KR0162368B1 - Automatic channel selecting method and apparatus for a television - Google Patents

Abstract

The TV automatic tuning device of the present invention detects the synchronous signal and the floating signal from the video detection signal, respectively, and outputs a synchronous detection signal and a L / L 'broadcast recognition signal, respectively. An automatic recognition processing unit for receiving a B / G broadcasting method recognition signal and an L / L 'broadcasting method recognition signal from the presence detection unit, the synchronization detection and signal presence detection unit, and controlling the automatic tuning to the recognized broadcasting mode. By detecting and using the synchronous and floating devices as described above, it is possible to prevent the screen from being distorted during the phase reversal and the switching of the FM and AM, or to prevent the operation of the FM / AM, and to broadcast the TV according to the automatically received broadcast signal. It is convenient to use because the user does not need to select separately by selecting the method and detecting the presence of a signal. Reducing road by a high-quality, effective for realizing a high function of the TV.

Description

TV automatic tuning device and automatic tuning method

1 is a block diagram of a TV automatic tuning apparatus according to the prior art.

2 is a block diagram of a TV automatic tuning apparatus according to the present invention.

3 is a detailed circuit diagram of the synchronous detection and signal presence detection unit of FIG.

4 is a graph showing image detection characteristics of each broadcasting system during tuning.

5 is a flowchart showing an automatic tuning method of a TV automatic tuning apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

1: Tuner 2: Image detector

3: Phase inversion switching unit 4,4 ': Float detector

5: FM detector 6: AM detector

7: FM / AM switching unit 8: Signal detection unit

10: microcomputer 20: amplifier

21: Synchronizer detection unit 22: Synchronous detection and signal presence detection unit

23: automatic recognition processing unit 24: broadcast recognition L / L 'automatic recognition unit

25: FM / AM automatic recognition unit

The present invention relates to a TV (TV), in particular, to prevent malfunction when receiving the broadcast recognition L / L 'signal, automatic tuning time, TV (TV) automatic tuning device that each broadcasting method is automatically selected according to the region And an automatic tuning method.

In the conventional TV automatic tuning apparatus, as shown in FIG. 1, a tuner 1 for tuning a received broadcast signal, an image signal from the output of the tuner 1, and an FM signal are respectively shown. Phase reversal switching for phase reversing the output of the image detector 2, the FM detector 5, the AM detector 6, and the image detector 2 for detecting a signal and an AM signal. A floater detector 4 for detecting a synchronization signal from the output of the image detector 2 and transmitting it to the phase inversion switching unit 3 and the FM / AM switching unit 7; ID signal indicating the presence or absence of a signal from the FM / AM switching unit 7 for selecting the outputs of the FM detector 5 and the AM detector 5 and the phase inversion switching unit 3 ( A signal detector 9 for detecting and transmitting an ID) to the microcomputer 8, and the image detector 2 It consists of a microcomputer (8) for controlling automatic tuning by inputting the auto-tuning signal (AFT) of the signal and the ID signal (ID) of the signal detection unit (9). As follows

The intermediate frequency of the broadcast signal received by the tuner 1 is input to the image detector 2 through the surface acoustic wave filter, and the signal detected by the image detector 2 is negatively received by the float detector 4. When the synchronization signal is detected, and when the broadcast signal according to the L broadcast method is received, the audio signal detected by the AM detector 6 is input to the FM / AM switching unit 7 so that the float detector 4 In addition to the selective output by the detected signal, the inverted image output signal of the phase inversion switching unit 3 is selectively outputted by the detection signal of the floating detector 4, and when receiving a broadcast signal according to the B / G broadcasting method. In addition to the non-inverted image output of the phase inversion switching unit 3, the audio signal detected by the FM detection unit 5 is input to the FM / AM switching unit 7 to be selectively output, and the signal detection unit 9 ID signal of the automatic detection of the image detector (2) A tuning signal (AFT) is input to the microcomputer 8 to perform a control operation required for automatic tuning.

The characteristics of each broadcasting method are as follows.

However, the conventional TV automatic tuning apparatus as described above detects only the floater and directly selects the phase inversion switching unit 3 and the FM / AM switching unit 7 to receive the weak electric field and input the white noise. Every time the screen is distorted, the FM / AM recognition may be wrong, and the signal detection unit 9 must be used separately, and B / G and L / L 'broadcasting methods cannot be detected in the presence or absence of signal recognition. The user has to switch between L broadcasting method and L 'broadcasting method separately, and it is cumbersome to use automatic tuning condition suitable for B / GL, L' broadcasting method when selecting. In the L broadcasting method, V → V → UHF, and in the L 'broadcasting method, the V bands must be tuned sequentially so that the time for tuning is unnecessarily long.

