On Nov 4, 5:43 pm, "starfire151" <starfire...@cableone.net> wrote:
> Has anyone designed (or heard of a design) for a microcontroller-based > system to record microphone inputs directly to a .wav file on a microSD > card?
> Thanks.
> Dave
There's a microphone out there that sports a built-in SD memory card slot. It has a pass-through (I think), so that it can also act just like a normal musician-type microphone. Pricey though. Like: ~ $1,000 US.
I've often thought a low-cost version would be practical. Going wav instead of MP3 should save on hardware costs, and I think folks can live with wav. (?) And with SD Memory card prices so low, the fatness of wav files shouldn't matter all that much anymore...
On Nov 4, 11:43 pm, "starfire151" <starfire...@cableone.net> wrote:
> Has anyone designed (or heard of a design) for a microcontroller-based > system to record microphone inputs directly to a .wav file on a microSD > card?
> Thanks.
> Dave
Sure my Nokia cellphone does that. To Micro SD card.
On a sunny day (Wed, 4 Nov 2009 15:58:53 -0800 (PST)) it happened Jan Panteltje <pantel...@gmail.com> wrote in <57aba14a-013f-498d-b430-4280100f2...@m38g2000yqd.googlegroups.com>:
>On Nov 4, 11:43 pm, "starfire151" <starfire...@cableone.net> wrote: >> Has anyone designed (or heard of a design) for a microcontroller-based >> system to record microphone inputs directly to a .wav file on a microSD >> card?
>> Thanks.
>> Dave
>Sure my Nokia cellphone does that. >To Micro SD card.
Actually it is .amr format, a highly compressed format.
On Nov 4, 5:43 pm, "starfire151" <starfire...@cableone.net> wrote:
> Has anyone designed (or heard of a design) for a microcontroller-based > system to record microphone inputs directly to a .wav file on a microSD > card?
> Thanks.
> Dave
By the way, If anyone's looking for a podcast recorder along the lines of what the OP is looking for,
We use one at our Church. For $125, you can't go wrong. We record direct to MP3 at 44.1 kHz. Sounds great.
I went looking for the other mic I was thinking about, but didn't see it on a quick Google search. Lots of "Karaoke" type mics. I want to say the one I was thinking about was either Panasonic, Shure or maybe Sampson. A big name, anyway. One you'd recognize. I know I tucked it away somewhere (probably my overgrown "favorites" list). If you need it, let me know and I'll dig up the link.
> On Nov 4, 5:43 pm, "starfire151" <starfire...@cableone.net> wrote:
> > Has anyone designed (or heard of a design) for a microcontroller-based > > system to record microphone inputs directly to a .wav file on a microSD > > card?
> > Thanks.
> > Dave
> By the way, > If anyone's looking for a podcast recorder along the lines of what the > OP is looking for,
> We use one at our Church. For $125, you can't go wrong. > We record direct to MP3 at 44.1 kHz. Sounds great.
> I went looking for the other mic I was thinking about, but didn't see > it on a quick Google search. > Lots of "Karaoke" type mics. I want to say the one I was thinking > about was either Panasonic, Shure or maybe Sampson. > A big name, anyway. One you'd recognize. I know I tucked it away > somewhere (probably my overgrown "favorites" list). > If you need it, let me know and I'll dig up the link.
> -mpm
Or a Zoom recorder. The professional digital recorders use compact flash rather than SD.
You really want to make sure these take SDHC. I know the zooms have a 2Gbyte limit per file. You can load up the card, but no file can be longer than 2Gbytes. It might be a limitation of the SDHC card.
> On Nov 4, 5:43 pm, "starfire151" <starfire...@cableone.net> wrote:
> > Has anyone designed (or heard of a design) for a microcontroller-based > > system to record microphone inputs directly to a .wav file on a microSD > > card?
> > Thanks.
