Advanced Designs
To overcome obstacles such as image response, multiple IF stages are used, and in some cases multiple stages with two IFs of different values are used. For example, the front end might be sensitive to 1–30 MHz, the first half of the radio to 5 MHz, and the last half to 50 kHz. Two frequency converters would be used, and the radio would be a double conversion superheterodyne; a common example is a television receiver where the audio information is obtained from a second stage of intermediate-frequency conversion. Receivers which are tunable over a wide bandwidth (e.g. scanners) may use an intermediate frequency higher than the signal to improve image rejection.
Read more about this topic: Superheterodyne Receiver
Famous quotes containing the words advanced and/or designs:
“I saw my lady weep,
And Sorrow proud to be advanced so
In those fair eyes where all perfections keep.
Her face was full of woe;
But such a woe, believe me, as wins more hearts
Than Mirth can do with her enticing parts.”
—Unknown. I Saw My Lady Weep (l. 1–6)
“I have nothing against the Queen of England. Even in my heart I never resented her for not being Jackie Kennedy. She is, to my mind, a very gallant lady, victimized by whoever it is who designs the tops of her uniforms.”
—Leonard Cohen (b. 1934)