What I need is that my audio input from microphone is: Mono 16bit 16000Hz.
I am on a Windows 8.1 PC and i am aware that you can adjust it on the advanced
settings of microphone.
(Right click on speaker icon in task-bar -> Recording devices -> Properties -> Advanced)
But there is no option for the specific setting i need. An apropriate setting would be tape recorder quality. But i only have CD,DVD and Studioquality.
I found many hints on how to resample a file but i depend on live audio from a microphone. I tried both, internal and external microphones.
I am using a voice recognition program (CMU Sphinx).
It seems that my bad recognition results depend on a incorrectly configured
microphone.
I already searched for solutions in the Forum of the speech recognition program but my problem seems to depend more general.
Pocketsphinx sets the sample rate for recording itself based on samprate option (default 16000), the issue might be that your driver does not support that rate. In that case you can start pocketsphinx_continuos with other sample rate, for example:
pocketsphinx_continuous -inmic yes -samprate 44100 -nfft 2048
In case this does not work you need to share audio dump files. You can collect them by running pocketsphinx with -rawlogdir option:
pocketsphinx_continuous -inmic yes -rawlogdir . -samprate 44100 -nfft 2048
Related
I'm trying to tap the currently selected output audio device on macOS, so I basically have a pass through listener that can monitor the audio stream currently being output without affecting it.
I want to copy this data to a ring buffer in real time so I can operate on it separately.
The combination of Apple docs and (outdated?) SO answers are confusing as to whether I need to write a hacky kernel extension, can utilise CoreAudio for this, or need to interface with the HAL?
I would like to work in Swift if possible.
Many thanks
(ps. I had been looking at this and this)
I don't know about kernel extensions - their use of special "call us" signing certificates or the necessity of turning off SIP discourages casual exploration.
However you can use a combination of CoreAudio and HAL AudioServer plugins to do what you want, and you don't even need to write the plugin yourself, there are several open source versions to choose from.
CoreAudio doesn't give you a way to record from (or "tap") output devices - you can only record from input devices, so the way to get around this is to create a virtual "pass through" device (AudioServerPlugin), not associated with any hardware, that copies output through to input and then set this pass through device as default output and record from its input. I've done this using open source AudioServer Plugins like BackgroundMusic and BlackHole [TODO: add more].
To tap/record from the resulting device you can simply add an AudioDeviceIOProc callback to it or set the device as the kAudioOutputUnitProperty_CurrentDevice of an kAudioUnitSubType_HALOutput AudioUnit
There are two problems with the above virtual pass through device approach:
you can't your hear output anymore, because it's being consumed by the pass through device
changing default output device will switch away from your device and the tap will fall silent.
If 1. is a problem, then a simple is to create a Multi-Output device containing the pass through device and a real output device (see screenshot) & set this as the default output device. Volume controls stop working, but you can still change the real output device's volume in Audio MIDI Setup.app.
For 2. you can add a listener to the default output device and update the multi-output device above when it changes.
You can do most of the above in swift, although for ringbuffer-stowing from the buffer delivery callbacks you'll have to use C or some other language that can respect the realtime audio rules (no locks, no memory allocation, etc). You could maybe try AVAudioEngine to do the tap, but IIRC changing input device is a vale of tears.
I trying capturing the image in video mode from Canon Digital Camera IXUS 75 model using WIA type. But I didn't get any thing. If Photo mode, I can seen digital Camera storage data i.e., video,photos etc. So, is it required any .dll file or any stuff for capturing image in video mode. Even I tried different way's also
Using JavaCV.It detects Webcam,Laptop internal Camera.But it doesn't detect digital Camera device.
JTWAIN is not supported with windows 64-bit OS. So, I didn't tried with this.
Please help me. Either Canon digital camera software nor Java relevant stuff.
Assuming you still plan to use Java and if the problem is still an issue, I used Asprise's JTwain to get image from scanner, camera (not only laptop web cam) and etc. The only thing you need are the drivers for the devices. Grab an eval version from Asprise and check this step by step dev guide here. As far as I understood, this should be good enough for your requirements.
By the way, seeing the file structure of a camera does not always mean you have the device fully working.
I have Windows 7 64 Bit Professional Edition on a computer I built myself so there is no manufacturer to ask. I am using an on-board sound card which has 7.1 and Optical outputs. The optical output is plugged into a Denon amp which controls the speakers.
I have got a speaker system plugged into my computer through the optical port on my sound card. When I use standard windows drivers I only get stereo output so I installed the Realtek HD audio driver. This gives me surround sound successfully however it does not tie this as a standard speaker so when I plug in headphones and define them as headphones nothing happens the audio still goes to the speaker system and nothing to the headphones.
I have discovered that if I disable the Digital output device in the playback devices list the audio is automatically rerouted through the headphones. Therefore I have been trying to find a way of disabling or enabling this device. I have a programmable keyboard so I can map a program or script to a spare key therefore I am trying to write a program to check if the device is enabled or disabled then change this to whatever it is not i.e. if on turn off and if off turn on.
