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 (...)
Business, Promotions, Advertising :: 02-07-2017 04:01 :: sandyli :: Replies: 0 :: Views: 855
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.
Analog Circuit Design :: 02-05-2017 01:40 :: Audioguru :: Replies: 6 :: Views: 638
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
Miscellaneous Engineering :: 02-03-2017 17:49 :: barry :: Replies: 2 :: Views: 2888
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
Microcontrollers :: 12-28-2016 16:18 :: 8631060 :: Replies: 0 :: Views: 432
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
Digital Signal Processing :: 11-01-2016 23:15 :: Aruorezi :: Replies: 10 :: Views: 774
"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 (...)
Analog Circuit Design :: 09-20-2016 17:16 :: Audioguru :: Replies: 15 :: Views: 1038
* 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
PC Programming and Interfacing :: 09-10-2016 05:51 :: BradtheRad :: Replies: 4 :: Views: 966
I suggest you record and FFT your power supply noise, then replace mic with a resistor then use a sine signal from a sig generator and compare results.
8 bit PWM will be quite poor for sound quality. It should be a sigma delta type.
Digital Signal Processing :: 09-03-2016 18:28 :: SunnySkyguy :: Replies: 19 :: Views: 1016
It's not clear to me which part of the "car project" you want to design. In case you are using off-the-shelf car audio components, which control interfaces you intend to use?
Be sure that recent car radios and car audio systems are using digital control for everything, e.g. the sound level. So it can be basically remote controlled through (...)
Hobby Circuits and Small Projects Problems :: 07-30-2016 15:19 :: FvM :: Replies: 7 :: Views: 690
I agree that the LMV358 is VERY noisy, look at its datasheet. Use a low noise opamp designed for audio instead.
Have you 'scope'd or listened to the output of your circuit? It might have 50Hz or 60Hz mains hum caused by poor wiring and not have rumbling or hiss caused by the mic or the opamp.
I have a sound level meter in my living room that is ex
Analog Circuit Design :: 07-12-2016 12:34 :: Audioguru :: Replies: 23 :: Views: 1450
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 >.
Microcontrollers :: 07-01-2016 07:41 :: dxpwny :: Replies: 2 :: Views: 2615
It has DSP board with audio amplifier for surround sound amplification.Many embedded systems use DSPs.
It is mentioned that audio systems are embedded.
Elementary Electronic Questions :: 06-11-2016 19:00 :: shroff_rushi :: Replies: 1 :: Views: 460
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.
Analog Circuit Design :: 04-04-2016 17:44 :: Audioguru :: Replies: 3 :: Views: 602
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?
Analog Circuit Design :: 03-25-2016 17:31 :: Audioguru :: Replies: 34 :: Views: 2726
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
Digital Signal Processing :: 01-08-2016 17:31 :: BradtheRad :: Replies: 3 :: Views: 770
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:
Digital Signal Processing :: 12-15-2015 15:15 :: rickowens :: Replies: 0 :: Views: 462
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 (...)
Hobby Circuits and Small Projects Problems :: 11-22-2015 21:32 :: Audioguru :: Replies: 4 :: Views: 507
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.
Analog Circuit Design :: 11-02-2015 13:50 :: Audioguru :: Replies: 13 :: Views: 925
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
PC Programming and Interfacing :: 10-02-2015 13:51 :: neazoi :: Replies: 1 :: Views: 608
- 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
Business, Promotions, Advertising :: 09-22-2015 08:46 :: EzPCB-Nila :: Replies: 0 :: Views: 762
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.
- 6N8P/6SN7 SRPP
Business, Promotions, Advertising :: 09-03-2015 07:43 :: EzPCB-Nila :: Replies: 0 :: Views: 920
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
Service Manuals, Requests, Repair Tips :: 08-21-2015 11:12 :: tariq.sahi :: Replies: 0 :: Views: 544
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
Digital Signal Processing :: 08-09-2015 12:42 :: Batuhan88 :: Replies: 2 :: Views: 603
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
Elementary Electronic Questions :: 05-28-2015 19:21 :: chuckey :: Replies: 2 :: Views: 683
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?
