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Please read the comments policy before publishing your comment. Some of the previous posts show methods of generating analog video with microcontrollers and RF modulation of it using ready made modules.
Analog video is no longer in use in most parts of the world. TV tuner cards for analog signals are no longer manufactured and old ones are difficult or impossible to install on newer computers because there are no drivers. Despite this, analog video capture devices are cheap and widely available. Most are USB dongles, with video and audio inputs, no tuner.
Since I had some old TV tuner cards that were no longer compatible with my PC or had poor performance, I decided to take the tuners out of them. To my surprise, different tuners from different manufacturers looked pretty much the same on the inside. All of them used the same integrated circuits.
The tuners I found are actually complete receivers, with included demodulator. This means you can get analog audio and video straight from the module pins.
There are also modules with FM support, with stereo decoder.
TV – DVD – Multimedia
In the photo below, you can see two tuners. The top one has FM radio support. You can see that it’s similar to the other, but the rightmost compartment has some additional filters for FM IF.
The latter is TV only, with no radio support. Finding the pinout of these modules is not very hard if you analyze the tpi8pb02p they came from.
Even without this, the datasheet for TSA is available. This is the circuit that controls tuner frequency via I2C bus.
Lg Tpi8Psb02P Treiber
Functional modules of the TV tuner Let’s take a look at how these modules work. The RF lh from antenna is split in three paths, then filtered and amplified for each of the frequency bands. There are three frequency bands. The amplified and filtered signals are mixed with local oscillators.
Other tuners may or may not have all pins. I chose this one because it has FM support, therefore some additional pins for radio audio. There is a MUTE pin. AFC and Tpl8psb02p pins are in the same situation.
MPX contains baseband video signal straight from the demodulator, without any filters. This can be used by to decode VBI teletext data. The modules is powered from 5V. The ground connects to the metal case. All tpi8peb02p left is to power up the module. The IC has 4 write registers and 1 read register. Here is an overview. Port bits P7, P5 and P4 select frequency bands.
P2 and P0 control operating mode. When both are 0 not setthe tuner works in TV mode. Setting P0 ypi8psb02p 1 forces power down mode for TV demodulator. To switch to FM mode, set P2 to 1. P1 forces mono mode. P6 should be 0, because it is configured as Tpi8lsb02p input.
Read register contains some important bits. FL is 1 when tuner is locked to frequency.
Let’s write some Arduino compatible code. First, tpi8psn02p tuning TV channels. Control byte is set to 0xCA. Ports bytes is set according to the band in which the frequency fits. To set frequency of local oscillator, IF is added to receiving frequency and the sum is divided by tuning step Some changes are required for ports byte. P2 also needs to be 1.
IF frequency is The sum is divided by 50 tuning step.
Lg Tpi8psb02p Tv Tuner Card Driver Download
Note that ADC reads what you configured it with the ports byte. Pti8psb02p to the capability of tuning to frequencies between 45 to MHz, programming a button based user interface for Arduino is rather difficult. A future post will show a programming example of Windows application that uses CHA to control this tuner.
Anonymous July tpi8pb02p, at 4: Subscribe Don’t forget to check your email and confirm subscription. Overview of TSA registers refer to datasheet.