KR101564468B1 - Automatic frequency selection method for a radio - Google Patents

Abstract

The present invention relates to a radio system, and more particularly, to a radio system for preventing a bad broadcast from being picked up by grasping a bad reception frequency when the radio is automatically tuned, To an automatic tuning method. The present invention relates to automatic tuning of a radio receiver, and more intelligent automatic tuning can be performed in a strong electric field. In addition to radio broadcasting, the present invention can be applied to a TV, a digital multimedia broadcasting (DMB) ) (European) broadcasts, which can be applied to all of the radio frequencies.

Strong field, distortion, bad frequency list, single tuner.

Description

[0001] The present invention relates to an automatic frequency selection method for a radio,

The present invention relates to a radio system, and more particularly, to a system and method for preventing a broadcast signal from being poorly received, The present invention relates to a method for automatically tuning a frequency of a radio provided.

2. Description of the Related Art In general, a car audio video system in recent years includes a key input unit, a display unit, an audio processing unit, an AM (Amplitude Modulation) / FM (Frequency Modulation) radio receiver, a TAPE processing unit, a CD (Compact Disk) processing unit, a video processing unit, And a control unit, a memory, and the like.

The control unit controls the overall operation of the vehicle audio video system, and the memory stores programs and data to be used in the audio video system and provides them by control of the control unit.

The conventional radio automatic station selection function will be described below.

Normally, in an automobile audio video system, an automatic tuning function is provided in which, when listening to an AM or FM radio, a button is simply pressed to select and receive a broadcast.

The conventional auto tuning function of the radio generally evaluates the RF input level, the frequency accuracy, and the degree of noise, and when the preset reference condition is satisfied, the channel is tuned to receive the broadcast. However, when automatic tuning is applied by applying only these conditions, when the transmitting tower is located in a dense strongband area, the bad broadcast is automatically selected by another broadcast of the strong system even though the actual broadcasting is not provided. .

The present invention solves the above-mentioned problems, and it is an object of the present invention to provide an automatic tuning of a radio receiver, which can perform intelligent automatic tuning in a strong electric field system, The present invention aims at providing a method for automatic frequency tuning of a radio, which can be applied to reception of broadcasting in Europe.

Further, according to the present invention, a radio receiver generates a strong-current system frequency list indicating an electric field strength of a specific electric field or higher at the time of automatic tuning, sets a harmful frequency list in a strong electric system frequency list, It is intended to provide a method for automatic frequency tuning of a radio which provides an enhanced automatic tuning function since the list is excluded when tuning is performed.

According to another aspect of the present invention, there is provided a method of automatically tuning a channel for receiving a broadcast signal, the method comprising: a first step of detecting a strong-current system frequency by scanning all channels of the broadcast in a receiver; And a third step of receiving the broadcast by selecting the automatically tuned frequency if the frequency tuned to by the receiver does not correspond to the bad frequency list, The frequency list is generated by calculating the harmonic using the strong-field system frequency, and generating a frequency other than the magnetic frequency and the effective frequency range as a result of the calculation as the defective frequency list.

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And a second step of generating a defective frequency list in advance. In case of two receivers, if one receiver is used to grasp a strong system frequency, A third step of processing a first step and a second step of generating a defective frequency list in the background and simultaneously receiving broadcasting through a frequency automatically tuned to another receiver.

The present invention has the effect of automatically selecting a channel having a better reception quality than that of the automatic tuning of the radio receiver and performing an intelligent automatic tuning in the strong electric field system.

Further, the present invention can be applied not only to a radio but also to other broadcast signals such as AV system, TV, DMB, HD Radio (North America), and DAB (Europe).

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

In the following description, only parts necessary for understanding the operation according to the present invention will be described, and description of other parts will be omitted.

The present invention relates to an intelligent radio frequency automatic tuning system, which prevents a faulty frequency due to interferences between strong signals from being tapped, in particular a channel with excellent automatic tuning function in a strong system, And it shows excellent performance in reception of other broadcasts such as TV, DMB, and DAB.

FIG. 1 is an operation flow chart for processing an automatic tuning in the case of having a single tuner according to an embodiment of the present invention.

First, in case of one receiver in step 500, the controller of the radio receiver scans all the channels in advance. All channels are conducted for AM and FM broadcasting.

