An Introduction to ZHD Modulation
ERX Software v2.0
All of Zaxcom’s wireless microphone system uses only 100% digital modulation, this results in audio quality superior to any analog or digital hybrid FM wireless system.
Zaxcom transmits its audio as 1s and 0s in a 100% digital form so no companding is needed to alter the audio content; this results in a much higher quality reproduction of the original audio under all circumstances.
Conventional FM wireless systems, including standard companded FM and digital hybrid wireless, use analog FM modulation and contain no digital content. Noise reduction systems, pilot tone squelch, FM distortion and RF interference all contribute to system performance that cannot begin to match that of a pure 100% digital system like Zaxcom’s digital wireless.
The range of Zaxcom’s new digital wireless 2.0 is now equivalent to, or better than, that of any FM radio system.
Digital wireless overview
Zaxcom TRX transmitters and ZFR miniature recorders have the ability to transmit its own audio via its built-in ZaxNet 2.4GHz transmitter. That audio can be monitored by an ERX receiver tuned to the same ZaxNet frequency of the transmitter. The purpose of this is for confidence monitoring. So you can now mic up talent and listen to how the mic sounds without having to return to your cart. The range of the ZaxNet confidence monitoring will not be as far as a normal ZaxNet signal – you can expect a range of about 10 feet.
In the TRX and ERX menu you can set the ZaxNet audio out of the recorder so that there is an audible record beep sent to just the ZaxNet feed, so when start recording and you are monitoring the ZaxNet monitor feed, this allows the user to
insure the TRX/ZFR is in record mode while monitoring the audio on an ERX
ZaxNet confidence monitoring
Intermodulation occurs when the RF from multiple transmitters, in close proximity to each other, mix together in the transmitters amplifier, and combine their outputs. Intermodulation can occur even if you are running just two transmitters on set, or in a sound bag. Intermodulation is undesirable because it creates spurious emission which can greatly interfere with reception and degrade audio reception.
Zaxcom’s fully digital wireless is immune to most intermodulation. This will give you the confidence that you will be getting the cleanest RF signal possible with no need to worry about special channel spacing. And without the typical channel spacing limitations, that are necessary in other wireless systems, the number of useable channels that can safely fit into a frequency block is greatly increased.
When designing the IFB200 we wanted to pack as many useful features as we could into as small of a unit as possible. After lots of tinkering we came out with something that we are very proud of.
As far as the physical unit we made it lightweight, small and we paid special attention to the layout of the 200. The result is something that works well on a sound cart, in a bag, but also mounted on a camera.
Like its predecessor the IFB200 has all the standard ZaxNet transmitter functions plus a whole lot more.
We also added the ability for the IFB200 to act as a ZaxNet receiver.
First and foremost you can control any Zaxcom TRX wireless remotely, so there is no need to approach talent and fumble with the transmitter anymore. If you notice that your selected frequency is now getting hits, just scan the spectrum with the QRX to find a clean one – then with the IFB200 remotely change the frequency. Talent starts yelling mid take? No problem – just remotely lower the gain. The IFB200 also give you the ability to start and stop the TRX’s internal recorder. So when a scene starts you can put the TRX into record mode, when the scene ends you can stop it, and if you like you can put the TRX into playback, so you can listen to the TRX’s recorded audio all while the talent is on set wearing the transmitter. The 200 also enables PowerRoll. PowerRoll allows a TRX transmitter to stay in the lower transmit power setting of 25mW to conserve battery power – then when you begin to record the transmitter will increase its output power automatically.
We also added the ability for the IFB200 to act as a ZaxNet receiver. So now if you put the IFB200 into receive mode it can receive confidence audio from a QRX235 that is mounted on a camera, or you can listen to confidence audio from any TRX transmitter or ZFR miniature recorder. The 200 can now also receive and lock its internal timecode generator from any other ZaxNet transmitter.
The IFB200 will also broadcast audio and timecode over the same ZaxNet 2.4GHz frequency, which allows you to send timecode and audio throughout your set. The IFB200 can take in two channels of either analog or AES audio and send that audio out to the ERXs – you can chose to send either channel or a mix of both to anyone on set with ERX receiver.The same signal also has timecode embed in it, so the IFB200 can also transmit frame accurate timecode, at any selected frame rate, to a camera, timecode slate, or any other device that has a ERX attached to it. The design of the 200 allows it to be easily mounted on a camera. So now the camera can be a master timecode generator – distributing wireless timecode throughout the set via the IFB200. The camera’s audio out can also be sent to anyone wearing an ERX receiver.
But wait there is more. We added a micro SD card slot on the IFB200 – the card slot serves two purposes. First it lets you update the software at home on the unit in just a few seconds with no additional hardware necessary. And secondly it is a high quality two track audio recorded with timecode. Now you will always have an extra recorder with you. 96 hours of two tracks of analog or AES audio can record on a single micro SD card. The tracks are recorded as a .zax file which utilizes our ultra stable robust MARF recording system. The .zax files can then easily and quickly be converted to either a BWF or MP3 file using the free ZaxConvert utility.
Please contact your dealer for any additional information.
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