KR20020088100A - Apparatus for receiving multimedia signal - Google Patents

Abstract

PURPOSE: An apparatus for receiving a multimedia signal is provided to improve performance by receiving only a signal inputted through a receiving antenna with an excellent signal selectivity. CONSTITUTION: A plurality of antennas(31) receive signals inputted from the outside. A tuner(32) is embedded in a case(300) installed in a receiver for performing a tuning operation of the receiver. A diversity module(33) electrically connects to a plurality of antennas(31) and the tuner(32) for comparing gains of the signals inputted from a plurality of antennas(31), selecting a receiving signal inputted from a specific antenna, and amplifying the selected receiving signal. A PLL(Phase Locked Loop)(34) connects to the diversity module(33) and the tuner(32) for automatically changing a gain of the diversity module(33) according to the input of an external signal, adjusting a receiving performance about a high-power or low-power signal, and adjusting the tuning of the tuner(32).

Description

Apparatus for receiving multimedia signal

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tuner device used for a multimedia receiver, and more particularly, to an integrated tuner used for a multi-channel receiver, in which a diversity circuit capable of selecting a reception antenna according to the magnitude of a signal applied from each outside In addition, the present invention relates to an integrated built-in tuner for a multimedia receiver for receiving only a signal input to a receiving antenna having good signal selectivity by enabling selection according to a direction or frequency of a receiving antenna.

As multimedia is developed, technology is rapidly progressing, and the performance of multimedia receivers for receiving audio and video signals is also improving. Accordingly, efforts to receive more accurate multimedia signals by improving the performance of the tuner used in the multimedia receiver are continuing.

1 is a block diagram of a multimedia signal receiving apparatus according to the prior art, a plurality of antennas 11 into which an external signal is input, a diversity module 12 for receiving an antenna by selecting an antenna according to an external signal, and An amplifier 13 for amplifying the signal transmitted from the diversity module 12, a bandpass filter 14 for passing only a signal of a desired frequency band, and oscillating a signal of a constant frequency to convert a frequency of the received signal The local oscillator 15, the signal mixer 16 for mixing the signal transmitted from the band pass filter 14 and the signal oscillated from the local oscillator 15, and the signal transmitted from the signal mixer 16. And an intermediate frequency amplifier 17 that amplifies the power.

FIG. 2 is a block diagram illustrating a detailed configuration of a multimedia signal receiving apparatus according to the prior art, and a description of the overlapping configuration of FIG. 1 will be omitted through description of the drawings.

A diversity module comprising a comparator 21 for selecting an antenna for receiving a signal according to an input of an external signal and an input amplifier 22 for amplifying the received signal selected by the comparator 21 in one module. 12), an input tuner 23 through which the signal amplified by the diversity module 12 passes only a desired frequency band, a tuner 24 amplify the signal passed by the input tuner filter 23, It consists of an RF tuner 25 which passes only a desired frequency band of the signal amplified by the tune amplifier 24, which is the same as the configuration of FIG.

1 and 2, the diversity module 12 is externally installed in the multimedia receiver in the tuner circuit, is connected to the tuner circuit by a cable, and has the most received gain among the external signals input to the antenna 11. Only this one big signal is selected. In addition, other devices except for the antenna 11 and the diversity module 12 are built in the integrated case 18.

The operation of the tuner for a multimedia receiver according to the prior art configured as described above will be described with reference to FIG.

First, the signals introduced through the plurality of antennas 11 are selected by comparing only the magnitude of the input gain in the comparator 21, and the selected received signal is amplified by the input amplifier 22 to be input tuner 23. The tuning amplifier 24 selects and amplifies a specific band, and only a desired channel band is tuned in the RF tuner 25. The tuned signal is mixed with the frequency oscillated in the local oscillator 15 and mixed in the signal mixer 16, converted into an intermediate frequency, and amplified and output through the intermediate frequency amplifier 17.

However, in the conventional tuner circuit for multimedia receiver, a diversity module must be additionally used to select a specific signal using a plurality of antenna circuits, and a comparator circuit based on an input signal cannot be operated in conjunction with the tuner circuit. There is a disadvantage, and there is a difficulty in matching with the tuner circuit because each module is connected by a cable (cable), there is a space disadvantage and installation problems separately installed outside the multimedia receiver equipped with the tuner.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object thereof is to form a diversity module integrally within a tuner circuit and to select a specific signal input from a plurality of input antenna circuits, and a diversity module and a tuning circuit. The present invention provides a built-in tuner circuit for a multimedia receiver with a phase-locked loop circuit adjustable for tuning and reception performance of a circuit.

1 is a block diagram of a multimedia signal receiving apparatus according to the prior art;

2 is a block diagram showing a detailed configuration of a multimedia signal receiving apparatus according to the prior art;

3 is a block diagram of a multimedia signal receiving apparatus according to the present invention;

4 is a block diagram showing a detailed configuration of a multimedia signal receiving apparatus according to the present invention.

