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Lectrosonics R400a Digital Hybrid Wireless Diversity Receiver (Block 19)

Lectrosonics R400a Digital Hybrid Wireless Diversity Receiver (Block 19)

The R400a is a high performance, triple-conversion, frequency synthesized, UHF receiver fully compatible with all Lectrosonics 400 series transmitters, and a number of analog models. The proprietary audio processing includes a DSP (digital signal processor) for very low distortion and a superior signal to noise ratio. The DSP eliminates a compandor and its artifacts to provide exceptional audio quality when operating in its native hybrid mode. Special DSP algorithms also provide compatibility modes for use with Lectrosonics 100 and 200 Series analog transmitters.

The R400a features a powerful menu-driven LCD graphic display operated with a push-button switch and a dual function rotary encoder control as a convenient means of viewing and altering settings. The LCD main window displays the pilot tone indicator, diversity antenna activity, RF and audio levels, operating frequency, transmitter frequency switch settings and transmitter battery status. Settings can be changed using the MENU functions. A built-in RF spectrum analyzer is included to conduct site surveys to find interference-free operating frequencies. The analyzer quickly tunes the receiver across its 256 frequencies and records a marker on the LCD indicating the strength of any RF signals picked up. Within less than a minute, a complete display is generated showing the RF activity across the entire tuning range of the receiver. An area with little or no RF activity is then easy to locate and select.

Features:

  • Digital Hybrid Wireless® (U.S. Patent #7,225,135)
  • SmartSquelch™
  • SmartDiversity™
  • SmartTune™ for auto frequency selection
  • 256 selectable UHF frequencies
  • RF-controlled digital noise filters
  • Low noise, Robust RF Front End
  • DSP-based pilot tone
  • Graphics type backlit LCD display
  • Independent balanced XLR and unbalanced 1/4-inch audio outputs
  • Compatiblity modes for use with analog transmitters

SmartTune™
A major problem facing wireless microphone users is finding clear operating frequencies, especially in RF saturated environments. SmartTune™ effectively overcomes this problem by automatically scanning all the frequencies available in the receiver’s frequency block and tuning the receiver to the frequency with the lowest RF interference, significantly reducing setup time.

SmartDiversity™
Microprocessor controlled antenna phase combining keeps the receiver small, yet still able to deal effectively with multipath dropouts. SmartDiversity™ analyzes both the incoming RF level and the RF level’s rate of change to determine the optimum timing for phase switching, and the optimum antenna phase. This adaptive technique operates over a wide range of RF levels to anticipate dropouts before they occur. The system also employs “opportunistic switching” to analyze and then latch the phase in the best position during brief squelch activity.

Compatibility Modes
The R400A receiver was designed to operate with Lectrosonics 400 Series transmitters and will yield the best performance when doing so. However, the flexibility of digital signal processing allows the unit to able to operate with Lectrosonics 200 Series, 100 Series and certain non-Lectrosonics transmitters in special compatibility modes.

SmartNR™
In order to increase the effective dynamic range of the system, the R400A is equipped with a Smart Noise Reduction algorithm, which removes hiss without sacrificing high frequency response. SmartNR™ works by attenuating only those portions of the audio signal that fit a statistical profile for randomness or “electronic hiss.” Desired high frequency signals having some coherence such as speech sibilance and tones are not affected.

Supersonic Noise-Based Dynamic Filter and Squelch Control
In addition to SmartNR, all hybrid receivers are equipped with a supersonic noise-based dynamic filter and squelch system. The incoming audio is monitored for energy above 22 kHz, pilot tone excepted. Excessive high frequency energy indicates that the received signal is too weak to achieve an acceptable signal-to-noise ratio. Under marginal conditions, a variable low pass filter is rolled in dynamically, masking the noise while preserving as much of the transmitted signal as possible. When the channel is too noisy even for the filter, the audio is squelched.

There is no better way to track the signal-to-noise ratio than to measure it directly, and this noise-based system requires no calibration.

Digital Hybrid Wireless®
Digital Hybrid Wireless® is a revolutionary design that combines digital audio with an analog FM radio link to provide both outstanding audio quality and exemplary, noise-free RF performance.

Using a patented algorithm to encode 24-bit digital audio information in the transmitter into an analog format, the encoded signal is then transmitted over an analog FM wireless link.

At the receiver, the signal is then decoded to restore the original digital audio. This process eliminates compandor artifacts and produces an audio frequency response flat to 20 kHz (US Patent 7,225,135).