Elementary Electronic Questions :: 05-09-2015 14:24 :: Audioguru :: Replies: 1 :: Views: 397
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).
Hobby Circuits and Small Projects Problems :: 04-04-2015 10:46 :: jure8479 :: Replies: 6 :: Views: 1332
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
Analog Circuit Design :: 03-30-2015 00:27 :: Audioguru :: Replies: 2 :: Views: 775
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
RF, Microwave, Antennas and Optics :: 02-05-2015 04:27 :: throwaway18 :: Replies: 12 :: Views: 1212
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.
Analog Circuit Design :: 01-18-2015 15:07 :: Audioguru :: Replies: 7 :: Views: 844
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?
Analog Circuit Design :: 12-15-2014 01:39 :: Audioguru :: Replies: 4 :: Views: 636
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.
PC Programming and Interfacing :: 12-12-2014 20:20 :: Audioguru :: Replies: 4 :: Views: 886
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.
Regarding my post#5 what is the voltage on pin 8 and all other pins for that matter..
Service Manuals, Requests, Repair Tips :: 11-19-2014 07:36 :: SunnySkyguy :: Replies: 8 :: Views: 1642
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.
Hobby Circuits and Small Projects Problems :: 09-08-2014 12:56 :: Audioguru :: Replies: 1 :: Views: 549
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
EDA Jobs :: 09-01-2014 18:07 :: albatriana :: Replies: 0 :: Views: 745
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 (...)
Elementary Electronic Questions :: 08-26-2014 22:07 :: Audioguru :: Replies: 6 :: Views: 726
Why not build an electronic VU meter. Its what is used in American sound studios to set their output levels.
Analog Circuit Design :: 05-13-2014 06:19 :: chuckey :: Replies: 7 :: Views: 673
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
Digital Signal Processing :: 04-06-2014 18:21 :: brendonshaw :: Replies: 1 :: Views: 771
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
RF, Microwave, Antennas and Optics :: 03-31-2014 09:05 :: crackerboy :: Replies: 4 :: Views: 1046
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.
Elementary Electronic Questions :: 03-25-2014 15:21 :: Audioguru :: Replies: 4 :: Views: 767
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
Elementary Electronic Questions :: 02-26-2014 15:19 :: FvM :: Replies: 6 :: Views: 1151
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................
Analog Circuit Design :: 02-23-2014 23:45 :: kwkam :: Replies: 6 :: Views: 1072
Read the specs.
Write the code.
Enjoy your beautiful sound.
PLD, SPLD, GAL, CPLD, FPGA Design :: 02-10-2014 17:03 :: TrickyDicky :: Replies: 1 :: Views: 897
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 (...)
General Computer :: 02-03-2014 20:45 :: betwixt :: Replies: 5 :: Views: 3079
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 (...)
Hobby Circuits and Small Projects Problems :: 01-23-2014 21:44 :: martintw :: Replies: 0 :: Views: 726
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 (...)
Digital Signal Processing :: 12-19-2013 23:24 :: BradtheRad :: Replies: 3 :: Views: 1660
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
General Computer :: 12-02-2013 16:11 :: thebadtall :: Replies: 4 :: Views: 1031
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 ?
Digital Signal Processing :: 11-18-2013 20:24 :: LarryJ :: Replies: 1 :: Views: 613
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
Microcontrollers :: 11-07-2013 06:32 :: mithun mohan :: Replies: 0 :: Views: 390
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
Analog Circuit Design :: 10-26-2013 12:25 :: kam1787 :: Replies: 2 :: Views: 460
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 (...)
Elementary Electronic Questions :: 10-15-2013 23:05 :: Audioguru :: Replies: 3 :: Views: 412