Multiplexer & Quad recording mode switching

[juggle007 0]

i'm still trying to understand all these terms to try and establish if the DVR i am about to purchase will do what i want it to do, when the specs refer to multiplexing, does that mean it is capable of recording both video and sound?

 

the item i'm looking at on ebay appears to be a AV- Tech DVRAVC771 - http://www.avtech.com.tw/english/product_13_771.htm - does anyone know if this can record both video and sound from all 4 cameras simultaneously?

 

also, Quad size 100 images/sec, does this mean the DVR can record each of the 4 cameras at 25fps (100/4?) simultaneously?

 

thanks for any help

 

regards,

 

james

[rory 0]

From using several cheap DVRs, the specs normally are better than the unit themselves. Meaning for example, they dont tell you that 100pps is actually in VCR quality, not DVD (high) quality. If you go high quality it normally drops down to 30 or 15pps.

 

Multiplexer normally means it will record each image seperately as opposed to quad only recording what you see on the screen.

 

According to the specs, it sounds like it is not a true multiplexer DVR, as it claims to record faster in Full Screen. With a multiplexer, it does not matter what you are looking at on the screen, it will always record all of the images the same speed, unless you program them differently. In other words live mode has nothing to do with record mode. With a quad however, it does matter what you are looking at on the screen, so I imagine this is simply a quad. There fore the quality is not as high, a if you are recording in quad, then later play back, you can only play back in quad, therefore if you try to blow up image 1, it is not clear, only in quad mode would it be good. Still its digital so it cant be that bad. Ive never used the quad DVRs yet so I may be mistaken. But I have seen the quad DVRs for around this price, the multiplexed ones are normally more expensive.

 

Now, on the audio note, it does say it has 4 audio inputs, so that would tell me it will record 4 audio devices seperately, or maybe they just give you the ports so you dont have the splice the microphone wires into it or use an audio base station. Got me, cause if it records each audio seperately, then it would normally mean the video is multiplexed also??

 

 

Rory

[AVCONSULTING 0]

It won't record all audio channels at the same time, you can only record one at at time. Unit is a color quad with a single channel dvr built into the same chassis. We sell the same thing under the Vitek name. Made by AVC. We are dumping them out in a closeout. Not that good of a DVR but adequate for a low end 4 camera home system.

[juggle007 0]

thx guys for the info, i'm still looking at some other DVR's but not many offer audio.

 

regards,

 

james