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Main / SDI audio embedding and deembedding / PEMB-3305
PEMB-3305 series 4-ch audio SDI embedder with SDI/PAL/SECAM video support |
PROFLEX™ PEMB-3305 multistandard embedders accept up to four audio channels and one PAL/SECAM/SDI video signal to obtain the SDIembedded output.
If paired with the PEXT-3325 deembedder, the PEMB-3305 allows for the following modes of operation:
PEMB-3305 (transmitting side modes) |
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PEXT-3325 (receiving side options) |
PAL/SECAM (undecoded)
Audio |
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OUT A/B: PAL/SECAM (standard as per transmitting side)
Audio |
PAL/SECAM (decoded)
Audio |
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OUT A/B: PAL/SECAM/SDI (user-selectable)
Audio |
OUT A: PAL/SECAM/SDI (user-selectable)
OUT B: always SDI
Audio |
SDI
Audio |
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OUT A/B: PAL/SECAM/SDI (user-selectable)
Audio |
OUT A: PAL/SECAM/SDI (user-selectable)
OUT B: always SDI
Audio |
The input and output audio signal may be in any standard: an analog, AES or combination of both. These modificatiuons are designated the following model indexes:
- four analog balanced inputs (24-bits ADC) – the "AA" index, (f.e. PEMB-3305AA)
- two analog balanced inputs and one balanced AES/EBU input (4 channels totally) – the "AE" index, (f.e. PEMB-3305AE)
- two balanced AES/EBU inputs (4 channels) – the "EE" index, (f.e. PEMB-3305EE)
At a deembedding side the audio format must not necessarily coinside with the one at the source (f.e., an analog input signal embedded is deembedded in the AES/EBU).
Both the embedder (PEMB-3305) and the intended deembedder (PEXT-3325) are featuring the PAL-monitor output with the OSD of the bar-graph audio level meters (quasi-peak and VU).
ÐEMB-3305 features
- multiformat inputs (SDI/PAL/SECAM)
- PAL/SECAM may be transmitted either decoded or "as is"
- analog inputs with high CMRR, cable equalization and overvoltage protection
- automatic cable equalizer on SDI input
- built-in 1kHz test generator
- built-in color bar generator
- signal loss indicator
- EDH status indicators
- automatic detection and indication of an embedded audio in an input SDI signal
- audio group selection for embedding;
- ancillary data stripping capability
- cascadability to allow for embedding of more than four audio groups
- high quality PAL/SECAM decoder
- bargraph audio level meter (quazi-peak and UV) OSD on PAL monitor output
- an analog, AES/EBU or combination of audio inputs
- 10-bits video ADC
- 24-bits audio ADC
- audio gain adjustments for each analog stereo pair or AES/EBU channel
- VBI contents pass-through (WST Teletext compatibility)
Technical specifications
- Input
- PAL/SECAM composite input
| Number of inputs, type |
two, AC-coupled, balanced, with overvoltage protection |
| Input impedance |
75 Ohm, BNC |
| Cable equalization |
0~200m |
| ADC, sampling rate |
10-bits, 27MHz |
| Frequency response ripple (undecoded transmission mode) |
less than 0,2dB, up to 5,75MHz |
Luminance channel frequency response (decoded transmission mode, apperture correction OFF) |
SECAM |
1.0MHz |
2.0MHz |
3.0MHz |
4.0MHz |
4.286MHz |
4.8MHz |
5.8MHz |
±0.1dB |
±0.2dB |
<-2dB |
-6±2dB |
>-40dB |
-3±1dB |
±0.5dB |
PAL |
<0.5dB up to 5.8MHz |
| 2T pulse K-factor |
<0.5% |
| Diff phase |
<0.2% |
| Diff gain |
<0.2% |
| S/N ratio (weighted) |
>65dB |
| Return loss |
better than 40dB at 4,43MHz |
- SDI input
| Input impedance, connector |
75 Ohm, BNC |
| Automatic cable equalization |
up to 100m (8281or similar) |
- Analog AUDIO input
| Connector |
DB-15 |
| Input impedance |
10 kOhm |
| Input type |
balanced |
| 0 dB FS level |
+18dB (+24dB jumper-selectable) |
| Dynamic range |
better than 100dB |
| ADC |
24-bits at 48kHz (20 MSB are embedded) |
| Harmonic distortions and noise |
less than 0,006% |
- AES/EBU input
| Input type |
transformer balanced |
| Connector type |
DB-15 |
| Amplitude |
0.2~4.0V |
| Input impedance |
110 Ohm |
| Maximum input cable length |
up to 100 m of twisted pair |
- Output
- SDI output
| Number of outputs |
one, optionally three (index "-3") |
| Compatibility |
ITU-R BT.656 (embedded audio) |
| Connector type , output impedance |
BNC, 75 Ohm |
| Return loss |
better than 18dB at Ft |
| Amplitude |
800mV±10% |
- PAL monitor output with OSD
| Connector type |
BNC |
| Amplitude |
1000±20mV at 75 Ohm |
| DAC |
10 bits |
| Frequency response |
<3dB to 5,5MHz |
General description
ÐEMB-3305 simplified schematic diagram
PEMB-3305 accepts either analog composite video (PAL/SECAM) or digital (SDI) input video signals and up to four analog or AES/EBU audio channels. SDI input is equalized, decoded into a 10-bits 4:2:2 stream which is processed by a video/audio processor. An analog video input is also equalized/normalized (EQ/GAIN) in a cable equalizer, decoded by a PAL/SECAM decoder and digitized into a 10-bits 4:2:2 stream. The PAL/SECAM decoder may be bypassed - in this case a special mark is inserted in the output stream by which a receiver automatically detects the transmission mode and the receiver's output format cannot be changed then.
