On 7/22/14 1:28 PM, Rick Lyons wrote: ...> What's an "mp3"?ask this guy: https://en.wikipedia.org/wiki/Karlheinz_Brandenburg -- r b-j rbj@audioimagination.com "Imagination is more important than knowledge."
Fourier series of sign(cos(.)) in simulation and practical mixer simulation
Started by ●July 15, 2014
Reply by ●July 22, 20142014-07-22
Reply by ●July 23, 20142014-07-23
Rick Lyons <R.Lyons@_BOGUS_ieee.org> writes:> On Sun, 20 Jul 2014 23:56:59 -0400, Randy Yates > <yates@digitalsignallabs.com> wrote: > >>Rick Lyons <R.Lyons@_BOGUS_ieee.org> writes: >> >>> On Sat, 19 Jul 2014 23:16:13 -0400, robert bristow-johnson >>> <rbj@audioimagination.com> wrote: >>> >>> [Snipped by Lyons] >>>>> >>>> >>>>that never worked for me. regular No. 2 pencils were just a little too >>>>skinny and just a little too rounded. but the original Bic pens (you >>>>know, they cost like 39 cents) fit those audio cassettes perfectly for >>>>manual winding (like after recovering from when the deck "ate" my tape). >>>> i also had music on a Teac 3340 real-to-real. that was *my* hi-fi in >>>>the 70s and 80s. >>> >>> Hi Roberto, >>> Reel-to-reel!! Ha ha. You must have been a >>> "reel" quality-audio nutcase. >>> >>> I liked the 8-track music tapes. You never had to >>> pop them out, flip them over, and reinsert them >>> as was needed by the smaller audio cassette tapes. >>> Oh well. Technology advances. >> >>CDs today are like 8-tracks 20 years ago. You can just stick in a usb >>thumbdrive with mp3's into my new Honda (and probably most new cars less >>than 3 years old) and start rockin'. > > Hi Randy, > What's an "mp3"?Hi Rick, Robert answered too, but it's a very common music compression file format. If you have a linear PCM .wav file, you can run an encoder on it and get a .mp3 file, and many players out there will play these .mp3 files. -- Randy Yates Digital Signal Labs http://www.digitalsignallabs.com
Reply by ●July 23, 20142014-07-23
Rick Lyons <R.Lyons@_BOGUS_ieee.org> writes:> On Mon, 21 Jul 2014 12:22:21 GMT, N0Spam@daqarta.com (Bob Masta) > wrote: >> [...] >>One reference I just uncovered at >><www.vinylengine.com/turntable_forum/viewtopic.php> mentions >>tip pressures in the 30,000 to 69,000 psi range for 1g >>tracking force. That fits with my recollections of >>"thousands" of psi. >> >>It also mentions various tip dimensions, from 5 microns >>radius to various geometries such as 3.8 x 76 microns and >>25.4 x 38 microns. >> >>Best regards, > > Hi Bob, > Right. Many decades ago I had that > question as a homework problem. I don't > remember the exact answer but I do remember > the answer is thousands of psi. Neat huh?It's a wonder (individual) vinyl media lasted as long as they did. -- Randy Yates Digital Signal Labs http://www.digitalsignallabs.com
Reply by ●July 23, 20142014-07-23
On Wed, 23 Jul 2014 00:48:42 +0000 (UTC), glen herrmannsfeldt <gah@ugcs.caltech.edu> wrote: [Snipped by Lyons]> >It is a little hard to figure out what the area should be. >As I understand it, the plastic deforms when the tip comes >by, and then, mostly, goes back again. But otherwise, >at a pressure that would seem to really squash things if >applied over a larger area. > >There were tip shapes that try to increase the contact area >while keeping the horizontal (along the groove) distance small. > >For a problem that might be closer to DSP, what is the current >density in the wiring in integrated circuits? Hint: It is >a current that would melt a more ordinary sized wire just >about instantly, and is high enough that electromigration >(the current pushing the atoms along) can happen. > >-- glenHi glen, Ha. That's a neat question. Forgive me but what are the dimensions of current density? Amps per square meter? [-Rick-]
Reply by ●July 23, 20142014-07-23
Rick Lyons <R.Lyons@_bogus_ieee.org> wrote: (snip of an analog recording question, then I wrote)>>For a problem that might be closer to DSP, what is the current >>density in the wiring in integrated circuits? Hint: It is >>a current that would melt a more ordinary sized wire just >>about instantly, and is high enough that electromigration >>(the current pushing the atoms along) can happen.(snip)> Ha. That's a neat question. Forgive me but what are the > dimensions of current density? Amps per square meter?That would be the SI unit, but for some reason it is traditionally amps/cm**2. Also, the current per transistor is decreasing slower than the number of transistors is increasing. There are now processors with Icc over 150 amps. http://www.intel.com/content/www/us/en/processors/itanium/itanium-9300-9500-datasheet.html (see page 42, for example) -- glen
