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Questions tagged [pcm]

Pulse-code modulation

0
votes
1answer
56 views

SMPS: Current Mode Instability (aka “sub-harmonic oscillation”) - Can we ignore it?

Currently I am designing a Constant Current charger for a capacitor which charges it from 0 to 350 VDC using a peak current mode controller. As we expected from simulation, I see there are sub-...
0
votes
1answer
33 views

Synchronizing an oscillator signal and a single wire signal

On some 32bit MCUs(PIC32MX, STM32F4), those SPI pins can read a continuous signal such as I2S/PCM. So I thought to read a single-wire signal that has MHz fixed frequency as SPI. First, I made a ...
0
votes
3answers
127 views

Is it possible to play music with a PIC16F628A

Is it possible to generate and send PCM audio from a PIC16 (or an arduino/atmel)? It does have an analog port, so it should work right? And if it does, is the PIC fast enough to generate the ...
0
votes
0answers
47 views

Delta modulation slope overloading

I have a question about a problem in a textbook I can't exactly solve. It goes as follow: Given a message m(t) as input to a DM system $$ m(t) = 3cos(890\pi t) - 0.7sin(1000\sqrt{3}t) $$ Determine ...
4
votes
2answers
475 views

PWM, PAM, PCM sine generation and usage confusion

I am confused about something fundamental regarding PWM, PAM and PCM. I am going to be using a speaker's driver analogy to explain my point. As far as I know motors use PWM for power input, I don't ...
1
vote
1answer
79 views

Oscilloscope trace shows two voltages at the same time

Sorry if I worded the question strangely, I'm just not exactly sure what's going on. I'm analyzing a PCM audio stream coming out of an ESP32. I've got the DOUT pin connected through a 10x probe to ...
0
votes
1answer
41 views

pcm512x charge capacitor value

First of all I'd like to say that I'm quite new in electronics (I'm a software developer) so I might be missing some basic knowledge for which I apologize. I'm trying to create a DAC using the ...
0
votes
3answers
926 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 ...
3
votes
2answers
405 views

Why is Pulse Code Modulation called 'modulation' and not 'conversion'?

Since all that a pcm accomplishes is analog to digital conversion, why is it called a modulation technique? There is a message signal but no carrier. According to my knowledge, modulation requires a ...
-1
votes
1answer
45 views

Converting pulse into volt? [duplicate]

I am working on the lab which is allowed to ask other people for hints. Below picture is part that I don't understand. In the image, program called "Audacity" is used to capture that waveform. My ...
-1
votes
1answer
54 views

Can't understand concept, range of the pulse (waveform)

I am working on the lab which is allowed to ask other people for hints. In the image, program called "Audacity" is used to capture that waveform. Question 1 In the image it says, "The peak-to-...
1
vote
0answers
250 views

Li-ion BMS/PCM Use Cases

I am building a portable bluetooth speaker. I am using 4 18650 Li-Ion batteries and using 4S 14.8v BMS/PCM charge/discharge protection board with balancing. This board works great, but the challenge ...
0
votes
2answers
88 views

Is this the correct way to use this Audio AD Converter?

I have a PCM1804 -- and I want to use it convert the stereo audio signal from RCA/SCART to a TosLink Optical output - outputting a PCM signal. I have been using ...
0
votes
1answer
382 views

What audible difference will an audio op amp make in an audio ADC

If I were making an audio ADC based upon the PCM1804 for example , what would be the impact on the output audio from the PCM1804 if I used an audio op amp like the OPA1632? What exactly does the op ...
12
votes
2answers
11k views

Audio using PWM, what is the principle behind it?

I have seen a schematic of a PIC board which uses filtered PWM to provide audio output signal to an audio jack. It shows PWM output filtered using 3 stages of passive RC filter followed by an LM386 ...
0
votes
1answer
321 views

CS4234 has two I2S data I/O lines?

I have an application where I'll be sending audio data to a codec. The CS4234 fits my needs very well, although with other I2S codecs, there have only been one data in line for the communication. The ...