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Aurora Design SCRF-441NM User And Technical Manual

Standards converter with rf modulator
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Standards Converter
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RF Modulator
User and Technical
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Summary of Contents for Aurora Design SCRF-441NM

  • Page 1 Standards Converter with RF Modulator User and Technical Manual...
  • Page 2 Copyright 2006 DAH Revision 1.8 4 January, 2007...
  • Page 3 Introduction Introduction This manual covers the operation and technical aspects of the Single-Standard Converter with RF Modulator. The Converter is designed to accept an NTSC or PAL/SECAM video signal and convert to one of several different output standards depending on the model. The converted video is sent to the built-in RF Modulator, along with the audio, and to a composite video output connector.

  • Page 4: Front Panel

    Introduction Front Panel The front panel connections are shown below: Composite Left Right Video Audio Audio Input Input Input Status Audio Level Composite Video Input: The Composite video input signal required depends on the operating mode. If the converter is enabled (not bypassed), then a video source conforming to the NTSC or PAL/SECAM video standards must be supplied to the Composite (RCA or BNC) input connector.

  • Page 5: Status Led

    Introduction Status LED: The status LED conveys the current operating state of the converter. Slow Flashing: No video input signal detected. Default image will be output. Solid: Converter locked to video input. Normal operation. Pulsating: Converter in low power Sleep mode. Fast Flashing: Converter storing default image to internal FLASH Audio Level: The Audio Level control is used to set the modulation depth of the audio RF...

  • Page 6: Composite Video Output

    Introduction Composite Video Output: This RCA or BNC connector provides the video output from the converter. This output should terminate into a 75 ohm load. This output is only valid when the converter is not set to bypass mode. If the converter is set to bypass mode, no signal will be present at this output.

  • Page 7: Internal Options

    Introduction the default image is stored in bands of several lines at a time. If the connected video is not stationary during the storing process, the resulting image will be distorted. The best way to provide a stationary image for storing is to use the output from a computer video card, or a DVD/PVR player in pause.
  • Page 8 Introduction The internal Option Switch (S2) has eight controls allowing the user to set the operating mode of the converter. In order to change the switch settings, the cover must be removed from the unit. To do this, first remove all cables from the unit, including the power cable.
  • Page 9 Introduction When these formats were first created, they did not include equalization pulses in the vertical (frame) sync. Because of this, poor interlacing of the image can result due to difficulty of the vertical (frame) oscillator in the television properly locking to the signal.

  • Page 10: Operating Modes

    Introduction Operating Modes Normal Full Operating Mode: When a valid video input is present and an RF Channel is selected, the Status LED will show a Solid light, and the unit will output converted video on the composite output connector and on the RF connector. This is the mode that will most often be used.

  • Page 11: Typical Connections

    Introduction in the RF Modulator Only mode. With this feature, the RF Modulator is shut down, along with the standards converter, image FLASH, and the video output. Only the video decoder is left active to signal when a valid video input is again supplied to the unit to wake it up.

  • Page 12: Theory Of Operation

    Introduction the connected source. This control should be set to the maximum setting without causing distortion of the audio. If the audio is distorted, this control should be lowered slightly. If the audio is low in volume or noisy, this control should be raised. It can be adjusted my inserting a small flat blade screw driver in the hole in the front panel.
  • Page 13 Introduction RF Modulators: Freescale MC44BS373CA (One for video and FM audio, one for AM audio) 30-880MHz Frequency Range Automatic Black Level Clamping μ 76dB V Output Level Image Memory: Atmel AT49BV040A-70VI 512K X 8 FLASH ROM Topology A block diagram of the circuitry is shown below: Options Image Selector/...
  • Page 14 Introduction information directly into the digital data using timing reference makers, or TRS codes. A brief description of the ITU-601/656 specification is as follows: Fundamental quantization frequency: 13.5MHz Pixel Resolution: 720 H x 486 V NTSC / 720 H x 576 PAL Image Aspect Ratio: 4:3 Pixel Aspect Ratio: 1.1 NTSC / 0.9 PAL Horizontal Frequency: 15,734 Hz NTSC / 15,625 Hz PAL...
  • Page 15 Introduction Using these timing signals, the video data that was stored in the partial-field memory synchronous to the incoming ITU video clock can now be clocked out synchronous to the new output clock. The data only needs to be downscaled vertically before being output to the video DAC.

