KR960002665B1 - Traffic information broadcasting controlling device of car audio - Google Patents

Abstract

The control method of a traffic information broadcasting control device in a car audio by using a signal meter voltage change of an FM IF unit comprises the steps of selecting a radio or a tape; if a radio is selected, determining if a traffic information key is input; if not, operating as a last radio mode and if the traffic information key is input, starting an auto tuning and determining if a signal meter is over A level; if not, starting an auto tuning and if the signal meter is over A level, determining if a traffic broadcasting perception signal is over A level; if not, starting an auto tuning and if the traffic broadcasting perception signal is over A level, stopping the auto tuning and receiving a traffic information broadcasting; if a tape is selected, driving the tape and determining if the traffic information key is input; if not, driving the tape and if the traffic information key is input, starting the auto tuning and determining if the signal meter is over A level; if not, driving the tape and if the signal meter is over A level, determining if the traffic broadcasting perception signal is over A level; if not, driving the tape and if the traffic broadcasting perception signal is over A level, stopping the auto tuning and determining if the traffic broadcasting output signal is over A level; if the traffic broadcasting output signal is over A level, turning off the tape and determining if the signal meter is over B level; if not, driving the tape; and if the traffic information standby mode is off during the tape driving, operating the tape mode and if not, determining the level of the signal meter.

Description

Control Method of Traffic Information Broadcasting System of Car Audio Using Signal Meter Voltage Variation of Middle Frequency (FM) Part of FM

1 is a waveform diagram of on / off level characteristics of traffic information broadcasting according to the prior art.

2 is a block diagram of a car audio traffic information broadcasting control apparatus using a signal meter voltage change of the FM middle frequency unit for the present invention.

3 is a waveform diagram of on / off level characteristics of traffic information broadcasting according to FIG. 2;

4 is a diagram illustrating the relationship between the electric field strength and the signal meter with respect to FIG.

5 is a flowchart illustrating a control method of a car audio traffic information broadcasting control apparatus using a signal meter voltage change of an FM medium frequency unit of the present invention.

* Explanation of symbols for main parts of the drawings

1: tuning unit 2: amplification and detection unit

3: traffic broadcasting detection unit 4: controller

5: Key Matrix 6: Display

7: multiplexer

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to the reception of traffic information broadcasting according to electric field strength in car audio equipped with a receiver for traffic information (SDK) broadcasting or radio data system (hereinafter referred to as RDS) broadcasting. The control method of the car audio traffic information broadcasting control device using the signal meter voltage change of the middle frequency part of the FM M so that the traffic information broadcasting can be stably received even when the electric field strength of the traffic information broadcasting changes irregularly while listening to the sound. It is about.

Conventionally, when a user listens to a tape in a car audio equipped with a receiver of a traffic information (SDK) broadcast and presses a traffic information standby key, the traffic information waits, and as shown in FIG. When the broadcast is received more than a certain field strength, the traffic information broadcast sound comes out.

However, such a conventional technique is a tape in the traffic information broadcasting sound when the on / off level of traffic information broadcasting is the same and the electric field strength is irregularly repeated above or below the on / off level due to regional characteristics such as buildings or mountains. As traffic information broadcasting was changed on and off irregularly, it was impossible for the listeners to receive stable traffic information broadcasting. To solve this problem, traffic signal output on / off delay circuit using hysteresis should be additionally installed. There was a problem of rising production costs.

In view of such a conventional problem, the present invention is characterized in that the traffic information broadcasting can be stably received by setting the off level lower than the on level even when the electric field strength of the traffic information broadcasting changes irregularly.

When described in detail with reference to the drawings as follows.

As shown in FIG. 2, the apparatus for controlling traffic information broadcasting of car audio using a signal meter voltage change of the F M middle frequency unit for outputting in a resonant state by changing a frequency received through an antenna ANTI is shown in FIG. 2. Tuning unit 1; An amplifying and detecting unit 2 which amplifies the output of the tuning unit 1 and rectifies and outputs extracted signal meter information; A traffic broadcasting detector (3) for detecting traffic information broadcasting among the signals detected by the amplification and detector (2); A controller (4) tuned to the oscillation frequency of the tuning unit (1) for controlling and outputting the signal meter output of the amplifying and detecting unit (2) or the output signal of the traffic broadcasting detecting unit (3); A key matrix 5 for inputting a key to select a control operation of the controller 4; A display unit 6 for displaying a control operation of the controller 4; The multiplexer 7 outputs an audio signal through the left and right speakers by multiplexing the output of the amplification and detection unit 2.

The device configured as described above is almost the same as a conventional device using a position detector instead of a signal meter, but a signal meter must be used to implement the operation according to the present invention.

The operation and effects of the present invention as described above will be described in detail with reference to FIGS. 3 to 5 below.

When the traffic information (SDK) standby key (Key by Stand) is input in the key matrix 5 while listening to the tape sound, auto tuning is started to amplify and detect when the electric field strength of the traffic information broadcast is A or more. The signal from the signal meter (hereinafter referred to as SM) signal of negative part 2 is Level is set, and the traffic broadcasting signal SK, which determines whether the traffic broadcasting station 3 is a traffic broadcasting station, is output, and the signal meter SM terminal and the traffic broadcasting recognition SK terminal of the controller 4 are driven. By being active, the automatic tuning is stopped and the traffic information is waited.

Here, since the tape deck device (Tape Deck Mechanism) is attached to the tape, the sound of the tape comes out during the traffic information automatic tuning and the traffic information standby state.

