Re: AC line filter question
John, I don't know what you can do. without hearing the noise it would be hard to tell. I guess it will be trial and error. - Original Message - From: John Chilelli j...@neo.rr.com To: PC Audio Discussion List pc-audio@pc-audio.org Sent: Tuesday, September 10, 2013 10:45 PM Subject: Re: AC line filter question Gary, I'm using a new Allen -Heath Zed 10Fx mixing board with usb interface and my cableing is brand new as well. My Win 7 I3, 8gb computer is also brand new and I'm using Audacity 2.0.3. In a way I'm glad you don't think that it is line noise interference. But how do I go about finding the problem? Oh I forgot to mention that I'm using one of two new EV voice quality mics and a Kurzwell K2600. Any suggestions on how I go about finding where the problem may be is appreciated. Thanks, John On 9/10/2013 10:14 PM, Gary Schindler wrote: That doesn't sound like an AC line problem. If you had an AC line problem you would hear a 60 or 120 HZ hum. it wouldn't be high pitched. It may be noisy circuitry in your mixer, coupled with a cabling problem, such as poor shielding or an impedance mismatch. - Original Message - From: John Chilelli j...@neo.rr.com To: PC Audio Discussion List pc-audio@pc-audio.org Sent: Tuesday, September 10, 2013 5:48 PM Subject: AC line filter question Hi all, I am experiencing some sort of high pitch line noise in my recordings. I am using an Allen - Heath mixing board with a usb interface into my Windows 7 computer using Audacity 2.0.4. I was told that I should look into an AC line adapter, but I'm afraid that the entire electrical system for tha room I am using is on one circut, including overhead lights and fans. I wish to be able to get rid of this line noise that exists even with the overhead fan off. Can anyone make a good suggestion as to what I should do for this problem? Thanks, John To unsubscribe from this list, send a blank email to: pc-audio-unsubscr...@pc-audio.org To unsubscribe from this list, send a blank email to: pc-audio-unsubscr...@pc-audio.org To unsubscribe from this list, send a blank email to: pc-audio-unsubscr...@pc-audio.org To unsubscribe from this list, send a blank email to: pc-audio-unsubscr...@pc-audio.org
Re: AC line filter question
John, Here are a couple of thoughts on this, although Gary may have some better ideas. First, have you been able to establish whether you hear the high-pitched sound when recordings are being monitored? I have seen it happen where sounds like this are introduced particularly when playing back a recording made at a lower sampling rate. If you can hear the sound while monitoring the mixer through your computer, then check each of your inputs by turning all of the gains down to see if this problem is being introduced by a particular input. Extraneous noise can easily be introduced by a microphone input if nothing is plugged in but the gain is up for example. If you find that a particular input is causing the problem, then determine if it remains if you disconnect the cable to that input. Knowing which device is causing the problem might help us come up with ideas. Make sure your mixer isn't sitting on top of or just underneath another device such as a modem or router. If you find that you still hear the pitch even with all inputs durned down, the problem is harder to find. However, it is still worth unplugging all cables to the mixer except the USB cable that connects it to the computer to see if the sound disappears. If it does not, you should look at options that affect the USB interface to your computer. Even trying another USB input or another USB cable is worth while. If disconnecting all cables even with the gain turned down removes the problem, reconnect each cable until you figure out which cable starts the problem. If a digital device is connected to that cable, it is possible that the analog output of the digital device doesn't have remaining digital signals filtered out very well. Another possibility is that you have what is called a ground loop. Ground loops most often cause AC hum to be added, but they can cause digitial interference as well. They result when a device has two separate ground paths going to a computer. For example, if you had an audio player connected to computer speakers that are also connected to your computer, a ground path will exist from that device to your speakers and then to your computer. If that device is also connected to the mixer, a second ground path exists from the device, through the mixer, and then to your computer through the USB cable. This isn't an exact science, though, and it can depend some on how