Electrical Engineering

Questions tagged [audio-codec]

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WM8960 on Pi detected but not working

I am trying to create custom board with WM8960 IC with Raspberry Pi. I am able to use Wolfson drivers for pi to detect the IC via I2C but I am not able to play or record any audio. This is the ...
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0answers
28 views

Difference in output between digital codec and analog filter

I'm working on a project which deals with filtering audio signals with a Low Pass Filter and amplifying the output. Currently, we are solving this using the TLV320AIC3111 audio codec by Texas ...
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1answer
29 views

Audio codec output detection

I am looking for guidance on audio functionality test over USB audio codec. This audio output serves as Alarm to indicate certain events. The signal flow is ARM processor USB port --> USB Codec --> ...
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1answer
119 views

I2S to PDM Conversion

We are looking to use the TLV320AIC3111 audio codec to process some sound data that we are receiving from MP34DT05-A microphone. We then look to transmit the data wirelessly over BLE using the BlueNRG-...
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0answers
31 views

How to ground a codec (TLV320AIC3105)

I'm trying to design a board with an audio codec. All signal connections seem to be pretty straightforward, but I have a major trouble with ground. I belive there are at least 3 contradicting ...
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1answer
106 views

ESD protection diodes on audio inputs / outputs?

I'm building a digital audio device with 1/4" stereo in and outputs that connect to a CS4272 codec. I'm wondering if and where I should place esd protection diodes. Pictured below is the analog part ...
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1answer
63 views

Need help understanding how this decoder IC & differential amplifier circuit works

I need help to better understand differential amplifiers, when interfaced with an decoder IC. For the circuit below, which is from the reference design here: It shows a mono differential amplifier (...
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4answers
799 views

Is there an efficient way for synchronising audio events real-time with LEDs using an MCU?

I'm working on a project in which LED lights synchronise with audio events. I'm not referring to reactive LED projects that read the ADC from audio amplitude or spectrum, but about having some ...
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1answer
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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0answers
46 views

Powering audio codec below recommended spec

I'm working on an audio project where I intend to use the PCM3060 audio codec (datasheet here). The datasheet says that the chip takes two power inputs : Vcc (Analog supply voltage) @ nominal 5V (...
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3answers
1k views

I2S TDM channels maximum bandwidth

Does I2S support sending multiple mic (around 20) channel data? If no, what is the limiting factor in supporting multiple mics? Also, is there any way to send multiple channel data from different ...
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1answer
183 views

I2S Clock in Audio Codec on dev board, how is this working?

I'm using a dev board, the keil mcb4300. In the schematic, the audio codec UDA1380HN has the BCKI going to the SYSCLOCK. According to the codec data sheet: BCKI: bit clock input SYSCLOCK: system ...
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52 views

what's wrong with my codec's op amp output?

There's some thing wrong with my audio codec. Unlike the modern codec, its input gain is configured externally with op amp's resistor. However with unity gain, I see strange wave form on the input ...
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1answer
280 views

MICBias Ground in audio codec

MICBias is the voltage required for microphone to power and record signal at full levels. What will happen if we ground MICBias, is it means we are disabling microphone.
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1answer
7k views

Why Bluetooth audio works at so high latency?

Referring to this, the lowest latencies achieved in Bluetooth audio streaming are around 30-40ms. But given the fact that Bluetooth physical layer data rate is of around 2-3 Mbps and today's Bluetooth ...
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1answer
146 views

Is the sound of an aux-connector DAC or CODEC?

I am planning to take the audio aux signal of a raspberry pi and amplify it with a TPA2012D2 by Texas Instruments. In the datasheet there is a typical application circuit, which would match my needs (...
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1answer
436 views

Using AC97 codec with Arduino or STM32

I'm an electronics student, advanced in some matters, beginner in others. I'm researching about building a board for digital audio processing. The idea is to get it work on the cheapest way. For that ...
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1answer
233 views

Ultra low power audio recorder

I'm trying to design an ultra low power audio recorder, in order to monitor ground noise in rural areas. The circuit I'm working on is based on a microcontroller (STM32L100RC) and an audio codec (...
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1answer
139 views

Please help me identify this noise on my ADC

I have a CS4270 codec hooked up to a Raspberry Pi more or less according to the "recommended layout" in the datasheet (P7), shown below. This device sinks power from three different places (VA = power ...
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679 views

I2S Connections - MEMS Digital Microphone, CODEC, and Raspberry Pi Zero W

I have a MEMS Digital Microphone with PDM output. I am planning to use this: http://www.st.com/content/ccc/resource/technical/document/datasheet/57/af/88/31/7b/59/4f/77/DM00111225.pdf/files/...
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1answer
461 views

Biasing analog MEMS microphone [closed]

I am using a analog type MEMS microphone.(SMA120). Interface chip PCM2912 provi SMA100 data sheet PCM2912a data sheet PCM2912 product page not for new designs Could you kindly suggest me a proper ...
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0answers
158 views

Driving 8 ohm headphones with DAC [duplicate]

I have stereo differential (meaning each left and right speaker have 2 wires) headphones. The specs say that impedance of headphones is 8 ohms. I need to drive this headphones with a dac with built-in ...
2
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1answer
95 views

Is it 'normal' to use a DSP's internal timers to generate lower speed clock signals for audio codec sampling?

I'm currently working on a project that features a Blackfin BF592 processor (datasheet). I'm trying to interface this DSP with a stereo audio codec (datasheet). Originally, I assumed that this audio ...