By Imagination Technologies

Going wireless
It’s a trend accident everywhere today – accessories are activity wireless and abutting to the internet. And not aloof the all-over smartphones, tablets and the acute TV either, add to this a growing annual of customer electronics products: refrigerators, ovens, amateur consoles, axial heating systems, acclimate stations, radios and home stereo systems.
Indeed the simple home stereo is disturbing in the agenda world. Little atramentous boxes bristling with audio outputs are proliferating throughout the home, alien controls ataxia the active allowance table, advancing stations ataxia the bedrooms, kitchen and study. Countless inputs and ascendancy methods, adverse interfaces, and way too abounding affairs accept created a home ball headache.
Fortunately the bearings is improving. Modern stereo systems generally appear able with connectivity – Ethernet, Bluetooth or Wi-Fi, enabling them to admission your favourite online music alive casework or comedy agreeable from your smartphone, PC or NAS drive. And now that wireless connectivity is acceptable added popular, the abutting analytic footfall is to absorb wireless technology into the speakers themselves, creating an untethered audio acquaintance to be enjoyed anywhere aural the home. In about-face these can body into absurd multiroom systems enabling the music to chase the adviser wherever they adeptness be. Unfortunately this is area abounding abatement short.
Of course, the abstraction of wireless audio isn’t new. We enjoyed home theatres and TVs with wireless alternation rear beleaguer speakers over a decade ago, and today there are several agenda solutions available. Some use the absolute home mains base to annihilate accidental connections, others actualize clandestine cobweb networks to acquaint amid devices, abounding are now appliance Wi-Fi.
Many high-end stereo systems action a ‘party mode’ area several accessories are affiliated calm to comedy the aforementioned audio beck to actualize a multiroom experience. However sometimes the arrangement is unreliable, conceivably the ecology altitude are unfavourable, or the area of the transmitter is unsuitable. Networked audio accessories await aloft a adept alarm to accumulate them all synchronised, if that alarm arresting is absent or delayed due to poor bandwidth or alternate arrangement communications again ‘party mode’ bound becomes a abstruse cacophony of sound.
Figure 1: Archetype multiroom audio configuration, with players and speakers affiliated wirelessly
The botheration of synchronicity
One of the capital difficulties in synchronising streams over TCP/IP networks is that they apply ‘best effort’ methods to bear IP packets – there’s no agreement of commitment and packets admission randomly, admitting aural a analytic predicable timeframe. Alike appliance timestamped multicast streams, audience will alluvion out of synchronisation and charge to be periodically corrected.
In the case of acoustic beck delivery, the inherent cessation aural the arrangement is generally too ample and capricious to anxiously synchronise streams amid several applicant devices. Whilst it’s authentic that software timestamping protocols active over TCP/IP can accommodate some amount of synchronicity amid pairs of devices, these methods accept to agency in arrangement cessation and round-trip packet times and are accordingly not finegrained abundant for audio, abnormally aback advancement the break amid larboard and appropriate stereo audio channels or recreating absolute 5.1 beleaguer sound.
Why synchronisation matters

Humans accept acquired a awful authentic acumen of complete spatial location, created by the academician analysing the minute variances in credible amplitude and interaural time aberration amid complete sources. This occurs because the complete charge biking hardly altered distances to anniversary ear. Studies accept apparent that fractions of milliseconds amid complete after-effects accession via larboard and appropriate audition pathways are acceptable for bodies to accurately actuate the administration of an audio source. In actuality the animal audition arrangement is so acutely acute that it is accessible for us to analyze sounds from two altered locations area the bend amid sources is as little as three degrees.
The blueprint in Figure 2 illustrates how interaural time aberration corresponds to angular direction. For example, a complete delayed by 0.64mS amid anniversary ear is perceived as advancing from 90° anon larboard or appropriate of the listener. Smaller delays accord to narrower angles: a time adjournment of about 25μs yields the 3° aberration in bend mentioned above.
Simple trigonometry and basal physics allows us to acquire a archetypal to prove the theory, and from this it can be affected that delays in the adjustment of microseconds are cogent abundant to abet a acumen of several degrees about-face in complete location. And it’s these attenuate nuances that are alien into an audio recording to charm the aftereffect of stereo and beleaguer sound.
For articles such as wireless speakers, a actual bound synchronisation charge be maintained amid anniversary accessory in adjustment to anxiously carbon the dynamics of the audio environment.
Figure 2: How interaural adjournment corresponds to spatial area of complete sources
So how does Imagination’s Caskeid IP differ?
Whereas aggressive solutions await on proprietary technologies or software timing methods, Caskeid is altered in that it exploits timing signals built-in to the absolute Wi-Fi basement in adjustment to agreement accessories are synchronised. The adorableness of this admission agency that Caskeid is allowed from cessation aural the network. It additionally minimises alarm drift, which would contrarily bear beyond clients.
Figure 3 archive the aberration of a stereo audio antecedent amid speakers over time, abstinent in milliseconds. Zero aberration shows audio is altogether synchronised, and any aberration (plus or minus) from the centreline agency the stereo angel is biased appear either the larboard or appropriate speaker.
The blooming band illustrates Caskeid’s achievement in advancement synchronisation amid Wi-Fi affiliated stereo speakers. Caskeid is able of guaranteeing a aberration of alone 20μs amid speakers with actually no alluvion and accordingly no resultant about-face in stereo image.
Figure 4 compares the after-effects acquired from Caskeid with three arch aggressive technologies for wireless multiroom and stereo audio systems.
Competitor A illustrates the problems associated with poor synchronisation: the abstinent best aberration of 1.8ms (=1,800μs) accompanying with the aerial amount of change amid larboard and appropriate channels agency that stereo reproduction is impossible. The adviser will acquaintance the complete acreage affective amid speakers.

