value before the service request was made. If a service request is made again before the predetermined time has elapsed after the tuning digital amount is changed, the tuning digital amount is changed from the one corresponding to the frequency for roadside traffic information service to the frequency for roadside traffic information service. If a predetermined period of time has elapsed since the change in the digital amount for tuning, or if a return request is made before the predetermined time has elapsed, the digital amount for tuning will be changed to one that corresponds to the frequency of the first service request. A tuning method for electronically tuned car radios that is characterized by returning to the original state. (2) Store the tuning digital amount corresponding to each tuning frequency, read out the corresponding tuning digital amount based on the tuning designation from the outside, and use the successive tuning digital amounts to perform phase synchronization. In the tuning method of electronic synchronized car radios, which selects stations by changing the frequency division ratio of the loop. As tuning digital quantities, frequencies corresponding to general broadcasting frequencies, frequencies for roadside traffic information services, and spare frequencies for the roadside traffic information services (2) are stored. When there is a service request to receive roadside traffic information service, the public digital quantity is changed from one that corresponds to the general broadcasting frequency currently being received to one that corresponds to the frequency for roadside traffic information service. If a predetermined period of time has elapsed since the tuning digital amount was changed, or if a service request is made again before the predetermined time has elapsed, the tuning digital amount is changed from the one corresponding to the frequency for roadside traffic information service to the roadside traffic information. Change the service frequency to one that corresponds to the backup frequency. If a predetermined time has elapsed since the change in the digital amount for tuning, or if there is another service request before the predetermined time has elapsed, the digital amount for tuning is returned to the value before the first service request was made. A tuning method for electronically tuned car radios.