KR0150697B1 - 3-channel private receiving apparatus for cable connector - Google Patents

Abstract

The present invention relates to a three-channel (CH3) dedicated receiver for a cable connector that allows only three channels of the high-frequency output of the cable connector to be dedicated. However, the conventional channel connector for a cable connector is a cable TV to a high-frequency cable. When connecting and using, the high-frequency output of the cable connector is limited to channel 3 or channel 4, so the broadcasting channel must be tuned through the tuner unit 1, so that the price by the tuner is increased and the tuner is a local oscillation frequency in a super heterodyne manner. And there is a possibility that the high frequency frequency exists to become an interference frequency, and there is a troublesome problem of only selecting channel 3 or channel 4 among several channels.

In order to solve the conventional problems, the present invention is provided with a SAW filter for filtering only the frequencies corresponding to three channels of the cable connector output, so that only three channels can be exclusively received without using a tuner. do.

Description

3-channel (CH3) dedicated receiver for cable connector

1 is a block diagram of a channel receiver for a conventional cable connector.

2 is a detailed block diagram of a conventional tuner.

3A is a characteristic graph of a conventional SAW filter unit.

(b) is a characteristic graph of a conventional high frequency amplification part.

4 is a block diagram of a three-channel dedicated receiver for the cable connector of the present invention.

(A) of FIG. 5 is a characteristic graph of the SAW filter part of the present invention.

(b) is characteristic graph of high frequency amplification part of this paper.

* Explanation of symbols for main parts of the drawings

101: high frequency amplifier 102: SAW filter unit

103: IF processor 104: image processor

105: voice processing unit

The present invention relates to a three-channel (CH3) dedicated receiver device for a cable connector to enable only three channels of the cable connector high-frequency output.

In the conventional channel connector for a cable connector, as shown in FIG. 1, the tuner unit 1 tunes a broadcast signal among the signals received by the antenna ANT, and a specific frequency band among the broadcast signals tuned to the tuner unit 1. Saw (Surface Acoustic Wave) filter unit for filtering 2, IF processing unit 3 processing the intermediate frequency (IF) filtered by the SAW filter unit 2 and voice of the intermediate frequency processing signal from the IF processing unit (3) An audio output unit 4 for transmitting a signal to the speaker 5, an image / deflection processor 6 for deflecting an image signal among the intermediate frequency processed signals, and an image output from the image / deflection processor 6 An image drive unit 7 for transmitting a signal to the CRT 12, and a vertical deflection unit 8 for transmitting a vertical signal among the signals deflected and output from the image / deflection processor 6 to the deflection yoke 11 of the CRT 12. And a horizontal signal of the deflected output signal to the deflection yoke 11 and the flyback transformer 10. Is composed of a horizontal deflection portion 9, a flyback transformer 10 for transmitting a high pressure to the high pressure portion of the CRT 12, and a microcomputer 13 for controlling each part of the system.

FIG. 2 is a detailed block diagram of a conventional tuner 1, which includes an RF amplifier 1A for amplifying a broadcast high frequency signal among signals received by an antenna ANT, and a high frequency signal amplified and output from the RF amplifier 1A. And a mixer 1B for mixing the oscillation frequency oscillated by the local oscillator (IC), and a band pass filter (BPF) 10 for receiving the mixed output frequency from the mixer 1B and filtering it to an intermediate frequency of 45.75 MHz. It consists of.

In the conventional channel connector for a cable connector, the broadcast channel information received by the antenna ANT by the control signal of the microcomputer 13 when the channel of the cable TV is tuned as shown in FIGS. When applied to (1), the RF amplifier 1A in the tuner section 1 amplifies and outputs the received broadcast channel information signal as shown in (b) of FIG. 3, thereby oscillating in the local oscillator (IC). The frequency of the broadcast channel is determined together with the received frequency, and is mixed and output through the mixer 18.

Accordingly, the band pass filter 1D receives the mixed output frequency from the mixer 2B and filters only the intermediate frequency of 45.75 MHz, which is the intermediate frequency, and outputs the SAW filter unit 2 as shown in FIG. As shown in the figure, the IF processor 3 processes the signal filtered by the SAW filter unit 2 and outputs a high frequency automatic gain adjustment loop by filtering and outputting only the intermediate frequency of 45.75 MHz among the broadcast signals tuned by the tuner unit 1. The gain is adjusted and the IF processor 3 outputs the intermediate frequency processed video signal.

