VS1005 4-channel HiRes Recorder

[Henrik]

Hello!

During the last few years, from time to time there have been people asking us whether we could record high-quality PCM to SD cards. Our answer has always been "Unfortunately not, because modern SD cards introduce occasional delays up to one second, so we would need buffer memory to implement that". Today, this changes.

It is with extraordinay pleasure that I present you with the VS1005 HiRes Recorder application. Features of the application are:

• Records up to 96 kHz 24-bit stereo PCM to SD Card. EDIT 190219: 4-channel recording support added
• Maximum supported size of SD card 64 GB (will be expanded later). EDIT 180201: 256 GB successfully tested
• Uses VS23S040 as a 4-Mbit audio buffer.
• Graphical user interface.
• Uses stdaudioin so can be configured to use either VS1005's own ADCs or external ADC.
• Dynamic range 98 dB(A) with VS1005's own ADC.
• For longer recordings, can split audio to multiple 2 GB files with zero sample loss, overcoming FAT32 file size limitations.
• Recording time on 64 GB card from over 30 hours (96k/24b) to over 92 hours (48k/16b).
• Automatic file system recovery if power is lost while recording

.

The HiRes Recorder application can run on two VS1005 boards:

• VS1005 Developer Board + VS1005 Dev. Board Extension 1: http://www.vlsi.fi/en/support/evaluatio ... sion1.html
  • Intended for stand-alone operation.
  • Includes rotary controller and LCD interface.
• VS1005 BreakOut Board v2.0 [EDIT 190410: http://www.vlsi.fi/en/support/evaluatio ... order.html]
  • Intended as a slave to a host microcontroller.
  • Includes UART user interface.

On the Ext1 board, VS1005 HiRes Recorder several of its features: 1.77" LCD, rotary controller, and VS23S040 memory for buffering. The buffer memory is required because modern, large capacity SD cards sometimes pause up to 1 second when they are being written to. The battery backed-up memory of VS1005 is used for bookkeeping while recording, and if the unit loses main power during recording (battery drain, dropping the device, etc), the file system will automatically be restored at next restart, and only up to a few seconds of the recording will be lost.

Attached to this post is v0.30 of the HiRes recorder, as well as its documentation for both the Ext1 and BOB20 boards. You can quickly change #define statements to compile a version for either of the boards.

Have fun!

Kind regards,
- Henrik

[Henrik]

Hello!

Here is a new v0.31 of the HiRes Recorder. It now can gracefully handle situations where an SD card is insterted that contains an unknown file system, like exFAT. In such a case, the HiRes Recorder asks whether to format the card to FAT32. This new version requires VSOS 3.52 or higher to work.

Kind regards,
- Henrik

[Henrik]

Hello!

The documentation for the HiRes Recorder v0.31 says that card sizes up to 64 GB are supported. However, there is actually no intentionally set limit, and I have today successfully tested the recorder with a 128 GB card. Note, however, that for support of cards larger than 32 GB to work you need VSOS 3.52, the version of Format.dl3 that is included in the VSOS 3.52 Root and Libraries package, and HiRes Recorder v0.31.

Kind regards,
- Henrik

[Henrik]

Hello!

Here is a new version 0.32 of the HiRes Recorder. The main new features are:

• Added new section to the documentation, called Features.
• Tested SD cards up to 256 GB (was up to 64 GB).
• Handles better when an SD card is removed and inserted.
• Still compatible with VSOS 3.52, but finalizing recordings is more than an order of magnitude faster when used under VSOS 3.53. Example: Finalizing 17 audio files with a total size of 34.3 GB (16 hours and 34 minutes of 24-bit 96 kHz recording) takes 89 seconds under VSOS 3.52, but only 4 seconds under VSOS 3.53.

Have fun!

Kind regards,
- Henrik

[cruedag]

These are great news for us, thanks a lot for your work, that's a long awaited feature.

I have a question regardign ogg vorbis quality encoding, and don't know if it is better to create a new thread on that issue or not.

I've recently upgrade the VSOS kernel to v3.53 and have found a relevant change in the way that maximum quality ogg vorbis (10 out ot 10) recorded at 48kHz are now stored: now I get a compressed file where an internal 20 KHz cutoff frequency seems to be applied to the recording; the same code gave me up to 24kHz signals (no internal cutoff frequency, antialiasing or whatever you called it) with previous VSOS versions.

Is there any new directive in the libencvorb dll to disable that internal filtering, or is there anyway to recover that feature?

[Henrik]

Hello!

These are great news for us, thanks a lot for your work, that's a long awaited feature.

Yes, I'm pretty excited myself over this new recorder because it now allows for us to store uncompressed audio with zero compromises with audio quality.

I have a question regardign ogg vorbis quality encoding, and don't know if it is better to create a new thread on that issue or not.

Actually, it would be better handled elsewhere, so I've created a new thread so as not to clutter this one. You can find my answers here:
viewtopic.php?f=13&t=2219

Kind regards,
- Henrik

[Henrik]

Hello!

Here is version 0.40 of the HiRes Recorder. This version has some support for Broadcast Wave Format file linking. It should help in making BWF aware programs recognize and link audio streams that span multiple files.

Kind regards,
- Henrik

[Henrik]

Hello!

Attached to this message is the VS1005 HiRes Recorder release 0.51. Hope you enjoy it!

We have also just released the VS1005 BreakOut Board Mark II, which supports the recorder. It is available from here:
http://www.vlsi.fi/en/support/evaluatio ... order.html

Kind regards,
- Henrik

[Hannu]

The VS1005 break out board Mk2 is available in our web-shop: http://webstore.vlsi.fi/VS1005-Breakout-Board-Mk2

Working with the break out board only with jumper wires to set up the boot mode and resetting can be quite time consuming. To get over that slow process, make a small programming board. VHIGH, GND, TX, RX, D0, D1 and XRST are the real minimum. In image below, there is prototype of the programming board which provides UART, reset and S1 button. Building it took something like two hours.

The other board is enhanced version of the prototype. It has internal flash eraser for debricking (short the jumper and reset) and S2 button. We use it to flash the firmware and test break out boards.

Another difference is that the enhanced board has much tighter grip on the break out board, so releasing from prototype board is easier.

Programming boards for VS1005 break out board

progboards.jpg (79.92 KiB) Viewed 4221 times

The schematics are provided for your reference how to build your own programming board. The break out board symbol and footprint can be found from our Eagle library http://www.vlsi.fi/fileadmin/manuals_gu ... e7_lib.zip

Sorry about the clutter which comes from the measuring connectors. In reality those just break further the pins from break out board. The flash eraser (IC1) pulls some pins high as described in viewtopic.php?f=13&t=681#p6868

So building something like those boards is really minimum effort, maximum value when developing software with VS1005 break out board.

[Henrik]

Hello everyone!

We have some exciting new development: The VS1005 HiRes Recorder can now also record 4-channel 24-bit audio!

lcd4ch2.png (9.24 KiB) Viewed 3540 times

If you connect a stereo I2S A/D converter to VS1005, you can now record 4 channels at the same time: both from VS1005 and from the I2S source! This functionality is directly available on the VS1005 Extension Board 1 version 2.0, which amongst other things, contains an I2S ADC. For details on that board, see:
http://www.vlsi.fi/en/support/evaluatio ... sion1.html

To better see what is required to get four channels working, have a good look at the documentation, particularly at the aptly named new Chapter 8: 4-Channel Recording.

This is the very first 4-channel release, so there may be bugs left. If you have any issues, or other comments, please let us know!

Kind regards,
- Henrik