KR19980058126A - Broadcasting channel auto tuning method of car audio - Google Patents

Abstract

The present invention relates to a method of automatically tuning a broadcast channel of a car audio. In particular, when a reception channel is in a state where it is impossible to listen because the reception field strength is less than a predetermined value, the broadcast channel is automatically searched for and broadcasted to another broadcast frequency of the same broadcast station. Detects whether the broadcast channel auto-tuning function for tuning a channel is selected, and if it is determined that the broadcast channel auto-tuning function is selected, the received electric field strength of the receiving channel is continuously detected, and the value is less than a predetermined reference value. A reception sensitivity judging step 100 of determining whether the image is recognized; As a result of performing the reception sensitivity judging step 100, when the received electric field strength of the received broadcast channel is determined to be equal to or less than the predetermined reference value, the broadcast frequency for each region of the broadcast channel being received is read and the respective broadcasts are read. A broadcast frequency selection step (200) of detecting a received electric field strength with respect to a frequency and selecting a broadcast frequency having the largest received electric field strength by comparing the received electric field strength with respect to each of the detected broadcast frequencies; After performing the broadcast frequency selection step 200, the broadcast channel tuning step of automatically converting the reception frequency to the broadcast frequency selected in the broadcast frequency selection step 200, characterized in that it comprises a car audio Broadcast channel auto-tuning method.

The present invention stores the local broadcast frequency of each broadcast station, and when the received field strength of the receiving broadcast station is lower than a predetermined value, the broadcast frequency for each of the stored local broadcast stations is read and received among the read broadcast frequencies. By automatically tuning the reception frequency to the broadcasting frequency with the largest electric field strength, it is possible to continuously listen to the broadcast of the same broadcasting station regardless of the area where the vehicle enters.

Description

Broadcasting channel auto tuning method of car audio

1 is a block diagram showing the configuration of the car audio,

2 is a view showing the actual vehicle state of each component of the car audio,

3 is a control flowchart showing a broadcasting channel auto-tuning method of the present invention car audio.

Explanation of symbols for main parts of the drawings

100: reception sensitivity judging step 200: broadcasting frequency selection step

The present invention relates to a broadcasting channel automatic tuning method of the car audio, in particular, when the local characteristics of the broadcasting channel is changed due to the long-distance movement of the car, because it automatically switches the reception frequency to the changed broadcasting channel, Regardless of the region, the same broadcast content can be continuously listened to.

As is well known, the car audio includes an antenna unit 1 for receiving broadcast waves transmitted from a broadcasting station, as shown in FIG. A media source section 2 consisting of a radio tuner and a cassette and a CD (COM-PACT DISC); A sound wave compensator, which consists of a filter and a gain control circuit that passes only a specific frequency band, makes a good audible range correction by making the specific frequency band strong or weak to match the sound characteristics of the vehicle and the taste of the listener. Wow; An audible frequency amplifier (4) for amplifying an analog signal of an audible frequency output from the sound wave compensator (3); A speaker unit 5 including a plurality of speakers, an operation switch unit (not shown) operated by a user, a car audio microphone (not shown) for controlling the first operation of the car audio, and an operating state of the car audio A display panel (not shown); The display panel includes a digital clock (not shown) indicating time.

The car audio determines whether the operation mode selected by the user is a radio mode, a cassette mode, or a CD mode, and controls and operates a function of a corresponding component.

For example, when the user selects the radio mode through the operation switch to listen to the radio, the audio microcomputer includes the media source unit 2, the sound wave correction unit 3, the audio frequency amplifier unit 4 and the speaker unit. Through (5), the broadcast wave received by the antenna unit 1 is output.

2 is a view showing the installation state of each car audio component configured as described above.

On the other hand, the device that enables to listen to the same broadcast irrespective of each local broadcast is the automatic tuning function of the RDS (RADIO DATA SYSTEM) function, which is, when broadcasting broadcasts from the broadcasting station, each country, region, and broadcasting station After assigning a specific code to identify the RDS signal, the RDS signal is detected by the RDS-equipped car audio to detect the frequency of the broadcasting channel for each region, and the reception frequency is automatically tuned to the detected frequency.

For example, after assigning codes for a main broadcasting station and a local broadcasting station of a specific broadcasting station, when a car leaves the main broadcasting station and enters the local broadcasting station, the code for the broadcasting channel frequency of the local broadcasting station is detected. It is possible to continuously listen to the same broadcasting station by automatically tuning the frequency of the broadcasting channel by the code to the reception frequency.

However, in order to use the RDS function as described above, RDS broadcasting should be performed by a broadcasting station, and each user should be equipped with an expensive device capable of receiving the RDS signal, and the characteristics and noise of surrounding features. When the RDS signal is disturbed by this, there is a problem that a malfunction occurs.

SUMMARY OF THE INVENTION An object of the present invention is to solve the conventional problems as described above. In particular, after storing the local broadcasting frequency of each broadcasting station, the receiving field strength of the receiving broadcasting station is continuously detected, and the receiving field strength is a constant value. In the following case, the broadcasting frequency for each of the stored local broadcasting stations is read out to automatically tune the receiving frequency to the broadcasting frequency having the largest received electric field strength among the read broadcasting frequencies, so that broadcasting of the same broadcasting station is continued regardless of the region. The present invention provides a method of auto tuning a broadcasting channel of a car audio so that it can be listened to.

