KR19980058009A - Automatic Tuning Method of Electronic System with Tuning Circuit - Google Patents

Abstract

The present invention relates to an automatic tuning method of an electronic system equipped with a tuning circuit. In the case of automatic fine tuning of a tuning signal of a tuning circuit unit, it is determined whether the frequency change point within the automatic fine tuning frequency range is odd or even and the optimum broadcasting is performed according to the determined result. By setting the signal reception point, the optimum broadcast signal reception point is scanned within any auto-tuned frequency range. Therefore, the tuning characteristics can be optimized accordingly, and the tuning system is optimally adapted to the tuning conditions. Will also increase.

Description

Automatic Tuning Method of Electronic System with Tuning Circuit

The present invention relates to an automatic tuning method of an electronic system equipped with a tuning circuit. In particular, when automatic tuning of a tuning signal of the tuning circuit part, it is determined whether the frequency change point within the automatic untuned frequency range is odd or even and the result is determined. The present invention relates to an automatic tuning method for an electronic system equipped with a tuning circuit for setting an optimal broadcast signal reception point according to the present invention.

In general, a system having a broadcast receiving function using over-the-air communication, for example, the broadcast receiving function of the VTR system receives broadcast channel signals transmitted to a plurality of broadcast stations and displays the received broadcast channel signals as image data. The VT system with this function is equipped with an automatic fine tuning circuit (AFT = AUTOMATIC FINE TUNING) to perform accurate broadcast channel tuning.

Then, referring to Figure 1 VTV system having such a function, when switching the multi-channel TV broadcast signal input through the antenna 70, or if the VAL output signal of a certain channel signal (3, 4 channels Modulator 71 for modulating the modulator 71, a tuner unit 72 for receiving and tuning TV broadcasting signals switched from the modulator 71, and an information signal of high frequency tuned by the tuner unit 72. An intermediate frequency processor 73 for converting into a frequency signal, an image signal processor 74 for video signal processing of a video signal among signals demodulated by the intermediate frequency processor 73, and a demodulation by the intermediate frequency processor 73 The voice signal processing unit 75 performs a voice signal processing of the voice signal.

One end of the video signal processor 74 is connected to a display 76 that displays an image signal as an image, and a speaker 77 that emits an audio signal is connected to the audio signal processor 75.

On the other hand, looking at the tuning operation of the conventional VT system configured as described above, for example, when the user sets the channel that he wants to watch, the modulator 71 of the multiple channels input through the antenna 70 The TV broadcast signals are received and input to the tuner unit 72. Then, the tuner unit 72 tunes a channel signal set by the user among the inputted broadcast channel signals, and at this time, an internal microcomputer (not shown). The video signal processor 74 detects a synchronization signal and scans a channel frequency range. When the channel frequency range is scanned by the synchronization signal, the automatic fine tuning mode (AFT) is executed to scan the current optimal broadcast signal reception point. At this time, the set channel frequency range is expressed in the form of an automatic fine tuning curve (AFT-CURVE) as shown in FIG. 2, for example, by changing in units of digits within the set fine tuning section (W _H point to W _L point). The optimum broadcast signal reception point is scanned by shifting from W _H point to W _L point in digit step units (e.g., f + 62.5 KHZ). In this process, if there is a step between this W _H point and W _L point, that is, if there is no optimal broadcast reception adjustment point, the W _C point, which is the intermediate point between this W _H point and W _L point, is set as the optimal broadcast signal reception point. The automatic fine adjustment operation is terminated. Therefore, when this automatic fine adjustment is finished, the tuned channel signal is input to the intermediate frequency processing section 73. The intermediate frequency processor 73 demodulates the tuned high frequency information signal into an intermediate frequency signal and inputs it to the video and audio signal processors 74 and 75, respectively. In addition, the video and audio signal processing units 74 and 75 process the input information signal by video and audio signals, respectively, and then display the video signal as an image signal on the display 76. In addition, the voice signal synchronized with the above operation is also processed by the voice signal processor 75 and then output through the speaker 77. Thus, the viewer repeats this process so that the viewer can clearly see the broadcast channel signal tuned by the automatic fine adjustment operation.

