KR100757446B1 - Digital broadcasting receiving terminal and method for enhancing a receive sensitivity thereof - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable terminal, and more particularly, to a digital broadcast receiving terminal and a method for improving reception sensitivity thereof, which can improve digital broadcast receiving performance. To this end, the present invention is a wireless communication unit for processing the voice signal for the incoming call from the main antenna, and transmits the voice signal for the call origination to the main antenna; First and second low noise amplifiers are respectively connected to the main antenna and the diversity antenna, and a low noise amplifier connected to an input / output terminal of the first and second low noise amplifiers by a cascade-type switch is used to provide a digital signal through the low noise amplifier. A digital broadcast processor for demodulating and decoding broadcast signals (video and audio signals); A memory storing programs for controlling the digital broadcasting processor and measuring reception sensitivity in the digital broadcasting mode; In the digital broadcasting mode, the digital broadcasting processor controls the digital broadcasting processor by setting or executing a reception sensitivity improving mode, and measures the reception sensitivity accordingly, and the digital signal processor uses the low noise amplification path of the digital broadcasting processor for the best reception sensitivity among the measured reception sensitivity. It is configured to include a control unit for controlling the broadcast reception path.

Description

Digital broadcast receiving terminal and its reception sensitivity improving method {DIGITAL BROADCASTING RECEIVING TERMINAL AND METHOD FOR ENHANCING A RECEIVE SENSITIVITY THEREOF}

1 is a configuration diagram showing only the configuration of a receiving side of a conventional digital broadcast receiving terminal.

2 is a block diagram showing the internal configuration of a digital broadcast receiving terminal according to an embodiment of the present invention.

3 is a block diagram showing the internal configuration of the digital broadcast processor in FIG.

4 is a flowchart illustrating a method for improving reception sensitivity of a digital broadcasting reception terminal according to an embodiment of the present invention.

*** Explanation of symbols for main parts of drawing ***

20: low noise amplifier 21: duplexer

22: wireless communication unit 23: digital broadcast processing unit

23a: first low noise amplifier 23b: second low noise amplifier

24: audio processor 25: keypad

26: memory 27: control unit

28: display unit ANT1: main antenna,

ANT2: diversity antenna MIC: microphone

SPK: Speaker

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable terminal, and more particularly, to a digital broadcast receiving terminal and a method for improving reception sensitivity thereof, which can improve digital broadcast receiving performance.

In general, digital content refers to video and audio data recorded digitally. The digital content may be stored in a predetermined recording medium (eg, magnetic tape, CD-ROM, hard disk, IC memory, etc.), but also widely downloaded through wired / wireless networks (eg, Internet, broadcasting, etc.). It is becoming.

In recent years, digital broadcasting has started in earnest, and users can selectively select a plurality of broadcasting channels provided through predetermined digital broadcasting by using a digital broadcasting receiving terminal to watch various digital contents provided by the corresponding broadcasting channels.

Such a conventional digital broadcast receiving terminal is provided with a diversity antenna so as to watch digital broadcasting with improved reception sensitivity, thereby providing digital reception with improved reception sensitivity. Referring to the conventional digital broadcast receiving terminal with reference to the accompanying drawings as follows.

1 is a block diagram showing only a configuration of a receiver of a conventional digital broadcasting receiver.

Referring to FIG. 1, a diversity structure of a digital broadcasting reception terminal for digital broadcasting uses low noise amplifiers LNA1 and LNA2 11 and 12 for the main antenna ANT1 and the diversity antenna ANT2, respectively. do. Normally, only one low noise amplifier (11 or 12) is operated, and if the sensitivity decreases, the other low noise amplifier (12 or 11) is operated to improve the sensitivity using the two low noise amplifiers (11, 12). The method is used. The digital broadcast signal amplified by the low noise amplifiers 11 and 12 is input to the tuner 13.

However, the method of improving the reception sensitivity of the conventional digital broadcasting receiver terminal is to select a single antenna having a good reception sensitivity among the main antenna or the diversity antenna and service the digital broadcasting signal received through the selected antenna. It was only. Therefore, when the reception sensitivity of the digital broadcast is poor in both the main antenna and the diversity antenna, the reception sensitivity cannot be improved, so that the digital broadcasting in a bad state must be viewed.