In order to achieve the above object, in the broadcasting channel auto tuning method of the present invention, when the reception field strength of the reception channel is not a predetermined value and the listening is impossible, the broadcasting channel is automatically searched for another broadcasting frequency of the same broadcasting station. Detects whether or not the broadcast channel auto-tuning function is selected, and if it is determined that the broadcast channel auto-tuning function is selected, the received electric field strength of the receiving channel is continuously detected, and whether the value is equal to or less than a predetermined reference value. A reception sensitivity judging step of determining whether the; As a result of performing the reception sensitivity judging step, when the received electric field strength of the received broadcast channel is determined to be equal to or less than the predetermined reference value, the broadcast frequency for each region of the broadcast channel being received is read, and for each of the read broadcast frequencies, A broadcast frequency selection step of detecting a received electric field strength and selecting a broadcast frequency having the largest received electric field strength by comparing the received electric field strength with respect to each of the detected broadcast frequencies; After performing the broadcast frequency selection step, characterized in that the method comprises a broadcast channel tuning step of automatically converting the reception frequency to the broadcast frequency selected in the broadcast frequency selection step.

According to the broadcasting channel auto-tuning method of the present invention, after storing the local broadcasting frequency of each broadcasting station, when the receiving field strength of the receiving broadcasting station is less than a predetermined value, the broadcasting frequency for the stored local broadcasting station is read out. By automatically tuning the reception frequency to the broadcast frequency with the highest received electric field strength among the read broadcast frequencies, it is possible to continuously listen to broadcasts of the same broadcast station regardless of region.

Hereinafter, with reference to the accompanying drawings for an embodiment according to the technical idea of the broadcast channel automatic tuning method of the present invention configured audio car as described above in detail as follows.

Example

First, the received electric field strength, which becomes unreceivable due to the long-distance driving of the car, is calculated through a number of repetitive experiments and the reference value is set, and then the internal memory of the car audio micom, or Stored in an external memory under the control of the car audio microcom.

In addition, the broadcasting frequency of each broadcasting station is stored in the internal memory of the car audio microphone or in an external memory controlled by the car audio microphone.

For example, for KBS FM broadcasting stations, the main broadcasting frequency and regional broadcasting frequencies are 89.1 MHz, 79.3 MHz, 90.3 MHz, and 99.5 MHz. For MBC FM broadcasting stations, the main broadcasting frequency and regional broadcasting frequencies are 91.9 MHz, 94.9 MHz, and 98.9. In MHz, such a frequency for each broadcasting station is stored in the memory.

In addition, by setting a key for setting and releasing the broadcast channel auto-tuning function in the operation switch unit for operating the function of the car audio, if the set key is selected to perform the broadcast channel auto-tuning function, and release If the key is selected, the broadcast channel auto tuning function is released.

The car audio micom then detects whether or not the broadcast channel auto-tuning function is selected by the user, as shown in FIG. If it is determined that the broadcast channel auto-tuning function is selected, the reception sensitivity determination step 100 of continuously detecting the received electric field strength of the reception channel and determining whether the value is equal to or less than a predetermined reference value is performed.

That is, it is determined whether the vehicle is out of the current broadcasting frequency range by comparing the value of the received electric field strength with the reference value stored in the memory.

In addition, when the reception field strength of the received broadcast channel is determined to be equal to or less than the predetermined reference value as a result of performing the reception sensitivity determining step 100, the broadcast frequency for each region of the broadcast channel being received is read and read. The receiving field strength of each broadcast frequency is detected, and the received field strength of each detected broadcast frequency is compared to perform a broadcast frequency selection step 200 of selecting the broadcast frequency having the largest receiving field strength.

For example, when receiving a KBS FM broadcasting station at a reception frequency of a broadcasting frequency of 89.1 MHz, and the received electric field strength of the receiving frequency is lower than a reference value, the local broadcasting frequencies of the KBS FM broadcasting station are 79.3 MHz, 90.3 MHz, and 99.5. By detecting the received electric field strength with respect to the broadcast frequency of MHz, the broadcast frequency representing the largest received electric field strength is selected. That is, it is determined that the user enters the region using the broadcast frequency representing the largest received electric field strength and selects the broadcast frequency.

In addition, after the broadcast frequency selection step 200 is selected, a broadcast channel tuning step 300 for automatically converting a reception frequency to the broadcast frequency selected in the broadcast frequency selection step 200 is performed. It automatically converts broadcasting frequencies of broadcasting stations according to the characteristics of each region so that the same broadcasting can be continuously listened to.

As described above, in the broadcasting channel auto-tuning method of the present invention, in particular, after storing the local broadcasting frequency of each broadcasting station, when the received field strength of the receiving broadcasting station becomes less than a predetermined value, each of the stored local broadcasting stations By automatically reading the broadcasting frequency for and automatically tuning the reception frequency to the broadcasting frequency with the largest received field strength among the read broadcasting frequencies, it is possible to continuously listen to the broadcasting of the same broadcasting station regardless of the area where the vehicle enters. It works.

Claims (1)

When the reception electric field strength of the reception channel is less than a predetermined value and the state is impossible to listen to, the broadcast channel automatic tuning function for automatically searching for another broadcast frequency of the same broadcast station and tuning the broadcast channel is detected, and the broadcast channel is detected. A reception sensitivity judging step of continuously detecting a received electric field strength of a reception channel and determining whether the value is equal to or less than a predetermined reference value when it is determined that the auto-tuning function is selected; As a result of performing the reception sensitivity judging step, when the received electric field strength of the received broadcast channel is determined to be equal to or less than the predetermined reference value, the broadcast frequency for each region of the broadcast channel being received is read, and for each of the read broadcast frequencies, A broadcast frequency selection step of detecting a received electric field strength and selecting a broadcast frequency having the largest received electric field strength by comparing the received electric field strength with respect to each of the detected broadcast frequencies; And a broadcast channel tuning step of automatically converting a reception frequency to a broadcast frequency selected in the broadcast frequency selection step after performing the broadcast frequency selection step.