Title :
A stereo asynchronous digital sample-rate converter for digital audio
Author :
Adams, Robert ; Kwan, Tom
Author_Institution :
Analog Devices Inc., Wilmington, MA, USA
fDate :
4/1/1994 12:00:00 AM
Abstract :
The design of an asynchronous digital sample-rate converter for digital-audio applications is presented. The theory of asynchronous sample-rate conversion is discussed using a signal-processing model that is based on highly interpolated input samples. A novel closed-loop address-tracking system is disclosed that solves the problem of clock-edge arrival estimation while at the same time providing a low-jitter selection of the correct polyphase filter for each output sample. Sample-rate ratio changes of up to 2:1 in either direction can be accommodated. The proposed signal-processing algorithm has been implemented in a 0.8-μm CMOS technology. Measurement results show excellent agreement with theory
Keywords :
CMOS integrated circuits; Hi-Fi equipment; VLSI; audio signals; audio systems; convertors; data conversion; digital signal processing chips; 0.8 micron; CMOS technology; clock-edge arrival estimation; closed-loop address-tracking system; digital audio; digital sample-rate converter; interpolated input samples; low-jitter selection; polyphase filter; signal-processing algorithm; signal-processing model; stereo asynchronous digital converter; CMOS technology; Clocks; Digital systems; Filters; Frequency; Phase locked loops; Semiconductor device measurement; Signal processing; Signal sampling; Time measurement;
Journal_Title :
Solid-State Circuits, IEEE Journal of