Accordingly, an object of the present invention is to provide a digital broadcast receiving terminal and a method for improving reception sensitivity thereof, which can be used to solve the above problems and to improve digital broadcast receiving performance.

It is also an object of the present invention to provide a digital broadcast receiving terminal and a method for improving the reception sensitivity of the digital broadcast receiver to amplify the received digital broadcast signal a plurality of times through a plurality of amplifiers to improve reception sensitivity.

In addition, another object of the present invention is to change the cascade structure of a plurality of low-noise amplifiers consisting of a cascade structure, amplify the received digital broadcast signal to service digital broadcasting with a cascade structure of a plurality of low-noise amplifiers having the best reception sensitivity. It is to provide a digital broadcast receiving terminal and a method for improving the receiving sensitivity to improve the.

The present invention for achieving the above object, the wireless communication unit for processing the voice signal for the incoming call from the main antenna, and transmits the voice signal for the call origination to the main antenna;

First and second low noise amplifiers are respectively connected to the main antenna and the diversity antenna, and a low noise amplifier connected to an input / output terminal of the first and second low noise amplifiers by a cascade-type switch is used to provide a digital signal through the low noise amplifier. A digital broadcast processor for demodulating and decoding broadcast signals (video and audio signals);

A memory storing programs for controlling the digital broadcasting processor and measuring reception sensitivity in the digital broadcasting mode;

In the digital broadcasting mode, the digital broadcasting processor controls the digital broadcasting processor by setting or executing a reception sensitivity improving mode, and measures the reception sensitivity accordingly, and the digital signal processor uses the low noise amplification path of the digital broadcasting processor for the best reception sensitivity among the measured reception sensitivity. It characterized in that it comprises a control unit for controlling the broadcast reception path.

The present invention also provides a first low noise amplifier connected to the main antenna, a second low noise amplifier connected to the diversity antenna, and the input and output terminals of the first and second low noise amplifiers are cascaded. In the method for improving the reception sensitivity of the digital broadcasting receiver connected by

In the digital broadcasting mode, switching a cascade structure switch to vary a low noise amplification path and to measure reception sensitivity;

Comparing the measurement results of the reception sensitivity, and based on the comparison result to identify the best low noise amplification path characterized in that the process of processing the digital broadcast signal received digital broadcast signal in the corresponding low noise amplification path characterized in that the process of the digital broadcast.

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

It should be noted that in the following description, only parts necessary for understanding the operation and operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

In the following description, specific details of the digital broadcasting reception terminal and the method for improving reception sensitivity thereof are shown to provide a more comprehensive understanding of the present invention. It will be apparent to one of ordinary skill in the art that the present invention may be readily practiced without these specific details and also by their modifications.

Meanwhile, an embodiment of the present invention proposes that the first and second low noise amplifiers may be cascaded using a switching low noise amplifier to improve the reception sensitivity of digital broadcasting by utilizing the advantages of the cascade. Accordingly, in the embodiment of the present invention, the input and output terminals of the first and second low noise amplifiers are connected to each other by the switch of the cascade structure so that the two low noise amplifiers have a cascade structure.

Thus, the digital broadcasting is received using only one of the main antenna and the diversity antenna having good reception sensitivity, or the low noise amplified signal by the first low noise amplifier is once again low noise amplified by the second low noise amplifier using the cascade structure. Receive digital broadcasting with the best structure.

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

2 is a block diagram showing the internal configuration of a digital broadcast receiving terminal according to an embodiment of the present invention.

Referring to FIG. 2, the duplexer 21 shares the main antenna ANT1 so that the voice signal for the call origination and the received digital broadcast signal can be radiated without mutual interference.

The wireless communication unit 22 processes the voice signal for the incoming call from the duplexer 21, processes the voice signal for the call origination, and transmits the voice signal to the duplexer 21. The wireless communication unit 22 includes an RF transmitter for upconverting and amplifying a frequency of a transmitted signal, an RF receiver for low noise amplifying and downconverting a received signal, and encoding and modulating the transmitted signal. And a codec for demodulating and decoding the signal. The codec includes a data codec for processing packet data and an audio codec for processing an audio signal such as voice.

The digital broadcast processor 23 demodulates and decodes a digital broadcast signal (video and audio signal) received from the duplexer 21 to process the digital broadcast signal. Here, the internal configuration of the digital broadcast processor 23 will be described in detail below.

