| 摘要 |
The subject-matter of the invention is a television receiver circuit used for separating and demodulating audio signals radiated in accordance with different transmitting standards, which circuit comprises an intermediate-frequency filter (1), an audio channel intermediate-frequency demodulator (2) connected thereto, the output signal frequency of which is equal to the difference between the picture carrier frequency (fkk) and audio carrier frequency (Fak), and an audio demodulator (4) following the audio channel intermediate-frequency demodulator (2). Between the audio channel intermediate-frequency demodulator (2) and an audio demodulator (4), a standards module (5) is inserted which contains an harmonic oscillator (10), filters (6) which can be switched on and off by switches (7) and the frequency bands (Fa...Fn) correspond to various transmitting standards and a mixer (11), these components of the standards module (5) being connected in such a manner that the signal passes through the standards module (5) via the filter (6) and the mixer (11) and is mixed with the signal coming from the harmonic oscillator (10) in the mixer (11). The standards module (5) can additionally have a bypass with a switch (SB). <IMAGE>
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