US 5,337,196 AGranted

Stereo/multivoice recording and reproducing video tape recorder including a decoder developing a switch control signal

AssigneeSamsung Electronics Co., Ltd.

InventorSang-uk Kim

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Abstract

A stereo/multivoice recording and reproducing apparatus used for a high fidelity video tape recorder comprises a multi-channel television system (MTS) decoder for demodulating stereo and multivoice signals included in an IF signal supplied from a tuner, a high fidelity audio processor for frequency-modulating the stereo signal output from a MTS decoder, left and right channel heads for recording the stereo signal frequency-modulated in the high fidelity audio processor, a second audio processor for amplifying the multivoice signal from the MTS decoder, and a third audio head for recording the multivoice signal amplified in the second audio processor. According to one aspect of the invention, the apparatus can simultaneously record stereo and multivoice signal and selectively reproduce one of the stereo signal and the multivoice signal.

Claims20

Dependent claims

In a high fidelity video tape recorder having a tuner receiving multichannel television system signals including a stereo signal and a multivoice signal, a stereo/multivoice recording apparatus comprising a decoder for simultaneously demodulating said stereo signal and said multivoice signal included in a demodulated signal supplied from said tuner, wherein said decoder comprises:

a first filter for filtering a video frequency component including luminance and chrominance signals from an input demodulated signal;
a second filter for filtering a first frequency component including a stereo main signal, a stereo subsignal, a pilot signal and a second audio program signal from said input demodulated signal;
a first detector for extracting a second frequency component including the stereo main signal from the first frequency component output by said second filter;
a de-emphasis/phase comparator for demodulating the stereo main signal from the second frequency component output by said first detector to produce a demodulated stereo main signal;
a second detector for extracting a third frequency component including the stereo subsignal from the first frequency component output by said second filter;
an amplitude demodulator controlled in response to an initial pilot signal output by a pilot discriminator for demodulating the stereo subsignal from the third frequency component output by said second detector to produce a demodulated stereo subsignal;
a first noise reduction decoder for removing noise from the demodulated stereo subsignal output by said amplitude demodulator;
a matrix circuit for receiving the demodulated stereo subsignal output by said de-emphasis/phase comparator and said first noise reduction decoder so as to generate left and right channel stereo signals;
a second audio program detector for extracting a fourth frequency component including a second audio program signal from the first frequency output by said second filter;
a frequency demodulator for demodulating said second audio program signal output by said second audio program detector to produce a multivoice signal;
and
a second noise reduction decoder for removing noise from the multivoice signal output by said frequency demodulator.

9 more elements

In a high fidelity video tape recorder having a tuner receiving multichannel television system signals including a stereo signal and a multivoice signal, a stereo/multivoice recording apparatus comprising a decoder for simultaneously demodulating said stereo signal, a pilot signal and said multivoice signal included in a demodulated signal supplied from said tuner, wherein said decoder comprises:

a first filter for filtering a video frequency component including luminance and chrominance signals from an input demodulated signal;
a second filter for filtering a first frequency component including a stereo main signal, a stereo subsignal, a pilot signal and a second audio program signal from said input demodulated signal;
a first detector for extracting a second frequency component including the stereo main signal from the first frequency component output by said second filter;
a de-emphasis/phase comparator for demodulating the stereo main signal from the second frequency component output by said first detector produce a demodulated stereo main signal;
a second detector for extracting a third frequency component including the stereo subsignal from the first frequency component output by said second filter;
an amplitude demodulator controlled in response to an initial pilot signal output by a pilot discriminator for demodulating the stereo subsignal from the third frequency component output by said second detector to produce a demodulated stereo subsignal;
a first noise reduction decoder for removing noise from the demodulated stereo subsignal output by said amplitude demodulator;
a matrix circuit for receiving the demodulated stereo subsignal output by said de-emphasis/phase comparator and said first noise reduction decoder so as to generate left and right channel stereo signals;
a second audio program detector for extracting a fourth frequency component including a second audio program signal from the first frequency component output by said second filter;
a frequency demodulator for demodulating said second audio program signal output by said second audio program detector to produce a multivoice signal;
and
a second noise reduction decoder for removing noise from the multivoice signal output by said frequency demodulator.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/829,104Filed 31 Jan 1992
Priority: KR 91-189231 Jan 1991
Granted: 9 Aug 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H04H 20/88
Arrangements characterised by the broadcast information itself: stereophonic broadcast systems
G11B 20/00992
Signal processing not specific to the method of recording or reproducing; Circuits therefor: circuits for stereophonic or quadraphonic recording…
G11B 20/06
Analogue recording or reproducing: angle-modulation recording or reproducing
H04N 5/607
For the sound signals: for more than one sound signal, e.g. stereo, multilanguages