various devices are designed, and whether your mixer accepts digital inputs as well as analog inputs and on and on. But you have to narrow down the cause before you can attack it. Another thing to check is whether you have other devices that might emit interference that is getting into your system. For example, older computer monitors or televisions can emit interference. If such a device is too close to your equipment, this can get into your system and result in audible interference when it mixes with other digital signals. Good luck. Best regards, Steve Jacobson On Tue, 10 Sep 2013 22:45:44 -0400, John Chilelli wrote: Gary, I'm using a new Allen -Heath Zed 10Fx mixing board with usb interface and my cableing is brand new as well. My Win 7 I3, 8gb computer is also brand new and I'm using Audacity 2.0.3. In a way I'm glad you don't think that it is line noise interference. But how do I go about finding the problem? Oh I forgot to mention that I'm using one of two new EV voice quality mics and a Kurzwell K2600. Any suggestions on how I go about finding where the problem may be is appreciated. Thanks, John On 9/10/2013 10:14 PM, Gary Schindler wrote: That doesn't sound like an AC line problem. If you had an AC line problem you would hear a 60 or 120 HZ hum. it wouldn't be high pitched. It may be noisy circuitry in your mixer, coupled with a cabling problem, such as poor shielding or an impedance mismatch. - Original Message - From: John Chilelli j...@neo.rr.com To: PC Audio Discussion List pc-audio@pc-audio.org Sent: Tuesday, September 10, 2013 5:48 PM Subject: AC line filter question Hi all, I am experiencing some sort of high pitch line noise in my recordings. I am using an Allen - Heath mixing board with a usb interface into my Windows 7 computer using Audacity 2.0.4. I was told that I should look into an AC line adapter, but I'm afraid that the entire electrical system for tha room I am using is on one circut, including overhead lights and fans. I wish to be able to get rid of this line noise that exists even with the overhead fan off. Can anyone make a good suggestion as to what I should do for this problem? Thanks, John To unsubscribe from this list, send a blank email to: pc-audio-unsubscr...@pc-audio.org To unsubscribe from this list, send a blank email to: pc-audio-unsubscr...@pc-audio.org To unsubscribe from this list, send a blank email to: pc-audio-unsubscr...@pc-audio.org To unsubscribe from
Re: AC line filter question
Steve, I thought of a ground loop as you did, but I never heard a high pitched one, only a 60 cycle one, that is why I ruled it out. you gave him a lot of good suggestions to try. - Original Message - From: Steve Jacobson steve.jacob...@visi.com To: PC Audio Discussion List pc-audio@pc-audio.org Sent: Wednesday, September 11, 2013 10:07 AM Subject: Re: AC line filter question John, Here are a couple of thoughts on this, although Gary may have some better ideas. First, have you been able to establish whether you hear the high-pitched sound when recordings are being monitored? I have seen it happen where sounds like this are introduced particularly when playing back a recording made at a lower sampling rate. If you can hear the sound while monitoring the mixer through your computer, then check each of your inputs by turning all of the gains down to see if this problem is being introduced by a particular input. Extraneous noise can easily be introduced by a microphone input if nothing is plugged in but the gain is up for example. If you find that a particular input is causing the problem, then determine if it remains if you disconnect the cable to that input. Knowing which device is causing the problem might help us come up with ideas. Make sure your mixer isn't sitting on top of or just underneath another device such as a modem or router. If you find that you still hear the pitch even with all inputs durned down, the problem is harder to find. However, it is still worth unplugging all cables to the mixer except the USB cable that connects it to the computer to see if the sound disappears. If it does not, you should look at options that affect the USB interface to your computer. Even trying another USB input or another USB cable is worth while. If disconnecting all cables even with the gain turned down removes the problem, reconnect each cable until you figure out which cable starts the problem. If a digital device is connected to that cable, it is possible that the analog output of the digital device doesn't have remaining digital signals filtered out very well. Another possibility is that you have what is called a ground loop. Ground