Accordingly, it is an object of the present invention to provide a TV automatic tuning apparatus capable of detecting both positive and negative polarizers in order to solve the above problems.

Another object of the present invention is to provide a TV automatic tuning method capable of automatically recognizing and processing a user selection method of the L broadcast method and the L 'broadcast method using the TV automatic tuning device.

TV automatic tuning apparatus of the present invention for achieving the above object, the synchronization signal and the floating signal is detected from the video detection signal, respectively, the synchronization to output the B / G broadcast type recognition signal and L / L 'broadcast method recognition signal, respectively And a detection and signal presence detection unit, and an automatic recognition processing unit for receiving the B / G broadcasting method recognition signal and the L / L 'broadcasting method recognition signal of the synchronous detection and signal presence detection unit and recognizing them, and controlling automatic tuning. It features.

The TV automatic tuning method of the present invention for achieving the above another object is to detect whether the B / G broadcast method recognition signal or L / L 'broadcast method recognition signal, if the B / G broadcast method recognition signal B / G broadcast method Executing a mode; In the above process, if the L / L 'broadcast mode recognition signal is compared, the auto-tuning voltage is compared with the first voltage (2.5V). If the auto-tuning voltage is greater than the first voltage, it is determined as mode 0, and the auto-tuning voltage is set to zero. If less than one voltage and the count value of the period is less than or equal to the predetermined value (10), the process of determining the mode 1, and then comparing the automatic tuning voltage with the second voltage (4.5V), the automatic tuning voltage is a second If it is larger than the voltage and the count value of the period is less than or equal to the predetermined value 10, it is recognized as the L 'broadcasting mode and the mode is executed. The auto-tuning voltage is greater than the second voltage and the count value of the period is a predetermined value ( 10) and above, if the mode 1 has passed through, it is characterized by consisting of the process of executing the mode to recognize the L-broadcast mode.

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

In the TV automatic tuning apparatus of the present invention, as shown in FIG. 2, a tuner 1 for tuning a broadcast signal received in the same manner as in the prior art and the output of the tuner 1 are respectively provided. Output of the image signal, the image detector (2), the FM detector (5), the AM detector (6), and the image detector (2) for detecting an FM signal and an AM signal. A phase inversion switching unit 3 for inverting the phase and an FM / AM switching unit 7 for selecting outputs of the FM detector 5 and the AM detector 5 are connected. A buffer amplifier 20 for amplifying the image detection signal as an input as well as detecting the floating air through the synchronization detection unit 4 ', and the synchronization unit detection unit 21 for detecting the synchronization signal from the amplified image detection signal. By further connecting the synchronous detection and signal presence detection unit 22 In addition, by receiving the output signal of the synchronous detection and signal presence detection unit 22 and automatically recognizes L, L 'broadcast recognition and its output is applied to the image detector (2) and AM detector (6) The L / L 'automatic recognition unit 24 and the PM / AM are automatically recognized, and their outputs are applied to the FM / AM automatic recognition unit 25 which is applied to the FM / AM switching unit 7 and the phase inversion switching unit 3. It consists of an automatic recognition processing unit 23 for controlling the automatic channel selection in accordance with the output of the synchronous detection and signal presence detection unit 22.

In more detail, the circuit configuration of the synchronous detection and signal carrier detection unit 22 will be described in detail. The buffer amplifier 20 has the image detection signal applied to a base, the collector is grounded, and the emitter has a power supply (Vcc) at one side. Comprising a transistor (Q1) connected to the resistor (R1) and the synchronous detector (21), the subcontractor detector (4 ') applied, the synchronous detector (21) is a capacitor (C1) connected to the emitter side of the transistor (Q1) ) And a resistor R2 connected in series thereto, a resistor R3 connected at one side to the resistor R2 at a first connection point, and a resistor R3 at which a power supply Vcc is applied, and a resistor at one side at the first connection point. R2 and R3, and the other side is a grounded resistor (R4), the base is connected to the first connection point, the emitter is grounded and the collector is applied to the power supply (Vcc) on one side (R5) and automatic recognition processing unit A transistor Q2 coupled to the The unit 4 'is a capacitor C2 connected to the emitter side of the transistor Q1 and a resistor R6 connected in series therewith, one side is connected to the resistor R6 at a second connection point, and the other side is a power supply Vcc. The capacitor (C3) is applied, one side is connected to the resistor (R6) and the capacitor (C3) at the second connection point, the other side is grounded resistor (R7), the base is connected to the second connection point, the collector Is a transistor (Q3) that is grounded through a resistor (R8) and is applied to the emitter (Vcc), a resistor (R10) connected in parallel through the resistor (R8) and a resistor (R9), and the base is the resistor ( It is connected to the connection point of R9) (R10) and the emitter is grounded, and the collector is composed of a resistor (R11) is applied to the power supply (Vcc) on one side and a transistor (Q4) connected to the automatic recognition processing unit 23, The operation of the present invention is as follows.

