KR920004588B1 - Traffic information broad casting tunning circuit for car stereo - Google Patents

Abstract

The circuit includes a control section (7) for switching the car radio to a traffic broadcasting mode, for issuing a warning under an abnormality, and for displaying the current status. A signal switching section (5) switches the system from a broadcasting status to a warning mode, or the other way, in accordance with the control signals of the control section (7). A muting section (8) removes the noises which are generated during a switch over, in accordance with the control signals of the control section (7). An automatic sound adjusting section (9) automatically adjusts the sound volume of the traffic broadcast. With the circuit, a convenience is provided to the user by issuing a warning under an abnormality.

Description

Caster's Traffic Information Broadcasting Circuit

1 is a block diagram of the present invention.

2A-C are control flowcharts of the present invention.

* Explanation of symbols for main parts of the drawings

1: Switch for traffic information broadcasting station 2: Antenna

3: tuner 4: IC for traffic information broadcasting

5: signal switching unit 6: LCD display unit

7: control unit 8: muting unit

9: automatic volume control unit 10, 11: amplifier

According to the present invention, when a button for traffic information broadcasting is selected, regardless of a reception band, the signal is automatically tuned to detect a traffic information broadcasting signal, and automatically generates an alarm when a traffic information broadcasting station signal is not detected for a predetermined time. It relates to a traffic information broadcasting circuit of a car stereo that informs a user of a status and then re-selects to keep searching for a traffic information broadcasting station.

In the conventional broadcast broadcasting circuit of the car stereo, there is a drawback that no automatic tuning operation is performed in the state of the alarm sound or the alarm sound continues.

Accordingly, an object of the present invention is to provide a traffic information broadcasting tuning circuit of a car stereo for automatically generating a tuning state after generating an alarm sound when the broadcasting contents cannot be received within a given time.

In order to achieve the above object, the present invention provides a traffic broadcasting tuning circuit of a car stereo having an electronic tuner and an IC for traffic information broadcasting station for detecting a traffic information broadcasting station signal and a traffic information broadcasting signal. If the traffic information broadcasting station signal is input for a predetermined first time while listening to the radio while the switch for broadcasting station is turned on, the radio mode is switched to the traffic information broadcasting mode, and the traffic information broadcasting station signal is detected within the first time. If not, the controller generates an alarm sound for a predetermined second time and simultaneously generates a control signal indicating a current state, and operates by a control signal of the controller to switch alarm sound and traffic information broadcast contents. It is generated when the mode is switched by operating by the signal switching unit and the mute signal generated by the control unit Is composed of a muting unit for removing noise and an automatic volume control unit for automatically increasing the volume of the traffic information broadcast signal by operating by the traffic information broadcast signal.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a circuit diagram for selecting a broadcast station for traffic broadcasting. In the present invention, when the switch 1 for traffic information broadcasting tuning is pressed regardless of a reception band, the present invention enters an automatic tuning state and detects a traffic information broadcast signal SK. When the information broadcasting station signal SK is not detected, an alarm sound is automatically generated for 3 seconds to inform the user of the status, and then the station is re-selected so that the traffic information broadcasting station can be continuously found.

The broadcast signal passing through the antenna 2 and the tuner 3 is applied to the traffic information broadcasting tuning IC 4 and to the signal switching unit 5 at the same time. When the switch 1 for traffic information broadcasting tuning in the traffic information broadcasting tuning IC 4 is pressed, the " SDK " character is displayed on the LCD display unit 6 under the control of the control unit 7. At this time, the control unit 7 automatically selects.

If the traffic information broadcasting station signal SK is detected while listening to the radio, the controller 7 determines whether the signal SK is detected for 25 seconds by a counter configured therein. If the SK signal is detected within 25 seconds, the control unit 7 generates an alarm recognition control signal ALCON and a mute signal MUTE and prepares to listen to traffic information broadcast, and at the same time, the resistor 8A and the condenser ( The output signal muting section 8 composed of 8B) and transistor 8C is operated. The control unit 7 also controls the LCD display unit 6 to display the "SK" character.

If the traffic information broadcast signal DK is detected in this way, the controller 7 releases the muting and listens to the traffic information broadcast. That is, the traffic information broadcast signal tuned by the tuner 3 is automatically adjusted by the automatic volume control unit 9 through the signal switching unit 5, and then the speaker (not shown) through the amplifier 10. Will be printed). Herein, the automatic volume control unit 9 automatically increases the volume by the traffic information broadcast signal DK even when the volume is minimum.

