Multi-band tuner

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

325388, 325437, 325344, H04B 106

Patent

active

041157370

ABSTRACT:
A tuner for receiving signals broadcast on two spaced bands, each divided into several channels, has two fixed bandpass filters, one to pass all of the channels in the lower band between the lowest frequency f.sub.P of the lowest channel and the highest frequency f.sub.S of the highest channel of the lower band, and the other to pass all of the channels in the upper frequency band between the lowest frequency f.sub.T of the lowest channel and the highest frequency f.sub.W in the highest channel of the upper band. The bandwidth of each channel is f.sub.B. The tuner includes an amplifier and a third filter to which signals of either band are supplied by selective operation of a switch. The third filter has a cut-off frequency below the second harmonic of the lowest frequency of the upper band to simplify the avoidance of image interference from second harmonic signals of the band. A tunable local oscillator supplies a heterodyning signal to the mixer to convert any selected channel of the received signal to an intermediate frequency (i.f.) band, and image interference is avoided by setting the local oscillator frequency f.sub.n required to convert channel n to the i.f. at a frequency above that channel such that the lowest frequency f.sub.L of the i.f. band satisfies the following conditions: ##EQU1##

REFERENCES:
patent: 3639840 (1972-02-01), Shekel
patent: 3931578 (1976-01-01), Gittinger
patent: 3942120 (1976-03-01), Ham
patent: 4009441 (1977-02-01), Kumagai et al.
patent: 4045740 (1977-08-01), Baker

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Multi-band 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 Multi-band tuner, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multi-band tuner will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2121740

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.