First, when the image detector 2 detects an image signal from the intermediate frequency output of the tuner 1 and outputs the image signal to the synchronous detection and signal presence detection unit 22, the synchronous detection and signal presence detection unit 22 outputs B /. If the signal is based on the G broadcast method, the float detector 4 'detects the float signal and inputs it to the B / G broadcast recognition terminal B / G of the automatic recognition processor 23, and broadcasts L / L'. If the signal is according to the scheme, the synchronous detection unit 21 detects the synchronous signal and inputs the L / L 'broadcasting system recognition terminal (L / L') of the automatic recognition processing unit 23 to receive B / G or L / L '. The broadcast method is detected.

As described above, when the automatic recognition processing unit 23 detects that the L / L 'broadcasting method is detected, the PM detection unit 6 detects the L / L' broadcasting method and then selectively outputs the signal through the FM / AM switching unit 7.

That is, in the L / L 'broadcasting mode detection state, the FM / AM switching unit (FM / AM) is output by the FM / AM output (FM / AM) of the signal detected by the AM detection unit (6). 7) outputs the signal detected by the FM detector 5 in the B / G broadcasting system detection state, and outputs the signal selected by the FM / AM switch 7. A non-inverted video signal is output in the B / G broadcast mode detection state, and an inverted video signal is output in the L / L 'broadcast mode detection state.

Meanwhile, the L / L 'broadcast mode recognition signal of the L / L' automatic recognition unit 24 is connected to the L or L 'broadcast mode selector terminals of the image detector 2 and the AM detector 6 to L. In the broadcast mode, the video intermediate frequency is detected at 33.9MHz and the audio intermediate frequency is selected at 40.4MHz.

In more detail with respect to the synchronous detection and signal presence detection unit 22 of FIG. 3 during the above operation, when the image signal is input to the transistor Q1 of the buffer amplifier 20, L / L '. In the broadcast method, since the signal is a positive polarity, only the synchronization signal portion is applied to the base of the transistor Q2 by the bias of the resistors R3 and R4 through the DC blocking capacitor C1 and the resistor R2. Since a synchronizing signal appears on the collector side of the transistor Q2, and in the video signal period, the transistor Q2 is turned off due to the set bias by the resistors R3 and R4, and the collector output side is held at the power supply Vcc potential. A synchronization signal is detected and input to the L / L 'broadcasting method recognition terminal L / L' of the automatic recognition processor 23.

On the other hand, when the signal input to the buffer amplifier 20 is a B / G broadcasting system, the base current through which the transistor Q3 is conducted flows in the vicinity of the synchronous signal because the signal is a negative signal. The synchronizing signal is obtained, and the synchronizing signal is inputted through the resistors R8-R10 and then inverted by the transistor Q4 to the B / G broadcasting mode recognition terminal B / G of the automatic recognition processor 23. It is possible to detect signal carriers at the same time as synchronous detection of each of B / G and L / L 'broadcasting methods, and to prevent malfunctions when receiving weak electric field or white noise.

In Fig. 5, the automatic tuning method is shown. As shown in Fig. 4, the auto-tuning voltage (AFT) characteristics of the BGL broadcasting method shown in Fig. 4 (b) and Fig. 4 (c) are shown. L 'Bassoon method uses different auto-tuning voltage characteristics. That is, it detects whether the B / G broadcast mode recognition signal or the L / L 'broadcast mode recognition signal, and if the B / G broadcast mode recognition signal, executes the B / G broadcast mode, and in the process, the L / L' broadcast mode If it is a recognition signal, the auto-tuning voltage is checked. If the auto-tuning voltage is greater than the first voltage, that is, 2.5 V (mode 0), the control proceeds directly to the step of checking the auto-tuning voltage immediately after step 2. If it is less than 2.5V, it is determined whether the count value is 10 or less, and if it is 10 or less, the automatic untuned voltage checking step 2 is performed. Here, the meaning of the count value is that the waveform having the automatic untuned voltage of 2.5V or less appears shortly as shown in (c) of FIG. 4, so that this period is counted to determine whether the predetermined number (for example, 10) or less is satisfied, and this is satisfied. If it is determined that the mode 1 has passed, it will proceed to the mode 2.

