[digitalradio] Re: Real time audio frequency multiplication sofware
Such devices have been used in music industry, especially vocals, guitars, and other instruments. They have been variously known as pitch shifters, pitch scalers, or harmonizers. This function has become a feature in multi-effects boxes for electronic music instruments, recording, and live sound processing. It is done by changing the rescan rate of digitized audio, and some other syncro tricks, and the effect is most recently accomplished in real time with a good DSP engine (or several). The technique for audio timescale pitch modification is used in voice commercials (spots), usually the legal fine print disclaimer heard very fast at the end of the spot. The voice is sped up, but the pitch is then adjusted back lower to the original speed. In my recording studio, I have a DSP multi-effects rack-mount device (with 3 DSP engines in it) that has a pitch change feature, selectable as one of the many presets, and various parameters can be adjusted with a menu, such as octave, percent, or relative pitch change up/down. Perhaps this sort of feature could exist as real time PC computer software, but I don't know. Real time audio and PC computer don't seem to be allowed in the same sentence these days, at least in the Windows world. 73 Bonnie KQ6XA Graham g0nbd wrote: The event time is not changed, so its not like a tape speed changer where the duration is also modified .. amplitude liniartity would be 'nice' but not 100 % important can it be done ? has it ? music production ?
[digitalradio] Phoenix Area PSK on VHF
Anyone in the Phoenix area interested in VHF PSK31?, I'm looking to try and get a FM or SSB 2M net on PSK31 established in the Phoenix area. I know the range isn't like HF, but it could be something to break the same old same old on 2M. Thanks Mike, KE7TQC
Re: [digitalradio] Re: Real time audio frequency multiplication sofware
the software that came with my Sony digital recorder ICD-P320 does this trick. The device will record more than 20 hours. The listener can speed up the playback, the pitch never changes. KE4MZ, Brent Dothan, AL bg...@comcast.net www.wb4zpi.org - Original Message - From: expeditionradio expeditionra...@yahoo.com To: digitalradio@yahoogroups.com Sent: Tuesday, January 27, 2009 3:34 AM Subject: [digitalradio] Re: Real time audio frequency multiplication sofware Such devices have been used in music industry, especially vocals, guitars, and other instruments. They have been variously known as pitch shifters, pitch scalers, or harmonizers. This function has become a feature in multi-effects boxes for electronic music instruments, recording, and live sound processing. It is done by changing the rescan rate of digitized audio, and some other syncro tricks, and the effect is most recently accomplished in real time with a good DSP engine (or several). The technique for audio timescale pitch modification is used in voice commercials (spots), usually the legal fine print disclaimer heard very fast at the end of the spot. The voice is sped up, but the pitch is then adjusted back lower to the original speed. In my recording studio, I have a DSP multi-effects rack-mount device (with 3 DSP engines in it) that has a pitch change feature, selectable as one of the many presets, and various parameters can be adjusted with a menu, such as octave, percent, or relative pitch change up/down. Perhaps this sort of feature could exist as real time PC computer software, but I don't know. Real time audio and PC computer don't seem to be allowed in the same sentence these days, at least in the Windows world. 73 Bonnie KQ6XA Graham g0nbd wrote: The event time is not changed, so its not like a tape speed changer where the duration is also modified .. amplitude liniartity would be 'nice' but not 100 % important can it be done ? has it ? music production ? Announce your digital presence via our Interactive Sked Page at http://www.obriensweb.com/sked Yahoo! Groups Links
Re: [digitalradio] Phoenix Area PSK on VHF
Mike, We started out on SSB using PSK63, then switched to FM using PSK63, but have had the most luck with DominoEx 8 for our twice-weekly FM net, so I suggest you look at DominoEx 8, which is in fldigi or Multipsk. Theoretically, when using FM, drift should not be a problem and PSK31 should work as well as DominoEX, but we have found that for signals under limiting and quieting, DominoEx seems better. For those with FM-only transceivers, VOX is usually not available, so you need an interface with built-in VOX, like the SignaLink USB, for PTT switching by the software. I have developed a low cost alternative interface for FM-only transceivers. The schematic is here: http://home.comcast.net/~kh6ty/interface/schematic.jpg 73, Skip KH6TY - Original Message - From: ke7tqc ke7...@yahoo.com To: digitalradio@yahoogroups.com Sent: Tuesday, January 27, 2009 12:11 AM Subject: [digitalradio] Phoenix Area PSK on VHF Anyone in the Phoenix area interested in VHF PSK31?, I'm looking to try and get a FM or SSB 2M net on PSK31 established in the Phoenix area. I know the range isn't like HF, but it could be something to break the same old same old on 2M. Thanks Mike, KE7TQC
