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Internal frame synchroniser, Output on video loss, Audio encoding – TANDBERG E5714 User Manual

Page 18: General, 2 audio encoding

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Introduction to the Basic Encoder

Page 1-10

Instruction Manual: evolution 5000 E57xx DSNG and DENG Voyager Encoder

ST.TM.E10076.3

Table 1.4: Video Coding Resolutions

625 Line Modes

525 Line Modes

720 pixels x 576 lines

720 pixels x 480 lines

704 pixels x 576 lines

704 pixels x 480 lines

640 pixels x 576 lines

640 pixels x 480 lines

544 pixels x 576 lines

544 pixels x 480 lines

480 pixels x 576 lines

480 pixels x 480 lines

352 pixels x 576 lines

352 pixels x 480 lines

352 pixels x 288 lines

352 pixels x 240 lines

Internal Frame Synchroniser

An internal frame synchroniser is provided to accommodate slight

differences between the incoming frame rate and that generated by the

stable reference

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used by the Encoder.

Output on Video Loss

The Encoder can be software-configured to show, in the event of video

input loss, either:

·

A test pattern (with or without ident text)

·

A freeze frame (with or without ident text)

·

Cut to a black screen (with or without ident text)

1.3.2

Audio Encoding

General

Audio can be encoded to:

·

MPEG-1 Audio (layer 2) standard (sampling rate 32 kHz or 48 kHz).

·

Dolby Digital (AC-3)

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(sampling rate 32 kHz or 48 kHz)

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.

Output bit-rate is selectable in the range 32 kbit/s - 384 kbit/s

(dependent on configuration) for MPEG-1 Audio (layer 2) and

56 kbit/s - 640 kbit/s (dependent on configuration) for Dolby Digital

(AC-3) coding mode selectable between 1/0 and 2/0.

·

Dolby Digital (AC-3) pre-encoded audio (IEC 61937 specification) in

pass-through mode is also available (it only operates at 48 kHz). This

is where an audio stream has already been encoded externally, prior to

entering the Encoder.

·

Linear PCM

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(SMPTE 302M).

·

Dolby E Pass-through

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.

NOTES…
1.

See Annex G, Audio Modes for details of setting up the audio.

2.

MPEG-1 audio sampling rate is fixed at 48 kHz when controlled from the front panel.

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To ensure broadcast quality it is recommended that the studio reference is fed to HYSNC.

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Dolby Digital (AC-3) is only available when software option M2/ESO2/AC3 is purchased.

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To achieve lip sync in all modes the audio option M2/EOM2/AUDLIN must be used

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