hey, thanks for the stuff on electrical interference. USB devices are particularly prone to interference i have found. This is the one major mistake that Apple have made. All maxed should have three Jack's microphone, headphones and line-in i believe. Michael > On 10 Feb 2015, at 8:10 am, 'Chris Blouch' via MacVisionaries > <[email protected]> wrote: > > Related to this, there are four audio electrical levels. Mic levels are tiny > signals that come out of a mic and usually need to go through a pre-amp > before they can become usable 'line level' signals. Line level is typically > for signal routing such as patching the audio output from a DVD player to the > line input on your Mac. Next up is headphone which is a much stronger signal > as it's going to drive physical movement of something to make sound waves in > your ears. Last is speaker levels which, like headphones, range from a few > watts to thousands to drive room or stadium filling speakers. > > All that is to say, if your TV output is for headphones, direct connecting it > to the line input of your Mac may give distorted sound. It shouldn't hurt > anything but you'll know it when you hear it. Most modern TVs have RCA output > jacks (or something digital on newer sets) which would be line level and a > better source for recording. If not then you'll need something called a > "direct box" which takes a headphone level input and generates a mic level > output which you can then run to a standard mic pre-amp to record. I have a > Mac-mini headphone output going to one of these to run it into a Mackie > mixing console. > > The last bit it hum. This can be any number of things including bad cables, > ground loops and picking up interference from power lines. If it's a low > pitched humm that might be 60-cycle interference as alternating current flips > polarity 60 times a second in the US and 50 in many other countries. In the > case of a ground loop, you can google the explanation but it can sometimes be > when two devices are on two different power circuits. Sometimes as little as > plugging both devices into the same circuit can make that go away. The > aforementioned direct box can also have a 'ground lift' switch which can > eliminate the buzz in some cases. If it's from interference, the only > solution is to move the cables around to try and make it go away or use > better shielded cables. > > Hope this helps. > > CB > > On 2/9/15 3:49 PM, Tim Kilburn wrote: >> Hi, >> >> On a Mac, the headphone jack doubles as a line-in jack. You should be able >> to go direct using 3.5 to 3.5 from the out on your TV to the jack on the >> Mac. Using an app like Audio Hi-Jack Pro would do the recording for you >> nicely. >> >> Later... >> >> Tim Kilburn >> Fort McMurray, AB Canada >> >> On Feb 9, 2015, at 12:34, Michael Marshall <[email protected]> wrote: >> >> hey all, >> i have a TV with a 3.5MM headphone jack witch i used to connect to the mike >> port on my windows computer and record the sound. >> on the mac i have run into some significant difficulties with this. >> Obviously the Mac has no dedicated microphone jack witch can be overcome >> with the iMike USB interface witch i have got. this has a mike jack so i >> thought i would be fine. >> The main problem that I am having is that on that and any other computer a >> lot of USB recording devices including this one have an unpleasant buzzing >> sound. I have found this problem over multiple systems and multiple USB >> devices. My theory is that it is electrical interference between the >> computer and the USB interface. >> what i would like to know is this, is there a way to use the 3.5MM patching >> cable connected to the headphone port on my television to somehow Connect to >> the Mac without USB? because i'm not getting the best Sound with my current >> configurations. >> thanks for any help on this. >> Michael >> > > -- > ¯\_(ツ)_/¯ > > -- > You received this message because you are subscribed to the Google Groups > "MacVisionaries" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/macvisionaries. > For more options, visit https://groups.google.com/d/optout.
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