However, if the traffic information broadcasting station signal SK is not detected within the above 25 seconds, the control unit 7 automatically stops automatic tuning for 3 seconds and generates an alarm sound for 3 seconds to generate an alarm recognition control signal. ALCON amplifies through the amplifier 11 and the signal switching unit 5 to be output to the outside, and after 3 seconds to return to the initial state again to perform automatic tuning.

2a-c show a flowchart of the control unit according to the present invention. First, when listening to a radio regular broadcast and turning on the traffic information broadcast tuning switch 1 (step 101), the control unit 7 When the switch 1 is turned on (step 102), the control unit 7 displays the traffic information broadcasting station signal "SDK" on the LCD display unit 6 (step 103). The current state is stored in its internal memory (step 104), and then applied to the output signal muting section 8 to mute the radio signal outputted with the mute signal MUTE high (step 105). The broadcast band is automatically changed to FM (step 106).

If the traffic information broadcasting station signal SK is not detected after such mode switching (step 107), the control unit 7 checks whether the traffic information broadcasting station switch 1 is turned off (step 108), and the switch 1 ) Is off, the " SDK " displayed on the LCD display unit 6 is turned off (step 109), the broadcast mode is returned to the radio normal broadcast mode, and the MUTE signal is released to release the radio normal broadcast. Listen (steps 110-112).

However, if the switch 1 for traffic information broadcasting station is not turned off (step 108), the control unit 7 continues automatic tuning (step 113). At this time, the counter inside the control unit 7 stops. Will be counted. That is, the counting operation starts from the time when the traffic information broadcasting station switch 1 is turned on (step 114). If the traffic information broadcasting station signal SK is not detected (step 115), the counter continues counting. (Step 116).

If 25 seconds have not elapsed while continuing the count, the program returns from step 117 to step 115 to increase the duration count. However, when 25 seconds have elapsed while the traffic information broadcasting tuning switch 1 is turned on, the control unit 7 stops automatic tuning, releases muting, and generates an alarm sound (step 120).

At this time, another counter inside the control unit 7 counts the time at which the alarm sound is generated (step 121). If the alarm sound has not elapsed for three seconds, the program continues to increase so that the count continues to increase. The process returns to step 122 via step 123.

However, if the alarm sound continues for 3 seconds, the control unit 7 releases the alarm sound and at the same time turns on the MUTE signal to remove pop noise generated at this time (steps 124 and 125). Returning to step 108 from 125, the state of the traffic information broadcasting station switch 1 is monitored.

On the other hand, when the traffic information broadcasting station signal SK is detected (step 115), automatic tuning is stopped (step 126), and the character "SK" is displayed on the LCD display unit 6 (step 127). Further, even when the traffic information broadcasting station signal SK is detected as a result of the determination in step 107, the character "SK" is displayed on the LCD display unit 6.

When the traffic information broadcasting signal DK is detected after the traffic information broadcasting station signal SK is detected, the program proceeds from step 128 to step 129 where the "DK" character is displayed on the LCD display unit 6 and at the same time. The control unit 7 releases the muting (step 130), and the automatic volume control unit 9 automatically increases the volume by the traffic information broadcast signal DK (step 131).

If the traffic information broadcast signal DK is not detected in this way (step 132), the automatic volume returns to the original volume setting value (step 133), the traffic information broadcast state is canceled, and muting is applied and the LCD display unit 6 ), The " SK " character signal displayed in "

The program then proceeds from step 136 to step 108 to repeat the above process.

According to the present invention operating in this manner, pressing the SDK switch irrespective of the reception band, the automatic tuning state is detected, and the SK signal is detected. When the SK signal is not detected for more than 25 seconds, an alarm sound is automatically generated for 3 seconds to inform the user. After being informed, the station is re-tuned to find traffic information stations.

Claims (1)

A traffic information broadcasting station circuit of a stereo, which has an electronic tuner and an IC for traffic information broadcasting station for detecting a traffic information broadcasting station signal and a traffic information broadcasting signal; When the traffic information broadcasting station signal is input for a predetermined first time while listening to the radio while the switch for the traffic information broadcasting station is turned on, the radio mode is switched to the traffic information broadcasting mode and the traffic information broadcasting station signal is switched to the first time. A control unit for generating an alarm sound for a predetermined second time and generating a control signal for indicating a current state if it is not detected therein; A signal switching unit for operating the control signal generated by the control unit to switch the alarm sound and the traffic information broadcasting contents; A muting unit for removing pop noise generated during mode switching by operating by a muting signal generated by the control unit; And an automatic volume control unit configured to operate by the traffic information broadcast signal to automatically increase the volume of the traffic information broadcast signal.

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