发明名称 |
TERRESTRIAL AND SATELLITE TELEVISION RECEPTION TUNER |
摘要 |
During terrestrial television reception, in general a first conversion into a first intermediate frequency is followed by another conversion into a second intermediate frequency. During satellite television reception, a FM-PLL-demodulator extracts the baseband signal from the satellite signal converted into a first intermediate frequency. For that purpose, two separate tuners are generally used. The object of the invention is to create a common tuner both for terrestrial and satellite television reception with as little circuitry as possible. The second mixing stage (M2) is switched as a mixer for conversion into the second intermediate frequency during terrestrial television reception and is switched as a component of a FM-PLL-demodulator (30) during satellite television reception. The invention is particularly suitable for television receivers and videorecorders which selectively receive the signal of a terrestrial antenna and of a satellite antenna. |
申请公布号 |
WO9429949(A1) |
申请公布日期 |
1994.12.22 |
申请号 |
WO1994EP01676 |
申请日期 |
1994.05.25 |
申请人 |
DEUTSCHE THOMSON-BRANDT GMBH;ARMBRUSTER, VEIT |
发明人 |
ARMBRUSTER, VEIT |
分类号 |
H03D1/22;H03D3/02;H03D3/24;H03D5/00;H03D7/00;H03J1/00;H04N5/44;H04N5/455;H04N7/20 |
主分类号 |
H03D1/22 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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