Line 6 XD-V BELTPACKS Technology Manual
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Line 6 XD-V BELTPACKS, www.line6.com © 2010 Line 6, Inc. Version 1.3 All rights reserved Reproduction in whole or part without written permission is prohibited Electronic version available at http://line6.com/xd-v.
Line 6 XD-V BELTPACKS, What’s Inside Introduction ....................................................................................................................................................... 4 The Basics ......................................................................................................................................................... 5 What is RF? ................................................................................................................................................... 5 RF Transmission ...........................................................................................................
Line 6 XD-V BELTPACKS, Line 6, Inc. | Wireless Microphone Technology Guide 4 Introduction Wireless microphones provide singers, performers, and presenters with the freedom of mobility unconstrained by cables. But this benefit has historically been provided at the cost of compromised audio quality, radio interference artifacts, and setup complexity. For over fifty years analog FM radio technology has been the dominant approach utilized for wireless microphones, but now digital wireless promises to usher in an era of uncompromised, problem-free performance. This paper’s goal is to provide a technical background
Line 6 XD-V BELTPACKS, Line 6, Inc. | Wireless Microphone Technology Guide 5 The Basics What is RF? RF is an abbreviation for “Radio Frequency” and is used to describe the range of spectrum utilized for many types off wireless transmissions, including radio, television, mobile phones, remote controls, and wireless microphones. The term “Radio” in its most basic definition is the transmission of electromagnetic waves through space. These electromagnetic waves can vary in length and amplitude and occur naturally all around us. The wavelength is the physical distance between the start of one cycle and the start off the next cycle as the wave moves through space. The rate of the wave
UHF analog wireless microphones typically operate in the broadcast TV range designated as channels 14 through 51 (in the USA). Many devices also exist that operate in the band that previously occupied TV channels 52 through 69 (also known as the “700MHz band”), but as of 2009 these frequencies were auctioned for commercial use and public safety, and can no longer be u
Line 6 XD-V BELTPACKS, Until now, the FCC has always required a license to use wireless microphones within any of the UHF TV channels, as described in Part 74 Subpart H of Title 47 of the Code of Federal Regulations. For the time being the FCC is allowing wireless microphones to be used without a license under part 15 rules that restrict power levels and require them not to interfere with licensed users as well as accept interference from those licensed users of the band. The rules are expected to be revised after June 2010. Beginning in 2010, new TV Band D
When a digital signal has noise or interference up to a certain level, the data can still be properly interpreted as ones and zeroes without any alteration in the audio, as shown in the next diagram: The low and high signals (zeroes and ones) can still be read without any audible artifacts. Significant radio interference can impact a digital
Line 6 XD-V BELTPACKS, clear channel while ensuring that the only audio that will ever be passed through the receiver is the intended audio from the transmitter. Choosing a Channel In many analog wireless systems, each uniquely selectable frequency is called a “channel”. This terminology can be misleading, since most of these channels typically cannot be used at the same time. Analog wireless frequencies need to be spaced apart, typically by at least 1MHz, in order for them to operate with minimal interference. But select
Line 6 XD-V BELTPACKS, Additionally, the dynamic range of the original audio signal can exceed 100dB. In order to accommodate this, the transmitter usually has a user adjustment for level control. If a singer is clipping the input, then the transmitter’s signal level must be adjusted downward, and the receiver’s level must be proportionally adjusted upward to maintain unity gain. Typical FM transmitters will also include an additional audio processing section called a “limiter”. This function prevents an overload condition of the audio signal which can cause distortion. The limiter
Line 6 XD-V BELTPACKS, resulting in a typical Total Harmonic Distortion specification of 0.03%, an order of magnitude improvement. Frequency Response The frequency response of an analog wireless system is limited at both the low and the high end. On the low end, it is necessary to roll off frequencies that would interfere with the companding circuitry. For example, a frequency of 20Hz is slow enough to cause the gain to change with each cycle of the waveform. Therefore, low frequencies are filtered out. The high frequencies are limited by the constraints of analog FM technology, which typic
Line 6 XD-V BELTPACKS, Make the right choice at line6.com/wireless-microphone Digital wireless is better. And Line 6 XD-V digital wireless microphone systems are exceptional. Each one delivers unmatched wireless performance, simplicity, and sound on every stage around the world – license free. Our 4th-generation digital technology makes sure of it. You can put your faith in ancient analog technology, or you can simply choose digital. XD-V Digital Wireless Systems Over a decade of digital innovation XD-V30 XD-V70XD-V BELTPACKS
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