  • Page 16: Spatial Correction

    Introduction want a clock two times higher than this so the output can be over sampled, easing the filter requirements, and yielding a higher SNR. This means the output clock needs to use the base ratio times 3/2 (to get to the 3 clocks per pixel), and then again by 2.
  • Page 17 Introduction By taking more lines into account, a much more accurate representation of the desired ratio can be achieved. By comparing the desired spatial position of the output line to the input lines, and taking a weighted average of several lines around this point, a high quality filter, or interpolator is realized.
  • Page 18 Introduction directly into the video input of the second modulator overrides the internal DC restorer. This allows full control over the AM audio, including initial level and depth. To set the initial carrier level, a DC offset control is provided in the op-amp circuitry that allows the setting of the input bias.

  • Page 19: Updating Firmware

    Introduction Mode 4: This mode is similar to Mode 3 in that it disables the audio carrier, and can be used to examine just the video carrier using an oscilloscope or Spectrum Analyzer. The difference is normal converted video is sent to the modulator so modulation depth can be inspected, among other characteristics.

  • Page 20: Specifications

    Specifications Specifications Video Input: Supported Standards: NTSC 29.97fps / PAL 25fps / SECAM 25fps Video Quantization: 9bit A/D, 8 bit data Video Input: Composite - 1Vpp, 75 ohm impedance Video Output: Video Output: Composite - 1Vpp into 75 ohms Video Quantization: 10 bit Effective D/A Video Levels: +/- 3% of output standard...
  • Page 21 Specifications General: Dimensions: 2.60” X 2.60” X 1.00” (66mm X 66mm X 25mm) Weight: 2.5oz (70g) Power Requirements: 9Vdc typical, 7-14Vdc maximum 2.0 watts typical (Full Operation) 1.0 watt typical (Sleep Mode) Humidity: 20% - 80% non-condensing Temperature: 10C - 45C ambient (50F - 110F)
  • Page 22 Supported Conversions Supported Conversions NTSC to 441/30i: Image / Pixel Aspect Ratios: 4:3 / 1.35 [1.04] Interpolator Clock / Oversample: 34.0 MHz / 3X Active Pixels / Lines: 720 / 406 Horizontal / Vertical Frequency: 13,217 Hz / 29.97 Hz Video Characteristics: 5.7 MHz [4.4 MHz], 1Vpp into 75 ohms, composite sync, 70/30 video/sync ratio...
  • Page 23 Supported Conversions PAL/SECAM to 819/25i: (Belgium) Image / Pixel Aspect Ratios: 4:3 / 0.73 [0.59] Interpolator Clock / Oversample: 53.2 MHz / 2X Active Pixels / Lines: 720 / 760 Horizontal / Vertical Frequency: 20,475 Hz / 25.0 Hz Video Characteristics: 8.9 MHz [6.9MHz], 1Vpp into 75 ohms, composite sync, 70/30 video/sync ratio PAL/SECAM to 455/25i:...
  • Page 24 Supported RF Systems Supported RF Systems System A: Positive video modulation, AM audio modulation, audio carrier level -6dB Switch Positions Channel Video Audio 1 - 2 - 3 - 4 Assignment Frequency Frequency OFF-OFF-OFF-OFF Disabled OFF-OFF-OFF-ON 45.00 MHz 41.5 MHz OFF-OFF-ON-OFF 51.75 MHz 48.25 MHz...