I attempted to locate the hardware IDs which are1. "HDAUDIO\FUNC_01&VEN_10EC&DEV_0888&SUBSYS_105BA601"2. "HDAUDIO\FUNC_01&VEN_10EC&DEV_0888&SUBSYS_105BA601&REV_1000"
I had planned to create a batch script using devcon (the command line alternative to device manager.) using the below code to disable or enable the device
devcon disable "HDAUDIO\FUNC_01&VEN_10EC&DEV_0888&SUBSYS_105BA601*"devcon enable "HDAUDIO\FUNC_01&VEN_10EC&DEV_0888&SUBSYS_105BA601*"
However devcon fails to disable these devices as the optical connection is on the sound card and I can only disable the entire sound card which would also disable the headphones.
I am a little lost as to what to do now and I really don't want my brother to need to play with disabling devices.
I am open to any suggestions. I am happy to use any language to do this. Im sure there must be a way of doing this from c but I have been unable to locate any information on this. I would appreciate any suggestions. I am quite happy to write the program myself but if someone could at least point me in the right direction to an api or something like devcon or some way in some language to do this. I currently know VB6, VB.NET, VB Script, Java and Batch Scripting and Powershell quite well and have some knowledge of C, C++ and C#.NET.
any and all help would be appreciated
Kind RegardsDexter
You can try with this :
devcon /r disable #"HDAUDIO\FUNC_01&VEN_10EC&DEV_0888&SUBSYS_105BA601*"
devcon /r enable #"HDAUDIO\FUNC_01&VEN_10EC&DEV_0888&SUBSYS_105BA601*"
Regards,
Pal
I'm looking to control a mains powered light from a simple relay switch connected via USB to the computer.
The relay switch isn't even a USB device, it's just a simple switch that requires the USB voltage to turn it on. When the voltage drops below a threshold, the switch will turn the light off.
My problem is that I can't control the power output of a USB port. I'm happy to do it using any language on Windows or Linux (but preferably Java because I'm used to it).
Unfortunately, in most cases you cannot control the power supply to the USB port. The power supply is usually hardwired through, and not switchable in software. You can send a reset to a USB device, but that won't work in your case.
There are a number of projects on instructables that do similar to what you describe, but unfortunately they seem to either be quite complicated or require expensive parts.
EDIT: There is actually a product currently in the news which would do want you want, but it doesn't appear to be shipping yet: http://www.pwrusb.com/
EDIT (again): Apparently you can do this with some usb hubs. This post sugggests the Linksys USB2HUB4 is one that works.
EDIT (and again): Apparently there are a number of similar questions, but there don't seem to be any more useful answers:
https://stackoverflow.com/questions/405269/custom-usb-device-that-disables-power-to-usb-devices-plugged-into-it
Power off an USB device in software on Windows
Is there software or code to alter USB power output
Can I write a program that swiches USB on/off
Most of the USB to Serial or USB to RS232 $10 converters support hardware handshaking. Use one of those as a single channel digital io.
Connect your transistor that will drive the relay to DTR on the converter board and command DTR ON/OFF with the converters driver.
A 2N7002 is a good transistor to use (FET actually) since it will work from 3V and doesnt need any resistors anywhere.
Here is a complete solution.
It uses an Arduino board, with a USB connection, (and Uno for example) to control the relay and combines this with pfod (Protocol for Operation Discovery) www.pfod.com.au which will let you control the board/relay from either the Arduino IDE SerialMonitor, or a terminal window (TeraTerm) or a Java program. The message protocol encloses commands in { }, think simplified html for micros, and provides numerous screens, menus, sliders, text and numeric inputs, etc. A detailed protocol spec is available
See Garage Door Remote for a detailed example, with full Arduino code and an example of controlling the relay from TeraTerm as well as the Arduino IDE SerialMonitor.
There is also an Android app, pfodApp, which will do general purpose control via bluetooth, or wifi/internet with 128 bit security. The pfodApp does all the Android stuff, you only need to code some simple strings in your Arduino code to get any menu system you want. See www.pfod.com.au for numerous examples.
You need a USB-GPIO microcontroller:
Adafruit FT232H (about $15)
Arduino Nano ATmega328 (about $7)
See this answer
I would suggest placing a separate Raspberry Pi unit with a wake-on-lan feature activated so you can ping it off and on.
You could do it by combining these two products from Pololu, for about $25:
Micro Maestro (assembled)
Basic SPDT Relay Carrier with 5VDC Relay (Assembled)
The Maestro is mainly a servo controller but you can set any of its channels to be simple digital outputs instead. The output can be controlled from the Maestro Control Center software or you can write your own software. A digital output from a Maestro is suitable to turn on the relay on the relay carrier. The relay could be powered from USB through the Maestro; I think it draws about 100 mA of current so that probably will not be a problem for most USB ports, though it would not be USB-compliant because the total current drawn by the Maestro and the relay would be over 100 mA. You could supply your own power source for the relay if you are worried about that.
hi i am developing code for gps tracker using gps module ssf1513. i don't know how to configure the gps module to power save mode , please guide me how to enter in input mode.
That board has a SiRF starIII GSC3e/LPx GPS chip.
You can Communicate with it via SiRF's binary protocol or NMEA here are links to the reference manuals for each:
SiRF NMEA Reference Manual
SiRF Binary Reference Manual
How exactly you want to save power is up to you there are tons of ways to reduce power usage with gps (duty cycle control, long sleeps, etc). This will be application dependent.
It my be that the power save mode is automatic, e.g. if you stop polling the device then it may go into power saving mode after a certain time-out, and then wake up again automatically when you start polling it again ?