On 7/19/14 8:03 PM, Rick Lyons wrote:> On Thu, 17 Jul 2014 12:41:21 -0500, Tim Wescott > <tim@seemywebsite.really> wrote: > >> On Wed, 16 Jul 2014 23:13:14 -0400, robert bristow-johnson wrote: >> >>> On 7/16/14 10:20 PM, Randy Yates wrote: >>>> Tim Wescott<tim@seemywebsite.really> writes: >>>>> [...] >>>>> But really, the reason that God did not make pencils and paper >>>>> disappear the instant that we had Matlab is because He is merciful, >>>>> and we still need them. >>>> >>>> AMEN brother! >>> >>> i don't belong to the sect of pencil heresy. >>> >>> strictly ink, as God Herself intended. >> >> Doing computations in pen and ink implies that you think you are too good >> to ever mess up and need to erase. This erroneous assumption is due to >> arrogance, which is the Devil's own emotion. >> >> SINNER! > > Pencils are ol'-fashioned, and I'm a high tech > guy. The only thing I use a pencil for is to rewind > the magnetic tape back around the take-up reel > of my audio cassette tapes. >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. -- 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 20, 20142014-07-20
Reply by ●July 21, 20142014-07-21
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. Don't laugh at me. There are still guys who put vinyl records on turntables! Here's a homework problem for you high-tech geeks. What was the pressure, measured in pounds per square inch, of the typical diamond phonograph needle as it rode in the grove of a vinyl record? [-Rick-]
Reply by ●July 21, 20142014-07-21
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'. -- Randy Yates Digital Signal Labs http://www.digitalsignallabs.com
Reply by ●July 21, 20142014-07-21
Rick Lyons <R.Lyons@_bogus_ieee.org> wrote: (snip)> Here's a homework problem for you high-tech geeks. > What was the pressure, measured in pounds per > square inch, of the typical diamond phonograph > needle as it rode in the grove of a vinyl record?Spherical, elliptical, or stereohedron? -- glen
Reply by ●July 21, 20142014-07-21
On 7/20/14 11:35 PM, Rick Lyons wrote:> 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. >use to be i couldn't even spel "enjunnear". now i are one.> 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. > > Don't laugh at me. There are still guys who > put vinyl records on turntables! >like me. it's just that i haven't bothered yet to record any of them to mp3. i have Wishbone Ash vinyl that has never been released on CD or anything else.> Here's a homework problem for you high-tech geeks. > What was the pressure, measured in pounds per > square inch, of the typical diamond phonograph > needle as it rode in the grove of a vinyl record? >it's 1.25 ounces divided by a tiny, tiny area. -- r b-j rbj@audioimagination.com "Imagination is more important than knowledge."
Reply by ●July 21, 20142014-07-21
On Mon, 21 Jul 2014 04:55:04 -0400, robert bristow-johnson <rbj@audioimagination.com> wrote:>> Here's a homework problem for you high-tech geeks. >> What was the pressure, measured in pounds per >> square inch, of the typical diamond phonograph >> needle as it rode in the grove of a vinyl record? >> > >it's 1.25 ounces divided by a tiny, tiny area. >Unless you had a really lo-fi turntable, the tracking force was probably more like 1.25 *grams*. 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, Bob Masta DAQARTA v7.60 Data AcQuisition And Real-Time Analysis www.daqarta.com Scope, Spectrum, Spectrogram, Sound Level Meter Frequency Counter, Pitch Track, Pitch-to-MIDI FREE Signal Generator, DaqMusiq generator Science with your sound card!
Reply by ●July 21, 20142014-07-21
On 7/21/14 8:22 AM, Bob Masta wrote:> On Mon, 21 Jul 2014 04:55:04 -0400, robert bristow-johnson > <rbj@audioimagination.com> wrote: > >>> Here's a homework problem for you high-tech geeks. >>> What was the pressure, measured in pounds per >>> square inch, of the typical diamond phonograph >>> needle as it rode in the grove of a vinyl record? >>> >> >> it's 1.25 ounces divided by a tiny, tiny area. >> > > Unless you had a really lo-fi turntable, the tracking force > was probably more like 1.25 *grams*. >thank you for the correction. yupper. grams, not ounces. -- r b-j rbj@audioimagination.com "Imagination is more important than knowledge."
Reply by ●July 22, 20142014-07-22
On Mon, 21 Jul 2014 12:22:21 GMT, N0Spam@daqarta.com (Bob Masta) wrote:>On Mon, 21 Jul 2014 04:55:04 -0400, robert bristow-johnson ><rbj@audioimagination.com> wrote: > >>> Here's a homework problem for you high-tech geeks. >>> What was the pressure, measured in pounds per >>> square inch, of the typical diamond phonograph >>> needle as it rode in the grove of a vinyl record? >>> >> >>it's 1.25 ounces divided by a tiny, tiny area. >> > >Unless you had a really lo-fi turntable, the tracking force >was probably more like 1.25 *grams*. > >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? [-Rick-]
Reply by ●July 22, 20142014-07-22
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"? [-Rick-]
Reply by ●July 22, 20142014-07-22
Rick Lyons <R.Lyons@_bogus_ieee.org> wrote:> On Mon, 21 Jul 2014 12:22:21 GMT, N0Spam@daqarta.com (Bob Masta)(snip, someone wrote)>>>> Here's a homework problem for you high-tech geeks. >>>> What was the pressure, measured in pounds per >>>> square inch, of the typical diamond phonograph >>>> needle as it rode in the grove of a vinyl record?(snip)>>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.(snip)> 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 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. -- glen
