Questions tagged [audio-codec]

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1answer
33 views

Loopback Latency of an Audio CODEC?

I'm thinking way ahead about a possible future project which will contain, among many other things, a "DIY hearing aid" of sorts. Microphones feeding earbuds with some DSP in between, all ...
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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 ...
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1answer
29 views

How to access I2S pins of Lara R211 on the EVK-R2xx board

I just received the EVK-R2xx board from u blox. I need to access the i2S pins on the Lara R211 on this board in order to connect it to a beaglebone black so that I can use the audio directly from the ...
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0answers
86 views

SAI in STM32F4 behaves strange

So I'm trying to connect CS4270 codec to STM32F446RE. I managed to drive DAC part using SAI sublock B, but when I enable sublock A for receiving the sent data becomes corrupted (instead of L R L R on ...
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1answer
57 views

CS4270 doesn't respond to I2C commands

I connected CS4270 to my ST32F446 nucleo board. Currently only I2C pins are connected, GND, AGND, all 3 power lines and address select pins. AD0,AD1 and AD2 are connected to GND. (the thing I don't ...
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1answer
81 views

Problems interfacing PMODI2S2 with STM32H7

Back at it again, however this time not sure what the problem is. I have a PMODI2S2 device that is an Audio codec. It interfaces with the STM32H753ZI Microcontroller VIA SPI/I2S. The problem that is ...
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2answers
73 views

Audio Demos on DE10 Standard not Working

I bought the Terasic DE10 Standard and am having issues trying to run the demos related to audio. I am trying to run the two demos, DE10_Standard_Audio, and DE10_Standard_i2sound, while connecting ...
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0answers
879 views

How to connect 5 colored wire headphone to 3.5 TRS jack?

I have a somictone headphone and I want to repair its headphone jack, It contains five colored wires. Here are the wire and TRS jack. Please give me a feedback Can you please tell me how to wire this?...
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0answers
39 views

How to choose between different equivalent PLL/divider configurations?

If there are multiple ways to get the required clocks for a given CODEC, how do you choose between them? For example, if a CODEC can accept 64fs, 128fs, 256fs, and has an internal PLL that can ...
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0answers
32 views

Wireless Audio transmission (single TX -> single RX): Clock synchronisation/recovery

I am searching for a way to stream an audio signal to a single speaker in the living room. (I do NOT need brodcast to multiple receivers / multiroom) Audio quality is a major concern, since the ...
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 ...
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0answers
260 views

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
36 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 ...
1
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1answer
46 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
284 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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1answer
526 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
90 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 (...
4
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4answers
824 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 ...
0
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1answer
83 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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0answers
48 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
2k 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 ...
1
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1answer
261 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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0answers
69 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 ...
0
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1answer
686 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.
5
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1answer
9k 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 ...
1
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1answer
242 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 (...
1
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1answer
596 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 ...
4
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1answer
400 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 (...
1
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1answer
177 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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0answers
935 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
662 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
228 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
109 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 ...