loops most often cause AC hum to be added, but they can cause digitial interference as well. They result when a device has two separate ground paths going to a computer. For example, if you had an audio player connected to computer speakers that are also connected to your computer, a ground path will exist from that device to your speakers and then to your computer. If that device is also connected to the mixer, a second ground path exists from the device, through the mixer, and then to your computer through the USB cable. This isn't an exact science, though, and it can depend some on how various devices are designed, and whether your mixer accepts digital inputs as well as analog inputs and on and on. But you have to narrow down the cause before you can attack it. Another thing to check is whether you have other devices that might emit interference that is getting into your system. For example, older computer monitors or televisions can emit interference. If such a device is too close to your equipment, this can get into your system and result in audible interference when it mixes with other digital signals. Good luck. Best regards, Steve Jacobson On Tue, 10 Sep 2013 22:45:44 -0400, John Chilelli wrote: Gary, I'm using a new Allen -Heath Zed 10Fx mixing board with usb interface and my cableing is brand new as well. My Win 7 I3, 8gb computer is also brand new and I'm using Audacity 2.0.3. In a way I'm glad you don't think that it is line noise interference. But how do I go about finding the problem? Oh I forgot to mention that I'm using one of two new EV voice quality mics and a Kurzwell K2600. Any suggestions on how I go about finding where the problem may be is appreciated. Thanks, John On 9/10/2013 10:14 PM, Gary Schindler wrote: That doesn't sound like an AC line problem. If you had an AC line problem you would hear a 60 or 120 HZ hum. it wouldn't be high pitched. It may be noisy circuitry in your mixer, coupled with a cabling problem, such as poor shielding or an impedance mismatch. - Original Message - From: John Chilelli j...@neo.rr.com To: PC Audio Discussion List pc-audio@pc-audio.org Sent: Tuesday, September 10, 2013 5:48 PM Subject: AC line filter question Hi all, I am experiencing some sort of high pitch line noise in my recordings. I am using an Allen - Heath mixing board with a usb interface into my Windows 7 computer using Audacity 2.0.4. I was told that I should look into an AC line adapter, but I'm afraid that the entire electrical system for tha room I am using is on one circut, including overhead lights and fans. I wish to be able to get rid of this line noise that exists even with the overhead fan off. Can anyone make a good suggestion as to what I
Re: AC line filter question
Hi Steve, Thanks so much for the ideas you list here. You have given me a lot to look at. I'm going to go down through the list and start looking for the culprit. I'll let you guys know what I come up with. Thanks verry much! John On 9/11/2013 10:07 AM, Steve Jacobson wrote: John, Here are a couple of thoughts on this, although Gary may have some better ideas. First, have you been able to establish whether you hear the high-pitched sound when recordings are being monitored? I have seen it happen where sounds like this are introduced particularly when playing back a recording made at a lower sampling rate. If you can hear the sound while monitoring the mixer through your computer, then check each of your inputs by turning all of the gains down to see if this problem is being introduced by a particular input. Extraneous noise can easily be introduced by a microphone input if nothing is plugged in but the gain is up for example. If you find that a particular input is causing the problem, then determine if it remains if you disconnect the cable to that input. Knowing which device is causing the problem might help us come up with ideas. Make sure your mixer isn't sitting on top of or just underneath another device such as a modem or router. If you find that you still hear the pitch even with all inputs durned down, the problem is harder to find. However, it is still worth unplugging all cables to the mixer except the USB cable that connects it to the computer to see if the sound disappears. If it does not, you should look at options that affect the USB interface to your computer. Even trying another USB input or another USB cable is worth while. If disconnecting all cables even with the gain turned down removes the problem, reconnect each cable until you figure out which cable starts the problem. If a digital device is connected to that cable, it is possible that the analog