Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1991-08-26
1994-01-18
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
4551781, 4551822, 4551823, 4551922, 4551923, 455315, 455316, H04B 1000
Patent
active
052806391
ABSTRACT:
A double super-heterodyne tuner provided with an up-converting section and a down-converting section, and including an input filter constituted by single tuning to be supplied with an input signal, an RF amplifier for amplifying the signal passing through the input filter, and an inter-stage tuning circuit constituted by single tuning connected to an output end of the RF amplifier and provided at an input portion of the up-converting section. The input filter and the inter-stage tuning circuit are supplied with a tuning voltage different from that supplied to a first local oscillator so as to alter its filter characteristics for simplification of the circuit construction and improvement of NF (noise factor).
REFERENCES:
patent: 4061981 (1977-12-01), Endres et al.
patent: 4334323 (1982-06-01), Moore
patent: 4379269 (1983-04-01), Ijichi
patent: 4419768 (1983-12-01), Yamashita et al.
patent: 4817195 (1989-03-01), Kubo et al.
patent: 4984296 (1991-01-01), Schotz
"Wide-Band Double Conversion Tuner", Yasukazu Kamei et al., Sanyo Technical Review, vol. 21, No. 2, Jun. 1989, pp. 49-55.
Eisenzopf Reinhard J.
Keough Timothy H.
Matsushita Electric - Industrial Co., Ltd.
LandOfFree
Double super-heterodyne tuner does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Double super-heterodyne tuner, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Double super-heterodyne tuner will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1143122