  • Page 25 Supported RF Systems System E: Positive video modulation, AM audio modulation, audio carrier level -6dB Switch Positions Channel Video Audio 1 - 2 - 3 - 4 Assignment Frequency Frequency OFF-OFF-OFF-OFF Disabled OFF-OFF-OFF-ON 46.00 MHz 42.00 MHz OFF-OFF-ON-OFF 52.40 MHz 41.25 MHz OFF-OFF-ON-ON 65.55 MHz...
  • Page 26 Supported RF Systems System F: Positive video modulation, AM audio modulation, audio carrier level -6dB Switch Positions Channel Video Audio 1 - 2 - 3 - 4 Assignment Frequency Frequency OFF-OFF-OFF-OFF Disabled OFF-OFF-OFF-ON 41.25 MHz 46.75 MHz OFF-OFF-ON-OFF 42.25 MHz 47.75 MHz OFF-OFF-ON-ON 48.25 MHz...
  • Page 27 Supported RF Systems System L: Positive video modulation, AM audio modulation, audio carrier level -6dB Switch Positions Channel Video Audio 1 - 2 - 3 - 4 Assignment Frequency Frequency OFF-OFF-OFF-OFF Disabled OFF-OFF-OFF-ON 47.75 MHz 41.25 MHz OFF-OFF-ON-OFF B (F2) 55.75 MHz 49.25 MHz OFF-OFF-ON-ON...
  • Page 28 Supported RF Systems System M (1946 - AM or FM Audio): Negative video modulation, AM or FM audio modulation depending on model, AM audio carrier level -6dB, FM audio carrier level -12dB Switch Positions Channel Video Audio 1 - 2 - 3 - 4 Assignment Frequency Frequency...
  • Page 29 Supported RF Systems System M (1940): Negative video modulation, AM audio modulation, audio carrier level -6dB Switch Positions Channel Video Audio 1 - 2 - 3 - 4 Assignment Frequency Frequency OFF-OFF-OFF-OFF Disabled OFF-OFF-OFF-ON 51.25 MHz 55.75 MHz OFF-OFF-ON-OFF 67.25 MHz 71.75 MHz OFF-OFF-ON-ON 73.25 MHz...
  • Page 30 Supported RF Systems System M (1937): Negative video modulation, AM audio modulation, audio carrier level -6dB Switch Positions Channel Video Audio 1 - 2 - 3 - 4 Assignment Frequency Frequency OFF-OFF-OFF-OFF Disabled OFF-OFF-OFF-ON 45.25 MHz 49.75 MHz OFF-OFF-ON-OFF 51.25 MHz 55.75 MHz OFF-OFF-ON-ON 67.25 MHz...
  • Page 31 Supported RF Systems System M (1934): Negative video modulation, AM audio modulation, audio carrier level -6dB Switch Positions Channel Video Audio 1 - 2 - 3 - 4 Assignment Frequency Frequency OFF-OFF-OFF-OFF Disabled OFF-OFF-OFF-ON 44.75 MHz 47.00 MHz OFF-OFF-ON-OFF 49.75 MHz 52.00 MHz OFF-OFF-ON-ON 54.75 MHz...

  • Page 32: Available Models

    Supported RF Systems Available Models Model No. SCRF-441NM NTSC to 441/30i with all System M (1946) and System M (1940) channels Model No. SCRF-343M NTSC to 343/30i with all System M (1937) and System M (1934) channels Model No. SCRF-525MSC NTSC to 525/30i sequential color with all System M (FM audio) channels Model No.

  • Page 33: Firmware Revision History

    Firmware Revision History Firmware Revision History Revision 1.8, August 26, 2006: 1) Updated 441/25i standard to match German specifications. 2) Added channels B1 and B2 to System E for Berlin transmitter. Revision 1.7, June 18, 2006: 1) Increased internal fpga clock frequency to ease filter design. Revision 1.6, June 12, 2006: 1) Added Sleep Disable feature to Option switch position 7.

This manual is also suitable for:

Scrf-343aScrf-343mScrf-405aScrf-525mscScrf-441peScrf-455e ... Show all

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