Filter
Top Products
< 21 >
The “sampling theorem” says that, if the sampling frequency is more than twice as high as
the maximum frequency of original signal, then the original signal can be retrieved by A/D
and D/A conversion. With CDs, the sampling frequency is 44.1kHz, meaning the maximum
frequency is band-limited to 22.05kHz. Therefore, the information on the waveform for over-
22.05kHz frequencies is not transmitted.
Unless it’s sinusoidal, a signal contains multiple high-order harmonics. So does a square
wave. If the input is a 1kHz square wave signal, it retains its shape because much of the
information on the waveform for harmonics is retained after the A/D and D/A conversion.
But if the input is a square wave of a high frequency, the converted signal presents
a rounded shape because of the absence of information on high frequencies.
A/D and D/A Conversion in Frequency Domain
CC Converter
CC Converter
Problem: A high-frequency analog signal cannot be accurately recreated by A/D and D/A conversion. (2)
Problem: A high-frequency analog signal cannot be accurately recreated by A/D and D/A conversion. (2)
RX-D702