Superheterodyne radio receiver system - adds binary coded received signal to binary coded IF signal to avoid need for mixing
摘要
<p>The superheterodyne receiver has digital circuits to initiate oscillation in the RF oscillator system. The received signal is binary coded and added to or subtracted from a binary coded signal representing the IF frequency. The oscillator frequency is obtained from this sum by decoding. In the case of subtraction the binary IF code is converted into its own binary coded decimal complement for adding to the coded received signal. The advantage lies in not needing the mix the signals and thereby avoids the disadvantages of such a process.</p>
