®
PMD-100
PMD-100 Process Decoder
General Description
SPECIAL FEATURES
The PMD-100 HDCD® Process Decoder is a sophisticated
0.6 micron CMOS Integrated Circuit that performs pre-
cise decoding of HDCD encoded recordings. The Decoder
also functions as a state-of-the-art digital filter when fed
data from non-HDCD recordings. It is designed to inter-
face directly with popular data receivers and DAC’s, elimi-
nates the need for conventional monolithic digital filters.
The PMD-100 has been carefully designed to maximize per-
formance and ease of use in a wide variety of applications.
Automatic HDCD Process Decoding
When the PMD-100 detects HDCD® process infor-
mation in the input data, it automatically switches to
HDCD® decode mode, and provides an output to drive
an LED indicator. When non-HDCD® process input
data is received, the decoder automatically operates
as a high performance digital filter.
Excellent Filter Characteristics
HDCDProcessInformation
When operating as a digital filter, the PMD-100 ex-
hibits passband characteristics that have been care-
fully optimized to provide extremely accurate sound
quality. Passband ripple from 0 to 20 kHz is within
±.0001 dB and stopband attenuation is greater than
120 dB.
Data encoded with HDCD process information carries pre-
cisely encrypted signals, hidden within the LSB of the 16-
bit data word. Over time, only 1 to 5% of the LSB is used
for this hidden code. The encoded information is inau-
dible and causes no perceptible loss of information. The
PMD-100 recognizes the encrypted signals as HDCD pro-
cess information, and directs the decoding function to pre-
cisely reconstruct the high resolution signal in a form ap-
propriate for output to the D-A converter being used.
Two Operating Modes
Stand-Alone
In Stand-Alone Mode, the PMD-100 requires no
Note: To preserve HDCD process information, no alteration
of the encoded data is allowed prior to processing by the PMD-
100. Digital data processing including phase inversion prior to
the PMD-100 input will result in the loss of HDCD process
information encoded in the data.
external controller, allowing for the most cost
effective designs.
Program
In Program mode, an external processor controls
the PMD-100’s many advanced operating modes
and features.
HDCD
HDCD® and High Definition Compatible Digital®
are registered trademarks of Pacific Microsonics, Inc
9300-0005
Rev A1
Pacific Microsonics, Inc.
32990 Alvarado Niles Road, Suite 910
Union City, CA 94587
1
Phone (510) 475-8000
Fax (510) 475-8005
ETC [ ETC ]