output of the digital device doesn't have remaining digital signals filtered out very well. Another possibility is that you have what is called a ground loop. Ground loops most often cause AC hum to be added, but they can cause digitial interference as well. They result when a device has two separate ground paths going to a computer. For example, if you had an audio player connected to computer speakers that are also connected to your computer, a ground path will exist from that device to your speakers and then to your computer. If that device is also connected to the mixer, a second ground path exists from the device, through the mixer, and then to your computer through the USB cable. This isn't an exact science, though, and it can depend some on how various devices are designed, and whether your mixer accepts digital inputs as well as analog inputs and on and on. But you have to narrow down the cause before you can attack it. Another thing to check is whether you have other devices that might emit interference that is getting into your system. For example, older computer monitors or televisions can emit interference. If such a device is too close to your equipment, this can get into your system and result in audible interference when it mixes with other digital signals. Good luck. Best regards, Steve Jacobson On Tue, 10 Sep 2013 22:45:44 -0400, John Chilelli wrote: Gary, I'm using a new Allen -Heath Zed 10Fx mixing board with usb interface and my cableing is brand new as well. My Win 7 I3, 8gb computer is also brand new and I'm using Audacity 2.0.3. In a way I'm glad you don't think that it is line noise interference. But how do I go about finding the problem? Oh I forgot to mention that I'm using one of two new EV voice quality mics and a Kurzwell K2600. Any suggestions on how I go about finding where the problem may be is appreciated. Thanks, John On 9/10/2013 10:14 PM, Gary Schindler wrote: That doesn't sound like an AC line problem. If you had an AC line problem you would hear a 60 or 120 HZ hum. it wouldn't be high pitched. It may be noisy circuitry in your mixer, coupled with a cabling problem, such as poor shielding or an impedance mismatch. - Original Message - From: John Chilelli j...@neo.rr.com To: PC Audio Discussion List pc-audio@pc-audio.org Sent: Tuesday, September 10, 2013 5:48 PM Subject: AC line filter question Hi all, I am experiencing some sort of high pitch line noise in my recordings. I am using an Allen - Heath mixing board with a usb interface into my Windows 7 computer using Audacity 2.0.4. I was told that I should look into an AC line adapter, but I'm afraid that the entire electrical system for tha room I am using is on one circut, including overhead lights and fans. I wish to be able to get rid of this line noise that exists even with the overhead fan off. Can anyone make a good suggestion as to what I should do for this problem? Thanks, John To unsubscribe from this list, send a blank email to: pc-audio-unsubscr...@pc
Re: AC line filter question
Yah. I to agree with Gary now that I understand what kind of hum AC interferience can produce. I think it sounds like what I get from a radio near a floresent light, right? And that's not what I am hearing here. On 9/11/2013 12:23 PM, Steve Jacobson wrote: I had a stereo receiver that was connected to a cable box with analog cords and with a 75 ohm cable, and I could hear digital hash unless only one or the other were connected, but there was no AC hum. I never completely resolved it because I got rid of the receiver. smile However, I agree that ground loops are usually the source of AC hum and that it is not likely that it is the source for this problem. Best regards, Steve Jacobson Best regards, Steve Jacobson On Wed, 11 Sep 2013 10:58:28 -0400, Gary Schindler wrote: Steve, I thought of a ground loop as you did, but I never heard a high pitched one, only a 60 cycle one, that is why I ruled it out. you gave him a lot of good suggestions to try. - Original Message - From: Steve Jacobson steve.jacob...