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Digital Modulator and Demodulator (QPSK)
Sony has developed a new digital modulator and demodulator that allows large-scale simultaneous multi-
channel operations.
In addition to benefiting from advanced RF technology know-how in the field of analog wireless transmission
systems, the digital audio wireless transmission system also incorporates a digital modulation system that is
less vulnerable to wave interference. These technologies allow highly stable wireless transmission even for a
large number of simultaneous multi-channel operations. The newly developed Sony digital modulator and
demodulator enables up to 12 channels of simultaneous multi-channel operation in a bandwidth of just 6
MHz. Using a unique algorithm optimized for wireless microphone applications, the digital modulator and
demodulator are small enough to be integrated into an FPGA for portable devices.
Transmitter
24 bit
@48-kHz fs
AF
A/D
1152 kb/s
Receiver
De-modulated
Data
Digital
RF
De-modulator
Digital modulator on the one-chip IC
DATA
Digital modulator on the one-chip IC
RF
Demodulator
CODEC
Audio Data
Down Sampling
Channel Coding
&
192 kb/s
Bit Compression
Decripted
Audio Data
Channel Decoding
Filter
Mapping
Filter
I
Detector
Q
Encrypted
&
Digital
Modulator
Packetized
Data
CODEC
24 bit
Up Sampling
@48-kHz fs
&
1152 kb/s
Bit Expansion
Modulated signal
I
Q
QPSK modulation
DATA
WiDIF-HP Technology
RF
D/A
AF
9
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