At this time, when the traffic broadcasting output signal DK is input to the controller 4 from the traffic broadcasting detecting unit 3, the traffic information operation mode (On Mode) becomes a tape sound and the traffic information broadcasting sound comes out. .

On the other hand, when the field strength is above A and traffic information broadcasting is received, as shown in FIG. 3, the traffic information broadcasting is maintained until the field strength becomes less than or equal to B.

Here, looking at the relationship between the electric field strength and the signal meter SM of the amplifying and detecting unit 2, as shown in FIG. 4, when the input electric field strength is increased, the voltage output from the signal meter becomes high, thereby causing the controller (4). ), The driving voltage input to the circuit becomes high.

At this time, the controller 4 To the level at which traffic information is turned on, Recognize the point as the level at which traffic information is turned off.

therefore, By maintaining the traffic information broadcasting by the traffic information broadcasting turn-off level of the point, it is prevented from switching from the tape sound to the traffic information broadcasting sound.

Selecting the radio or the tape when the power is applied, as shown in FIG. When the radio is selected, enters the last radio mode to judge whether there is a traffic information key input (1B); If there is no traffic information and input, it operates in last radio mode, and if there is traffic key input, it starts auto-tuning and the signal meter Determining whether it is at or above the level (IC); Signal meter If it is not above level, auto tuning starts and the signal meter If the level is above, the traffic signal Determining whether the level is equal to or higher than level 1D; If the signal is a traffic broadcast If it is not above the level, auto tuning is performed. Receiving traffic information broadcast after stopping automatic tuning (1E) if the level is higher than the level; If the tape is selected in step (1A), the tape is driven, and if there is a traffic information key input, automatic tuning is started so that the signal meter Determining whether the level is equal to or higher than level 1G; Signal meter If it is not above level, drive the tape and the signal meter If the level is higher than the traffic broadcast signal Judging whether the level is equal to or higher than level (1H); Traffic broadcast signal If the level is not above, drive the tape and the traffic signal If the level is over, auto tuning stops and traffic information is in standby mode. (1I) for determining whether the level is higher than or equal to; Traffic broadcast output signal If the level is not higher than the traffic information standby mode, the traffic signal output signal is If the level is higher, the tape is turned off and the traffic meter is Judging whether the level is equal to or higher than level 1J; Signal meter If it is above the level, it continues to operate in traffic information broadcasting mode and the signal meter Driving to the tape in the traffic information waiting mode when the level is not higher than the level (1K); Determine whether the traffic information standby mode is off during tape driving, and if not, determine the level of the signal meter and repeat the above operation, and if the traffic information standby mode is off, continue to the tape mode (1L). It works.

As described in detail above, the present invention maintains the traffic information broadcasting by setting the off level of the traffic information broadcasting lower than the on level, thereby preventing frequent switching from the tape sound to the traffic information broadcasting sound during the reception of the traffic information broadcasting. The inconvenience of the listener is eliminated, and the operation is processed by the software of the controller, thereby preventing the cost increase due to the addition of the hardware.

Claims (1)

A tuning unit 1 for changing the frequency received through the antenna ANT1 and outputting the resonance state; An amplifying and detecting unit 2 which amplifies the output of the tuning unit 1 and rectifies and outputs extracted signal meter information; A traffic broadcasting detector (3) for detecting traffic information broadcasting among the signals detected by the amplification and detector (2); A controller (4) tuned to the oscillation frequency of the tuning unit (1) for controlling and outputting the signal meter output of the amplifying and detecting unit (2) or the output signal of the traffic broadcasting detecting unit (3); A key matrix 5 for inputting a key to select a control operation of the controller 4; A display unit 6 for displaying a control operation of the controller 4; In the car audio traffic information broadcasting control device comprising a multiplexer (7) for multiplexing the output of the amplification and detection unit (2) and outputting an audio signal through left and right speakers, the radio or tape when power is applied. Selecting 1A and; When the radio is selected, enters the last radio mode and determines whether there is a traffic information key input (1B); If there is no traffic key input, it operates in last radio mode, and if there is traffic key input, it starts automatic tuning and the signal meter Determining whether it is above the level (1C); If it is not above level, auto tuning starts and the signal meter If the level is higher than the traffic signal Determining whether the level is equal to or higher than level 1D; Traffic broadcast signal If the level is not over, auto tuning is performed. Receiving traffic information broadcast after stopping automatic tuning (1E) if the level is higher than the level; (1F) determining whether there is a traffic information key input after driving the tape when the tape is selected in the step 1A; If there is no traffic keystroke, drive the tape. If there is traffic keystroke, it starts auto-tuning and the signal meter Determining whether the level is equal to or higher than level 1G; Signal meter If it is not above level, drive the tape and the signal meter If the level is higher than the traffic signal Judging whether the level is equal to or higher than level (1H); Traffic broadcast signal If the level is not above, drive the tape and the traffic signal If the level is over, the auto tuning stops and the traffic information standby mode is entered. Determining whether the level is equal to or higher than level 1L; Traffic broadcast output signal If the level is not higher than the traffic information standby mode, the traffic signal output signal is If the level is higher, the tape is turned off and the traffic meter is Judging whether the level is equal to or higher than level 1J; Signal meter If it is above the level, it continues to operate in traffic information mode and the signal meter Driving to the tape in the traffic information waiting mode when the level is not higher than the level (1K); It is determined whether the traffic information standby mode is turned off during tape driving, and if it is not turned off, the signal meter level is determined and the above operation is repeated. If the traffic information standby mode is turned off, the operation continues in the tape mode (1L). A control method of a traffic information broadcasting control device using a signal meter voltage change of the F M middle frequency unit characterized in that the operation.