The flow advances to step 510 to compare the result of scanning all the channels with the strong field reference value to grasp the frequency representing the strong field.

The present invention is intended to block a case where a bad broadcast is automatically selected by another broadcast having a strong electric field but no real broadcast and having a strong electric field.

The strong reference value is higher when the dynamic range of the radio receiver is larger.

In steps 520 to 540, harmonics are calculated using the frequency representing the strong electric field in the control unit. In the case of AM broadcast, the second and third harmonics are calculated, and the frequencies outside the effective frequency range The remaining frequency is selected as a defective frequency list and the previous defective frequency list is initialized to generate a newly calculated defective frequency list.

In the case of FM broadcasting, the third harmonic is calculated, and as a result of the calculation, the frequency other than the magnetic frequency and the effective frequency range is selected as the defective frequency list, and the previously stored defective list is initialized and the newly calculated defective frequency list And stores it in the memory. When applied to other broadcasts such as TV, DMB, etc., only the second and third harmonics present in the band are calculated.

Also, the third harmonic calculation of the FM broadcast uses 2 * f1-f2 for only the frequency within the effective frequency, and for the AM broadcast, the harmonic calculates f1-f2 and 2 * f1- Only the frequency is used in the bad list. Where f1 is the magnetic frequency and f2 is the adjacent frequency.

If the radio has a single tuner, the defective frequency list is generated in advance and the defective frequency list is updated by performing the generating operation at every set period interval.

On the other hand, if the user selects automatic tuning using the radio receiver in steps 550 to 560, the controller evaluates the strength of the signal, the accuracy of the frequency, the degree of noise, and the like in a preset manner to determine whether the frequency is suitable for tuning .

If it is determined in step 570 to step 580 that the corresponding frequency is suitable for channel selection, the control unit determines whether the frequency is included in the defective frequency list generated in steps 500 to 540. If the frequency is included in the defective frequency list, So as to grasp the channel quality of the new adjacent frequency again.

In steps 590 to 600, if the frequency is not included in the defective frequency list, the control unit determines that the broadcast is received at a suitable frequency, and tunes in.

When a strong signal of a nonlinear region is input upon reception of a real broadcast signal, distortion occurs, and a third harmonic acts as a main obstacle in such a distortion component, thereby causing a problem in automatic tuning.

In the present invention, when one receiver (single tuner) is provided, all the frequency bands are searched before the automatic tuning, the harmonics are calculated, a defective frequency list is generated, To improve the quality of automatic tuning.

2 is a diagram showing an example of a list of strong energies in accordance with an embodiment of the present invention.

FIG. 2 is a diagram showing a strong electric field list generated by grasping the intensity of an electric field of an FM broadcast. A frequency having a reference value of 100 dBuV and an electric field strength higher than that of the strong electric field is designated as a strong electric field frequency. The strong reference value is determined according to the dynamic range of the radio receiver, and the higher the dynamic range of the radio receiver, the higher the reference value.

Referring to FIG. 2, an example of a graph showing the FM frequency and the field strength (dBuV) shows a field strength (dBuV) of 104.98 that exceeds the strong field reference value 100 at a frequency of 90.0, and 97.4 MHz, 101.8 MHz, 103.9 MHz, and 106.1 MHz (DBuV) of 105.75, 102.55, 107.44, 112.03, and 103.41 dBuV exceeding the strong field reference value of 100 (dBuV) even at 106.6 MHz.

FIG. 3 is a diagram illustrating an example of calculating a harmonic using a strong-current system frequency list calculated in FIG. 2 and generating a defective frequency list.

In the figure, the third harmonic of the FM broadcast is calculated by applying 2 * f1-f2. From the calculation result, the remaining frequencies excluding the magnetic frequencies except for the frequencies having the values other than the effective frequency range of 87.5 MHz ~ As shown in FIG.

f1 is the magnetic frequency, f2 is the adjacent frequency, and the third harmonic is calculated by applying 2 * f1-f2. In the result of FIG. 3, 104.8, 93.0, 90.9, 88.7, 88.2, 106.2, 101.7, 101.2, 105.6, and 107.1 correspond to those of the defective frequency list except for the frequencies other than the above- .

4 is a flowchart illustrating an automatic tuning process in the case of having two receivers (dual tuners) according to an embodiment of the present invention.

