Detecting circuit, modulation scheme identifying circuit, integrated circuit, tuning device, and common multi-scheme receiving device

摘要

A plurality of detectors are included which have different detection frequencies. The detectors detect the signal level of an IF signal at the respective detection frequencies. The IF signal is produced by frequency conversion of an incoming signal in a mixing section. A comparator identifies the modulation scheme of the incoming signal from a comparison of the signal levels detected by the detectors. Accordingly, a detecting circuit is realized which is contained in a common multi-scheme receiver receiving a plurality of transmission signals with different modulation schemes and which identifies various modulation schemes for incoming signals.