Re: [digitalradio] Phoenix Area PSK on VHF
To make test use low power because the radio finals don't hold long TX. 73' Wilfredo Junior Aviles / KP4ARN Amateur Radio is the best way to know People and Travel around the World, FREE From: kh6ty kh...@comcast.net To: digitalradio@yahoogroups.com Cc: Howard Teller htel...@comcast.net; Ed Foy gl...@bellsouth.net Sent: Tuesday, January 27, 2009 9:33:09 AM Subject: Re: [digitalradio] Phoenix Area PSK on VHF Mike, We started out on SSB using PSK63, then switched to FM using PSK63, but have had the most luck with DominoEx 8 for our twice-weekly FM net, so I suggest you look at DominoEx 8, which is in fldigi or Multipsk. Theoretically, when using FM, drift should not be a problem and PSK31 should work as well as DominoEX, but we have found that for signals under limiting and quieting, DominoEx seems better. For those with FM-only transceivers, VOX is usually not available, so you need an interface with built-in VOX, like the SignaLink USB, for PTT switching by the software. I have developed a low cost alternative interface for FM-only transceivers. The schematic is here: http://home. comcast.net/ ~kh6ty/interface /schematic. jpg 73, Skip KH6TY - Original Message - From: ke7tqc ke7...@yahoo. com To: digitalradio@ yahoogroups. com Sent: Tuesday, January 27, 2009 12:11 AM Subject: [digitalradio] Phoenix Area PSK on VHF Anyone in the Phoenix area interested in VHF PSK31?, I'm looking to try and get a FM or SSB 2M net on PSK31 established in the Phoenix area. I know the range isn't like HF, but it could be something to break the same old same old on 2M. Thanks Mike, KE7TQC
[digitalradio] Re: New MFTT 3.0.147_Beta
Hello Norbert, Yes ok about tuning in, in the first Test I was doing only the transmitting Last night I heard a MFFT station on 80 meters and it was Yussi OH7TE. The signal strength was about s-6 with QSB, so a pretty good signal and I had no problem tuning in and decoding the signal at Half speed. We made contact and later on we changed to 1/4 speed and decoding performed well with a few errors, but had the impression that some kind of FEC would be helpfull. BTW: The auto AFC was doing a fine job! So we will do more testing on the air with MFFT soon. 73 Paul, pa0ocd
Re: [digitalradio] Re: New MFTT 3.0.147_Beta
Hi Paul and the rest I am testing MFFT with some local HAM here. I am running a beacon (double) in MFFT on 14.075 now.I will let it be one for about 20min 73 de LA5VNA Steinar pa0ocd wrote: Hello Norbert, Yes ok about tuning in, in the first Test I was doing only the transmitting Last night I heard a MFFT station on 80 meters and it was Yussi OH7TE. The signal strength was about s-6 with QSB, so a pretty good signal and I had no problem tuning in and decoding the signal at Half speed. We made contact and later on we changed to 1/4 speed and decoding performed well with a few errors, but had the impression that some kind of FEC would be helpfull. BTW: The auto AFC was doing a fine job! So we will do more testing on the air with MFFT soon. 73 Paul, pa0ocd No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.176 / Virus Database: 270.10.14/1918 - Release Date: 27.01.2009 07:26
[digitalradio] Re: New MFTT 3.0.150_Beta
Hi Paul, try the new MFTT 3.0.150_Beta it now has a simple FEC in a way that single damaged characters are suppressed. They will no longer damage the sync of the whole word. Do not expect a wonder, but it will help a bit. I had to double the pause between the words to be able to distinguish between of damaged part of character and end of word. 73's Norbert --- In digitalradio@yahoogroups.com, pa0ocd paulwijn...@... wrote: Hello Norbert, Yes ok about tuning in, in the first Test I was doing only the transmitting Last night I heard a MFFT station on 80 meters and it was Yussi OH7TE. The signal strength was about s-6 with QSB, so a pretty good signal and I had no problem tuning in and decoding the signal at Half speed. We made contact and later on we changed to 1/4 speed and decoding performed well with a few errors, but had the impression that some kind of FEC would be helpfull. BTW: The auto AFC was doing a fine job! So we will do more testing on the air with MFFT soon. 73 Paul, pa0ocd
[digitalradio] DFCW Beacon? on 7040.18
Hi I watching WSPR trace on 7038.60 and found DFCW beacon on 7040.180 (7038.600 + 1.850Hz) from 21:30 to 22:12 (now) Who has TXing? 73's Hisami 7L4IOU
RE: [digitalradio] 500 KHz WSPR center of activity from the uk 502.4 KHz dial usb
Listened for the past 24 hours, nothing over here.. let me know if this is a continuous thing or when I should try to listen again John VE5MU Rx/Tx set infromation Dial frequency 502.4 Khz Mode USB Power ERP (Effective Radiated Rower) RF Carrier freq 503.9 Khz +/- 100 Hz