> > Dave
> By the way, > If anyone's looking for a podcast recorder along the lines of what the > OP is looking for,
> We use one at our Church. For $125, you can't go wrong. > We record direct to MP3 at 44.1 kHz. Sounds great.
> I went looking for the other mic I was thinking about, but didn't see > it on a quick Google search. > Lots of "Karaoke" type mics. I want to say the one I was thinking > about was either Panasonic, Shure or maybe Sampson. > A big name, anyway. One you'd recognize. I know I tucked it away > somewhere (probably my overgrown "favorites" list). > If you need it, let me know and I'll dig up the link.
> -mpm
Or a Zoom recorder. The professional digital recorders use compact flash rather than SD.
You really want to make sure these take SDHC. I know the zooms have a 2Gbyte limit per file. You can load up the card, but no file can be longer than 2Gbytes. It might be a limitation of the SDHC card.
m...@sushi.com wrote: > On Nov 4, 8:40 pm, mpm <mpmill...@aol.com> wrote: >> On Nov 4, 5:43 pm, "starfire151" <starfire...@cableone.net> wrote:
>>> Has anyone designed (or heard of a design) for a microcontroller-based >>> system to record microphone inputs directly to a .wav file on a microSD >>> card? >>> Thanks. >>> Dave >> By the way, >> If anyone's looking for a podcast recorder along the lines of what the >> OP is looking for,
>> We use one at our Church. For $125, you can't go wrong. >> We record direct to MP3 at 44.1 kHz. Sounds great.
>> I went looking for the other mic I was thinking about, but didn't see >> it on a quick Google search. >> Lots of "Karaoke" type mics. I want to say the one I was thinking >> about was either Panasonic, Shure or maybe Sampson. >> A big name, anyway. One you'd recognize. I know I tucked it away >> somewhere (probably my overgrown "favorites" list). >> If you need it, let me know and I'll dig up the link.
>> -mpm
> Or a Zoom recorder. The professional digital recorders use compact > flash rather than SD.
> You really want to make sure these take SDHC. I know the zooms have a > 2Gbyte limit per file. You can load up the card, but no file can be > longer than 2Gbytes. It might be a limitation of the SDHC card.
don wrote: > m...@sushi.com wrote: >> On Nov 4, 8:40 pm, mpm <mpmill...@aol.com> wrote: >>> On Nov 4, 5:43 pm, "starfire151" <starfire...@cableone.net> wrote:
>>>> Has anyone designed (or heard of a design) for a microcontroller-based >>>> system to record microphone inputs directly to a .wav file on a microSD >>>> card? >>>> Thanks. >>>> Dave >>> By the way, >>> If anyone's looking for a podcast recorder along the lines of what the >>> OP is looking for,
>>> We use one at our Church. For $125, you can't go wrong. >>> We record direct to MP3 at 44.1 kHz. Sounds great.
>>> I went looking for the other mic I was thinking about, but didn't see >>> it on a quick Google search. >>> Lots of "Karaoke" type mics. I want to say the one I was thinking >>> about was either Panasonic, Shure or maybe Sampson. >>> A big name, anyway. One you'd recognize. I know I tucked it away >>> somewhere (probably my overgrown "favorites" list). >>> If you need it, let me know and I'll dig up the link.
>>> -mpm
>> Or a Zoom recorder. The professional digital recorders use compact >> flash rather than SD.
>> You really want to make sure these take SDHC. I know the zooms have a >> 2Gbyte limit per file. You can load up the card, but no file can be >> longer than 2Gbytes. It might be a limitation of the SDHC card.
starfire151 wrote: > Has anyone designed (or heard of a design) for a microcontroller-based > system to record microphone inputs directly to a .wav file on a microSD > card?
> Thanks.
> Dave
The Aus magazine "Silicon Chip" did one within a few months. Google and you can buy the article on-line.
