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| Thread ID: 80227 | 2007-06-15 12:53:00 | Mixing audio... | Adamnz (12260) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 559625 | 2007-06-21 11:49:00 | Yes, Thank you very much :) | Adamnz (12260) | ||
| 559626 | 2007-06-21 21:22:00 | If you want a quick crude fix, 2 guitar leads fitted with smaller jack heads at each end, line out on both PC's to a 2 to 1 jack, straight into your source. Ensure your volume settings are low to start off with then adjust accordingly. Very crude but works.:2cents: |
rob_on_guitar (4196) | ||
| 559627 | 2007-06-22 04:10:00 | Supertrouper has described a simple mixer. Although it will reduce the output, and is "theoretically" bad because it is mismatched , it will certainly work, probably very well. :cool: Rob_on_guitar has described the worst possible way to "mix" two outputs. "Crude", yes, "quick", yes, "fix" NO. :groan: |
Graham L (2) | ||
| 559628 | 2007-06-22 07:45:00 | Thanks ALOT supertrouper - tinyurl.com IOU1:thumbs: |
Adamnz (12260) | ||
| 559629 | 2007-06-22 11:17:00 | LOL... good stuff Adam. Nice little adaptor box you made there. Graham is quite correct in saying that it is 'theoretically' bad because it is mismatched - it is VERY mismatched - but it is the easiest, cheapest and most appropriate solution to mixing two or more sources in this situation. Anything more and you simply end up re-inventing the wheel by building something that closely resembles a commercial mixer. |
supertrouper (6665) | ||
| 559630 | 2007-06-22 11:20:00 | Could you explain VERY simply how it works :P ? | Adamnz (12260) | ||
| 559631 | 2007-06-22 11:24:00 | Sure. Electricity goes in one end and comes out the other. You did say "very simply" :D |
supertrouper (6665) | ||
| 559632 | 2007-06-22 11:28:00 | lol, ok slightly more advanced...... | Adamnz (12260) | ||
| 559633 | 2007-06-22 11:53:00 | Sorry, I have a warped sense of humour :lol: Right, I will try to explain it in layman's terms . Ok, the output of a sound source - amplifier, sound card, cassette deck etc has, in simple terms, a "resistance to ground" . So, while the output is sending out a signal, if you were to look back up the pipe so to speak, you would effectively see a 'resistance' to ground . This is called output impedance . I won't go into why it's there or how it's there, it just is . Any resistance to ground will lower the level of your signal . The less resistance you have, the lower the signal will get . A dead short obviously gives you NO signal . Now, your second source also has an output impedance . If you connect your second source directly to the first one, the impedance (resistance to ground) of the first output will attenuate the level of the second output, and vice-versa . Also, you have the two outputs fighting each other (because of complex reasons I won't go into) - suffice it to say they do . By placing a resistor of a suitable value on the output of each source, then tying their other ends together, you now have a 'summing mixer' . The resistors provide a degree of isolation of each source from the other one, and limit the amount of 'fighting' that goes on . Because you have put more resistance in the circuit however, you do lose some signal . In an 'active' mixer, there would be one or more stages of amplification AFTER these resistors, to bring the levels back up to where they were BEFORE the mixing took place . Here endeth audio lesson 1 . 01 :) |
supertrouper (6665) | ||
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