Questions tagged [digital-audio]

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1answer
273 views

CSR8645 3.2 bluetooth module audio output merge negative pins

I want to use this module with my car aux in which is has 3.5mm 3 pole jack. This module has separate negative pins as LN and RN. I need to merge and connect these pins to aux in common negative pin.
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1answer
45 views

DC filtering for digital audio amplifiers

I am working with digital amplifiers and from what I can see there is a DC blocking filter that is placed at the start of the signal chain. Why is this DC filter placed at the start of the signal ...
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2answers
66 views

analog vs digital automatic level control

In an analog broadcast audio chain, an automatic gain control (AGC) or compressor is employed to maintain a nearly constant average audio level fed to the over-the-air transmitter. In a digital audio ...
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0answers
27 views

Dependence of the PWM amplitude of the amplifier on the battery voltage

I'm going to use speaker connected to internal Class D amplifier in WM8998 in my PCB. Power source of my PCB is Li-Pol battery with 3.2-4.1V range or external 4V adapter. Audio codec speaker power ...
0
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1answer
59 views

What would be the best, cheapest, smallest way to power a Bluetooth bone conduction headset project?

Please, be forewarned, I'm an idiot when it comes to electronic builds. The last thing I soldered was a pick-up in a guitar kit I built, and the thing still isn't grounded right. I'm trying to build a ...
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0answers
39 views

Would an LM7805 need a heatsink stepping down two stacked LiR2032/CR2032 (3.6V X2) batteries?

Okay, I'm terrible at anything electronic, especially when it comes to building from boards (think rudimentary understanding). I've built a few PC's in my day, but piecemeal, not from scratch. Keep ...
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1answer
45 views

alternative values of these resistor in circuit?

i am working on a spectrum analyzer, concept is to feed audio signal to esp32 and perform FFT at 40000hz sampling rate. I tried MIC input but did not get satisfied by results. link to diagram I found ...
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0answers
57 views

Transmitting I2S over 6ft

I've been looking at audio ADCs with most rated at 192Ksps with 24 bit audio. Typically the output is in I2S, but I understand that the signal is not intended to go far. I understand that HDMI can ...
0
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1answer
114 views

Impedance matching between CSR8675 and a MM20 microphone

I'm building my own (rugged) headphone. I am planning to use a MM20-33639-000 microphone with CSR8675 DSP. My question here relates to impedance matching. Based on what I have read, most modern ...
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3answers
141 views

Noisy AES audio signal in studio installation

This is a question about digital audio cables. I know this isn't an audio engineering forum but the question's specific to the physical connections and there's limited info online which I can find ...
4
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1answer
166 views

The relationship between bit depth and SNR in ADC

An 8-bit audio signal has a theoretical maximum SNR of 48.16 dB (20log(2^8)). My question then would be, does this work in reverse, i.e. would an analogue audio (or video) signal with an SNR of <=...
2
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1answer
378 views

How can I convert an audio PDM bitstream into analog form?

I have collected PDM bitstreams from MEMS microphones and I'm looking to convert them into analogue form. Does anyone know some practical implementation details on how to do this (beyond a quote from ...
0
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1answer
189 views

I2S between multiple devices

I am trying to design an audio amplifier based on a digital input chip (TAS6424-Q1 for example) with two, stereo, I2S enabled sources for the input (for example the BM83 Bluetooth module and the ...
1
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1answer
66 views

Is it relatively simple to design an ADC to ADAT interface with only a Toslink port?

For this project (I'm an experienced audio engineer but a relative beginner in electrical engineering) I really want to integrate a simple ADC to ADAT circuit in a patchbay I'm building so that I have ...
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0answers
25 views

How to set up SPIDF channel bits for high sample rate output?

The original SPIDF standard supported sampling rates only up to 48kHz, but today much higher sample rates are supported. The sample rate was set by controlling channel status bits, which also ...
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3answers
243 views

Merging two different HDMI cables

I have two brands of broken HDMI cables that I need to join to make them longer. Can't join them by color, because they are completely different. Plus, one of the cables has all the wires, the other ...
1
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1answer
81 views

Overheating Linear Voltage Regulator In Lexicon Omega Audio Interface. Can I Swap With Reduced Amperage To Avoid Heat Probs?

I have a Lexicon Omega USB Audio Interface that's overheating. Already tried several heatsinks, including the biggest one I could get (6"Hx2.5"Wx.5"D) with optimized cross-cut vertical fins, mica ...
0
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2answers
49 views

Can we get higher internet speeds even with low BW message signals?

Consider a case where i’m listening to a recorded audio on internet.Basically the useful audio Frequency range lies b/w 40hz to 4khz, which has a BW of 4khz which is pretty low ,does that mean the ...
1
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1answer
2k views

How to interface to a PDM audio source?

I hear about this technology, I read about it, I even see a bunch of MEMS microphones with PDM output. I can perfectly understand how it works (I have worked with DSP). However, I can't seem to ...
0
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2answers
386 views

How to play music on PAM8610 with ESP32?

I'm trying to use Xtronical's DAC audio library on an ESP32 to run 10W speakers. The board that Xtronical used is a PAM8403 which has a signal voltage range of -0.3V to +0.3V but as it can only run 3W ...
1
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1answer
133 views

How to interface a microphone to an I2S input to use HFP

For my group's SDP/Capstone we are doing a bluetooth headset of sorts. We are using a CYW20706 SoC from Cypress. Specifically, we are using a this CYBT-343026-01 Cypress module whch includes that ...
0
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1answer
355 views

AUX input or microcontroller in a musical tesla coil?

Alright so I am making a musical tesla coil. I have seen some online tutorials and what I noticed is that some people are giving the audio input using a microcontroller and programming it to produce ...
0
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1answer
98 views

What type of audio output does this symbol represent?

I have this picture. I want left, left ground, right and right ground output. Pin. But I can't understand it. Can somebody please help me. Thanks.
0
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1answer
257 views

Low latency digital wireless audio transceivers

I would like to start a project developing diy low latency digital audio transmitters. Issue is there is not much information online and I'm unsure where to start. I live in England UK, I would like ...
1
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3answers
985 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 ...
2
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2answers
162 views

How to analysis this Operational-Amplifier circuit?

This is a reference buffer circuit that make a single-end audio input to be the differential inputs for ADC. Circuit-1: It does not like typical Op-Amp circuit of the same purpose like below. ...
1
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2answers
827 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 ...
0
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1answer
101 views

SQNR and Dynamic Range

An audio tone \$Acos(\omega t + \theta)\$ undergoes uniform quantization by a quantizer that has the average quantization noise power \$q^2/6\$ joules, where \$q\$ is the quantization step size. If ...
0
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1answer
82 views

Translating/reverse engineering firmware commands

I'm trying to build my own Hi-Fi system. So, I recently ordered this Japanese DSP that's able to process Dolby audio. I was all excited until the part had arrived and I found something in the ...
1
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1answer
253 views

Understanding Audio Amplification with OpAmp

I have what I believe to be a fairly simple schematic, as shown below, to take either a PWM signal from an AVR board to play a song/alarm, or radio signal. I'm connecting both of these with a ...
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0answers
526 views

I2S DAC Volume Control

First of all, let me preface this with the fact that I'm not an EE -- I'm a hobbyist with some experience and a background in software development. I'm trying to use a TI PCM5102A Audio DAC with a ...