In case of two tuners different from FIG. 1, one receiver is used for broadcast reception, and another receiver is used to create a defective frequency list in the background and applied to real-time automatic channel selection.

The overall operation is the same for a single tuner or a dual tuner.

In step 700, if the user selects auto tuning of the radio, tuner 2 (not shown) scans all channels in the background. In the case of FM broadcasting, the effective frequency range is 87.5 MHz to 108 MHz.

In step 710, the frequency indicating the strong electric field is determined according to the strong electric field reference value determined in the dynamic range of the radio receiver. The strong reference value is higher when the dynamic range of the radio receiver is larger.

In steps 720 to 740, the harmonics are calculated in the control unit. In the case of AM broadcasting, the second and third harmonics are calculated, and the remaining frequencies excluding the magnetic frequency and the frequencies other than the effective frequency range are selected as the bad frequency list And the previous bad list is initialized.

In the case of FM broadcast, the third harmonic is calculated as shown in FIG. 3, and the remaining frequency except for the frequencies other than the magnetic frequency and the effective frequency range is selected as the bad frequency list, the previously stored bad list is initialized, A list is created and stored in memory. When applied to other broadcasts such as TV, DMB, etc., only the second and third harmonics present in the band are calculated.

In the above-described steps 700 to 740, when two receivers (dual tuners), the receiver 2 (not shown) generates a defective frequency list in the background, and this generation operation is performed every set period interval to update the defective frequency list.

In step 800, the receiver operates in the receiver 1 (not shown). When the user selects automatic tuning using the radio receiver, the controller evaluates the signal strength, frequency accuracy and noise level in a preset manner, It is determined whether or not the frequency is suitable for channel selection.

If it is determined in step 810 to 840 that the corresponding frequency is suitable for channel selection, the controller determines whether the frequency is included in the defective frequency list generated in steps 700 to 740. If the frequency is included in the defective frequency, Again, let us know the channel quality of the new adjacent frequency.

If the corresponding frequency is not included in the defective frequency list, the controller proceeds to step 850, and determines that the corresponding frequency is a frequency suitable for broadcast reception and selects the selected frequency.

As described above, according to the present invention, a defective frequency list for searching all the broadcast bands, generating a strong electric system frequency list, and generating a disturbance wave between strong signals is generated and excluded at the time of automatic tuning, .

The configuration and operation of the embodiment of the present invention have been described so far. The present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the claims and equivalents thereof.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is an operational flow diagram for handling automatic tuning of a radio having a single tuner according to one embodiment of the present invention.

2 is a diagram showing an example of a strong electric field system frequency according to an embodiment of the present invention;

FIG. 3 is a view showing an example of calculating a harmonic using a strong-current system frequency list calculated in FIG. 2 and generating a defective frequency list; FIG.

FIG. 4 is an operational flow chart for processing automatic tuning of a radio having two receivers (dual tuners) according to an embodiment of the present invention; FIG.

Claims (7)

An automatic station selecting method for automatically selecting a channel upon receiving a broadcast, A first step of scanning the entire channel of the broadcast in the receiver to grasp the strong electric field frequency; A second step of calculating a harmonic from the strong system frequency to generate a defective frequency list; And And a third step of selecting the automatically tuned frequency and receiving the broadcast if the frequency tuned to by the receiver does not correspond to the defective frequency list, Wherein the defective frequency list is generated by calculating a harmonic using the strong system frequency, and generating the deficient frequency list as a result of calculation, excluding the magnetic frequencies and the frequencies other than the effective frequency range. The method according to claim 1, Wherein the first step is based on a strong electric field frequency when the electric field strength of the frequency is equal to or greater than a strong electric field reference value determined by a dynamic range. delete The method according to claim 1, A first step of recognizing the strong electric field frequency when the receiver is one, and a second step of generating the defective frequency list in advance. The method according to claim 1, A first step of recognizing the strong electric field frequency with one receiver when there are two receivers, a second step of generating the defective frequency list in the background, and at the same time, And a third step of receiving a broadcast signal. The method according to claim 1, Wherein the broadcast includes radio, TV, DMB, DAB, and HD Radio broadcasting. The method according to claim 1, Wherein the defective frequency list is generated and provided for each set period interval.

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