Designers and Manufacturers of Development systems and FPGA/ASIC IP cores and for Audio/Video applications

PT4 is a high quality, adaptive 2D/3D comb, multistandard video decoder available as an area efficient IP core for Altera FPGAs. Despite the small area the decoder occupies it offers a near broadcast quality and is free from the artifacts shown by other off the shelf decoders.

• PAL-B/D/G/I/M/N, NTSC-M/J decoding, (SECAM soon).
• 2D 3/5 line comb and asymmetric minimum delay 3D field/frame combs.
• Pixel rate adaptive switching between 'simple notch', line comb, field comb and frame comb.
• 12 bit internal data paths, 10 bit I/O.
• BT656 compatible output.
• Minimum delay mode comb needs no compensating audio delay is required.
• 2-D only comb mode uses internal memory.

The decoder accepts 10-bit composite line locked video sampled at 27MHz together with synchronising signals and clock, (for example from the Analog Devices AD9981 ADC). The decoder is a complementary design.

The colour burst from the input video is used to phase lock the subcarrier oscillator which then addresses a sine and cosine LUT. These waveforms are used to demodulate the colour component of the composite waveform. The resulting U and V colour components are then low pass filtered and applied to a 3 line comb, 263/312 line field comb and 525/625 line frame comb filter.

The chrominance comb adapts between all the available comb modes on a pixel by pixel basis based on the chrominance and luminance amplitude differences across the comb aperture. The resulting combed U and V components provide the colour component outputs where they are amplified and scaled before being formatted to a 10-bit BT656 output. The combed U and V are also remodulated onto the colour subcarrier and subtracted from the composite to produced a combed luminance output which is also scaled and formatted into the BT656 stream.

Control and status registers are written to and read from using a conventional 8 bit wide microprocessor interface.

Please contact SingMai if you wish to arrange a demonstration of the core, enquiries@singmai.com.

The core is supplied as a compiled and encrypted design file for Altera FPGAs and the prices are for a one-off payment which allows unlimited use of the core for a period of 3 years. The core is supplied with 6 months telephone/e-mail support and a 3 year update and bug fix guarantee. After this time the IP core license can be renewed.

For other FPGA vendors, for ASIC applications and for alternative license arrangements please contact SingMai at the e-mail address above.

Full information can be found in the user manual. If you require any further information or a formal quotation please contact enquiries@singmai.com

Download the PT4 user manual

AD9981 datasheet