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Questions tagged [spdif]

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FPGA direct coaxial output is not working

I am using a Zynq device and trying to create a coaxial output port. To achieve this, I first connected the output of the I/O port to an LED and verified that it works correctly by inputting it into ...
fnclovers's user avatar
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1 answer
126 views

How long is the S/PDIF preamble?

I have a simple S/PDIF protocol question that I can't find the answer to anywhere. I'm trying to understand the protocol, and everywhere I look says the same thing: The length of a preamble pattern is ...
ezra_vdj's user avatar
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1 answer
100 views

Sample Rate Converter

I'm a novice when it comes to digital audio. What's the best way to convert 48 kHz I2S to 44.1 kHz? I have found the Texas Instruments SRC4392 but I do not believe that it will work for this ...
t3ddftw's user avatar
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1 answer
499 views

S/PDIF standard sample rate and channel status bits

I am planning to create a S/PDIF output stream for a digital audio device, but there is some ambiguity on the standard and how it is used. I would like to have the confusion cleared up. To start, ...
techmann's user avatar
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1 answer
134 views

Can I connect S/PDIF line from TOSLINK to coax?

Since the original analog audio in my device (MiSTerfpga) is bad, I'm using an external TOSLINK-to-RCA-stereo DAC. Now I'd like to merge this setup into the device. I'd like to know if wiring the S/...
Alex's user avatar
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2 votes
2 answers
493 views

SPDIF to CMOS logic

I am trying to get around my head on the three questions below. Is SPDIF protocol is really driving 0.5 V pk-pk without having any DC offset? If yes, HDMI1.4 mentions ARC protocol which is adhered ...
Atharva Upadhye's user avatar
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1 answer
55 views

non-trademarked name for Toslink connector?

My PC motherboard has header pins for a SPDIF output and I want to an optical SPDIF transmitter. When I search any of the main electronic stores for optical SPDIF transmitter I dont get any good hits, ...
Jay 's user avatar
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0 answers
93 views

Triggering a relay with S/PDIF?

I would like to use my audio interface to trigger a mains relay, as soon as the audio interface is turned on. Unfortunately, the interface turns on electronically, as opposed to using a mechanical ...
pilau's user avatar
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2 answers
872 views

Audio: what do I need to do to get SPDIF data to a speaker?

I'm working on a speaker project where I'd like to use a microcontroller's SPDIF output (aka IEC 60958) to drive audio data to a speaker. I've' been doing research on the topic, and I'm having trouble ...
Chris Fernandez's user avatar
2 votes
3 answers
3k views

S/PDIF: TTL to Coax Converter

I'm working on converting TTL S/PDIF to Coaxial level (0.5Vpp). I have implemented the following circuit using a Toshiba TC7W04, which is a 74HC04-type inverter: But it does not appear to work in ...
t3ddftw's user avatar
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SMB Connector Grounding for S/PDIF Coax

I'm transmitting coax level S/PDIF over an SMB connector, and I'm wondering if the "body" pins (all pins that aren't the center) should be left floating, or if they should be connected to ground. As ...
t3ddftw's user avatar
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1 answer
205 views

Splitting Coaxial S/PDIF

I'm looking to output a single S/PDIF output from a BC127 to a coaxial output as well as a WM8804 S/PDIF transceiver at the same time. So far, it doesn't appear that this works, but there could be ...
t3ddftw's user avatar
  • 515
1 vote
2 answers
2k views

Logic inverter feedback resistor, SPDIF Input/Ouput circuit

What purpose of these resistors? Spdif level about 0.5Vpp. Do I need use feedback resistor if I will convert 3.3V SPDIF to 5V? I want to make 4-way SPDIF Input/Output for WM8805 I2S<>SPDIF ...
Yiffme's user avatar
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1 answer
179 views

WM8804 audio routing question

The WM8804 looks like the ideal candidate for a design I'm working on --- this single chip could replace the need for one receiver and one transmitter. The specific routing requirements are: I need ...
Cal-linux's user avatar
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1 vote
1 answer
225 views

XO selection for 44.1kHz audio

I'm implementing a WM8804 S/PDIF transmitter in a project I'm working on. The datasheet states that clocks from 10MHz - 27MHz are supported. What crystal oscillator frequency should I look for in ...
t3ddftw's user avatar
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1 vote
2 answers
2k views

I2S MCLK Generation

I'm working with a Sierra Wireless BC127 (Bluetooth Module) I2S master which is generating Left-Justified, 16 bps @ 44.1khz sample rate. The Bit clock is set to 2.822 Mhz. I want to use a Cirrus ...
t3ddftw's user avatar
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1 vote
1 answer
2k views

Coaxial S/PDIF input circuit

Can someone shed some light on the rationale for the SPDIF coaxial input circuits in: (1) the DIR9001 evaluation board (see schematics, page 7), and (2) in this Application Note from ST (see Figure 10 ...
Cal-linux's user avatar
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1 vote
3 answers
485 views

S/PDIF over mini TRS jack

I am designing a small digital synthesizer. Because of space constrictions, I can only use 3.5mm TRS connectors. RCA is already too big. If possible, I'd like to include not only an analog output, ...
Spatz's user avatar
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1 vote
2 answers
652 views

How to convert a CD player's coax diigital output to a Toslink?

My question is essentially the same as this one, except my signal flow is in the opposite direction: Connecting an optical transmitter to a S/PDIF coaxial output I'm not sure of the optical ...
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2 answers
986 views

S/PDIF to TTL converter

This is how S/PDIF to TTL converter usually looks like. I simulated poor quality smoothed out signal with a sine wave. Can comeone explain how it really works? Inverter with feedback resistor ...
e_asphyx's user avatar
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1 vote
2 answers
3k views

Connecting Toslink TORX179L optical receiver directly to S/PDIF coaxial input

My goal is to convert optical audio signal - Toslink - to S/PDIF coaxial input signal. The frequency is up to 96 KHz. I'm thinking about Toshiba TORX179L optical receiver. According to the datasheet, ...
Ernestas Gruodis's user avatar
1 vote
1 answer
598 views

Does any RCA connector work for S/PDIF interface?

I'd like to work with this chip : http://www.cirrus.com/cn/pubs/proDatasheet/WM8804_v4.5.pdf The S/PDIF Input mentioned in the datasheet states that the input impedance is 75Ohm. So I think that it ...
RWIN's user avatar
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1 answer
324 views

Encoder/decoder for serial connection without separate clock?

I'm putting together a link where the physical layer is SPDIF transmitters and receivers. I control both sides of the link (ie it doesn't have to interoperate with any other equipment). I would like ...
Alex I's user avatar
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