VIEWS: 8 PAGES: 3 POSTED ON: 3/11/2012
Limpet Limpet is a signal processing and networked control Two independent channels and monitoring module intended for installation in an active loudspeaker, making an ideal companion for Linea’s High quality 96kHz audio processing MiniPod amplifiers. Processing includes crossover filtering, Separate OEM and User settings equalisation, delay and limiting, in addition to comprehensive monitoring features. Exceptional sonic Temperature monitoring quality is assured by careful selection of critical Driver impedance monitoring components, minimum signal path and expert DSP algorithm design. Limpet’s small dimensions allow it to be Abuse logging tucked away in a restricted space. BvNET networking The number of channels shown in PodWare Introduction / Key Features Branding is determined by the firmware model issued by Linea Research. Primarily targeted at active loudspeakers, Each device is branded for the OEM Limpet is an ideal companion for Linea customer so that PodWare reports the model Research’s analog pod amplifiers, adding name of your choice, with your colour Voices Digital Signal Processing and BvNET scheme etc. networked setup, monitoring and control. Limpet allows four complete sets of parameters to be stored. Each set is Housed in a compact, rugged steel case, Crossover shapes Limpet provides generous amounts of called a Voice. Voices may be used, for Limpet is capable of crossovers up to 8th example, to select an alternative tuning as signal processing capability, with access to order (48dB/Octave). In addition to the a wide variety of crossover shapes. may be required if a speaker is used with usual Butterworth, Linkwitz-Riley and Bessel or without a separate sub-bass unit. Voice filter shapes, Limpet provides access to settings are stored permanently inside A simple user-interface may consist of Hardman crossover filtering, a technique we some essential indicators and a switch Limpet and so will always be available even are proud to have introduced to the industry. arrangement which allows the user to if Limpet is not being used with PodWare. Hardman filters produce much steeper cut- select from a number of Voicings which off slopes for a given order than you provide. The voice selected depends on the conventional crossover alignments, without condition of two ‘switch’ lines. Normally two any additional group delay. This allows a latching switches would be used to A multi-km network of devices may be lower order filter to be used without monitored and controlled by the PodWare determine which voice is selected. If no sacrificing cut-off characteristics, but with connections are made to either of the two Windows application. Protection of your smoother group delay and less severe phase settings is assured in an uncomplicated voice select terminals, voice 1 will always penalties, giving a more natural sound. be activated at power-on. fashion by cleanly separating your OEM Hardman filters also provide identical phase settings from those which the user has characteristics between adjacent bands (like access to. Linkwitz-Riley), so the polar performance is Indicators and Switches rock steady Up to two LED indicators and up to two We also employ phase matching on our Switches may be used on your loudspeaker Bessel filters, so adjacent bands are in-phase and wired into Limpet. The LEDs can be throughout the crossover region. configured to show a range of things such as Signal Presence and Limiter action. The Our white-paper “Crossover Filter Shape switches would normally be used to select Comparisons” provides more detail on this Factory/User Voice and Factory A/Factory B subject. Voice. High-Pass Filtering Temperature Sensing To avoid unnecessary inter-band phase Limpet contains a temperature sensor Sonic Purity shifts common in many competing products, internally, which is always shown on the we provide high-pass filtering on the inputs PodWare panel. Limpet uses 96kHz sampling rate, Burr- Up to two further external temperature rather than forcing you to apply ‘system’ Brown analogue-to-digital converter, the sensors may be attached. Your OEM high-pass filtering on the low crossover renowned Wolfson multi-bit digital-to- settings will determine whether each of bands. analogue converter, and a powerful 3rd these sensors is enabled. If any external generation Sharc Digital signal Processor sensor is enabled, a temperature bargraph Our white-paper “High-Pass Filtering in Two- (DSP) running audio processing algorithms and a temperature log will be displayed for Way Systems” explains why this is borne of years of experience in high that sensor in PodWare. important. quality professional digital audio. All this adds up to deliver the ultimate in sonic transparency and a stunning open natural Configuration Impedance Monitoring sound quality, fully living up to the very Limpet may be configured to provide Up to two external current transformers high sonic standards set in our amplifier processing for up to 2 audio inputs and up to may be attached which can monitor the products. two audio outputs. impedance of the connected driver(s). Limpet www.linea-research.co.uk Page 1 of 3 