On a sunny day (Thu, 05 Nov 2009 07:05:32 -0700) it happened don <don> wrote in <ftWdndyxUPEwRm_XnZ2dnUVZ_uydn...@forethought.net>:
>> You really want to make sure these take SDHC. I know the zooms have a >> 2Gbyte limit per file. You can load up the card, but no file can be >> longer than 2Gbytes. It might be a limitation of the SDHC card.
>No, its a limitation of FAT32.
Actually 2^32 is > 4.289 GB. Unless MS screwed up big time, that 32 bit file system (hence the name FAT32) should do 4 GB.
The problem with SD and SHDC cards is because of the changed sector sizes (512 byte versus 1024 bytes), and some old hardware or firmware not being able to cope with that.
On Nov 5, 8:21 am, "starfire151" <starfire...@cableone.net> wrote:
> Thanks to all who replied.
> I was really hoping to put together a system based on something like the > dsPIC and an audio codec with an SD or uSD card for storage.
In another thread, I discovered the BlackFin processors were really the way to go for something like this. At the time, I was looking at a fast 8051. (100 MHz variety)
I was (am) still convinced I could handle the data rate (16 bits @ 44.1 kHz sample rate, stereo), AND store it off to an SD card, but it was damn close. You wouldn't think a simple stereo audio project would be such a clock cycle hog, but it is. I guess I have a new-found respect for the iPod designers....
>On Nov 5, 8:21 am, "starfire151" <starfire...@cableone.net> wrote: >> Thanks to all who replied.
>> I was really hoping to put together a system based on something like the >> dsPIC and an audio codec with an SD or uSD card for storage.
>In another thread, I discovered the BlackFin processors were really >the way to go for something like this. >At the time, I was looking at a fast 8051. (100 MHz variety)
>I was (am) still convinced I could handle the data rate (16 bits @ >44.1 kHz sample rate, stereo), AND store it off to an SD card, but it >was damn close. >You wouldn't think a simple stereo audio project would be such a clock >cycle hog, but it is. >I guess I have a new-found respect for the iPod designers....
>-mpm
When you are writing relatively high bandwidth data to SD cards you end up having to have a fair bit of buffer memory IME, and most small microcontrollers don't have much internal RAM available.
mpm wrote: > In another thread, I discovered the BlackFin processors were really > the way to go for something like this. > At the time, I was looking at a fast 8051. (100 MHz variety) > I was (am) still convinced I could handle the data rate (16 bits @ > 44.1 kHz sample rate, stereo), AND store it off to an SD card, but it > was damn close. > You wouldn't think a simple stereo audio project would be such a clock > cycle hog, but it is. > I guess I have a new-found respect for the iPod designers....
Fast microcontroller like AVR is sufficient to store uncompressed audio to flash. However, pretty soon you will find out that you need a full featured file system, a connectivity (USB or Ethernet), some user interface, clock, VOX, AGC, equalizer, data compression, synchronization, etc. etc. etc. The demands grow up quickly to 100MIPS and several hundred K of code and data, which is out of the league of small microcontrollers. BlackFin or TMS55xx would be an adequate choice.
I was (am still thinking about) using a dsPIC33FJ256GP506 running at 80MHz (40MIPS). This chip is supposed to have an itegrated DMA controller which might be able to improve the data transfer to holding buffers. These PICs have a fair amount of internal RAM (over 3.5KB) so I planned to set up a pair of ping-pong buffers for the microSD card interface. I can also probably get by with 22.050KHz sample rate so that might give me a little more time.
I've ordered a DSP development kit from CCS so I should be able to check out some of thesee theories soon :)
> I was really hoping to put together a system based on something like the > dsPIC and an audio codec with an SD or uSD card for storage.
In another thread, I discovered the BlackFin processors were really the way to go for something like this. At the time, I was looking at a fast 8051. (100 MHz variety)
I was (am) still convinced I could handle the data rate (16 bits @ 44.1 kHz sample rate, stereo), AND store it off to an SD card, but it was damn close. You wouldn't think a simple stereo audio project would be such a clock cycle hog, but it is. I guess I have a new-found respect for the iPod designers....
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