KR20060005498A - Method for tuning in broadcast reception system - Google Patents

Abstract

The present invention is to tune an AM signal in a broadcast receiving system. To this end, the present invention provides a method for tuning an AM signal of a different transmission method due to different AM reception ranges and AM step frequencies according to transmission methods in each country. Alternatively, after setting and registering the tuning condition of the audio signal to the storage medium in the broadcast receiving system, when the automatic tuning of the broadcast signal through the first tuner unit checks the transmission method of the received audio signal, the check result is the first transmission method In this case, the tuner tunes through the second tuner according to the preset AM reception range and the preset AM step frequency, and in the case of the second transmission method, it is adjusted according to the preset AM reception range and the preset AM step frequency. By tuning through 2 tuners, the AM signal can be tuned effectively according to the transmission method in the broadcast receiving system. will be.

Description

Tuning method of broadcast reception system {METHOD FOR TUNING IN BROADCAST RECEPTION SYSTEM}

1 is a block diagram of a tuning device suitable for tuning an AM signal according to an AM reception range and an AM step frequency of an AM signal corresponding to a transmission method of a broadcast signal in a broadcast reception system according to the present invention;

2 is a flowchart illustrating a process of setting and registering a tuning condition of an AM signal corresponding to a transmission method of a broadcast signal in a broadcast reception system according to the present invention;

3 is a diagram illustrating a menu screen for setting an AM reception range and an AM step frequency according to a transmission method of a broadcast signal in a broadcast reception system according to the present invention;

4 is a flowchart illustrating a process of tuning an AM signal according to an AM reception range and an AM step frequency of an AM signal corresponding to a transmission method of a broadcast signal in a broadcast reception system according to the present invention.

<Description of the symbols for the main parts of the drawings>

102 control unit 104 first tuner unit

104a: Modulator 104b, 108b: IF section

106: decoding unit 108: second tuner unit

108a: PLL section 110: storage medium

112: menu generator

The present invention relates to a tuning method of a broadcast reception system, and more particularly, to a tuning method of a broadcast reception system suitable for tuning an AM signal according to a transmission method of an audio signal received in a broadcast reception system.

As is well known, voice multiple broadcast is a broadcast that allows stereo broadcasting or bilingual broadcasting by simultaneously superimposing other voice signals on a voice carrier of a broadcast signal. Here, the broadcasting method for the voice signal is different for each country. The Americas adopts the Zenith method, which is an AM-FM method for AM-modulating a sub-channel in subcarriers, and in Korea and Europe, for the additional voice channel. A dual carrier (Dual-Carrier) method using a separate carrier is adopted.

Here, the AM-FM method Zenith method is adopted in the Americas, such as the United States, in the stereo method 2fH (for example, fH 15.7342KHz) is the second voice carrier, fH is a pilot signal (that is, voice Signal for determining whether the signal is multi-broadcasted), while in two-language broadcasts, a second voice carrier 5fH called SAP (Second Audio Program) is mixed with the first voice carrier and FM modulation is performed at 4.5 MHz. Will be sent.

In addition, the dual carrier method, which is a TV voice multiplexing method adopted in Korea and Europe, is 4.5 MHz for the first voice carrier and 4.72 MHz for the second voice carrier to minimize mutual interference between video and audio signals. FM modulation is transmitted. Here, the signal of the first voice carrier is used as a native language and the signal of the second voice carrier is used as a foreign language, and the pilot signal is AM-modulated and transmitted together with the carrier. For example, in the domestic broadcasting system, the pilot signal frequency indicating the broadcasting system transmits a pilot signal of 149.8 Hz for stereo broadcasting and 276 Hz for bilingual broadcasting.