PodWare is then able to check that the However, the OEM can optionally hide the driver impedance is within the limits input High-Pass filters from the user in Available determined by your OEM settings. situations where these are required by the OEM for integrating the loudspeaker with a Parameter OEM User separate Sub-woofer. PodWare’s MonIcon User settings Input gain The PodWare application uses a small The user cannot access your driver (output) Input High-Pass filter panel called a MonIcon to display all the settings since these are only accessible in Input Low-Pass filter important status OEM mode, which is password protected. information about The user can however apply input 8 band Input Limpet at a glance. processing, which will effectively overlay 2-band Input shelving From this small panel it your OEM settings. is possible to see input Input Delay signal activity, limiter In normal User mode, the full Limpet control Output Gain activity, temperatures, panel in PodWare looks like this: Output High-Pass amplifier protection status, driver impedance Output Low-Pass Filter status and amplifier clip 6 band Output indication, as well as being able to change 2 band Output the gain and mute the loudspeaker. The Output Delay full control panel is only one click away from the MonIcon. You can also update Output Limiter the firmware in the unit via PodWare – Input level meter even via the network. Limiter meters OEM Settings Amplifier protect Abuse Monitoring Temperature meter(s) As the OEM, you have complete freedom Limpet continuously records logs against to edit the crossover, driver equalisation time for all the temperature readings, and Driver imp.indicator(s) and driver delay parameters. You can also the state of amplifier protection for up to 3 Amplifier clip indicator apply a model name for the loudspeaker. days into the past. These may be easily Once a complete tuning has been viewed at any time. The data from them can Abuse logging completed, PodWare allows you to save a even be exported to a spreadsheet for Power cycle count Factory file which contains all these further analysis. parameters. This file can then be used to load settings in production. Obcom Should you wish to change the OEM settings in the field, modified Factory files An all-new, clean messaging system can be distributed and loaded by the user developed by Linea Research, called without disturbing the user-settings, and Obcom is at the heart of our software. without the user being able to access the Obcom is used throughout our application OEM settings. software, and across all communications In OEM mode, the full Limpet control media (such as BvNET). It is a thoroughly panel in PodWare looks like this: uniform standard that allows easy communication between different applications and different devices that support the Obcom standard. Obcom now has a large user base and is supported by many Pro Audio manufacturers. Connections There are eight multi-way connectors on Limpet, suitable for connection to: • The Channel A amplifier (audio output etc). • The Channel B amplifier. • The ‘interface panel’ (audio input A and indicators, switches etc). • The channel B audio Input • External temperature sensor A • External temperature sensor B • External current sensor A • External current sensor B Hiding By having a clean split between OEM and Availability of Features Linea Research can supply ‘standard’ wiring User processing, security is very simple: Depending on whether PodWare is in OEM looms and interface circuit board The user cannot access any of the mode or User mode, the ‘parameters’ which assemblies. We would also be pleased to parameters which are considered to be the may be viewed (and if appropriate, edited) assist with the design of any custom wiring responsibility of the OEM. Only with the are as follows: looms, and would be pleased to offer a OEM password (agreed with Linea quotation to supply such looms or Research) can PodWare be unlocked to completely wired panels gain access to the OEM parameters. Limpet www.linea-research.co.uk Page 2 of 3 with these directives implies conformity Technical Specifications Environmental with the following European standards: Temperature: 0 to +55°C Humidity: 0 to 80% RH • EN55103-1 Electromagnetic Input impedance: 5.5k Ohm unbalanced 11k balanced (non-condensing) Interference (Emission) Dimensions • EN55103-2 Electromagnetic Output Imp: <50R Gnd balanced Susceptibility (Immunity) Height: 24mm Max Input level: +10dBu Width: 83mm Max Output level: +5.5dBu Depth: 138mm It also meets the requirements of part 15B Weight: 300g (EMC). Sample rate: 96kHz Frequency Resp: 20Hz - 20kHz+/-0.5dB This product is intended for operation in 10Hz - 40kHz +/- 1dB Regulatory compliance the E2 (commercial & light industrial) and Dynamic range : 110dB A E3 (urban outdoors) Electromagnetic This product complies with the EMC Directive (20Hz - 20kHz) Environments. (89/336/EEC) as issued by the Commission THD (20Hz–20kHz): <0.01% E&OE of the European Community. Compliance Power consumption: 4W max. Signal Processing Block Diagram Dimensional Drawing Limpet www.linea-research.co.uk Page 3 of 3
"DE1730-01 Limpet Data Sheet"