Figure 3: Caskeid synchronisation beyond Wi-Fi affiliated stereo speakers, bound at 20μs best deviation
Competitor B’s band-aid attempts to advance a affiliated synchronisation annual amid speakers, which lessens the acumen of the stereo angel brief beyond the complete stage. However during tests this technology bare an boilerplate of 25 annual to assemble in adjustment to actualize a absolutely synchronised stereo pair. Contrast this with Caskeid’s adeptness to lock synchronisation amid accessories anon and advance ancillary operation indefinitely.
And finally, Competitor C provided the abutting after-effects to Caskeid. During our testing the technology apparent 160μs aberration amid speakers but appropriate an boilerplate of 20 annual to accomplish optimum synchronisation. Again analyze this with Caskeid which, beneath identical conditions, is eight times added authentic in synchronisation from the outset. Overall the aggressive technology exhibits apathetic synchronisation and ample alluvion amid accessories consistent in a alive stereo image.
Caskeid is authentic to accept class-leading achievement with affirmed microsecond accurateness of synchronisation beyond all wireless speakers to bear an authentic and changeless stereo image, and affectionate reproduction of the soundstage.
A absolute apple implementation
It all sounds like acceptable admission but how about a absolute apple example? Fortunately Imagination doesn’t aloof authorization the IP, we additionally body articles to prove the concepts and added clarify the technology.
Imagination’s customer electronics division, Pure, use Caskeid IP in their Jongo wireless apostle systems and internet-connected radios. Here’s how it works…
Figure 4: Caskeid against three arch aggressive technology solutions for synchronisation
All Jongo-enabled articles are affiliated via Wi-Fi. Caskeid patented technology anon synchronises all radios and speakers associated with the admission point. One accessory is adopted as master, this acts as both a media server (DMS) and renderer (DMR) and becomes amenable for both accepting and ‘broadcasting’ the stream, which can be stored locally or be sourced from a cloud-based music service. A smartphone, book or alike a affiliated (Wi-Fi enabled) radio acts as the ascendancy point (DMC). The added accessories become audience and act as media renderers alone (DMRs). The adept sets its alarm from the admission point, compensates for arrangement cessation by artful a approaching timestamp accumulation acceptable adjournment to acquiesce the audio beck time to admission at the applicant accessories over accepted TCP/IP protocols, again stamps the audio beck with the affected ‘trigger’ timestamp. The audience absorber the audio beck accession from the media server, and use the timestamp advertisement from the admission point as the adjustment apparatus to agreement microsecond accurateness of synchronisation beyond all devices. The aftereffect is altogether synchronised audio.
Caskeid-enabled articles are authentic to crop microsecond attention amid devices, able of altogether breeding left/right stereo approach break and timing, or absolutely replicating 5.1 and 7.1 beleaguer complete systems wirelessly appliance accepted Wi-Fi admission points. They accomplish this because Imagination’s Ensigma communications IP abnormally maintains advantaged admission to the altered arrangement layers, affording the accomplished amount of ascendancy all-important to sustain absolute synchronicity.

Add to this Imagination’s FlowCloud belvedere technology for cloud-based casework and accessory administration and you accept a absolutely featured, end-to-end band-aid for connected, synchronous, wireless audio.
Figure 5: Jongo multiroom audio products, appliance Caskeid for absolute synchronisation
There’s an app for that…
Imagination additionally food the software framework and casework all-important to body applications to ascendancy multiroom audio. Examples abide for both Android and iOS devices, appliance Imagination’s FlowCloud APIs to admission cloud-based music casework and ascendancy wireless speakers and radios that anatomy the multiroom audio solution.
The appliance provides a abounding internet radio service, alleged FlowRadio, with burning admission to over 20,000 stations worldwide, in accession to ‘listen again’ casework and about 270,000 podcast episodes online. To accompaniment internet radio, FlowMusic technology provides subscribers with a abounding alive music annual and offers the adeptness to acquirement music advance anon from any FlowCloud-enabled audio device. The agreeable can be articular appliance audio fingerprinting technology and a distinct button columnist acclimated to affirm the purchase. Advance are fabricated accessible online for download through a agreeable aperture and again may again be played on any accordant audio device.
The absolute package, including the APIs to collaborate with accessories and the backend administration tools, is accessible as a white-label annual to our customers, accouterment a absolute apartment of affiliated audio casework with abounding aback appointment abutment for annual management, aperture hosting and processing of online payments. Overall it’s a absolute accompaniment to Caskeid-powered affiliated audio products.
Figure 6: Pure Connect, an archetype of a cloud-based FlowCloud annual to ascendancy Jongo multiroom audio products
Further information
Want to apperceive more? For added advice on Caskeid, FlowCloud and Ensigma IP, amuse go to our website at www.imgtec.com.
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