pitfalls to avoid when broadcasting a live audio event
TRANSCRIPT
Presentation Title
Pitfalls to Avoid When Broadcasting a Live Audio Event
Presented by: Mike Smith @sacsmittyDirector of Solutions EngineeringMirror Image
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Whats Your SourceBalanced versus UnbalancedExternal Audio InterfaceAdapters and Cables
Be Prepared!!!
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What To AvoidUnbalanced AudioIncorrect AdaptersOverdriveInput Clipping
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Recommended Input SourceBalanced Audio @ +4dBBalanced TRS Cables or XLRExternal Audio InterfaceBalanced versus UnbalancedAdapters and CablesGarbage In = Out
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A Word About Video and AudioThe quality of the video rapidly deteriorates if the sound quality is poor. Camera microphones are not good enough because they collect the sound from the whole room, creating too much noise that is hard to filter out.
Our ears can filter that noise out, but microphones can not.You can text questions to me at any time during the presentation+1-916-773-1999
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Why Is Audio ImportantListenerfatigue(also known aslistening fatigue) is a phenomenon that occurs after prolonged exposure to an auditory stimulus. Symptoms include tiredness, discomfort, pain, and loss of sensitivity.
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Introduction of ArtifactsMusicality, especially on the radio, contains musical aspects and artifacts that arise from non-musical aspects (dynamic range compression and sonic balance). The introduction of these sonic artifacts affects the balance between these musical and non-musical aspects.
When the volume of music is higher, these artifacts become more apparent, and because they are uncomfortable for the ear, cause listeners to "tune out" and lose focus or become tired.
These listeners may then unconsciously avoid that type of music, or the radio station they may have heard it on.
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Using A DSPA Digital Signal Processor (DSP) is used for gain control, dynamics processing and sound equalization..
RAW Audio
Compression Sample 1
Compression Sample 2
Encoded Sample 32Kbps
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A Word About BalanceToo much signal processing...Causes Listener FatigueDegrades Encoded Audio Quality
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Codecs and BitratesKnow your target audienceDevice and App CompatibilityDont confuse transport stream and codec Cost of bandwidth versus codec used and bitrate
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The Dreaded B Word
BandwidthKnow your bandwidthShared or Dedicated?Wired or Wireless?DSL, Cable or Fiber?WhyEven though audio is relatively low bandwidth, you may need to encode multiple versions from your source encoder.Do you have enough upstream to deliver to your CDN?
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Reaching Your Target Audience
No one content aggregator is alike.iHeart Media (Icecast/MP3 and HLS)TuneIn (RTMP and Icecast/MP3)iTunes Radio Directory (Icecast)
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Questions? Write to:[email protected]
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