KR19990049209A - Flexible receiver - Google Patents

Abstract

The present invention uses an RF signal that is not a signal of the baseband band to prevent deterioration of image quality, and an RF signal, which is encrypted and transmitted by a broadcasting station, is input to provide a reception device with a flexible, which can easily configure a circuit. A tuner to be tuned, a selector for selecting an encrypted IF signal output from the tuner, a decoder for controlling the signal selected by the selector to be decoded, and a signal input to the decoder to decode And a demodulator for demodulating the output signal of the selection unit and the output signal from the detection unit, and outputting the demodulated signal.

Description

Flexible receiver

The present invention relates to a receiving apparatus, and more particularly, to a receiving apparatus, in which a receiving circuit is simply configured because the signal is encrypted using an IF signal.

In general, the baseband frequency of the baseband communication uses a frequency of 0 to 10 MHz (MHz), when the broadcast station encrypts the signal, and FM-modulated transmission, the transmitted signal is about 400 MHz band The receiver changes the band back to the baseband communication band and receives the received band.

1 is a block diagram of a conventional receiving device according to the prior art.

The conventional receiver according to the prior art is a tuner unit 10 is a modulator (RF) signal, which is encrypted and transmitted from a broadcasting station, is demodulated by a selected signal and a baseband signal is output, and the tuner unit ( A decoder 12 which decodes the baseband signal outputted from 10), a circuit part 14 for controlling the baseband signal inputted to the decoder 12 to be decoded, and a microcomputer controlling the circuit part 14; 16).

When the modulated FM signal encrypted and transmitted from a broadcasting station is input, the tuner unit 10, which is a B / S tuner, receives the modulated FM signal. The demodulator outputs a baseband signal, and the baseband signal output from the tuner unit 10 is decoded by the decoder 12.

The baseband signal input from the decoder 12 is decrypted by the control in the circuit unit 14, which is an ASIC integrated circuit controlled by the microcomputer 16, and the decrypted normal video signal is decrypted. Is outputted from the decoder 12 and provided to the subscriber.

However, the baseband signal system decoded as described above has a problem in that an unstable screen is provided by the screen device of the subscriber, and the circuit configuration of the circuit unit to be decoded is complicated.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and the main object of the present invention is to prevent deterioration of image quality by using an IF signal rather than a baseband signal, and to improve the circuitry. A simple configurable cabling is to provide a receiver.

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

Figure 2 is a block diagram showing a flexible receiving device according to the present invention.

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

10, 20: tuner part 12, 22: decoding part

14: circuit portion 16, 23: micom

21: selector 24: detector

25: demodulator

A feature of the present invention for achieving the above object is a tuner unit to which the RF signal encrypted and transmitted from a broadcasting station is input and tuned, a selection unit for selecting an encrypted IF signal output from the tuner unit, and the selection unit; Decoder for controlling the signal selected in the decode, Micom for controlling the signal input to the decoder, Decoded video signal input section Decoded by the video signal detector and the output of the selector and the detector And a demodulator for demodulating the output signal at &lt; RTI ID = 0.0 &gt; and outputting the demodulated signal.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of a portable receiving apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram illustrating a receiving device with a flexible display according to the present invention.

The flexible receiver according to the present invention includes a tuner unit 20 to which an RF signal, which is encrypted and transmitted from a broadcasting station, is input and tuned, and an eye of an encrypted 479.5 MHz band output from the tuner unit 20. A selector 21 for selecting an IF signal, a decoder 22 for controlling the signal selected by the selector 21 to be decoded, and a microcomputer for controlling the signal to be decoded in the decoder 22. (23), the video signal detection unit 24 to which the video signal decrypted by the decoding unit 22 is input, and the output of the selection unit 21 and the output signal from the detection unit 24 are demodulated. And a demodulation section 25 for outputting the demodulated signal.

The following describes the operating state of the present invention configured as described above.

An RF (RF) signal composed of an image signal and an image signal, which is an FM modulated signal transmitted by a broadcasting station, is input to the tuner unit 20, so that tuning, that is, a required signal is selected, and the selected tuner unit 20 is selected. The signal selects the IF signal in the 479.5 MHz band without changing the baseband, that is, the baseband signal.

The signal selected by the selector 21 is encrypted and transmitted from a broadcasting station, so that the encrypted signal is decoded by the decoder 22, which is a circuit of an application specific semiconductor (ASIC) controlled by the microcomputer 23. That is, it is decrypted.

The video signal decoded by the decoder 22 is input to the video signal detector 24 and modulated by the tuner 20 to be applied with the signaled and tuned output of the selected unit 21. The video signal output from the detector 24 is demodulated by the demodulator 25 and applied to the screen device of the subscriber.

As described in detail above, the flexible receiving apparatus according to the present invention has an effect that the receiving circuit is simply configured by decrypting an encrypted signal using the IF signal.

The present invention is not limited to the above embodiments, and it is apparent that many modifications are possible by those skilled in the art within the technical spirit of the present invention.

Claims (1)

A tuner unit to which an RF signal encrypted and transmitted from a broadcasting station is input and tuned; A selection unit for selecting an encrypted IF signal output from the tuner unit; A decoder for controlling the signal selected by the selector to be decoded; A microcomputer that controls the signal input to the decoder to be decoded; A video signal detector for inputting a video signal decrypted by the decoder; And a demodulator for demodulating the output of the selector and the output signal from the detector and outputting the demodulated signal.