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:
“Death, that hath sucked the honey of thy breath,
Hath had no power yet upon thy beauty.
Thou art not conquered. Beauty’s ensign yet
Is crimson in thy lips and in thy cheeks,
And death’s pale flag is not advanced there.”
—William Shakespeare (1564–1616)
“I have no designs on society, or nature, or God. I am simply what I am, or I begin to be that. I live in the present. I only remember the past, and anticipate the future. I love to live.”
—Henry David Thoreau (1817–1862)