@visi.com To: PC Audio Discussion List pc-audio@pc-audio.org Sent: Wednesday, September 11, 2013 10:07 AM Subject: Re: AC line filter question John, Here are a couple of thoughts on this, although Gary may have some better ideas. First, have you been able to establish whether you hear the high-pitched sound when recordings are being monitored? I have seen it happen where sounds like this are introduced particularly when playing back a recording made at a lower sampling rate. If you can hear the sound while monitoring the mixer through your computer, then check each of your inputs by turning all of the gains down to see if this problem is being introduced by a particular input. Extraneous noise can easily be introduced by a microphone input if nothing is plugged in but the gain is up for example. If you find that a particular input is causing the problem, then determine if it remains if you disconnect the cable to that input. Knowing which device is causing the problem might help us come up with ideas. Make sure your mixer isn't sitting on top of or just underneath another device such as a modem or router. If you find that you still hear the pitch even with all inputs durned down, the problem is harder to find. However, it is still worth unplugging all cables to the mixer except the USB cable that connects it to the computer to see if the sound disappears. If it does not, you should look at options that affect the USB interface to your computer. Even trying another USB input or another USB cable is worth while. If disconnecting all cables even with the gain turned down removes the problem, reconnect each cable until you figure out which cable starts the problem. If a digital device is connected to that cable, it is possible that the analog output of the digital device doesn't have remaining digital signals filtered out very well. Another possibility is that you have what is called a ground loop. Ground loops most often cause AC hum to be added, but they can cause digitial interference as well. They result when a device has two separate ground paths going to a computer. For example, if you had an audio player connected to computer speakers that are also connected to your computer, a ground path will exist from that device to your speakers and then to your computer. If that device is also connected to the mixer, a second ground path exists from the device, through the mixer, and then to your computer through the USB cable. This isn't an exact science, though, and it can depend some on how various devices are designed, and whether your mixer accepts digital inputs as well as analog inputs and on and on. But you have to narrow down the cause before you can attack it. Another thing to check is whether you have other devices that might emit interference that is getting into your system. For example, older computer monitors or televisions can emit interference. If such a device is too close to your equipment, this can get into your system and result in audible interference when it mixes with other digital signals. Good luck. Best regards, Steve Jacobson On Tue, 10 Sep 2013 22:45:44 -0400, John Chilelli wrote: Gary, I'm using a new Allen -Heath Zed 10Fx mixing board with usb interface and my cableing is brand new as well. My Win 7 I3, 8gb computer is also brand new and I'm using Audacity 2.0.3. In a way I'm glad you don't think that it is line noise interference. But how do I go about finding the problem? Oh I forgot to mention that I'm using one of two new EV voice quality mics and a Kurzwell K2600. Any suggestions on how I go about finding where the problem may be is appreciated. Thanks, John On 9/10/2013 10:14 PM, Gary Schindler wrote: That doesn't sound like an AC line problem. If you had an AC line problem you would hear a 60 or 120 HZ hum. it wouldn't be high pitched. It may be noisy circuitry in your mixer, coupled with a cabling problem
AC line filter question
Hi all, I am experiencing some sort of high pitch line noise in my recordings. I am using an Allen - Heath mixing board with a usb interface into my Windows 7 computer using Audacity 2.0.4. I was told that I should look into an AC line adapter, but I'm afraid that the entire electrical system for tha room I am using is on one circut, including overhead lights and fans. I wish to be able to get rid of this line noise that exists even with the overhead fan off. Can anyone make a good suggestion as to what I should do for this problem? Thanks, John To unsubscribe from this list, send a blank email to: pc-audio-unsubscr...@pc-audio.org
Re: AC line filter question
That doesn't sound like an AC line problem. If you had an AC line problem you would hear a 60 or 120 HZ hum. it wouldn't be high pitched. It may be noisy circuitry in your mixer, coupled with a cabling problem, such as poor shielding or an impedance mismatch. - Original Message - From: John Chilelli j...@neo.rr.com To: PC Audio Discussion List pc-audio@pc-audio.org Sent: Tuesday, September 10, 2013 5:48 PM Subject: AC line filter question Hi all, I am experiencing some sort of high pitch line noise in my recordings. I am using an Allen - Heath mixing board with a usb interface into my Windows 7 computer using Audacity 2.0.4. I was told that I should look into an AC line adapter, but I'm afraid that the entire electrical system for tha room I am using is on one circut, including overhead lights and fans. I wish to be able to get rid of this line noise that exists even with the overhead fan off. Can anyone make a good suggestion as to what I should do for this problem? Thanks, John To unsubscribe from this list, send a blank email to: pc-audio-unsubscr...@pc-audio.org To unsubscribe from this list, send a blank email to: pc-audio-unsubscr...@pc-audio.org
