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327 Threads found on edaboard.com: Sound Audio
The circuit shown in Figure 1 is a low-cost, high-performance soundBAR system that accepts analog stereo audio as input and outputs up to 8 channels of audio and processes each channel individually. The circuit is ideal for small expansion sockets and portable media devices. The circuit has low power consumption and high efficiency, does not (...)
The datasheet for the Yamaha Av 80 Y IC says it produces high quality voice sounds but the detailed spec's show poor telephone quality. It might be used in kid's toys and answering machines.
Theoretically, you SHOULD be able to calculate what your fedback signal will sound like, but there are, imo, just too many variables to really do it. Phase, reflections, harmonics, time and frequency response of each element in the system etc., etc., just make this a formidable task. But, if you listen to Jimi Hendrix ( among other, lesser, playe
Hi, I bought an aubtm23 chip and I want to use it to act as a bluetooth transmitter, i.e. to receive sound from microphone port and send it via bluetooth to a bluetooth speaker or handsfree. May you please guide me to make it? Thanks in advance
Please I am new in signal processing. I want to know the criteria to detect / recognize environmental sound in an audio signal. I have the codes for the extraction techiqiues I want to know already, but I want to know how to use them (Gammatone Cepstral Coefficient and Matching Pursuit ) feature extraction techniques for the detection
"Optimum performance" of an audio amplifier is not maximum output amplitude and awful sounds. A modern audio amplifier has a specification called "Damping Factor". A good damping factor damps resonances of a speaker so it does not ring like an old sound system did or like a bongo drum. Many good audio (...)
* Look closely at every brass contact surface. Did any of them become bent so it no longer makes contact? I found one like that on my 'bargain' HDMI cable. * Do you have something plugged into your laptop's headphone jacks? That might turn off the HDMI sound. * My laptop has 2 headphone jacks. One only works with headphones, the other only wi
Hello everyone. I made a small circuit to be able to test some experience with signal processing. Basimente I do input audio (with its analog circuit) using a STM32 (STM32F030) I digitize the signal and generate a PWM. This PWM passes through a low pass filter and is then delivered to a small audio amplifier (TPA6205A). In this direct soun
Hi, I am working on a car project. Basically, I need to be able to control the volume of the radio (a knob/pentiometer system I think) with two push buttons: one for up, one for down. I am still relatively new to electronics and have no idea where to start, without causing the volume to be dependent upon both switch systems. They need to be indepen
Hi. I'm making a sound level alarm, a simple device that will turn on a light if the sound level is above a certain level. For this I would like it to have the ability to be really sensitive, but I'm not sure how to achieve that. Right now I'm using one of those cheap through hole electret mics with an LMV358 op-amp, but there's a limit to how much
I need some advice on how I might accomplish the detection of very high frequency sound. I do not know the source of the sound, or where is comes from (sorry - I don't care and can't answer any questions about that). I also do not know the exact frequency - or range. I know it is higher then what I can hear, so perhaps 20 - 50 khz . I
It has DSP board with audio amplifier for surround sound amplification.Many embedded systems use DSPs. It is mentioned that audio systems are embedded. Any inputs..??
Your schematic shows a capacitor with a value of only 47uF feeding an 8 ohm speaker. Then it cuts all low frequencies below 426Hz. Do you like tinny sound with no bass? Your schematic does not show a volume control. Add it to the schematic so we can show you how it messes up the input biasing without additional coupling capacitors.
Your tiny speakers might sound like tweeters but they have a voice coil that is about 3 ohms so the 470uF output capacitors should charge or discharge in about 0.07 seconds. Do the tiny speakers have other capacitors in series?
For voice it is adequate to have 4k to 8k samples per second. (I think I once heard 8k is a speed used for audio streaming over the internet.) Hence if you wish to store 10 seconds of sound, you'll need 40k to 80k bytes. 256 possible data values is satisfactory. This is convenient to have one byte per sample. 5-bit DAC playback... There is a cha
Hello everyone. I'm looking for the Texas Instruments and Analog Devices DSP sound libraries for audio. Can someone help me to find the source files or the list of the procedures available? Thank you. :smile:
I built custom one-of-a-kind audio circuits for companies who did not care much about cost as long as it worked well. Did I tell you about the crazy spec's (high fidelity sound on a huge intercom system) for the government's new airport sound system where my idea with the company I worked for were the only bidder and we got the job? I tried (...)
