Theory of Operation
WFM6100, WFM7000, and WFM7100 With Option FP Service Manual
2- 5
Audio Options:
Options DS, AD, DD, and DDE
The audio option (if installed) resides in the module slot closest to the power
supply. There are four audio options available. Each option adds more capability
to the one listed before it.
H
Option DS adds support for Digital audio monitoring, in both embedded and
AES/EBU formats. This option is available for all models.
H
Option AD adds support for Digital audio monitoring (embedded and
AES/EBU) and for Analog audio monitoring. This option is available for all
models.
H
Option DD adds support for Dolby Digital (AC--3) decode, Digital audio
monitoring (embedded and AES/EBU), and for Analog audio monitoring.
This option is available for WFM7100 and WFM6100 only.
H
Option DDE adds support for Dolby E decode, Dolby Digital (AC--3)
decode, Digital audio monitoring (embedded and AES/EBU), and for
Analog audio monitoring. This option is available for WFM7100 and
WFM6100 only.
All audio versions have the same basic processing engine. This uses an FPGA to
route the audio input into two DSP chips, whose main function is to calculate the
peak values for the selected meter ballistics (response characteristics).
The audio data has two paths to the display. On one path, peak values are sent to
the control processor which then plots the bar and surround displays. On the
second path, raw data samples are sent to the waveform processing engine which
interpolates and plots it to generate the lissajous, or “phase,” display.
Depending on the installed option, there are up to three basic audio input paths:
AES, analog, and embedded. AES inputs are accepted at rates up to 192 kHz.
Analog inputs are digitized at 48 kHz and then go through the same path as the
AES inputs.
The embedded audio path starts at the waveform processing engine. First the
audio samples are extracted from the serial digital video data using a
12.288 MHz oscillator and sent to the audio board. At the audio board the
streams are multiplexed into the AES decoders and then follow the same path as
the AES data. The user can choose to have the de-embedded audio output on the
AES B port.
There are two audio outputs: Analog and AES. Both outputs always follow the
source that is currently selected for the audio bar display. The analog outputs can
Audio Processing
Audio Inputs
Audio Outputs
Summary of Contents for WFM6100 Opt. MB
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Page 12: ...Service Safety Summary viii WFM6100 WFM7000 and WFM7100 With Option FP Service Manual ...
Page 64: ...Repackaging Instructions 4 34 WFM6100 WFM7000 and WFM7100 With Option FP Service Manual ...
Page 76: ...Replaceable Parts 5 12 WFM6100 WFM7000 and WFM7100 With Option FP Service Manual ...
