Related Manuals for Singmai Electronics PT9
Summary of Contents for Singmai Electronics PT9
- Page 1 SingMai Electronics Multi-standard Video Encoder with cross-colour reduction User Manual Revision 0.3 June 2018 PT9 User Manual Revision 0.3 Page 1 of 38...
-
Page 2: Revisions
Date Revisions Version 19-11-2015 First draft. 29-08-2017 Revisions to comb filter. Cross-colour reduction description added. Pre-emphasis added. Cross luma reduction removed. Additions to technical description. 09-06-2018 Minor correction to Table 8. PT9 User Manual Revision 0.3 Page 2 of 38... -
Page 3: Table Of Contents
Interfacing to a DAC ........................27 Specification ..........................28 Measurements .......................... 29 Tables Table 1 PT9 Altera FPGA resource requirements ................... 5 Table 2 PT9 module heirachy........................6 Table 3 Input/Output signals ........................7 Table 4 BT656 Signal Levels ........................9 Table 5 BT656 test waveform (525 line) .................... - Page 4 Figure 10 Zone plate image after line comb decoding................ 16 Figure 11 Zone plate image after frame comb decoding..............17 Figure 12 Zone plate image, line comb decoded from PT9 encoder........... 18 Figure 13 NTSC zone plate with line comb decoder. Left: conventional encoder/line comb decoder.
-
Page 5: Introduction
27MHz, which can be used to directly drive a digital to analogue converter, modulator or other output device. PT9 includes special cross-colour reduction circuitry, particularly of help in reducing artifacts when used with a line comb video decoder. The encoder can also be set to a free-run mode in which it ignores the BT656 timing information and data and uses the clock input to generate a black and burst output. -
Page 6: Pt9 Module Description
SingMai Electronics 2. PT9 Module description The PT9 encoder comprises 10 Verilog modules. PT9_encoder.v is the top level module of the hierarchy; six of the other modules are instantiated from it. Top level level level level PT9_Register_control.v PT9_BT656_receiver.v PT9_SPG.v PT9_encoder.v PT9_Subcarrier_gen.v... -
Page 7: Signal Interconnections
SingMai Electronics 3. Signal Interconnections The PT9 signal interconnect diagram is shown in Figure 1. Figure 1 PT9 Interconnection diagram. The signal descriptions are shown in Table 3, below. Signal Description Clock 27MHz clock input synchronous with the BT656 input data. The BT656 data should be stable at the rising edge of this clock. - Page 8 SingMai Electronics The Verilog instantiation of PT9 is shown below: // Instantiate Video encoder (PT9_encoder) PT9_encoder PT9_encoder_inst .Clock(Clock_sig) , // input Clock_sig .Clock2x(Clock2x_sig) , // input Clock2x_sig .BT656_data(BT656_data_sig) , // input [9:0] BT656_data_sig .RESETn(RESETn_sig) , // input RESETn_sig .A(A_sig) , // input [5:0] A_sig .Din(Din_sig) ,...
