theibcdaily Saturday 08.09.2012 101
Making the connection
JK Audio By David Fox
The new RemoteMix-One offers the audio mixing capabilities of JK Audio’s BluePack BeltPack interview tool but with a cabled
connection to the mobile
phone instead of using Bluetooth. “This gives the advantage that full-bandwidth audio can be sent to and from
the phone – something not supported in the current Bluetooth standard – making it an ideal audio interface for mobile phone codecs such as the Comrex ARC, Media-5 or Luci-Live,” explained Ian Prowse, director of distributor Vortex Communications. It has mic and aux/tape inputs – both with level
controls and peak indicators – plus headphone and stereo line outputs.
The new RemoteMix-3.5
reporter’s mixer for news and sport with Bluetooth and cabled interfaces has three mic inputs (one mic/line
switchable) and three
headphone outputs with individual level control, plus telephony interfaces, cabled for PSTN and PABX and
Bluetooth for mobile phones. For simpler applications, its BlueSet and BlueDriver and new Interloop Bluetooth audio interfaces provide wire-free connections to mixers and intercom systems. They pair with each other, with mobile phones, Bluetooth headsets or Bluetooth-enabled laptops. 11.G11
HD distribution over IP on demo
Opticomm-Emcore By Heather McLean
Emcore is demonstrating its Opticomm-Emcore NV Series JPEG2000 products. The series sends out 3G HD, HDMI or DVI signals to HD monitors in one or multiple locations, using IP. When the NV Series is combined with a compatible managed Ethernet switch setup, a flexible HD matrix switching distribution system can be created. The NV series allows Emcore customers to move from matrix switch to managed-Ethernet switch by cascading multiple switches, so that numerous displays may be located long distances from their sources while sustaining consistent 1080p video and sound quality.
In addition, the NV series allows USB data to be sent to control a remote keyboard and mouse. The NV encoders and decoders may be configured via API or a web server, and can be mounted in a 1RU rack or used as a standalone unit. 2.A48
By its very nature, MPEG compression is resilient and tolerates a certain degree of signal loss or corruption. Especially critical packets are frequently repeated, the loss of one such packet is not seen as a catastrophic event. So the effect of data corruption is very much dependent upon the specific piece of data that is corrupted. The random nature of atmospheric impairments to microwave links suggests that some faults would be detected, while others would not. A customer asked us how they might monitor the integrity of a complex DVB-ASI signal path. Much of the test equipment used in monitoring and maintaining transport streams focuses on the original construction of the stream. These instruments are superb analysis tools for looking at the performance of encoders and multiplexers. But how well suited are they to the task of fault finding in a signal chain? We began looking at this as a data integrity problem and decided to take a cue from the SDI world and found a way to introduce checksum or CRC
packets into a transport stream. We built a system that calculates a checksum across a group of data packets. By inserting a checksum (or better, a CRC packet) 10 or 20 times per second, we could immediately identify at a downstream point that an error had occurred.
Because it operated independently of the content itself, the analysis does not require any a priori knowledge of the content being
transmitted. In fact, as long as the packet construction adheres to the transport stream specification, this technique works with encrypted or scrambled data.
In addition to testing the checksums at the ultimate destination, it may also be important to break the path into sections that can each be tested independently. To provide this capability, we conceived of a hybrid element in this system, a CRC relay if you will, which calculates the incoming check sum to test the incoming integrity. It calculates a new check sum which is inserted at the output.
David Wood: ‘Techniques to prove data integrity’
In this way the entire history of each link in the path is accumulated as the signal propagates from one point to another.
A benefit in having a channel
error detection with both fine granularity and extremely fast response is that when a data error occurs, you know about it within a tenth of a second. This is much, much faster than the analysis response of traditional MPEG analysers. The response from our CRC test can be used to generate system alarms, or to initiate automatic switching to backup systems for disaster recovery. 8.B91
How well is current test equipment suited to the task of fault-finding in a signal chain? Ensemble Designs’ president David GS Wood looks at the broadcasting issues in detail
Signal path integrity issues Opinion
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