Multivoice broadcast search method and apparatus in NICAM broadcasting receiver

Claim 2

A multivoice broadcast search method in a NICAM broadcasting receiver, comprising the steps of : determining whether the present broadcast is a multivoice broadcast or not, so as to store the present broadcasting state when the present broadcast is the multivoice broadcast, and to end an operation when the present broadcast is not the multivoice broadcast ; searching each of language broadcasts of the multivoice broadcast by setting values of predetermined control signals to predetermined values, holding each of the set control signals for a predetermined time and outputting each of language broadcasting signals sequentially for each of the held times in the course of the multivoice broadcast ; and returning to the present stored broadcasting state after performing the multivoice broadcast searching step so as to output a language broadcast according to the stored broadcasting state.

Claim 3

The multivoice broadcast search method as claimed in claim 1, wherein said multivoice broadcast searching process comprises the steps of : searching a first language by setting the values of the predetermined control signals to the predetermined values, holding the values of the predetermined control signals for a predetermined time, and then confirming that the user's selection key information are inputted to a microcomputer through a key matrix circuit, with the result that if the user's selection key information are inputted to the microcomputer, a general operation of the receiver is performed, and if not, a subsequent process is performed; searching a second language where the same process as that of said first language searching step is performed, but the values of the predetermined control signals set in the microcomputer are different; checking a number of the broadcasting languages in the multivoice broadcast by confirming the broadcasting state recognition signal, with the result that if the number of the broadcasting languages is equal to or more than "3", a subsequent process is performed, and if the number of the broadcasting languages is less than "3", the original broadcasting signals are outputted; and searching a third language where the same process as that of said first language searching step is performed, but the values of the predefermined control signals set in the microcomputer are different, when the number of the languages is equal to or more than "3" in checking said numbers of the broadcasting languages.

Claim 4

The multivoice broadcast search method as claimed in claim 1, further comprising the steps of : supplying a tuning signal to a tuner and demodulator in accordance with the user's selected channel information received by the microcomputer; and setting a logic value of the past multivoice broadcast recognition signal among the broadcasting state recognition signals supplied to the microcomputer to "0", so as to recognize that the past broadcasting signal before changing the channel is not a multivoice broadcast, whereby it is capable of being applied when a broadcasting state of the user's selected channel in the course of receiving and ony of the various broadcasting channels is a multivoice broadcast.

Claim 5

A multivoice broadcast search apparatus in a NICAM broadcasting receiver comprising: a tuner and demodulator connected to an antenna and for selecting a viewer's desired frequency signal among radio frequency signals received from the antenna in accordance with a tuning signal inputted at a tuning signal input terminal, outputting NICAM broadcasting signals and simultaneously demodulating FM modulated signals so as to output FM audio signals ; a NICAM decoder and D/A converter connected to one output terminal of the tuner and demodulator and for decoding the NICAM broadcasting signals outputted from the tuner and demodulator, converting the decoded digital signals into analog signals, outputting PCM L-channel signals and PCM R-channel signals and simultaneously outputting broadcasting statej recognition signals ; first switching means having first input terminals at which the PCM L-channel signals outputted from the NICAM decoder and D/A converter are inputted, second input terminals at which the FM audio signals outputted from the tuner and demodulator are inputted and first output terminals changed and connected to the first or the second input terminals according to a first switching control signal and for selecting the PCM L-channel signals and the PCM R-channel signals, or the FM audio signals ; second switching means having a third input terminals each connected to the first output terminals of the first switching means, and a second output terminal changed and connected to one of the third input terminals according to a second switching control signal and for selecting a single output; third switching means having fourth input terminals each connected to the first output terminals of the first switching means, and a third output terminal changed and connected to one of the fourth input terminals according to a third switching control signal and for selecting a single output; a microcomputer for supplying the first to third switching control signals to the first to third switching means according to the broadcasting state recognition signals supplied from the NICAM decoder and D/A converter, and outputting the tuning signal and the first to third switching control signals according to the viewer's selected signal at a key matrix circuit coupled to the micro computer; and output means connected to the second output terminal and the third output terminal respectively, and for outputting an audio L-channel signal and an audio R-channel signal respectively.

Claim 6

A multivoice broadcast search apparatus in a NICAM broadcasting receiver comprising: a tuner and demodulator connected to an antenna and for selecting a viewer's desired frequency signal among radio frequency signals received from the antenna in accordance with a tuning signal inputted at a tuning signal input terminal, outputting NICAM broadcasting signals and simultaneously demodulating FM modulated signals so as to output FM audio signals ; a NICAM decoder and D/A converter connected to one output terminal of the tuner and demodulator and for decoding the NICAM broadcasting signals outputted from the tuner and demodulator, converting the decoded digital signals into analog signals, outputting PCM L-channel signals and PCM R-channel signals and simultaneously outputting broadcasting statej recognition signals ; first switching means having first input terminals at which the PCM L-channel signals outputted from the NICAM decoder and D/A converter are inputted, second input terminals at which the FM audio signals outputted from the tuner and demodulator are inputted and first output terminals changed and connected to the first or the second input terminals according to a first switching control signal and for selecting the PCM L-channel signals and the PCM R-channel signals, or the FM audio signals ; second switching means having a third input terminals each connected to the first output terminals of the first switching means, and a second output terminal changed and connected to one of the third input terminals according to a second switching control signal and for selecting a single output; third switching means having fourth input terminals each connected to the first output terminals of the first switching means, and a third output terminal changed and connected to one of the fourth input terminals according to a third switching control signal and for selecting a single output; a microcomputer for supplying the first to third switching control signals to the first to third switching means according to the broadcasting state recognition signals supplied from the NICAM decoder and D/A converter, and outputting the tuning signal and the first to third switching control signals according to the viewer's selected signal at a key matrix circuit coupled to the micro computer; and output means connected to the second output terminal and the third output terminal respectively, and for outputting an audio L-channel signal and an audio R-channel signal respectively.