KR930015731A - Pay TV input system of satellite broadcasting - Google Patents

Abstract

The present invention relates to a TV receiver capable of receiving pay TV broadcasting of satellite broadcasting. In the related art, the input circuit system of such a TV receiver does not have a frequency conversion function such as pay TV broadcasting so that a reception function for an external audio signal cannot be exhibited. Although the disadvantages of the present invention are caused, in the present invention, a video between the SIF unit 11 having an audio switch between the IF stage 23 and the speaker sp side, and the video between the IF stage 23 and the image processing stage 26 is provided. A frequency band conversion followed by an external audio video input stage 27 for providing an external audio video signal to the switching unit 25 and the SIF unit 11 and the video switching unit 25, respectively. The present invention provides a pay TV input system for pay broadcasting, which includes a decoder 12 that performs a function.

Description

Pay TV input system of satellite broadcasting

As this is a public information case, the full text was not included.

FIG. 3 is a block diagram of a TV receiver system circuit including a video audio switching unit according to the present invention, FIG. 4 is an embodiment of an audio input / output switching unit related to FIG. 3, and FIG. See also.

Claims (2)

A tuner 22 for converting an RF signal received through the antenna 21 into an intermediate frequency, an IF stage 23 for detecting and amplifying an intermediate frequency of video and audio output from the tuner 22, and An audio intermediate frequency stage 11 having an audio switching stage for separating an audio signal from the IF terminal 23 and selecting an external audio signal input from an RF audio signal and an external terminal, and a complex from the IF terminal 23; A video switching unit 25 which receives an image signal and outputs an RF image signal to Vout of an external signal input / output terminal SCART, and selects the RF image signal and an external image signal, and the image selected by the video switching unit 25 It is connected to the image processing stage 26 for processing a signal, the video switching unit 25 and the audio intermediate frequency stage 11 to send a video input (Vin), audio input (AI) and data switch (Ds) External to accept audio output (Ao), video output (Vo) Pay-TV input system of satellite broadcasting comprising an audio video input terminal (27) and a decoder (12) connected to the external audio video input terminal (27) to convert a frequency band of video and audio. The voice intermediate frequency stage 11 is a data switch to the voice output terminal (Ao) of the external signal input and output terminals by amplifying the RF voice signal by a voice intermediate frequency detection stage (11a) for detecting a voice intermediate frequency signal; An amplifier 11c for outputting regardless of the voltage state of the D / S, a buffer 11b connected between the voice intermediate frequency detector 11a and the amplifier 11c and acting as a buffer, and the amplifier ( 11c), the voice switching stage 11d switched according to the data switch (D / S) and the voice input state of the external signal input / output stage, and the volume of the switched voice signal are controlled and amplified and output to the speaker sp. Pay-TV input system of satellite broadcasting provided with a volume control amplifier (11e). ※ Note: This is to be disclosed by the original application.