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Questions tagged [digital-audio]

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28 views

Ground connection in audio selector and signal level sensor ICs

I'm designing a circuit that uses two ICs from New Japan Radio (NJR): NJW1110 - 9-Input 3-Output Stereo Audio Selector (https://www.njr.com/semicon/PDF/NJW1110_E.pdf) NJU7181 - Signal Level Sensor (...
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82 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.
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65 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 ...
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52 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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170 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 ...
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87 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. ...
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2answers
263 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 ...
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47 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 ...
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75 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 ...
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126 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 ...
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312 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 ...
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71 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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164 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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715 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 ...