On the other hand, NTSC transmission method uses FS (Frequency Synchronizing) method to tune and receive broadcast signal, which is AFT (Automatic Fine Tuning) voltage to tune the tuner of the receiver to the carrier frequency of each channel. It adopts the way to use. That is, after storing PLL (Phase Lock Loop) data for tuning the frequency of each channel in a memory inside the control unit of the broadcast receiving system, a user inputs a specific channel through a key input or the like. When selected, the control unit applies the PLL data of the selected channel to the tuner. The PLL is formed in the tuner to control the oscillation frequency of the voltage controlled oscillator according to the PLL data, thereby receiving the frequency signal of the channel selected by the user.

However, conventionally, the AM signal receiving range and AM step frequency are different according to transmission methods of each country (eg, Korea and North America) (for example, the AM signal receiving range in North America is 520-1710 KHz, and the AM step frequency is 10 KHz). Due to Korea's AM signal receiving range of 522-1611KHz and AM step frequency of 9KHz), products manufactured in one region cannot be tuned to AM signals in other regions, and therefore, There was a problem that the products are not compatible with each other.

Accordingly, the present invention is to solve the above problems of the prior art, the broadcast receiving system to check the transmission method of the broadcast signal broadcasting that can perform the tuning of the AM signal according to each AM receiving range and AM step frequency Its purpose is to provide a tuning method for a receiving system.

In order to achieve the above object, the present invention provides a tuning method of a broadcast receiving system having a plurality of tuners, the method comprising: setting and registering a condition for receiving AM signals in a storage medium of the broadcast receiving system; Checking the transmission method of the audio signal received when the broadcasting signal is automatically tuned through the tuner, and according to the AM reception range and AM step frequency of the preset AM signal corresponding to the first transmission method. Broadcasting reception including tuning through a second tuner unit, and tuning through a second tuner unit according to an AM reception range and AM step frequency of a preset AM signal corresponding to the transmission scheme when the transmission scheme is the second transmission scheme. Provides a tuning method for the system.

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

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

According to the present invention, unlike the conventional method in which the AM reception range and AM step frequency are different according to the transmission method of each country and the AM signal of the other transmission method cannot be tuned, in the broadcast reception system, the tuning condition of the audio signal to the storage medium After setting and registering, check the transmission method of the received audio signal when the automatic tuning of the broadcast signal through the first tuner unit, and if the check result is the first transmission method, the preset AM reception range and the preset AM step frequency corresponding thereto. The second tuner unit is tuned through the second tuner unit, and when the second transmission method is checked, the second tuner unit is tuned according to the preset AM reception range and the preset AM step frequency. It is easy to achieve the purpose in.

1 is a block diagram of a tuning device suitable for tuning an AM signal according to an AM reception range and an AM step frequency of an AM signal corresponding to a transmission method of a broadcast signal in a broadcast reception system according to the present invention. The first tuner unit 104, the modulator 104a, the IF unit 104b, the decoding unit 106, the second tuning unit 108, the PLL unit 108a, the IF unit 108b, the storage medium 110 And a menu generator 112.

Referring to FIG. 1, the control unit 102 performs overall operation control of a broadcast receiving system including a microprocessor, for example, and provides a control signal for tuning a broadcast signal during automatic search of a TV broadcast signal. Information on the transmission method of the broadcast signal provided to the first tuner unit 104 and provided from the decoding unit 106 (for example, SAP broadcast of AM-FM transmission and voice multiple broadcast of dual carrier transmission). Set the AM signal receiving range and AM step frequency accordingly. In addition, the control signal for tuning the AM signal is transmitted to the second tuner 108 according to the AM reception range and the AM step frequency of the set AM signal.

In addition, in the control unit 102, a key input for setting a reception condition (e.g., AM reception range, AM step frequency, etc.) of an AM signal is performed by a user using an input unit (not shown), for example, a remote controller or the like. If present, the control signal for generating a menu screen for setting the AM signal reception condition is transmitted to the menu generating unit 112, and thus the menu screen for setting the AM signal reception condition is displayed through a monitor (not shown). When the user inputs a key for setting and registering the AM signal reception condition, the controller 102 stores (records) the AM signal reception condition in a storage medium 110, for example, a memory.

