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Technology
Key Features of WiDIF-HP
This section describes the advantages of WiDIF-HP technology.
High-Quality Sound Transmission on a Par With Wired Microphones
High sound quality is the most important aspect for a wireless transmission. This is achieved through wide
dynamic range, flat frequency response, and excellent transient response performance, factors that are
essential for high-performance broadcasting and PA systems.
Analog systems make use of companders to provide the required dynamic range. However, while compander
systems have improved over time, their inherent problems with regard to sound quality and transient response
performance have not been completely solved.
WiDIF-HP technology was developed by Sony to fundamentally improve the transient response performance
and therefore further enhance sound quality. It employs 24-bit/48-kHz sampling and provides:
Wide dynamic range of more than 106 dB
Wide frequency response of 20 Hz to 22 kHz
Superb transient response performance
Low latency audio transmission
The second key aspect of the WiDIF-HP codec is low latency. In a digital device, signal delays can often occur
due to the sampling, synchronization and calculation process. In particular, when wireless microphones are
used for vocals or speech applications, keeping this delay short is crucial.
In a commonly used codec such as the MPEG AAC, more than 20 milliseconds are required just for decoding.
The high processing speed of WiDIF-HP provides a fundamental solution to this problem and further enhances
sound quality by realizing a total delay of only 3.4 milliseconds* over the entire path from A/D converter in the
transmitter to D/A converter in the receiver.
High-speed response approaching linear systems
Low latency of only 3.4 milliseconds* in send/receive path
* This is the combined latency of the Digital Wireless Microphone DWM-01, Digital Wireless Transmitter DWT-B01, and Digital Wireless
Receiver DWR-R01D.
When analog output is combined with the Digital Wireless Receiver DWR-S01D, the latency rating is 3.6 milliseconds.
10
Key Features of WiDIF-HP
Frequency Response
Frequency [kHz]
Low latency
Total latency (A/D to D/A): 3.4 msec.*
Converted to spatial distance:
Dynamic Response
Analog Wireless System
1.2
m
Digital Wireless System
(WiDIF-HP)
Note
When digital mixers or similar
equipment are used along with the
digital wireless system, their latency
values will be added. It is therefore
necessary to consider the overall
latency of the system.
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