-
Page 9: Signal Levels
Green Magenta Blue Black Table 4 BT656 Signal Levels The resulting nominal output levels for a 100% PAL colour bar input are shown in Figure 2. Figure 2 CVBS output levels PT9 User Manual Revision 0.3 Page 9 of 38... -
Page 10: Test Signals
SingMai Electronics 5. Test signals The PT9 is supplied with BT656 test waveforms to facilitate testing and verification. The waveforms are supplied as Excel spreadsheets and are 75% saturation colour bars. Other waveforms can be supplied on request for a small charge. -
Page 11: Technical Overview
The top level module provides the interconnections to the other modules in the IP core. PT9_Register_control.v This module provides the register interface for the PT9. Chapter 8 provides a description of the interface and Chapter 9 provides a description of the registers. -
Page 12: Pt9_Subcarrier_Gen.v
The luminance signal is then passed to the comb filter module to provide the cross-colour reduction. A description of this mode can be found in Chapter 7. The luminance, chrominance and composite sync are then added together to generate the 10-bit 27MHz CVBS signal. PT9 User Manual Revision 0.3 Page 12 of 38... -
Page 13: Figure 5 Luma Interpolation Filter Frequency Response
The last block of the output-proc module is the pre-emphasis block. When driving long lengths of cable with the PT9 there will be a high frequency loss. This is usually compensated for with a high frequency boost network at the receiver (decoder). To provide better compensation the PT9 has a pre-emphasis filter that is matched to response of typical coaxial cable (e.g. -
Page 14: Pt9_Comb_Filter.v
Chapter 7. The comb filter module also provides compensating delays for the chroma components. ram_infer_generic.v This module is a generic single port RAM that is used in the comb filter module. PT9 User Manual Revision 0.3 Page 14 of 38... -
Page 15: Cross-Colour Reduction
The chroma, once demodulated, will always contain high frequency luma. To reduce the interference of the chroma information for monochrome TV receivers, the chroma subcarrier frequency has a fixed phase relationship with respect to the horizontal line frequency. We can PT9 User Manual Revision 0.3 Page 15 of 38... -
Page 16: Figure 10 Zone Plate Image After Line Comb Decoding
2D line comb decoder (where the comb taps are separated by a number of lines). This can be seen in the frame comb decoded image of the zone plate in Figure 11. PT9 User Manual Revision 0.3 Page 16 of 38... -
Page 17: Figure 11 Zone Plate Image After Frame Comb Decoding
Ideally the comb filter architectures for the encoder and decoder should be matched, which is the case for the SingMai PT9 encoder and the PT4 line comb decoder. -
Page 18: Figure 12 Zone Plate Image, Line Comb Decoded From Pt9 Encoder
SingMai Electronics Figure 12 Zone plate image, line comb decoded from PT9 encoder. Figure 13 NTSC zone plate with line comb decoder. Left: conventional encoder/line comb decoder. Right: PT9 encoder with conventional line comb decoder. PT9 User Manual Revision 0.3... -
Page 19: Register Interface
PT9_WRn pulse. The address input also selects the register data that is presented on the PT9_Register_out[7:0] bus. This output is independent of the PT9_CSn or PT9_WRn inputs. Figure 14 Control interface Timing. PT9 User Manual Revision 0.3 Page 19 of 38... -
Page 20: Register Descriptions
Note that, if Control Register bit 7 is asserted (Auto register = ‘1’), then the default values for NTSC-M, PAL, PAL-M and PAL-N will be used by the PT9 and only the Control registers and the pre-emphasis register will be active. - Page 21 * 1/27MHz is the broad pulse width, nominally 27.3us. 11 bit value = (Broad1end2[2:0],Broad1end1[7:0]) Broad2 end 1 Width of the second broad pulse whose leading edge is Half line start. Increments of 1/27MHz. Maximum value = 1715 or 1727 PT9 User Manual Revision 0.3 Page 21 of 38...
