Audio Template Settings, Aac-He | VBrick Systems 7000 manual

		Video/Audio Configuration


	Automatic Volume	The volume is continually monitored and automatically adjusted to
	Control	normalize audio levels as follows. Default = Standard.
		• Standard – Default. Use for general content which may already be
		companded (compressed and expanded).
		• Light – Peak limiting. Best dynamic range.
		• Moderate – Peak limiting with expansion. Reduced dynamic range.
		• Aggressive – strong normalization, low dynamic range, most
		noticeable.
		• User-Defined – Advanced users only. User Defined values employ
		two thresholds (high level limit and low level boost) which define
		db threshold levels to which volume changes are applied. The low
		level boost threshold defines the threshold whereby lower signals
		lower will be amplified by gain. The gain is applied gradually until
		the audio level is higher than the configured threshold. The high
		level limit threshold defines the threshold whereby signals higher
		than this value will be attenuated until the audio level is reduced to
		a lower value than the threshold.
		Minimum Level – the minimum (boosted) audio level you wish to
		achieve after reaching the threshold.

	Noise Gate	Used to suppress unwanted audio noises that are continuous and
		predictable (for example air conditioning equipment or traffic sounds).
		A a noise gate allows a signal to pass through only when it is above a
		certain threshold. If the signal falls below the threshold no signal is
		allowed to pass.
		Note: The noise gate is particularly useful in AVC (automatic volume
		control) configurations to keep ambient, low-level noise from
		propagating with gain (i.e. being amplified).

	Noise Gate Level	Displayed only if Noise Gate is enabled. Range: -34 to -82 dB.

Audio Template Settings

The lower area of the Audio page has a set of parameters that can be controlled by pre- configured templates. Use the Load Template button to populate the Audio Template Settings with pre-configured audio values. The audio templates vary depending on the selected Audio Source (Stereo, Mono, or Dual). Med Fidelity is the default template. All audio encoder parameters defaults will match these values.

Table 6. Audio Template Settings

Name	Stereo as Mono?	AAC-HE	Sample Freq	Bit Rate †

				Stereo/Dual	Mono

Best Fidelity	Off		48k	256k	84k

High Fidelity	Off		48k	160k	84k

High Fidelity – AAC-HE	Off	Enable	48k	64k	32k

Med Fidelity ††	Off		32k	72k	40k

Med Fidelity - AAC-HE	Off	Enable	32k	40k	24k

VBrick H.264 Appliance Admin Guide

7000 specifications

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Video/Audio Configuration