alarmman62 Posted November 4, 2008 Share Posted November 4, 2008 can any one tell me if i have a dvr without audio on board is there any way i can have audio via a amp or type device Link to comment Share on other sites More sharing options...
Gopher Posted November 5, 2008 Share Posted November 5, 2008 You can add a mic, speaker and amp but it would be a seperate unit totally and the audio wouldn't be recorded on the DVR since the DVR hasn't gotten any audio inputs. Intruder / CCTV / Access Control Technical Support Personal Subscriber to the "K.I.S.S" principle, that's Keep It Simple Stupid, are you? Link to comment Share on other sites More sharing options...
alarmman62 Posted November 5, 2008 Author Share Posted November 5, 2008 You can add a mic, speaker and amp but it would be a seperate unit totally and the audio wouldn't be recorded on the DVR since the DVR hasn't gotten any audio inputs. i gathered that was looking for a second opinion andy Link to comment Share on other sites More sharing options...
Gopher Posted November 5, 2008 Share Posted November 5, 2008 Well as I said you can have audio seperatly just get a suitable mic hook it up to an amp and either a speaker or a set of headphones - you could also plug it into a laptop or a PC which could be viewing the DVR footage that way you have audio in the same place and it might be possible to record the audio on the laptop/PC but how long you could record the audio for depends on the quality you want, since it would be mono it makes the calculation slightly easier but there wouldn't be any form of compression on it which would save you hard drive space. Here's an example - standard sample rate of 44Khz and using 16-bit (will cover all audiable frequencies and give good quality) would take 88K/s to store roughly, you could lower the sample rate - type ones are 22Khz / 16Khz but they would only cover 20Hz-11Khz and 20Hz-8Khz respectivly as the sample rate has to be twice the max frequency your picking up, you could drop the quality to 8-bit which would half the storage but you wouldn't lose any of the higher frequency stuff. All you'd need to do is find some way of putting a Time / Date Stamp on the recording and save say "hour" segements. I'm not saying it's not possible there is no doubt software out there to do this, but you may be better seeing if the DVR you have can't be upgraded to have audio included. However if all you want to do is Hear the audio not play it back then anything that accepts a mic input and has a headphone / speaker output would do. Intruder / CCTV / Access Control Technical Support Personal Subscriber to the "K.I.S.S" principle, that's Keep It Simple Stupid, are you? Link to comment Share on other sites More sharing options...
alarmman62 Posted November 5, 2008 Author Share Posted November 5, 2008 will see if i can get the dvr upgraded or use the usb to pc connection Link to comment Share on other sites More sharing options...
SUBS Posted November 5, 2008 Share Posted November 5, 2008 Well as I said you can have audio seperatly just get a suitable mic hook it up to an amp and either a speaker or a set of headphones - you could also plug it into a laptop or a PC which could be viewing the DVR footage that way you have audio in the same place and it might be possible to record the audio on the laptop/PC but how long you could record the audio for depends on the quality you want, since it would be mono it makes the calculation slightly easier but there wouldn't be any form of compression on it which would save you hard drive space.Here's an example - standard sample rate of 44Khz and using 16-bit (will cover all audiable frequencies and give good quality) would take 88K/s to store roughly, you could lower the sample rate - type ones are 22Khz / 16Khz but they would only cover 20Hz-11Khz and 20Hz-8Khz respectivly as the sample rate has to be twice the max frequency your picking up, you could drop the quality to 8-bit which would half the storage but you wouldn't lose any of the higher frequency stuff. All you'd need to do is find some way of putting a Time / Date Stamp on the recording and save say "hour" segements. I'm not saying it's not possible there is no doubt software out there to do this, but you may be better seeing if the DVR you have can't be upgraded to have audio included. However if all you want to do is Hear the audio not play it back then anything that accepts a mic input and has a headphone / speaker output would do. You can get a Mic pre amp with AVC froms omewhere like Maplins for live audio........but are there not Data Protection issues with recording audio ? Link to comment Share on other sites More sharing options...
alarmman62 Posted November 5, 2008 Author Share Posted November 5, 2008 You can get a Mic pre amp with AVC froms omewhere like Maplins for live audio........but are there not Data Protection issues with recording audio ? we have a data protection certificate on this one Link to comment Share on other sites More sharing options...
ilkie Posted November 5, 2008 Share Posted November 5, 2008 we have a data protection certificate on this one Didn't understand this bit. Can you explain what a data protection certificate is for audio recording with regard to CCTV? Ta Ilkie Link to comment Share on other sites More sharing options...
kensplace Posted November 5, 2008 Share Posted November 5, 2008 You can get software for pc's that records audio straight to mp3, so its highly compressed. I have easy hi-q recorder on my laptop, it ok, sometimes has problems though, but that could just be my old laptop. When its working its pretty configurable, you can set the compression ratio, the recording lengths, have it record all the time or on audio only etc. There will be lots of other similar packages out there that can do the same stuff, just google for them. Link to comment Share on other sites More sharing options...
alarmman62 Posted November 6, 2008 Author Share Posted November 6, 2008 CHECK THE DATA PROTECTION MANUAL IT EXPLAINS ALL THE AREAS OF RECORDINGS GUYS Link to comment Share on other sites More sharing options...
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