I have a bit of a rare beast, it converts 24bit 96kHz TOSLINK to USB, so you can feed optical audio data straight into a USB port. Hifime SPDIF Optical to USB converter, record DAT/minidisk to computer
The unit works with a maximum of 24bit 96kHz, if the unit receives a higher bit rate you get distortion and background noise.
What I am looking for is something that has optical input and output that will reduce streams of up to 24bit 192kHz data down to 24bit 96kHz.
I suspect that such an object is even more rare than my optical to USB converter.
The unit works with a maximum of 24bit 96kHz, if the unit receives a higher bit rate you get distortion and background noise.
What I am looking for is something that has optical input and output that will reduce streams of up to 24bit 192kHz data down to 24bit 96kHz.
I suspect that such an object is even more rare than my optical to USB converter.
They are called sample rate converters and you can get them in the usual online places for around £5.00 and up.
192kHz capable toslink connectors are not common these days. it was never the standard, most toslink connections are (and historically have been) only capable of 96kHz. A quick search at digikey doesnt come up with anything in stock and cheap, so it's possible you will have to go outside the normal supply chain. I doubt anyone is making new designs fo that format, as most people that are searching for hires these days are using USB.
I must be looking in the wrong places. I have searched Amazon, eBay & Google, but failed to find anything with optical input and output that outputs above 48kHz. Seeing as my optical to USB is capable of 96kHz I would like to be able to save files at that, as they will be played on decent equipment, on which I know I can hear a big difference between CD quality a HD.
What is your 192k/24 optical source? I have not seen many of those either. I assume rfbrw meant sample rate converter chips (e.g. src4392 or ak4137). There probably does not exist any sample rate converter devices with optical in / optical out.
Re 192kHz source
On of the sources is from a box that my 4K Fire TV plugs into between it and the TV. the Fire TV stick is 192kHz capable and the box outputs Analogue stereo and optical, the spec sheet says it too is 192kHz capable.
On of the sources is from a box that my 4K Fire TV plugs into between it and the TV. the Fire TV stick is 192kHz capable and the box outputs Analogue stereo and optical, the spec sheet says it too is 192kHz capable.
Someone could probably build a DIY 192kHz TOSLINK receiver, then convert that to SPDIF or I2S. Converting the output to USB, that is making the box look like a USB device to PC (or else making it look like PC with a USB port) would probably involve putting a little computer inside the box, maybe an RPi or something. Then there might be some software development to do.
Therefore the most practical solution (assuming the goal is to get 192kHz TOSLINK out of the TV and into a DAC) would be to convert the TOSLINK to SPDIF then use a DAC with with a 192kHz SPDIF input (which is quite common). It still might have to be a DIY project and a scope might be needed to get it working, but it could probably be fairly simple.
Therefore the most practical solution (assuming the goal is to get 192kHz TOSLINK out of the TV and into a DAC) would be to convert the TOSLINK to SPDIF then use a DAC with with a 192kHz SPDIF input (which is quite common). It still might have to be a DIY project and a scope might be needed to get it working, but it could probably be fairly simple.
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"Therefore the most practical solution (assuming the goal is to get 192kHz TOSLINK out of the TV and into a DAC"
I want to get anything up to a 192kHz source and either convert it down to 96kHz so I can use my existing TOSLINK to USB converter, or get it straight to USB. A DAC is not requires as I want it to be digital end to end.
I want to get anything up to a 192kHz source and either convert it down to 96kHz so I can use my existing TOSLINK to USB converter, or get it straight to USB. A DAC is not requires as I want it to be digital end to end.
Okay. Then for a DIY project you would need a TOSLINK receiver module capable of 192kHz operation, an ASRC chip such as SRC4392 to convert 192kHz down to 96kHz, a TOSLINK transmitter module to output 96kHz, a small reference clock module (if lowest digital jitter is a goal), a small microprocessor to configure ASRC chip internal control registers at power-up, various resistors and capacitors, etc., and a power supply for all of the above circuitry. There would be a little bit of programming involved, and a PCB to hold the components would need to be designed. SMD soldering skill would be needed. Might want to put it in a little box too. Overall, taken bit by bit, it shouldn't be very hard to get working (particularly if a scope is available). Also, you could get a lot advice and support along way here in the forum. However, depending on your experience level it might take some time to complete the project.
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It is better to skip the ASRC and just use a spdif receiver (e.g. ak4118) with optical input and connect it to USBI2S bridge capable of I2S input. As a matter of fact I know one suitable USBI2S bridge 😀
Here you go: ADCs and DACs for audio instrumentation applications.