The audio processor 24 reproduces the received audio signal output from the wireless communication unit 22 and outputs it to the speaker SPK or transmits the transmission audio signal generated from the microphone MIC to the wireless communication unit 22. Do this. In addition, the audio processor 24 outputs the audio signal of the digital broadcast signal received according to the digital broadcast mode to the speaker SPK.

The keypad 25 has keys for inputting numeric and text information and function keys according to the digital broadcast mode.

The memory 26 may be composed of a program memory and a data memory. The program memory stores programs for controlling a general operation of the digital broadcasting reception terminal. In the program memory, in the digital broadcasting mode, the digital broadcasting processing unit 23 controls the reception sensitivity and performs the digital broadcasting mode under the control condition of the digital broadcasting processing unit 23 having the best reception sensitivity. Programs are stored. In addition, the data memory temporarily stores data generated during the execution of the programs. In addition, the data memory may store digital broadcast data.

The control unit 27 performs a function of controlling the overall operation of the digital broadcasting reception terminal. In addition, the control unit 27 controls the digital broadcasting processing unit 23 (outputs a switching control signal) by measuring or setting the reception sensitivity improvement mode in the digital broadcasting mode, and measures the received sensitivity. Among them, the control state of the digital broadcasting processor 23 having the best reception sensitivity is maintained as it is.

The display unit 28 displays messages generated during program execution under the control of the control unit 27. In addition, the display unit 28 displays the screen data according to the operation of the reception sensitivity improvement mode. In addition, the display unit 28 may include an LCD controller, a memory capable of storing image data, and an LCD display device. In this case, when the LCD is implemented by using a touch screen method, the keypad 25 and the LCD may be input units.

3 is a block diagram showing the internal configuration of the digital broadcast processor in FIG.

Referring to FIG. 3, the low noise amplification unit 20 performs a low noise amplification flow of the digital broadcast signal received through the main antenna ANT1 or the diversity antenna ANT2 by a switching control signal output from the controller 27. Variable and low noise amplification.

The tuner 23c demodulates and decodes the digital broadcast signal amplified by the low noise amplifier 20, and outputs the demodulated and decoded signal to the controller 27.

Here, the low noise amplifier 20 is a device block for improving the reception sensitivity of the present invention, and is configured to enable the following operations.

First, the first and second low noise amplifiers 23a and 23b and the cascade structure switches SW1 and SW2 connected to the input / output terminals of the first and second low noise amplifiers 23a and 23b are constituted.

Thus, the cascade switches SW1 and SW2 are switched by the switching control signal of the controller 27 to low noise amplify the digital broadcast signal received by the main antenna ANT1 through the first low noise amplifier 23a.

Alternatively, the digital broadcast signal received by the main antenna ANT1 by the switching control signal is amplified through the first and second low noise amplifiers 23a and 23b.

Alternatively, the digital broadcasting signal received by the diversity antenna ANT 2 by the switching control signal is low noise amplified by the second low noise amplifier 23b.

Alternatively, the digital broadcasting signal received by the diversity antenna ANT2 by the switching control signal is amplified through the second and first low noise amplifiers 23b and 23a.

Referring to FIGS. 2 and 3, the operation of the digital broadcasting receiver for reception sensitivity improvement will be described. When the digital broadcasting mode is executed in response to a key input of the keypad 25, the control unit 27 performs a main antenna ANT1. The digital broadcasting signal is received through the diversity antenna ANT2. At this time, the control unit 27 sequentially controls the switches SW1 and SW2 of the cascade structure of the digital broadcasting processing unit 23 by the switching control signal when the reception sensitivity improvement mode is set or when the reception sensitivity improvement mode is executed. Here, the control of the cascade-structured switches SW1 and SW2 in order to confirm whether the reception sensitivity is the best in any switch state.

Subsequently, the controller 27 sequentially controls the low noise amplifier 20 of the digital broadcast processor 23 according to various cases to perform the digital broadcast mode with the signal flow path having the best reception sensitivity. An image is displayed on the display unit 28. In addition, the audio according to the digital broadcast is output to the speaker (SPK) through the audio processor 24.

4 is a flowchart illustrating a method for improving reception sensitivity of a digital broadcasting reception terminal according to an embodiment of the present invention.

