I want to create an application for measuring the sound input on an iPad.
Users will have to scream into the iPad mic and a gauge will display the scream level. So I will have to get the mic volume and display the value on the gauge.
You can use the AVAudioRecorder for that. Have a look at this tutorial: Tutorial: Detecting When A User Blows Into The Mic
In Apple's documentation, focus on:
Using Audio Level Metering
meteringEnabled property
updateMeters
peakPowerForChannel:
averagePowerForChannel:
Related
I have tried every mothod in AVAudioSession almostly, but no one work.Is there a way to output through Bluetooth while keeping input through the iPhone's microphone?
I am trying to write an app in Apple Swift that monitors audio from the microphone and displays the volume level on a VU meter style graph. I know how to do it using AVAudioRecorder, but I don't want to record and save the audio, I just want to monitor and observe the volume levels, as I will be monitoring the audio for multiple hours and saving this to the phone would take up tons of space.
Can anybody lead me in the right direction as to how I can do this?
Thanks!
I do not have any code to show, as I a just looking for the right direction to go not debugging.
You can use AVCaptureSession:
add an input device (the microphone) using AVCaptureDeviceInput;
add an output AVCaptureAudioDataOutput, setting the sample buffer delegate
Once you start the session, the delegate will receive audio samples that you can process however you wish.
Don't forget to ask permission before using the AVCaptureDevice!
There is a talking cat app well known for iOS devices, in which you speak your voice and he repeats. Analyzing this app, you'll see that it stops talking when you stop talking, that is, it stops to capture the audio when not receive another voice.
I was giving a analyzing the methods of AVAudioRecorder class, and not found any method in which to capture when the User stop to talking or recorder stops to receive external audio.
How can I capture when the audio recorder stops to receiving audio.
Process the audio stream as it is coming through. You can look at the frequency and volume of the stream. From there you can determine if the user has stopped talking.
I suggest frequency and volume as the recorder still picks up background audio. If the volume drops dramatically then the sounds the recorder is picking up must be further away from the device than before. The frequency can also lend itself to:
A.) Filter out the background audio in the audio used to replay the audio with a pitch change or any other changes. etc.
B.) I do not know the limits of frequency for the average human. But this covers the use case where the user has stopped talking, but have moved the device in such a way that the recorder still picks up load shuffling from moving fingers near the mic.
I am using the audio recorder in my project,want to show audio meter when recording is on, and stop it when recording is off.i have used PCSEQ meter but it show default meter not depend on pitch level of volume.,but i want it depend on volume pitch level show high or low.So please tell me how can i do it ?
after waiting 1 day today i have work with http://code4app.net/ios/ATTabandHoldAudioRecord/52366f936803fa533b000000 and show the volume pitch level when user record audio.
thanks to developer who made it.
I want to show audio meter levels in my app from the audio that my app send to the speaker. I can find the audio level from AVAudioPlayer but it works on audio files.
I have tried to acheive this using The Amazing Audio Engine as it is provided in its documentation here but I am unable to find out how to do that.
Is it possible to achieve this in ios? Can anyone suggest me any library, audio engine or method?
Thanks in advance
If you are using "remote i/o audio unit for handling audio input and output" this is a possibility:
https://developer.apple.com/library/ios/samplecode/aurioTouch2/Listings/ReadMe_txt.html
"… , and a sonogram view (a view displaying the frequency content of a signal over time, with the color signaling relative power, the y axis being frequency and the x as time). Tap the sonogram button to switch to a sonogram view, tap anywhere on the screen to return to the oscilloscope. Tap the FFT button to perform and display the input data after an FFT transform. Pinch in the oscilloscope view to expand and contract the scale for the x axis." …