The first tuner 104 is used at an input of a radio receiver and tunes to a frequency of a certain radio wave (or electric signal) to select and extract only the radio wave, and an electric pulse signal generated from a data processing device. Or an IF unit 104b for outputting an intermediate frequency by mixing the received radio frequency with an oscillation frequency and converting the received radio frequency into an oscillation frequency, which can be converted into an electrical signal of a modified form that can receive a bit and send it to a transmission link. And automatically search and tune the broadcast signal according to the control signal provided from the controller 102 to provide the tuned audio signal to the decoder 106.

In addition, the decoding unit 106 converts the compressed coded broadcast signal (broadcast program signal) of a specific channel into the original signal before encoding by using a decoding technique such as variable length decoding, inverse DCT, inverse quantization, motion compensation, or the like. Restore and transfer to the control unit 102. Here, the decoding unit 106 extracts information on the transmission method of the broadcast signal (for example, SAP broadcasting of AM-FM system, voice multiple broadcasting of dual carrier system, etc.) and delivers the information to the control unit 102.

Meanwhile, the second tuner 108 controls the oscillation frequency of the voltage controlled oscillator according to the control signal provided from the controller 102, thereby receiving a radio signal received from the PLL unit 108a for receiving the frequency signal of the channel selected by the user. And an IF unit 108b for outputting an intermediate frequency by mixing the frequency with the oscillation frequency, wherein each transmission scheme (eg, AM-FM scheme, dual carrier scheme) is output according to a control signal provided from the controller 102. Tune the AM signal according to the AM reception range and AM step frequency corresponding to. Here, the AM reception range of the AM-FM method is 520-1710KHz, the AM step frequency is 10KHz, the AM reception range of the dual carrier method is 522-1611KHz, and the AM step frequency is 9KHz.

Next, a process of setting and registering the conditions of the AM reception range and AM step frequency corresponding to the transmission method in the tuning apparatus of the broadcast reception system having the above-described configuration will be described.

2 is a flowchart illustrating a process of setting and registering a tuning condition of an AM signal corresponding to a transmission method of a broadcast signal in a broadcast reception system according to the present invention.

Referring to FIG. 2, in the reproduction mode of the broadcast receiving system (step 202), the control unit 102 uses the input unit (not shown), for example, a remote controller or the like, to receive AM signals (eg, It is checked whether there is a key input for setting the AM reception range, AM step frequency, etc. (step 204).

As a result of the check in the step 204, when there is a key input for setting the AM signal reception condition, the control unit 102 transmits a control signal for generating a menu screen to the menu generating unit 112, which is not shown. A menu screen for setting reception conditions of AM signals is displayed via the monitor (step 206). As an example, as shown in FIG. 3, the AM reception range and the AM step frequency are divided into North America (ie, AM-FM transmission) and Korea (ie, dual carrier transmission) to determine an AM signal reception condition. It is a figure which illustrates the menu screen for setting.

Then, the controller 102 checks whether or not the user sets and registers the AM signal reception condition through the menu screen displayed using an input unit (not shown) (step 208), and the key for setting and registering the AM signal reception condition. If there is an input, the received reception condition is set and registered in the storage medium 110, for example, the memory (step 210). Therefore, the AM reception range and the AM step frequency can be set and registered according to the transmission method of the broadcast signal.

Meanwhile, although setting and registering the AM signal reception condition according to the transmission method has been described, the reception condition of the AM signal can be changed according to the transmission method. In the case of the FM signal, the reception condition of the FM signal, for example, the FM reception range, Of course, the FM step frequency can also be registered and changed.

Next, in the process of tuning the AM signal according to the AM reception range and AM step frequency of the AM signal corresponding to the transmission method by checking the transmission method of the broadcast signal while setting and registering the AM signal reception condition as described above. Explain.