Reply by ●July 23, 20142014-07-23
On Wed, 23 Jul 2014 14:26:46 -0400, Randy Yates <yates@digitalsignallabs.com> wrote: [Snipped by Lyons]> >It's a wonder (individual) vinyl media lasted as long as they did.Hi Randy, You're right. I consider the vinyl record (vinyl album) technology to be a triumph of mechanical and electrical engineering. The earliest "Victrolas" came out just before 1910, if I remember correctly, and vinyl records and turntables were still commonly used up into the mid 1960s. That's a heck of a long "run" for any technology. Randy, while workin' for TRW in the mid 1990's, in that company I knew a EE who told me he'd just spent $3,000 on a super-stable, super-accurate, super-balanced turntable for playing record albums. I'm not jokin' Randy. Whew! ....Talk about a true audiophile. There are people who still cling to old technology. As I wrote in my latest DSP book, published earlier this year, rumor has it that the Rolling Stones' lead guitarist Keith Richards still prefers vacuum-tube audio amplifiers. Clowning around, I also wrote, "Because Mr. Richards has not returned any of my phone calls, I cannot confirm that rumor." Ha ha. [-Rick-]
Reply by ●July 23, 20142014-07-23
On 7/23/14 9:16 PM, glen herrmannsfeldt wrote:> Rick Lyons<R.Lyons@_bogus_ieee.org> wrote: > > (snip of an analog recording question, then I wrote) > >>> For a problem that might be closer to DSP, what is the current >>> density in the wiring in integrated circuits? Hint: It is >>> a current that would melt a more ordinary sized wire just >>> about instantly, and is high enough that electromigration >>> (the current pushing the atoms along) can happen. >ouch. it's not just current prodding them dogies along ("get along little dogies"). it takes a certain amount of heft in them electrons or holes to push them atoms along. that's voltage. get enough current goin' on there and enough voltage and things might start heating up. how big is the transition band between nudging more than the occasional atom along and giving that atom flight?> (snip) > >> Ha. That's a neat question. Forgive me but what are the >> dimensions of current density? Amps per square meter? >sure. like "J" in del x B = J + dE/dt> That would be the SI unit, but for some reason it is traditionally > amps/cm**2. > > Also, the current per transistor is decreasing slower than the number > of transistors is increasing.wiener roast.> There are now processors with Icc > over 150 amps. > > http://www.intel.com/content/www/us/en/processors/itanium/itanium-9300-9500-datasheet.html > > (see page 42, for example) > > -- glen-- r b-j rbj@audioimagination.com "Imagination is more important than knowledge."
Reply by ●July 23, 20142014-07-23
On 7/23/14 9:44 PM, Rick Lyons wrote:> On Wed, 23 Jul 2014 14:26:46 -0400, Randy Yates > <yates@digitalsignallabs.com> wrote: > > [Snipped by Lyons] >> >> It's a wonder (individual) vinyl media lasted as long as they did. > > Hi Randy, > You're right. I consider the vinyl record (vinyl > album) technology to be a triumph of mechanical > and electrical engineering. The earliest "Victrolas" > came out just before 1910, if I remember correctly, and > vinyl records and turntables were still commonly used up > into the mid 1960s. > > That's a heck of a long "run" for any technology. > > Randy, while workin' for TRW in the mid 1990's, in that > company I knew a EE who told me he'd just spent $3,000 > on a super-stable, super-accurate, super-balanced > turntable for playing record albums.direct drive, i s'pose. no friggin' rubber band it that one. (not that i could ever hear the flutter in a good belt-driven turntable. let alone any wow.)> I'm not jokin' Randy. > Whew! ....Talk about a true audiophile.> There are people who still cling to old technology. > As I wrote in my latest DSP book, published earlier this > year, rumor has it that the Rolling Stones' lead > guitarist Keith Richards still prefers vacuum-tube audio > amplifiers.do you mean for his stereo? like in them olden days when "Apple" meant the Beatles and "McIntosh" was no appliance computer? or do you mean Keith Richards still prefers vacuum-tube guitar amps? (because in that case, the Shannon measure of information in that rumor is very close to zero bits.)> Clowning around, I also wrote, "Because Mr. > Richards has not returned any of my phone calls, I cannot > confirm that rumor." Ha ha.where are you at now, Rick. v3? i have your first two, i believe. L8r, -- r b-j rbj@audioimagination.com "Imagination is more important than knowledge."