However, the channel tuning function of the conventional system having the broadcast receiving function as described above is set to a steep inclination between the W _H point and the W _L point due to the internal disturbance signal of the system. Since the tuning operation cannot be performed without the step, that is, the optimum broadcast reception fine adjustment point between adjustment sections, the operation reliability of the system is considerably deteriorated accordingly. Also, the first tuning operation fails due to the above-mentioned causes. If you run the screen may change, the system functionality is also reduced accordingly.

Therefore, the present invention was invented to solve the above-mentioned problems. When automatically tuning the tuning signal of the tuning circuit unit, it is determined whether or not the frequency change point within the automatic fine tuning frequency range is odd or even and based on the determined result. By setting the optimal broadcast signal reception point, the optimal broadcast signal reception point is scanned within any auto-tuned frequency range, so it provides an automatic tuning method of an electronic system equipped with a tuning circuit to optimize the tuning characteristics accordingly. There is a purpose.

Another object of the present invention is to provide an automatic tuning method for an electronic system equipped with a tuning circuit, in which the tuning system is optimally adapted to the tuning conditions, thereby increasing the functionality of the system.

The present invention for achieving the above object is a synchronization signal presence determination step of determining whether there is a synchronization signal in the band of the currently set channel when the channel setting signal is input to the electronic system equipped with a tuning circuit unit, and the synchronization signal presence determination As a result of the determination in the step, if there is no synchronization signal in the set band, the reference broadcasting frequency setting step of setting the reference broadcast center frequency of the preset band, and the determination result of the synchronization signal presence determination step, In this case, the unadjusted point scan step of scanning the unadjusted point while shifting the set unadjusted period by the digit step unit, and the result of the judgment during the unadjusted point scan step, if there is a data change point within the unadjusted period range, The data change point determination step of determining whether the vertices are odd, and this data In the case of the odd number of unadjusted points, the center value setting step of setting the unadjusted point existing in the center as the optimal broadcast signal and the result of the judgment made during the data change point number determination step If the number of vertices is not an even number, the low center value setting step of setting an unadjusted point having a low voltage as the optimum broadcast signal at two unadjusted points closest to the center point among the even number of unadjusted points, and the fine point If the unadjusted point does not exist within the unadjusted section as a result of the determination during the scanning step, the center closest value setting step of setting the unadjusted point closest to the center value among the unadjusted points outside the unadjusted range is characterized.

1 is an explanatory diagram illustrating a system provided with a conventional tuning circuit;

2 is a waveform explanatory diagram for explaining an automatic fine adjustment (AFT) function,

3 is an explanatory diagram illustrating a system to which the method of the present invention is applied,

4 is a flowchart of the present invention,

5A and 5B are waveform explanatory diagrams for explaining an automatic fine adjustment function executed by the method of the present invention.

Explanation of symbols for the main parts of the drawings

1 antenna 2 modulator

3: tuner portion 4: intermediate frequency processing portion

5: video signal processor 6: audio signal processor

7: micom 8: display

9: speaker 10: key input

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

In the system to which the present invention is applied, as shown in FIG. (2), a tuner section 3 for tuning the broadcast signals switched from the modulator 2, and an intermediate frequency processing section for converting information signals of the high frequency tuned by the tuner section 3 into intermediate frequency signals. (4) and a video signal processing unit (5) for processing the video signal among the signals demodulated by the intermediate frequency processing unit (4), and the audio signal processing of the audio signal among the signals demodulated by the intermediate frequency processing unit (4). And a microcomputer 7 for executing the automatic fine tuning function according to the automatic fine tuning (AFT) voltage of the intermediate frequency processing section 4 and controlling the overall operation of the system.