4 is a flowchart illustrating a process of tuning an AM signal according to an AM reception range and an AM step frequency of an AM signal corresponding to a transmission method of a broadcast signal in a broadcast reception system according to the present invention.

Referring to FIG. 4, in the standby mode of the broadcast receiving system (step 402), the user checks whether there is a key input for reproducing the broadcast signal using an input unit (not shown), for example, a remote controller. 404).

As a result of the check in step 404, when there is a key input for reproducing the broadcast signal, the controller 102 transmits a control signal for tuning the broadcast signal to the first tuner unit 104 to tune the broadcast signal. In step 406, the tuned broadcast signal is demodulated.

The demodulated signal extracts information on a transmission method of the broadcast signal through the decoding unit 106 and transmits the information to the control unit 102. On the other hand, the control unit 102 checks the transmission method according to the information on the transmission method provided from the decoding unit 106 (step 408).

As a result of the check in step 408, if the transmission scheme is A (i.e., the first transmission scheme), the controller 102 tunes according to the preset AM reception range and preset AM step frequency corresponding to A. The control signal is transmitted to the second tuner unit 108 to tune the AM signal (step 410). Here, A means NTSC AM-FM transmission method in North America.

On the other hand, if the transmission method is B (ie, the second transmission method) as a result of the check in the step 408, the control unit 102 according to the preset AM reception range and preset AM step frequency corresponding to B The control signal for tuning is transmitted to the second tuner unit 108 to tune the AM signal (step 412). Here, B means NTSC dual carrier transmission in the region of Korea. In addition, if transmission method A is an NTSC dual carrier transmission method in Korea, transmission method B may also be NTSC AM-FM transmission method in North America.

In addition, in the above-described embodiment, only the case of the AM signal has been described. In the case of the FM signal, the FM signal may be tuned to an FM reception range of 87.5-108 MHz and an FM step frequency of 0.1 MHz in the NTSC AM-FM and dual carrier systems. .

Accordingly, in the tuning apparatus of the broadcast reception system, the AM signal may be tuned according to the corresponding AM reception range and the AM step frequency according to the transmission method of the broadcast signal.

As described above, the present invention is different from the conventional method in which the AM reception range and AM step frequency are different according to the transmission method of each country and the AM signal of the other transmission method cannot be tuned. By tuning the AM signal according to the AM reception range and the AM step frequency of the preset AM signal corresponding to the transmission scheme, the broadcast reception system can effectively tune the AM signal according to the transmission scheme.

Claims (5)

A tuning method of a broadcast receiving system having a plurality of tuners, Setting and registering a reception condition of an AM signal in a storage medium of the broadcast reception system; Checking a transmission method of a received audio signal when the broadcast reception system automatically tunes a broadcast signal through a first tuner unit; When the transmission method is the first transmission method, tuning through a second tuner unit according to an AM reception range and an AM step frequency of a preset AM signal corresponding thereto; When the transmission method is the second transmission method, tuning through a second tuner unit according to an AM reception range and an AM step frequency of a preset AM signal corresponding thereto; Tuning method of a broadcast receiving system comprising a. The method of claim 1, The first transmission method is an AM-FM method of NTSC, and the second transmission method is a dual carrier method of NTSC. The method of claim 1, The AM reception range of the preset AM signal is 520-1710 KHz in the AM-FM scheme, 522-1611 KHz in the dual carrier scheme. The method of claim 1, The AM step frequency of the preset AM signal is a tuning method of a broadcast receiving system, characterized in that 10KHz in the AM-FM scheme, 9KHz in the dual carrier scheme. The method of claim 1, The method, In case of the FM signal, tuning of the broadcast reception system further comprising tuning the FM signal according to the FM reception range of 87.5-108 MHz and the FM step frequency of 0.1 MHz for any one of the first transmission method and the second transmission method. Way.

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