Referring to FIG. 4, in step 401, the control unit 27 determines whether the digital broadcasting mode is provided so that the digital broadcasting signal can be viewed.

In step 403, the control unit 27 determines whether the reception sensitivity improvement mode is set or the execution of the reception sensitivity improvement mode is requested.

Accordingly, when the reception sensitivity improvement mode is set or executed, the controller 27 switches the cascade structure switch to change the low noise amplification path and measure the reception sensitivity. At this time, the control unit 27 controls (on / off) the first and second switches SW1 and SW2 to vary the low noise amplification path and measure reception sensitivity.

Then, in step 407, the control unit 27 compares the received sensitivity measured by varying the low noise amplification path.

Based on the comparison result, in step 409, the control unit 27 checks the corresponding low noise amplification path having the best reception sensitivity, and proceeds to step 411 in which the first and second switches SW1 and SW2 become the low noise amplification path. To control.

Thus, in step 413, the controller 27 processes the digital broadcast signal received through the corresponding low noise amplification path to service the digital broadcast.

If the reception sensitivity improvement mode is not set or executed in step 403, in step 415, the control unit 27 receives a digital broadcast signal using a low noise amplification path having a cascade structure, and then amplifies a low noise signal. Enable broadcast service.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

As described in detail above, the present invention changes the cascade structure of a plurality of low noise amplifiers having a cascade structure and amplifies the received digital broadcast signal to control the digital broadcasting receiver terminal with the cascade structure of the plurality of low noise amplifiers having the best reception sensitivity. Therefore, it is effective to service digital broadcasting with the best reception sensitivity to users.

Claims (5)

A wireless communication unit which processes a voice signal for incoming call from the main antenna and transmits a voice signal for outgoing call to the main antenna; First and second low noise amplifiers are respectively connected to the main antenna and the diversity antenna, and a low noise amplifier connected to an input / output terminal of the first and second low noise amplifiers by a cascade-type switch is used to provide a digital signal through the low noise amplifier. A digital broadcast processor for demodulating and decoding a broadcast signal; A memory storing programs for controlling the digital broadcasting processor and measuring reception sensitivity in the digital broadcasting mode; In the digital broadcasting mode, the digital broadcasting processor controls the digital broadcasting processor by setting or executing a reception sensitivity improving mode, and measures the reception sensitivity accordingly, and the digital signal processor uses the low noise amplification path of the digital broadcasting processor for the best reception sensitivity among the measured reception sensitivity. And a control unit for controlling a broadcast reception path. delete The method of claim 1, wherein the low noise amplifier, The switch of the cascade structure is switched by the switching control signal of the controller to low noise amplify the digital broadcast signal received by the main antenna through the first low noise amplifier, Amplifying the digital broadcast signal received by the main antenna through the first and second low noise amplifiers, Low noise amplification of the digital broadcast signal received by the diversity antenna through the second low noise amplifier, And a digital broadcasting signal received by the diversity antenna through a second and first low noise amplifier. The first low noise amplifier is connected to the main antenna, the second low noise amplifier is connected to the diversity antenna, and the reception sensitivity of the digital broadcasting receiving terminal in which the input / output terminals of the first and second low noise amplifiers are connected by a cascade switch is improved. In the way, In the digital broadcasting mode, switching a cascade structure switch to vary a low noise amplification path and to measure reception sensitivity; Comparing the measurement results of the reception sensitivity, identifying the best low noise amplification path based on the comparison result, and processing the digital broadcasting signal by processing the received digital broadcasting signal according to the low noise amplification path. Receiving sensitivity improvement method of the receiving terminal. The method of claim 4, wherein the receiving sensitivity is measured. Measuring reception sensitivity of a low noise amplification path for low noise amplifying the received digital broadcast signal received through the main antenna by a first low noise amplifier; Measuring reception sensitivity of a low noise amplification path for low noise amplifying a received digital broadcast signal received through a diversity antenna in a second low noise amplifier; Measuring reception sensitivity of a low noise amplifying path for low noise amplifying a received digital broadcast signal received at the main antenna and amplified by the first low noise amplifier; Measuring a reception sensitivity of a low noise amplification path received by the diversity antenna and amplified by the second low noise amplifier by a low noise amplification path received by the first low noise amplifier. How to improve reception sensitivity.

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