Extremely high Third Order Intercept (IP3) performance of +15 dBm, 24-bit/48 kHz audio perfor- mance, and AES-256 CTR mode encryption ensure that profession- als in all audio disciplines have the tools needed to get the job done, even in extremely tough environments.
Compatibility Modes
The DSR4 receiver was designed to operate with Lectrosonics digital transmitters from the D2, DCH and M2 series. The receiver is also backward compatible with Digital Hybrid Wireless® trans- mitters including those with NA Hybrid, NU Hybrid, JA HYBRID and EU Hybrid modes.
Encryption
The DSR4 receiver features AES 256-bit, CTR mode encryption, with 4 different key policies avail- able.
Diversity Options
The DSR4 offers two diversity options: for 4-channel operation, each channel combines signals from both antennas in or out
of phase, depending on field strength at each antenna and which combination yields the best results. For 2-channel operation, receivers can be paired for Vector Diversity operation. The Vector subsystem smoothly and continuously combines RF signals from both channels, with dif- fering phase angles in order to obtain maximum energy. The four receivers in the DSR4 can be use separately or combined in pairs.
RF Frequency Tracking Front-End
In addition to the extremely high IP3 capability of the receiver, to significantly reduce unwanted interference and intermodulation problems, the DSR4 has a fre- quency selective front-end section that tracks and tunes to the de- sired signal frequency and rejects unwanted interfering signals. The low noise, high current RF ampli- fier was designed with feedback regulation for stability and precise gain in order to handle stronger RF signals without output over- load. This produces a robust front-end that is as selective as fixed single frequency designs and is suitable for use in close proximity to other receivers and transmitters commonly used in field production bag systems.
Smart Noise Reduction (SmartNRTM)
The DSR4 has been meticulously designed using the best avail- able low noise components and techniques. Nonetheless, the wide dynamic range of digital and Hybrid transmission technology, combined with flat response to 20 kHz, makes it possible to hear the -120 dBV noise floor in the transmitter’s mic preamp, or the (usually) greater noise from the lav microphone itself. (To put this in perspective, the noise gener- ated by the recommended 4k bias resistor of many electret lavaliere mics is –119 dBV and the noise level of the microphone’s elec- tronics is much higher.) In order to reduce this noise and thus increase the effective dynamic range of the system, the DSR4 is equipped with a selectable Smart Noise Reduction algorithm, which removes hiss without sacrificing high frequency response.
