Specifications

Remote Control and Receiver-Transceiver Specifications and Requirements
for Windows Media Center in Windows Operating Systems
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Remote Control Input and Long-Range Receiver Requirements
(Up to Five Meters)
The following list provides remote control and long-range receiver requirements.
 Support carrier frequencies ranging from 30-60 kilohertz (kHz).
 Return IR waveform envelopes to software for decoding an IR signal by using software. The IR
signal must not be decoded by using hardware except for using the remote control Sleep button
to wake a Windows Media Center PC from a standby state.
 Receive IR data from up to 5 meters at both the center of the receiver and up to 2 meters off
center.
 Have Band Pass Filter (BPF), Automatic Gain Control (AGC), and demodulator inside the IR
receiver.
 Use BPF centered at 36-38 kHz.
 BPF passes optimized for a signal ranging from 30-60 kHz.
 Recommended to be optimized for 950 nanometers (nm) of light.
 Hardware must sample at 50 μsec.
 No noticeable degradation in signal quality from a distance up to 5 meters from the center and
from a distance and that is up to 2 meters off center (in an indoor room with fluorescent lights
without excessive reflection in the room).
 Must be able to sample pulses as short as 216 μsec with 378 μsec space to recover between
pulses at 36 kHz.
 Must be able to accurately receive Windows Media Center RC-6 protocol.
 Must be able to accurately receive Windows Media Center SMK QP protocol
 Must be able to accurately receive Microsoft Media Center IR Keyboard input.
 The receiver must operate in the 33-50% duty range because most IR signals operate in this
range.
 The receiver may introduce up to a roughly 200-250 μsec error when measuring a 600 μsec
pulse or space.
IR Learning Requirements (from Five Centimeters or Less)
The following list provides IR learning requirements.
 Support carrier frequencies ranging from 30-60 kHz.
 Be able to capture a raw IR data stream.
 Be able to capture an IR carrier frequency.
 Be able to respond to the IOCTL to flash the receiver‘s LED.
Transmitting IR Data (Emitting) Requirements
The following list provides IR data (emitting) requirements.
 Support carrier frequencies ranging from 30-60 kHz.