DIGITAL RADIO DECODING CIRCUIT

摘要

PURPOSE:To eliminate the need for offset countermeasure by utilizing a 2-bit integration circuit so as to use a value at the 1st bit as a discrimination belt. CONSTITUTION:An integration circuit 12 applies 2-bit integration to a detection waveform through a low pass filter 11. A signal is given to a sample-and-hold circuit 14 at the point of time of 1-bit integration in the process to hold the level at that time. A comparator 18 as a discrimination circuit discriminates whether the level at 2-bit integration is upper or lower than the hold value and outputs '1' or '0' as a result. Since the level at 2-bit integration is discriminated by the level at 1-bit integration, no discrimination level generator is required and the discrimination level is added automatically.