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Electrical Engineering/Watching Multiple Channels In A Single Television Receiver Set.


Television Receiver Set
Television Receiver Se  
QUESTION: Dear Cleggsan

Is the following System feasible to implement ?.

1. The End user to be able to view multiple channels in a Television Receiver Set. This can be done by splitting Vertically or Horizontally into two or four parts.

This is regarding the video part.

2. Since each channel has different audio, simultaneously viewing
four channels at a time by viewers which are different channels in a single television set will have a limitation of audio, since every channel program will be different audio.

For this we can have four different wireless headphones connected
to the end users. Every end user's headphone will have a buttons similar to remote control which will connect to the respectively television channel.

3. For vertically or Horizontally tiling windows there will be circuit changes in the Remote control circuitry and maybe also the Television Set.

The TV set is rectangular in shape (Aspect ratio of 4:3 i.e width: height ratio), Its not necessary the splitting similar done in computer window by tiling windows horizontally or vertically has 4 windows. viz left top, right top, left bottom, right bottom.

We can also divide the rectangle area by two (2) either horizontal or vertical. i.e. at a single time two channels can be viewed and audio will be heard using the headphones respectively used by the two viewers watching the two channels simultaneously.

Using Wireless Headphones as a accessory will be useful to the two or four viewers of the television system.

This Model can be called as a Split TV Model - allowing the viewers to watch two or four channels at a single time.

The Headphones may or may not be physically wired. If it is wired, there will be four jacks on the Television Receiver for 4 channels split or two jacks on the Television Receiver for 2 channels split.

Those Headphones can be connected i.e. wired and may have length of 3 feet, 5 feet, 10 feet.

Also an advanced technology could have a wireless headphones.

The Remote control will have additional buttons for Split, Inputting Channel Numbers. When the viewer clicks on split button, it allows the user to input channel numbers.

As some examples :

Channel 4 has a Football Match in Sports Channel.
Channel 5 has a Song being sung by an artist in Music Channel.

Now if there is only one User, ideally he would like to listen to the Music Channel 5 and watch the football match on channel 4. so the viewer will use the split button to split the screen into two parts either vertically or horizontally, then input channel
numbers 4,5 and then mute the volume of channel 4 to watch the football match and listen to the song sung by artist on channel 5 using the wireless/wired headphone.

Is it possible to build this system with Advanced Digital Signal Processing (DSP) Techniques, Cable Television etc ?

Awaiting your reply,

Thanks & Regards,
Prashant S Akerkar

ANSWER: Are you thinking to do just one set for your personal use or are you thinking of mass production of such a set for the consumer market?

There are many models available on the market now that hav the PIP (Picture in picture) feature now but they normally only tune in two stations or channels simultaneously.  So, the technology is not difficult.  The problem is cost because such a set requires - in your case - 4 tuning front ends and video processing for each of the four channels.  Split screen technology is no problem and getting the audio out to headphones is no problem.  The big challenge, as stated above, it cost.  The cost may become greater than just purchasing 4 individual receivers!

For example, in the USA a 19 inch digital receiver can be purchased retail for about $100 USD.  A larger set with PIP feature capable of 2 channels is around $2,000 USD.  A 4 channel PIP would like become $4,000 USD.  Just my guesstimations.

Maybe with mass production the costs would be greatly reduced but the market for such type product seems to be very limited here in the USA. Now for studio use in a tv or cable production office you will find professional tools such as these all over the place. You can google for B & H sales company which sell professional video processors that will manipulate multi- channels of video and audio but these are very, very expensive professional products.

Hoping this helps.

---------- FOLLOW-UP ----------

QUESTION: Dear Cleggsan

Thank you.

Is it possible to build this system with Advanced Digital Signal Processing (DSP) Techniques, Cable Television Systems etc ?

Awaiting your reply,

Thanks & Regards,
Prashant S Akerkar

As before, there are already multi channel receivers that have advanced DSP processing built in.  You are only combining them into a custom blended system that has up to 4 channels. You can add n number of channels and just multiply the multiplexing of the signal delivery.

But, you still need a front end receiver (DSP OR Other) for each display window whether on a single display or multiple displays.  Also, there are now many computer software programs that will allow split screen display or mult-display for one big screen, etc.  It is just video graphics technology.

Bottom line is that your proposal is just ordinary technology with some custom engineering to integrate the product concept.  A couple of college computer software students and electrical engineering students could build you a prototype without much supervision. A prototype could be cobbled together using pretty much off-the-shelf components and systems.  Seems so to me.

Wishing you the best.

PS:  DSP is old technology and it can be implemented in many different ways to accomplish any of an almost infinite application or solutions.  There are custom and general purpose dsp boards that are programmed to do lots of things.  Mostly, when a product becomes developed for a final application it will require programming to finalize the instruction set.  An example of this is a project that I am working on for the Karaoke market in Asian countries using ADI DSP chips to synthesize audio and video programs for instant on-call renditions of selections called by users.  Rather than using recordings of multi musical instruments it synthesizes the sounds of a few instruments and calls up a library of op codes to produce the sounds and thereby creating an orchestra to accompany other channels feeding into the final outcome,,,,,,

In Bangalore there is a group of engineers working with ADI  (Analog Devices Inc.) for the integration of advanced audio, video, cable and television applications like the kind you are needing for your multi channel playing system.

I think you could find them with a google or two.  

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