I agree that a modern IC power amplifier will work better than the Mosfet amplifier. R17 ruins the damping factor and makes it sound like a boomy old vacuum tubes amplifier.
Hi, I would like to dedicate a PC (x86) to run EQSO software (windows 2000 and newer) to make an RF gateway. The PC will run the software and it will route the audio input from the sound blaster to the IP and reverse. If you are familiar this is what ecolink does, connect RF devices through the internet. For power and size reasons, I do not want t
- Designed with Tripath TA2022 class-D hifi auido amplifier - NE5532 preamplifier - Fully short circuit and thermal protection - On board rectifier bridge, AC powered - Dual AC 22-24V + single AC 6-9V - uPC1237 protecting, no click sound when power on and off - 100% HiFi capacitors - Board size: 100mm x 150mm
Description This is a simple hybrid tube (6N8P/6SN7) + MOSFET design. The sound is great although the circuit is very simple. 6N8P troid forms SRPP circuit to drive MOSFET class-A voltage follower. Total harmonic distortion is only 0.08% @1KHz 1W on 8Ohm load. This is a kit that offers tube sound at solid state price. Features - 6N8P/6SN7 SRPP
Hello everyone, i am facing an issue with my laptop it lost its sound hardware. i opened up the laptop and found a blown SMD transistor (transistor because on board number mentions as Q3504 ). Now i cant read the number written on it to determine the type rest of the transistors on this I/O board are K72s probably 2N7002 FETs in So23 packaging. I
Hello I found a Matlab code here and modified it a bit. It simply takes three signals with different frequencies (nots C G and E) and inputs these three signals into one signal at a 4th frequency. %% configure signal set
I would suggest a crystal microphone feeding a transistor amplifier with the choice of CE, CB, CC input stages. the sound quality should be memorable! The main claim to fame of a CB amp is its frequency response and linearity. Perhaps the experiment could be repeated with a ultra low impedance micro phone ( ribbon? ). Or using an audio type transi
How can you separate noise from speech when they have the same frequencies?? Maybe you use a highpass filter to cut lows then adult men sound like chipmunks. Then you use a lowpass filter to cut all high audio frequencies removing all the important consonant and sibilant sounds of speech making the speech difficult to understand?
Hi, recently I decided to add an auxiliary input to my old Sony CFD-S47L radio. I have connected an 3.5mm female audio jack to the TA2068N. The inputs on the TA2068N coming from the tape deck gave my some very bad sound, so I decided to use the ones from the CD (pins 14 and 24). When usin
The TDA12553 amplifier IC is very old and has not been made or available for a long time. Most other amplifier ICs for car radios are also very old and have not been made or available for a long time. Buy cheap Chinese fake amplifier ICs from ebay. I haven't played with surround sound for many years. The front speakers on my car radio play the sam
The main thing you can get wrong that will sound a bit odd is to have the left and right channel out of phase, ie one loudspeaker is pushing the air when the other is pulling the air. If the loudspeakers are widely spaced people don't notice. If you use two different models of FM receiver there is a chance of the outputs being out of phase with ev
The "presence" control on the original old amplifier boosted midrange frequencies that caused the output to sound like a telephone with reduced bass and reduced highs.
Noise is audio frequencies. The sound you want to listen to is also audio frequencies. If you filter out the noise frequencies then you also filter out the sound frequencies you want, then you hear NOTHING! Maybe you should explain the problem you have where the sound is not clear. Is it distortion? Also (...)
Most multimeters are made to measure voltages of only 50Hz and 60Hz from the mains accurately. At higher audio frequencies the measurement is low or zero. A sound card should measure and play up to 20kHz accurately.
Hi everyone. I have changed the 100uF capacitor wich is in connection with pin#3 of the audio IC YD1517P.(see the datasheet link above) I have changed the IC too. But despite my effort,still no sound. Any clue? Regarding my post#5 what is the voltage on pin 8 and all other pins for that matter..
Your amplifier will not work properly because it has no negative feedback from its output to inverting input pin 2 like EVERY circuit shown in its datasheet. Also your circuit is missing an input coupling capacitor. If you use a differential amplifier to hear a stereo sound then there will be an output ONLY when the two channels sound different.