The video/audio processor embedds the audio data streams. Input audio may be an analog ("AA" model index), digital AES/EBU ("EE" model index) or combination of both formats ("AE" model index). The SDIembedded signal is present at the "SDI" output on a rear panel.
ÐEMB-3305 rear panel view
ÐEMB-3305-3 rear panel view
Controls and indicators
All the controls and indicators are located at the module's frontal board.
The operation mode is selected by toggling the MODE button, the editing is done by pressing the UP and DOWN buttons.
The following modes are available:
- INP – an input signal format selection
- GROUP – an audio group number selection for embedding
- TON – 1kHz test signal ON/OFF
- METR – an audio bar-graph OSD placement and scale controls
- ANC STRIP – ancillary data stripping ON/OFF
- GAIN – an audio gain controls for each channel or stereo pair
- EDH MIN/HOUR – lit if two or more EDH errors were detected within one hour/minute interval, both LEDs blink if an SDI input is lost
Configuring the PEMB-3305 embedder
The input signal format selection and the built-in color bar generator ON/OFF:
- Sd – SDI input signal
- CS – composite PAL/SECAM input transmitted WITHOUT decoding
- Cd – composite PAL/SECAM input transmitted being decoded (on a receiving side the output format is SDI/PAL/SECAM selectable)
- br – the built-in color bar generator is ON. An autonomous mode, no video input signal is nesessary, the audio embedding or 1kHz test signal are possible
Built-in color bar generator autoinsertion mode:
- SY - insert color bars, keep audio data intact. To enable: in the INP mode, press and hold the MODE button again, press the DOWN button. Release both buttons.
- nS - insert color bars, erase audio data. To enable: in the INP mode, press and hold the MODE button again, press the UP button. Release both buttons.
The audio group number selection:
Toggling the MODE button select the GROUP mode. Pressing the UP and DOWN buttons select an audio group number (1st, 2nd, 3rd, and 4th groups are available).
ATTENTION!
If there is an embedded audio in an input SDI, only the free group numbers will be available to select. For example, if SDIembedded input has the first group audio, only the 2nd, 3rd and 4th could be toggled. It is advisable to select the nearest higher number, i.e. the 2nd group. If we select a currently available group number and later the same group appears at the SDI input - the AUD DET indicator starts blinking notifying about the conflict. The PEMB-3305 stops to embed it's audio and the input SDIembedded audio group is passed through. You should either select any other group or use the ANC STRIP mode to erase the input SDI from any preembedded audio data, the indicator will show the On mode, the conflict will be resolved and there will be no need to change the group number.
The 1kHz test tone operation:
- OF – the test signal is OFF in all channels
- On – the test signal is ON in all channels
- 01...04 – the test signal appears in a selected channel
Selecting the VU METR modes:
Toggling the MODE button select the METR mode. Pressing the UP and DOWN buttons adjust the horizontal position of the VU-meter OSD. Pressing the MODE and DOWN buttons simultaneously switches the OSD off (the indicator shows "On" -> "OF"). Pressing the MODE and UP buttons simultaneously selects the VU-meter scale mode:
- EBU scale, 0dBfs corresponds to +18 dBU (indicator shows "FS")
- quazi-analog scale, 0dBU corresponds to 0,775VRMS (indicator shows "db")
The ancillary data stripping:
In the case of a conflict between a selected audio group number and an input SDIembedded stream one may resolve it by stripping the input SDI signal. Toggling the MODE button select the ANC STRIP mode.Pressing the UP or DOWN buttons enable the stripping mode.
- ANC STRIP OF - the ancillary data stripping is OFF
- ANC STRIP On - the ancillary data stripping is ON
- ANC STRIP AU# - the automatic ancillary data stripping mode: the group number preselected in the GROUP SEL is replaced by the audio being embedded by PEMB-3305. The display shows the actual group number:
- ANC STRIP 1 - the group number 1 is erased from the input SDI signal
- ANC STRIP 2 - the group number 2 is erased from the input SDI signal
- ANC STRIP 3 - the group number 3 is erased from the input SDI signal
- ANC STRIP 4 - the group number 4 is erased from the input SDI signal
The audio gain presets:
Toggling the MODE button select the GAIN mode. Next depressions of the MODE button scrolls through the channel pair number (12 and 34). Pressing the UP and DOWN buttons select gain for a channel pair. While decreasing the gain (by means of the DOWN button) - the left dot LED in the main display blinks, while increasing the gain (by means of the UP button) - the right dot LED in the main display blinks. The audio gain range: ±6dB in 0.2dB increments. The simultaneous depression of the UP and DOWN buttons resets the gain to 0dB and the dot is LED becomes OFF.
The remote control and monitoring
The “PROFLEX” modular system provides the remote controls and monitoring capability. An optional CPU module installed in a rack connects to an IBM PC via the proprietary protocol and software package.
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