Don't like to advertise too much since it is not a commercial product.
Don't like to advertise too much since it is not a commercial product.
May I ask what the end-target USB device is? A Windows PC perhaps? If so, one might want to be very careful about its internal digital audio processing. One can need to go to some effort to keep Windows Sound Engine from modifying bits and reducing sound quality. Driver protocol support can become an issue.
It is a high end laptop running Linux, the sound system in the laptop is more than capable of doing the job. The version of Linux is designed for audio recording and creation.
High Definition Audio (Intel® HD Audio) hardware is capable of delivering the support and sound quality for up to eight channels at 192 kHz/32-bit quality,
High Definition Audio (Intel® HD Audio) hardware is capable of delivering the support and sound quality for up to eight channels at 192 kHz/32-bit quality,
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I just realised, in the case of the Fire TV stick, I could just plug it into the laptop HDMI port and go from there. But that only takes care of anything that is HDMI sourced. I have other things like a Dune Smart HD H1 that has optical output.
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Sounds better. I do not fully understand your requirements but I'm quite sure there are easier alternatives than what you laid out in your first post. Dune may not need 192k optical input.
Brand Dune
Model Smart H1
Product Media Player
Language English
Filetype PDF
Storage
HDD interface Serial ATA
HDD size 3.5 "
Number of HDDs supported 1
Compatible memory cards SD,SDHC
Supported file systems ext2,ext3,FAT16,FAT32,NTFS
Other features
Connectivity technology Wired
Supported data transfer rates 10, 100 Mbps
Supported network protocols UPnP, HTTP
Power LED ✓
Ports & interfaces
Ethernet LAN (RJ-45) ports 1
Audio (L/R) out 1
HDMI ports quantity 1
DC-in jack ✓
USB 2.0 ports quantity 3
Component video (YPbPr/YCbCr) out 1
Composite video out 1
Digital audio optical out 1
HDMI version 1.3
Network
Networking features Fast Ethernet
Ethernet LAN ✓
Wi-Fi -
Video
Analog signal format system NTSC,PAL
Maximum video resolution 1920 x 1080 pixels
Full HD ✓
HD type Full HD
Audio
Audio decoders Dolby TrueHD,DTS-HD
Audio output channels 7.1 channels
Memory
Internal memory 512 MB
Flash memory 128 MB
Model Smart H1
Product Media Player
Language English
Filetype PDF
Storage
HDD interface Serial ATA
HDD size 3.5 "
Number of HDDs supported 1
Compatible memory cards SD,SDHC
Supported file systems ext2,ext3,FAT16,FAT32,NTFS
Other features
Connectivity technology Wired
Supported data transfer rates 10, 100 Mbps
Supported network protocols UPnP, HTTP
Power LED ✓
Ports & interfaces
Ethernet LAN (RJ-45) ports 1
Audio (L/R) out 1
HDMI ports quantity 1
DC-in jack ✓
USB 2.0 ports quantity 3
Component video (YPbPr/YCbCr) out 1
Composite video out 1
Digital audio optical out 1
HDMI version 1.3
Network
Networking features Fast Ethernet
Ethernet LAN ✓
Wi-Fi -
Video
Analog signal format system NTSC,PAL
Maximum video resolution 1920 x 1080 pixels
Full HD ✓
HD type Full HD
Audio
Audio decoders Dolby TrueHD,DTS-HD
Audio output channels 7.1 channels
Memory
Internal memory 512 MB
Flash memory 128 MB
I'm sure the most critical point is an optical cable if your target is up to 192kHz. If your situation allows a short cable (30cm)and a fixed transmitter, it's probably possible. But I can't completely exclude the possibility of bit errors. SSRC from 192kHz to 96kHz is more straightforward than "cable problem," as far as you are familiar with FPGA design. A commercial chip is also available for conversion. I think a manufacturer can't guarantee an error-free interface at 192kHz. That's why the only possibility is DIY at your own risk.
It need not be complicated. There are many inexpensive boards that can be modified to do what the OP wants. Or one can put something together will relative ease.
24/192 capable optical receiver -> CS8416 SPDIF rx -> CS8421 ASRC -> CS8406 SPDIF tx -> optical transmitter. Not a line of code needed.
24/192 capable optical receiver -> CS8416 SPDIF rx -> CS8421 ASRC -> CS8406 SPDIF tx -> optical transmitter. Not a line of code needed.