Hello, I'm working on a project that involves multiple oscillators (7), with different frequencies, amplitudes and phases at different times, going out through a single channel audio output. This is for a sound Art installation, and for the sake of visual and startup simplicity, I would like to get rid of the computer. I wonder how possible is t
C1 can be 1uF for telephone sound quality without much bass sounds or it can be 33uF for deep bass sounds to be passed, or any capacitance value in between. This capacitor does not create anything, instead it passes the audio signal but blocks the DC. The audio source is probably 0VDC and the base of the (...)
Why not build an electronic VU meter. Its what is used in American sound studios to set their output levels. Frank
I want to build a box which monitors certain levels in our office, I am having problems with getting the sound level monitoring. I have purchase a couple of Arduino microphone boards. but the sounds level voltage is quite low and looking at an LM386 amplifier. I have done a lot of searching on the net and seem to be going around in circles on a sui
Hi everybody, I want to transmit high quality sound (not only speech, especially music) over UHF radio. In my country, bandwidth is limited (12.5kHz) because of goverment rules. I found an UHF radio modem that uses 64-QAM modulation achieves bitrate of 60 kbps in 12.5 kHz; 120 kbps in 25.0 kHz bandwith. I want to ask you, is there any low c
The sound quality in your video is AWFUL! It is full of echoes and is very boomy. I could not understand anything that you said. It also sounds like the audio gain is jumping up and down. You showed a picture of a transistor driving an LED with NOTHING limiting the current.
Doesn't sound reasonable at all. You probably misunderstood the purpose of the circuit. You would neither make a voltage divider from a loudspeaker and a resistor. Loudspeakers are directly driven from audio power amplifiers with fitting parameters (impedance, power). Exceptionally, low power loudspeakers, more often headphones are operated with
yes, it is very easy because the machine can do it for you. Anyway, interesting application. How is the sound compare to differential opamps? why don't you use opa2134 that is very common audio codec output driver. I design it many years ago, and it is the first time I heard that someone use it in audio except myself. hahahaha................
Read the specs. Write the code. Enjoy your beautiful sound.
It sounds like the problem is the earphone ground has an intermitent connection. Normally in a headset there are two wires from each earphone to the jack, one from each is ground, the other from each carries the audio. If the ground becomes disconnected instead of each ear hearing the sound it's supposed to, they both hear only the (...)
Hello, I would like to connect audio signal from pc sound card to SIM900 GSM module. I am using simple breakout board from Itead studio, I connected the grounds together and signal form sound card to board input. Only thing that I can hear is noise. If I connect microphone I am able to hear sound. Can somebody help me (...)
Don't know about Octave, but there are several utility programs for capturing incoming audio. They digitize the sound and save it as wav or other format. If you're interested in free digital sound processing programs... A popular one is Audacity (available for Mac or Windows). It will record whatever you select as your input device (...)
Hello, there has been something bothering me for years but never tried to find out. It is about the 5.1 audio output on the motherboard. Today I wondered how to listen from all the outputs, since only the green jack plays sound, all the others are muted. So, I ask you, do I need special software to make them work ? Suggest me Please a way t
Hello, In the audio processing field, after applying fft on a sound signal, sometimes, engineers use 10*log10(abs(value)) and some others just sqrt(i**2 + j**2) to get the amplitude of frequencies. Why one instead of the other ? Thanks, Larry
Hi geeks, My application need to sense around six wave forms from six small condenser microphones(placed in different angles).The output from these mics will go to to ADCs of microcontroller. When a sound hit on these microphones,microcontroller must recognize on which mic did the sound hit first then second,third etc..concurrently i must run a
some PA systems will sense the ambient sound level and automatically adjust the volume so it is above the background sound level so you might look at the circuit blocks they use. I would surmiss it is a sample and hold circuit feeding a DC controlled voltage amp
From a good loudspeaker, white noise sounds very shrill because it is mostly high audio frequencies. Pink noise sounds more pleasing because the high frequencies are reduced by 3dB per octave, something like interstation noise heard on an FM radio (where de-emphasis cuts the high frequencies). When I worked with a few office (...)