Table of Contents
The analog TV receiver app currently supports wideband amplitude-modulated PAL only. This signal used to be widely adopted for television broadcasts. The picture is assumed to be 625-line x 768-width interlaced but app reduces the image size to 52-line x 128-width to reduce processing overhead and to fit on the PortaPack screen. The resulting 52x128 image is then stretched to 104-line x 128-width for improved proportions, and multiple frames are displayed on top of one another in lieu of de-interlacing (i.e. the first image may be just the odd lines, the second may be the even lines, and repeat).
The app does not yet support sync signals detection, so frames may be misaligned both horizontally and vertically and will tend to drift over time. The picture can temporarily be aligned left/right by moving focus down to the screen area and turning the encoder dial to adjust the offset.
The app only shows black and white images (color images are received but are displayed in black and white).
It is important to manually adjust the amplification settings for improved picture contrast, since this is an amplitude-modulated signal and an automatic gain control is not yet implemented in software.
This app does not yet support NTSC, or SSTV.
References:
https://www.youtube.com/watch?v=VxBReLPbfZc
https://blog.csdn.net/shukebeta008/article/details/104741355
How to collaborate
How to ask questions correctly
User manual
- First steps
- Usage cautions
- Intended use and Legality
- Features
- PortaPack Versions (which one to buy)
- HackRF Versions
- Firmware update procedure
- Description of the hardware
- User interface
- Powering the PortaPack
- Troubleshooting
- Applications
Developer Manual
- Compilation of the firmware
- Compile on WSL with ninja
- How to compile on Windows faster with WSL 2
- Using Docker and Kitematic
- Docker command-line reference
- Using Buddyworks and other CI platforms
- Notes for Buddy.Works (and other CI platforms)
- Using ARM on Debian host
- All in one script for ARM on Debian host
- Compile on Arch based distro (exclude Asahi)
- Dev build versions
- Notes About ccache
- Create a custom map
- Code formatting
- PR process
- Description of the Structure
- Software Dev Guides
- Tools
- Research
- UI Screenshots
- Maintaining
- Creating a prod/stable release (Maintainers only)
- Maintaining rules
- Development States Notes
Note
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