In this way, the video signal output from the IF processor 3 is applied to the video / deflection processor 6 so that the video signal is deflected by the control signal of the microcomputer 13 and the CRT 13 through the video drive unit 7. At the same time, the image vertical signal output from the image / deflection processing section 6 is applied to the deflection yoke 11 of the CRT 13 through the vertical deflection section 8, and the image horizontal signal is transmitted to the horizontal deflection section 9. The flyback transformer 10 is applied to the deflection yoke 11 and the flyback transformer 10 by applying a high pressure to the high pressure portion of the CRT 12 to output the image from the image drive unit 7. Display the signal.

On the other hand, the speech signal processed by the intermediate frequency in the IF processor 3 is applied to the speaker 5 through the voice processor 4 and output to the outside.

However, in the conventional cable connector channel receiver, when the cable TV is connected to the cable connector with a high frequency cable, the high frequency output of the cable connector is limited to channel 3 or channel 4, so the broadcast channel must be tuned through the tuner unit 1. There is a problem that the price of the tuner is increased and the tuner has a local oscillation frequency and a high frequency frequency in a superheterodyne manner and thus becomes an interference frequency, and only the channel 3 or the channel 4 is selected among several channels.

The present invention is provided with a SAW filter for filtering only the frequencies that fit three channels of the cable connector output in order to solve such a conventional problem to enable the tuner to receive exclusively three channels without the present invention according to the accompanying drawings The composition and effect of the are described as follows.

First, the three-channel dedicated receiver for the cable connector according to the present invention includes a high frequency amplifier 101 for amplifying and outputting a broadcast signal received by the antenna ANT at a predetermined frequency band, and a high frequency amplifier 101. The SAW filter unit 102 receives the amplified output signal and outputs the filtered signal according to a specific frequency, which is the picture frequency of the three channels, and processes the intermediate frequency of the three channel picture frequencies filtered by the SAW filter unit 102. IF processor 103, an image processor 104 for processing video signals among intermediate frequency processed signals by IF processor 103, and a voice processor 105 for processing audio signals among intermediate frequency processed signals will not be described. 104A is the video / deflection processing unit, 104B is the video drive unit, 104C is the vertical deflection unit, 104D is the horizontal deflection unit, 104E is the flyback transformer, 104F is the deflection yoke, 104G is the CRT, 105A is the audio output unit, 105B is the speaker to be.

As shown in FIG. 4, the three-channel (CH3) signal of the cable connector high frequency output is first received by the antenna ANT and applied to the high frequency amplifier 101. The amplifying unit 101 amplifies the input three-channel broadcast signal and applies it to the SAW filter unit 102, thereby filtering out 61.25 MHz of the three-channel picture carrier as shown in FIG.

As such, since the picture carrier of the three channels filtered out by the SAW filter unit 102 is applied by the IF processor 103 to process the intermediate frequency, the image processor 104 processes only the video signal among the intermediate frequency processed signals, and the audio processor. 105 processes and outputs only the audio signal of the intermediate frequency processed signal.

That is, the high frequency amplification unit 101 maintains only the frequency characteristic of the 60-67 MHz band as shown in (b) of FIG. 5, and the SAW filter unit 102 has three channel picture carriers as shown in (a) of FIG. By filtering only the 25 25MHz portion is applied to the IF processing unit 103, the video signal is applied to the image processing unit 104 can receive only three channels of the high-frequency output of the cable connector.

As described above, the SAW filter unit has a special specification for filtering only the frequencies corresponding to the three channels of the high-frequency output of the cable connector, so that only three channels can be received without the need for a tuner, thereby improving the reliability of the product. have

Claims (1)

The high frequency amplifier 101 amplifies and outputs the broadcast signal received by the antenna ANT at a predetermined frequency band, and receives the signal amplified and output from the high frequency amplifier 101 to filter according to a specific frequency which is a picture frequency of three channels. The video signal among the signals processed by the SAW filter 103, the IF processor 103 for intermediate-processing the picture frequencies of the three channels filtered by the SAW filter 102, and the intermediate frequency processed by the IF processor 103. 3 channel (CH3) dedicated receiver for the cable connector consisting of an image processing unit 104 for processing a; and an audio processing unit 105 for processing an audio signal of the intermediate frequency processed signal.