In the step 2 of checking the auto-tuning voltage, it is determined whether the auto-tuning voltage is greater than the second voltage, that is, 4.5V, and if it is large (mode 2; satisfies the condition that the auto-tuning voltage is 4.5V or more), the period is determined. 10 or less will be judged. If the count value is 10 or less (if the period of the mode 2 is short), the waveform diagram of FIG.

In addition, if the count value is determined to be greater than or equal to 10, it is determined whether or not the pod 0 is passed, and if the mode 0 is passed (if there is a process of going from 2.5V to 2.5V or more), the L broadcast method is recognized. .

That is, as shown in the waveform diagram shown in FIG. 4C, when mode 1 advances to mode 2 and the mode 2 counts to 10 or less (if the period is short), it is recognized as L broadcast mode. On the contrary, if mode 2 is counted 10 or more in the step 2 of checking the automatic untuned voltage, it is recognized as the waveform shown in FIG.

As described above, according to the present invention, it is possible to prevent the screen from being distorted or malfunction of the FM / AM by switching the phase shift and the FM and AM by detecting and using the synchronous and floating devices. It is convenient to use because the user does not need to select separately by selecting the broadcasting method and detecting the signal carrier, and it is possible to realize the high quality and high functionality of the TV by reducing the tuning time during the automatic tuning to about 1/3 of the conventional one.

Claims (6)

Synchronous detection and signal presence detection unit for detecting the B-G broadcast signal and the L / L 'broadcast method recognition signal by detecting the synchronous signal and the floating signal from the image detection signal, respectively, B and the synchronization detection and signal presence detection unit TV (TV) automatic tuning, characterized in that it comprises an automatic recognition processing unit for receiving the / G broadcasting method recognition signal and L / L 'broadcasting method recognition signal and controls the automatic tuning to the recognized broadcast mode. Device. 2. The apparatus of claim 1, wherein the synchronous detection and signal presence detection unit receives a buffer amplifier for receiving and amplifying the image detection signal, outputs a floating amplifier detection unit for detecting a float signal from an output signal of the buffer amplifier, and the slow amplifier. A television (TV) automatic tuning device, characterized in that it is composed of a synchronous detection unit for detecting the synchronous signal from the output signal. 3. The TV according to claim 2, wherein the buffer amplifier is configured with a transistor Q1 receiving the image detection signal at a base, a collector being grounded, and an emitter being powered through a resistor R1. Tuning device. The method of claim 2 or 3, wherein the synchronous detector detects the output side of the buffer amplifier via the capacitor (C1) and resistor (R2) to the base of the resistor (R4) and transistor (Q2), and supplies power to the connection point. And a power supply connected to the collector of the transistor (Q2) via a resistor (R5). 4. The float detector according to claim 2 or 3, wherein the floating detector detects the output side of the buffer amplifier through the capacitor C2 and the resistor R6 to the base of the resistor R6 and the transistor Q3 and at the connection point thereof. The power is applied through the condenser C3 and connected, and the power is connected to the emitter of the transistor Q3 so as to connect the collector to the resistor R8 and through the resistor R9. And a power supply connected to a base of a resistor (R10) and a transistor (Q4), the power being connected to the collector of the transistor (Q4) via a resistor (R11). Detecting whether the B / G broadcast mode recognition signal or the L / L 'broadcast mode recognition signal and executing the B / G broadcast mode if the B / G broadcast mode recognition signal; In the above process, if the L / L 'broadcast mode recognition signal is compared, the auto-tuning voltage is compared with the first voltage (2.5V). If the auto-tuning voltage is greater than the first voltage, it is determined as mode 0, and the auto-tuning voltage is set to zero. If less than one voltage and the count value of the period is less than or equal to the predetermined value (10), the process of determining the mode 1, and then comparing the automatic tuning voltage with the second voltage (4.5V), the automatic tuning voltage is a second If it is larger than the voltage and the count value of the period is less than or equal to the predetermined value 10, it is recognized as the L 'broadcasting mode and the mode is executed. The auto-tuning voltage is greater than the second voltage and the count value of the period is a predetermined value ( 10) The automatic TV tuning method of claim 1, wherein if the mode 1 has passed through, it is recognized as an L-broadcast method and the mode is executed.