-
Page 22: Table 7 Register Descriptions
Luma Scaling 2 10 bit value = (LumaScaling2[1:0],LumaScaling1[7:0]). CVBS gain 1 Composite video gain (used for matching to output stage). 9 bit value = (CVBSgain2[0],CVBSgain1[7:0]). CVBS gain 2 Table 7 Register descriptions PT9 User Manual Revision 0.3 Page 22 of 38... -
Page 23: Horizontal Timing Registers
SingMai Electronics 10. Horizontal timing registers Figures 15 and 16 show the timing specifications for NTSC and PAL-BG respectively. Figure 15 NTSC horizontal timing PT9 User Manual Revision 0.3 Page 23 of 38... -
Page 24: Figure 16 Pal-Bg Horizontal Timing
SingMai Electronics Figure 16 PAL-BG horizontal timing PT9 User Manual Revision 0.3 Page 24 of 38... -
Page 25: Default Register Settings
Note that, if Control Register bit 7 is asserted (Auto-register = ‘1’), then the hard-wired values will be used by PT9 depending on the video standard selected by Control Register 1, bits [5:4]. The hard-wired values are those shown in Table 8. -
Page 26: Table 8 Default Register Settings
Y Pedestal only operates for NTSC-M and PAL-M Y Offset 1 Y Offset 2 Luma Scaling 1 Luma Scaling 2 CVBS gain 1 CVBS gain 2 Table 8 Default Register settings PT9 User Manual Revision 0.3 Page 26 of 38... -
Page 27: Interfacing To A Dac
SingMai Electronics 12. Interfacing to a DAC The SM05 evaluation board provides a suitable platform to evaluate the performance of the PT9 encoder. The digital composite video output and the 27MHz clock can be used to directly drive a DAC – the SM05 board uses an ADI AD9706 12 bit DAC for this purpose. The output of the DAC is filtered and buffered. -
Page 28: Specification
Chrominance luminance delay < +/- 10ns < +/- 10ns Signal to Noise ratio -65dB (black -65dB (black Unweighted input), input), -58dB (luma -58dB (luma ramp). ramp). Latency 129µs 128µs Table 9 PT9 Specifications. PT9 User Manual Revision 0.3 Page 28 of 38... -
Page 29: Measurements
SingMai Electronics 14. Measurements The PT9 multistandard encoder was measured using an SM05 evaluation board (with Altera EP4CE15 FPGA). The source was the PT6 video pattern generator IP core which provided the 10-bit BT656 input to the PT9 encoder. The composite digital output was converted to analogue using an Analog Devices AD9706 12 bit digital to analogue converter (top 10 bits driven). -
Page 30: Figure 19 Ntsc Horizontal Timing
SingMai Electronics Figure 19 NTSC Horizontal Timing Figure 20 NTSC 75% Colour bar PT9 User Manual Revision 0.3 Page 30 of 38... -
Page 31: Figure 21 Ntsc Chroma/Luma Delay
SingMai Electronics Figure 21 NTSC Chroma/Luma delay Figure 22 NTSC K Factor PT9 User Manual Revision 0.3 Page 31 of 38... -
Page 32: Figure 23 Ntsc Multiburst (No Sinx/X Correction)
SingMai Electronics Figure 23 NTSC Multiburst (No sinx/x correction) Figure 24 NTSC Noise Spectrum (Black) PT9 User Manual Revision 0.3 Page 32 of 38... -
Page 33: Figure 25 Ntsc Noise Spectrum (Luma Ramp)
SingMai Electronics Figure 25 NTSC Noise Spectrum (luma ramp) Figure 26 PAL Vertical blanking interval PT9 User Manual Revision 0.3 Page 33 of 38... -
Page 34: Figure 27 Pal Horizontal Timing
SingMai Electronics Figure 27 PAL Horizontal timing Figure 28 PAL 75% Colour bars PT9 User Manual Revision 0.3 Page 34 of 38... -
Page 35: Figure 29 Pal Chroma/Luma Delay
SingMai Electronics Figure 29 PAL Chroma/Luma delay Figure 30 PAL K-factor PT9 User Manual Revision 0.3 Page 35 of 38... -
Page 36: Figure 31 Pal Multiburst (No Sinx/X Correction)
SingMai Electronics Figure 31 PAL Multiburst (no sinx/x correction) PT9 User Manual Revision 0.3 Page 36 of 38... -
Page 37: Figure 32 Pal Noise Spectrum (Black)
SingMai Electronics Figure 32 PAL Noise spectrum (black) PT9 User Manual Revision 0.3 Page 37 of 38... -
Page 38: Figure 33 Pal Luma Non-Linearity
SingMai Electronics Figure 33 PAL Luma non-linearity PT9 User Manual Revision 0.3 Page 38 of 38...
Need help?
Do you have a question about the PT9 and is the answer not in the manual?
Questions and answers