Re: AC line filter question
Gary, I'm using a new Allen -Heath Zed 10Fx mixing board with usb interface and my cableing is brand new as well. My Win 7 I3, 8gb computer is also brand new and I'm using Audacity 2.0.3. In a way I'm glad you don't think that it is line noise interference. But how do I go about finding the problem? Oh I forgot to mention that I'm using one of two new EV voice quality mics and a Kurzwell K2600. Any suggestions on how I go about finding where the problem may be is appreciated. Thanks, John On 9/10/2013 10:14 PM, Gary Schindler wrote: That doesn't sound like an AC line problem. If you had an AC line problem you would hear a 60 or 120 HZ hum. it wouldn't be high pitched. It may be noisy circuitry in your mixer, coupled with a cabling problem, such as poor shielding or an impedance mismatch. - Original Message - From: John Chilelli j...@neo.rr.com To: PC Audio Discussion List pc-audio@pc-audio.org Sent: Tuesday, September 10, 2013 5:48 PM Subject: AC line filter question Hi all, I am experiencing some sort of high pitch line noise in my recordings. I am using an Allen - Heath mixing board with a usb interface into my Windows 7 computer using Audacity 2.0.4. I was told that I should look into an AC line adapter, but I'm afraid that the entire electrical system for tha room I am using is on one circut, including overhead lights and fans. I wish to be able to get rid of this line noise that exists even with the overhead fan off. Can anyone make a good suggestion as to what I should do for this problem? Thanks, John To unsubscribe from this list, send a blank email to: pc-audio-unsubscr...@pc-audio.org To unsubscribe from this list, send a blank email to: pc-audio-unsubscr...@pc-audio.org To unsubscribe from this list, send a blank email to: pc-audio-unsubscr...@pc-audio.org
A Line In Question
I'm trying to record from tape on to the machine and I want to use the line in. When I used recall-pro it recorded some of the show but didn't record side 2 of the tape for some reason and it didn't record side 1 accurately either. I would prefer not to use what you hear if at all possible unless that's the only way I can do it. Your advice would be greatly appreciated. For editors I have sound forge8D and total recorder and wavepad and recall-pro. Thanks. djc's Jukebox: http://paulmerrell.net:9212 (96K) http://paulmerrell.net:9660 (96K) http://ultrastreams.us:9660 (128K) Saturday Evenings 9 to midnight Eastern. My Journal http://livejournal.com/users/djc1 email Or Msn: [EMAIL PROTECTED] I C Q Number Is: 4781694 Audio List Help, Guidelines, Archives and more... http://www.pc-audio.org To unsubscribe from this list, send a blank email to: [EMAIL PROTECTED]
Re: A Line In Question
Got it working with total recorder guys. Thanks. *** REPLY SEPARATOR *** On 11/9/2007 at 4:49 PM djc wrote: I'm trying to record from tape on to the machine and I want to use the line in. When I used recall-pro it recorded some of the show but didn't record side 2 of the tape for some reason and it didn't record side 1 accurately either. I would prefer not to use what you hear if at all possible unless that's the only way I can do it. Your advice would be greatly appreciated. For editors I have sound forge8D and total recorder and wavepad and recall-pro. Thanks. djc's Jukebox: http://paulmerrell.net:9212 (96K) http://paulmerrell.net:9660 (96K) http://ultrastreams.us:9660 (128K) Saturday Evenings 9 to midnight Eastern. My Journal http://livejournal.com/users/djc1 email Or Msn: [EMAIL PROTECTED] I C Q Number Is: 4781694 Audio List Help, Guidelines, Archives and more... http://www.pc-audio.org To unsubscribe from this list, send a blank email to: [EMAIL PROTECTED] djc's Jukebox: http://paulmerrell.net:9212 (96K) http://paulmerrell.net:9660 (96K) http://ultrastreams.us:9660 (128K) Saturday Evenings 9 to midnight Eastern. My Journal http://livejournal.com/users/djc1 email Or Msn: [EMAIL PROTECTED] I C Q Number Is: 4781694 Audio List Help, Guidelines, Archives and more... http://www.pc-audio.org To unsubscribe from this list, send a blank email to: [EMAIL PROTECTED]