A display 8 for displaying an image signal as an image is connected to one end of the image signal processor 5, and a speaker 9 for emitting an audio signal is connected to the audio signal processor 6. In addition, the microcomputer 7 is connected to the key input unit 10 for inputting a function setting signal of the user.

The following describes the method of the present invention applied to such a system.

In the present invention, as shown in Figure 4, when the user sets the channel that he wants to watch through the key input unit 10, the microcomputer 7 in the initial step (S1) channel setting signal input step (S2) The channel tuning function is executed according to the set channel setting signal. Then, after the channel setting signal input step S2, the process proceeds to the step of determining whether or not a synchronization signal exists and whether there is a synchronization signal in the band of the currently set channel. That is, it is determined whether a broadcast signal actually exists. At this time, if it is determined during the synchronization signal presence determination step (S3), if there is no synchronization signal in the set band, the process proceeds to the reference broadcast frequency setting step (S4) to set the reference broadcast center frequency of the preset band.

However, as a result of the determination during the synchronization signal presence determination step (S3), if there is a synchronization signal in the band, the process proceeds to the increment fine adjustment step (S5) and shifts to the set fine adjustment section (for example, W _H to W _L ) while stepping. In other words, the optimal broadcast reception fine adjustment point is scanned. After the increase fine adjustment step S5, the process proceeds to the fine adjustment change point determination step S6 to determine whether there is a data change point, that is, an optimal broadcast reception fine adjustment point within the currently tuned fine adjustment section, and if the increase is made, If no data change point exists within the fine adjustment section, the process proceeds to the decrease fine adjustment step (S7). In addition, in the decrease fine adjustment step S7, the scan is shifted to the fine adjustment section (for example, from W _L to W _H ) as opposed to the increase fine adjustment step S5. After the reduced fine adjustment step S7, the process proceeds to the fine adjustment change point determination step S8 to determine whether there is a data change point, that is, an optimal broadcast reception fine adjustment point within the adjustment period.

That is, when the channel is set, the modulator 2 receives the broadcast signals of the various channels input through the antenna 1 and inputs them to the tuner unit 3. The tuner unit 3 then inputs the input broadcast channel. The channel signal set by the user is tuned among the signals. At this time, the microcomputer 7 detects the synchronization signal from the video signal processor 5 and scans the channel frequency range. When the channel frequency range is scanned by the synchronization signal as described above, the automatic fine tuning mode (AFT) is executed to scan the optimal broadcast signal receiving point. In this case, the microcomputer 7 receives the automatic fine tuning voltage from the intermediate frequency processor 4. AFT voltage) is input and the automatic fine adjustment function is executed using this automatic fine adjustment voltage. Therefore, the unadjusted voltage input from the intermediate frequency processing section 4 is expressed in the form of an automatic fine adjustment curve (AFT-CURVE) as shown in Figs. 5 (a) and 5 (b). as the change in the W _L points) from the point _H to the digit unit for example, the digit step unit which is increased between the point W _H in or W _L points as W _L points in the W _H point (optimal as shifted to e. g., f + 62.5 KHZ) The broadcast fine tuning point is scanned.

On the other hand, if the data change point exists within the range of the adjustment period as a result of the determination in the fine adjustment change point determination step S6, the process proceeds to the data change point number determination step S9. And, there is that it has a data transfer point number judgment step that is, the optimum broadcasting fine vertex between the point W _H in W _L points or W _L points in the fine adjustment section for example, W _H that in the step (S9) determining whether the odd individual, At this time, if there are an odd number of optimal broadcast reception fine adjustment points, the process proceeds to the center value setting step (S10) to set an optimal broadcast reception fine adjustment point existing in the center among the odd number of optimal broadcast reception fine adjustment points as an optimal broadcast signal. For example, in Figure 5 (a) of the fine-tuning section (W _L points in the point W _H) as it is shown in a, b, c, d, when it is assumed that the five best broadcast receiving fine vertex presence of e W _The point c closest to the point C is set.

