Figure 11. Balanced Audio Cable

Table 18. Analog Input for MPEG-2, MPEG-4 and WM Encoders

Configuration

Two channel Stereo

 

 

 

 

Input Connectors

2X

TRS Stereo mini-jacks (L + R)

 

 

 

Input Configuration

Balanced or Unbalanced

 

 

 

 

 

Normal Mode

Alternate Mode (High Headroom)

 

 

 

Input Load Impedance

100k Ohms

100k Ohms

 

 

 

 

Nominal Input level

1.0

Vpp - Unbalanced

1.0 Vpp - Unbalanced

 

0.5

Vpp - Balanced

0.5 Vpp - Balanced

 

 

 

 

Maximum Input level

4.0

Vpp - Unbalanced

8.0 Vpp - Unbalanced

 

2.0 Vpp - Balanced

4.0 Vpp - Balanced

 

 

 

Dynamic Range

94dB

88dB

 

 

 

Encoder Gain Range

+7 to -53dB

+12 to -48dB Note: Depending on the

 

 

 

input level for certain gain adjustments,

 

 

 

the signal could be distorted at the input

 

 

 

to the analog-to-digital converter.

 

 

 

Channel Separation

83dB

83dB

 

 

 

Head Room

12dB

18dB

 

 

 

Noise Floor (Input

-92dB

-92dB

Grounded)

 

 

 

 

 

 

 

The Audio Out ports are also designed for use with a 1/8" mini plug. Cables are available for both balanced and unbalanced applications from electronics specialty stores (e.g. Radio Shack) and from VBrick. Table 19 and Table 20 outline the specifications of the output audio levels.

Table 19. Analog Audio Output for MPEG-2 Decoders (ENDEC configuration)

Configuration

Two channel Stereo

 

 

 

Output Connectors

2X TRS Stereo mini-jacks (L + R)

 

 

 

Output Configuration

Balanced or Unbalanced

 

 

 

 

 

Normal Mode

Alternate Mode (High Headroom)

 

 

 

70

© 2008 VBrick Systems, Inc.

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VBrick Systems VB6000, VB4000, VB5000 manual Vpp Balanced