KR930019038A - Reception switching device for PAL-B / G and PAL-I type NICAM broadcasting - Google Patents

Abstract

The present invention relates to an apparatus for automatically switching the reception mode to listen to the corresponding NICAM broadcast according to a result of determining whether the PAL-B / G type NICAM broadcasting or the PAL-I type NICAM broadcasting is received by the TV receiver. According to the conventional NICAM broadcasting reception switching device, since the elements such as the tank coil and the oscillator are fixed to process only the NICAL data of the PAL-B / G method, the reception of the NICAM broadcasting broadcasted in the PAL-I method is impossible. In addition, since the PAL-1 type of NICAM broadcasting receiver must be separately provided, it is a factor of cost increase, and it is to solve the problem of the user's point of view that the inconvenience caused by the limitation of reception.

The present invention includes an oscillator and a filter selection means for enabling signal processing in accordance with the PAL-B / G and PAL-I type NICAM broadcasting, and the oscillator and filter selection according to the B / G or I type discrimination result. It is equipped with a means for controlling the broadcast switching mode to automatically control the reception mode, so that the convenience of watching TV, reasonable equipment operation and cost reduction can be applied to the reception control means of the NICAM signal in the PAL method.

Description

Reception switching device of PAL-B / G and PAL-Ⅰ method NICAM broadcasting

Since this is an open matter, no full text was included.

2 is a circuit diagram of a reception switching device for NICAM broadcasting according to the present invention.

3 is a flowchart showing a reception switching operation process of the present invention.

Claims (1)

A SIF stage 1 for outputting an audio intermediate frequency signal, a tank coil 2 for demodulating B / G system and NICAM broadcasting, a capacitor CO for demodulating NICAM broadcasting of I system, and the tank coil (2) or SIF control switching section 8 for selectively connecting the condenser CO to the SIF stage 1 to control the SIF signal output for B / G or I-type NICAM broadcasting, and at the SIF stage 1 Filter input switching unit 9 for selectively inputting the output NICAM data to B / G bandpass filter 3 or I bandpass filter 10, and B / G to extract B / G type NICAM sound data. A bandpass filter (3) and an Ibandpass filter (10) for extracting NIC system sound data of the I system, a demodulator (4) for QPSK demodulation of the NICAM sound from the filtered NICAM data, and a demodulator (4) for 5.85 MHz 1 oscillator for supplying the I / Q QPSK demodulation signal of 6.552 MHz to the B / G oscillator 5 and demodulator 4 for supplying the B / G system QPSK demodulation signal (11), and the oscillator switching unit 12 to selectively connect the B / G oscillator 5 or I oscillator 11 to the demodulator 4 to perform the B / G or I type sound demodulation; A NICAM sound decoder 6 for converting demodulated NICAM data into an analog signal and outputting a NICAM sound and a NICAM presence discrimination signal, and an output FM mono signal or a decoder of the SIF stage 1 under the control of the decoder 6. An output switching unit 7 for selectively outputting the output NICAM sound of FIG. 6 and supplying it to a voice amplifier, and a switching unit according to a B / G or I method by receiving a NICAM presence determination signal of the decoder 6 ( A reception switching device for a PAL-B / G and a PAL-I type NICAM broadcast composed of a microcomputer (13) which performs switching control of 8, 9, and 12).