| 摘要 |
<p>PURPOSE:To extend a frequency error range to be traced by controlling accurately a phase of sampling at A/D conversion with respect to the timing recovery circuit for a digital transmission reception circuit. CONSTITUTION:In a digital reception circuit comprising an A/D converter 1 sampling a received signal and converting the sampled signal into a digital signal, an impulse response estimate section 3 estimating an impulse response of the digital signal to output a pre-cursor as timing information, and a timing recovery circuit 4 generating sampling phase control information to the A/D converter 1 depending on the timing information, the timing recovery circuit 4 is made up of a loop filter 37 eliminating a high frequency component of the impulse response estimate section 3, an accumulator 40 accumulating outputs of the loop filter 37, and a comparator section 41 identifying the accumulated value of the accumulator 40 with a prescribed threshold level to output sampling phase control information and subtracting the accumulated value by the accumulator 40 by the threshold level.</p> |