Reply by ●July 23, 20142014-07-23
On 7/23/14 9:28 AM, Randy Yates wrote:> Rick Lyons<R.Lyons@_BOGUS_ieee.org> writes: > >> On Sun, 20 Jul 2014 23:56:59 -0400, Randy Yates >> <yates@digitalsignallabs.com> wrote: >> >>> Rick Lyons<R.Lyons@_BOGUS_ieee.org> writes: >>> >>>> On Sat, 19 Jul 2014 23:16:13 -0400, robert bristow-johnson >>>> <rbj@audioimagination.com> wrote: >>>> >>>> [Snipped by Lyons] >>>>>> >>>>> >>>>> that never worked for me. regular No. 2 pencils were just a little too >>>>> skinny and just a little too rounded. but the original Bic pens (you >>>>> know, they cost like 39 cents) fit those audio cassettes perfectly for >>>>> manual winding (like after recovering from when the deck "ate" my tape). >>>>> i also had music on a Teac 3340 real-to-real. that was *my* hi-fi in >>>>> the 70s and 80s. >>>> >>>> Hi Roberto, >>>> Reel-to-reel!! Ha ha. You must have been a >>>> "reel" quality-audio nutcase. >>>> >>>> I liked the 8-track music tapes. You never had to >>>> pop them out, flip them over, and reinsert them >>>> as was needed by the smaller audio cassette tapes. >>>> Oh well. Technology advances. >>> >>> CDs today are like 8-tracks 20 years ago. You can just stick in a usb >>> thumbdrive with mp3's into my new Honda (and probably most new cars less >>> than 3 years old) and start rockin'. >> >> Hi Randy, >> What's an "mp3"? > > Hi Rick, > > Robert answered too,one of the cool things about getting to the AES conventions is besides meeting folks like Randy Yates and Greg Berchin and Al Clark there (dunno who i may have left out), you get to meet people who created a little bit of history like Karlheinz Brandenburg and Kees Schouhamer Immink and Bob Moog. never got to meet Ray Dolby and now he's gone (so is Bob Moog) so i guess i never will. -- r b-j rbj@audioimagination.com "Imagination is more important than knowledge."
Reply by ●July 23, 20142014-07-23
Rick Lyons <R.Lyons@_bogus_ieee.org> wrote:> On Wed, 23 Jul 2014 14:26:46 -0400, Randy Yates(snip)>>It's a wonder (individual) vinyl media lasted as long as they did.> You're right. I consider the vinyl record (vinyl > album) technology to be a triumph of mechanical > and electrical engineering. The earliest "Victrolas" > came out just before 1910, if I remember correctly, and > vinyl records and turntables were still commonly used up > into the mid 1960s.I believe well into the 1980's. When we moved at the end of 1989, I moved a box full but never opened it.> That's a heck of a long "run" for any technology.Silver halide photography goes back to about 1840. There is a story about pictures of Yellowstone, on 20x24 in glass negatives, being used to show congress what was there, and convince them to make the first National Park. That was 1872, when the technology was reasonably well developed. Production of silver halide film is falling fast, but not completely gone, but at least 150 years. Roll film (on flexible base, instead of glass) goes back to 1881. (snip)> There are people who still cling to old technology.Sometimes it is just more fun. I still do darkroom work, and it is just more fun than printing out on inkjet printers. -- glen