However, as a result of the determination in the number of data change point determination step (S9), if the optimum number of unreceived broadcast adjustment points is not an odd number, that is, an even number, the process proceeds to a low center value setting step (S11), whereby the even number of optimal broadcast reception unadjusted points is determined. Among them, the optimum broadcast reception unadjusted point having the low voltage among the two unadjusted points closest to the center point W _C is set as the optimal broadcast signal. For example, assume that there are an even number of a, b, c, d, e, f six optimal broadcast reception coordination points in the fine adjustment section (W _H point to W _L point) as shown in FIG. 5 (b). In this case, the d point having the lower voltage among the c and d points closest to the W _C point is set.

On the other hand, if the data change point, that is, the optimal broadcast reception fine adjustment point exists in the unadjusted period as a result of the determination during the fine adjustment change point determination step (S8), the process proceeds to the data change point number determination step (S9) and repeats the loop. . However, if the data change point, that is, the best broadcast unreconciled point does not exist within the unreconciled section, for example, the optimal broadcast receivable unreconciled point is found in the unreconciled section (W _H point). _{If out of the L} point) range, the process proceeds to the center nearest value setting step (S12). In the center nearest value setting step (S12), an unadjusted point closest to the center value W _C among the optimal broadcast reception unadjusted points outside the unadjusted range is set. For example, FIGS. 5 (a) and 5 (b). As shown in FIG. 2, when the optimal broadcast reception fine adjustment point x, z exists outside the fine adjustment section (W _H point to W _L point), the x point closest to the point W _C is set.

Therefore, when this automatic fine tuning function is terminated, this tuned channel signal is input to the intermediate frequency processing section 4. The intermediate frequency processing section 4 then demodulates the tuned high frequency information signal into an intermediate frequency signal and inputs it to the video and audio signal processing sections 5 and 6, respectively. In addition, the video and audio signal processing sections 5 and 6 process the input information signal and video and audio signals, respectively, and then display the video signal as an image signal on the display 8. In addition, the voice signal synchronized with the above operation is also processed by the voice signal processor 6 and then output through the speaker 9.

Therefore, according to the present invention, an accurate tuning operation can be performed under any fine curve (AFT curve) situation, so that a clear image is obtained.

As described above, in the present invention, when automatically tuning the tuning signal of the tuning circuit, the present invention determines whether the frequency change point within the automatic tuning frequency range is odd or even and sets the optimal broadcasting signal reception point according to the determined result. In addition, the optimum broadcast signal reception point is scanned within any auto-tuned frequency range. Therefore, the tuning characteristics can be optimized accordingly, and the tuning system adapts optimally to the tuning conditions, thereby increasing the functionality of the system. .

Claims (1)

When the channel setting signal is input to the electronic system provided with the tuning circuit unit, the synchronization signal determination step of determining whether there is a synchronization signal in the band of the currently set channel, and as a result of the determination during the synchronization signal presence determination step, If it does not exist, the reference broadcast frequency setting step of setting the reference broadcast center frequency of the preset band and if the synchronization signal is present in the band as a result of the determination during the step of determining whether there is a synchronization signal in the digit step unit Determination of the number of data change points to determine whether there are an odd number of unadjusted points in the unadjusted section if the data change points exist within the range of the unadjusted section as judged during the unadjusted point scan step that scans the unadjusted points while shifting. And the result judged during this data change point count determination step. If there are an odd number of points, the center value setting step of setting an unadjusted point existing in the center as an optimum broadcasting signal among the odd number of unadjusted points and an even number of unadjusted points if the number of unchanged points is not determined as a result of the determination of the number of data change points. The low center value setting step of setting the unadjusted point having the low voltage as the optimum broadcast signal at the two unadjusted points closest to the center point among the even number of unadjusted points, and the result of the judgment during the unadjusted point scan step A method for automatic tuning of an electronic system with a tuning circuit, comprising: setting a center nearest value setting step of setting an unadjusted point closest to a center value among the unadjusted points outside the unadjusted range when there is no unadjusted point.