<Explanation of symbols on main parts of the drawings>

31: antenna 32: tuner

33: Diversity Module 34: Phase Locked Loop

300: Case 41: Comparator

42: input amplifier 43: input synchronizer

44: tuning amplifier 45: RF tuner

According to a feature of the multimedia signal receiving apparatus according to the present invention for solving the above problems, a plurality of antennas for receiving a signal input from the outside of the multimedia receiver; A tuner unit which performs tuning and tuning operation of the receiver and is built in an integrated case installed in the receiver, and is electrically connected to the plurality of antennas and is embedded in the case and electrically connected to the tuner unit. A diversity unit configured to compare the gains of the signals input from the plurality of antennas and to select and amplify a received signal input to a specific antenna; Built in the case and connected to the diversity unit and the tuner unit, respectively, the gain of the diversity unit is automatically changed according to the input of an external signal to adjust the reception performance of the high power or low power signal, and to adjust the tuning of the tuner unit. It consists of a phase tuning loop part.

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

3 is a block diagram of a multimedia signal receiving apparatus according to the present invention, comprising: a plurality of antennas 31 for receiving a signal input from the outside; A tuner 32 embedded in the integrated case 300 which performs tuning or tuning operation of the receiver and is installed in the receiver, and is electrically connected to the plurality of antennas and simultaneously embedded in the case 300 and tuner 32. A diversity module (33) electrically connected to the plurality; It is embedded in the case and connected to the diversity module 33 and the tuner 32, respectively, and automatically adjusts the gain of the diversity module 33 according to the input of an external signal to adjust the reception performance of the high or low power signal. And a phase locked loop (PLL) 34 for adjusting the tuning of the tuner section.

The tuner includes an RF amplifier 32a for amplifying the signal transmitted from the diversity module, a bandpass filter 32b for passing only a desired frequency band of the signal amplified by the RF amplifier, and the bandpass filter 32b. Local oscillator 32c oscillating a signal of a constant frequency to convert the frequency of the signal through the signal of the band pass filter 32b and the signal of the local oscillator 32c by mixing the signal of the local oscillator (32c) to convert into a signal A mixer and an intermediate frequency amplifier 32e for amplifying the intermediate frequency signal converted by the signal mixer 32e.

FIG. 4 is a block diagram showing a detailed configuration of a multimedia signal receiving apparatus according to the present invention, and description of the overlapping configuration with FIG. 3 will be omitted through description of the drawings.

A diver comprising a comparator 41 for selecting an antenna 31 for receiving a signal according to an input of an external signal and an input amplifier 42 for amplifying the received signal selected by the comparator 41 in one module. A city module 33, an input tuner 43 for passing the signal transmitted from the diversity module 33 only a desired frequency band, and a tuner 44 for amplifying the signal passed by the input tuner 43; And an RF tuner 45 for tuning a channel band by passing only a desired frequency band of the signal amplified by the tune amplifier 44, which is the same as the configuration of FIG.

Phase-locked loops (PLL, 34) are electrically connected to the comparator 41 and the input amplifier 42 to adjust the antenna selection of the comparator and automatically change the gain of the input amplifier in accordance with the input of an external signal to achieve high or low power. Adjust the reception performance for the signal, and adjust the tuning of the tuner.

The operation of the multimedia signal receiving apparatus according to the present invention configured as described above will be described with reference to FIG.

The signals input through the plurality of antennas are selected by comparing the magnitude of the input gain in the comparator 41, and only the large signal is selected, and the selected signal is amplified by the input amplifier 42. At this time, the amplifier gain can be adjusted according to the device. The phase-locked loop, an automatic gain control circuit, can be used to adjust the reception performance for high or low power signals. Of course, the reception performance of the input signal can be adjusted manually.

The selected and amplified signal is selected and amplified for a specific frequency band by the input tuner 43 and the tuning amplifier 44, and is tuned to the desired channel band by the RF tuner 45. The tuned signal is mixed with the frequency oscillated in the local oscillator 32c and the signal mixer 32d, converted into an intermediate frequency, and amplified and output through the intermediate frequency amplifier 32e.

The multimedia signal receiving apparatus of the present invention configured as described above has a diversity circuit for selecting a receiving antenna according to the size of a signal applied from each outside in a tuner used for multiple channels of a multimedia receiver and directing the reception antenna. In addition, by configuring the circuit to allow selection according to the frequency, the performance of the receiving device can be improved by receiving only the signal input to the receiving antenna having good signal selectivity, and the integrated structure can reduce the space of the receiving device. In addition, there is an effect that can be easily installed.

Claims (2)

A plurality of antennas for receiving a signal input from an outside of the multimedia receiver; A tuner unit which performs tuning and tuning operation of the receiver and is built in an integrated case installed in the receiver, and is electrically connected to the plurality of antennas and is embedded in the case and electrically connected to the tuner unit. A diversity unit configured to compare the gains of the signals input from the plurality of antennas and to select and amplify a received signal input to a specific antenna; Built in the case and connected to the diversity unit and the tuner unit, respectively, the gain of the diversity unit is automatically changed according to the input of an external signal to adjust the reception performance of the high power or low power signal, and to adjust the tuning of the tuner unit. Multimedia signal receiver, characterized in that the phase tuning loop portion. The method of claim 1, The diversity unit includes a comparator for selecting a received signal and an amplifier for amplifying the power of the signal selected by the comparator, wherein the phase-locked loop part is connected to the comparator and the amplification part, respectively. Integrated tuner device for use.