thanx 4 rply... but if i turn down volume control thn will not be able to hear playbackd voice. and how to seperate mic and speaker ..
On Thu, May 26, 2011 at 3:19 PM, Ashwani Kumar <[email protected]> wrote: > When the mic can hear the speaker then there is "acoustical feedback > howling" because the sound goes around and around. > To stop the howling: > a) Turn down the gain control or volume control. > b) Separate the mic and speaker and point them away from each other. > c) Use a good speaker with a flat frequency response instead of a cheap > speaker that has a peak in its frequency response > > > On Thu, May 26, 2011 at 5:53 PM, neha <[email protected]> wrote: > >> Denial, >> >> I tried what u said,but it dint solve my problem but producing more >> echo.. >> I think its happening bcoz voice coming from speaker is also going in >> mic. >> >> If u have ny idea about it,Plz help. >> >> On May 26, 1:20 pm, Daniel Drozdzewski <[email protected]> >> wrote: >> > On Thu, May 26, 2011 at 11:59 AM, neha <[email protected]> wrote: >> > > Thanx alot 4 rply >> > > but if i use large buffer size ,it produce delay between record and >> > > play. >> > >> > Neha, >> > >> > All I suggested was to use the larger of values returned by both >> > getMinBufferSize() calls for all 3 aspects: recording, playing and >> > transfer of the data instead of arbitrary 400. >> > >> > >> > >> > >> > >> > > On May 26, 11:46 am, Daniel Drozdzewski <[email protected] >> > >> > > wrote: >> > >> Neha, >> > >> > >> Your echo comes from the fact that you are using 400 bytes buffer to >> > >> transfer the recording to the playback. >> > >> It will physically take time to fill that buffer and then process. >> > >> > >> Making the buffer much smaller might not necessarily work either, as >> > >> it will mean more overhead of the recording + playing management in a >> > >> unit of time. However adjusting the buffer size would be a first >> step. >> > >> > >> You are using getMinBufferSize() method, but you ignore the returned >> > >> values, when it comes to the buffer used to transfer the recording to >> > >> the playback track. >> > >> > >> You should use Math.max(recordingMinBufferSize, >> playbackMinBufferSize) >> > >> as a buffer size in all 3 cases. >> > >> You should also write only bytesRead bytes, rather than writing full >> > >> buffer every time. >> > >> > >> Daniel >> > >> > >> On Thu, May 26, 2011 at 10:28 AM, neha <[email protected]> wrote: >> > >> > Is there any way to synchronize the capturing and playback of audio >> > >> > data in Android? >> > >> > >> > I am using audioRecord/track to achieve this.But its producing >> echo. >> > >> > Is there any way to cancel echo. >> > >> > My code is- >> > >> > { >> > >> > isRecording=true; >> > >> > >> > bufferSize = >> > >> > >> AudioRecord.getMinBufferSize(8000,AudioFormat.CHANNEL_CONFIGURATION_MONO,AudioFormat.ENCODING_PCM_16BIT); >> > >> > audioRecord = new >> AudioRecord(MediaRecorder.AudioSource.MIC, >> > >> > 8000, >> > >> > >> AudioFormat.CHANNEL_CONFIGURATION_MONO,AudioFormat.ENCODING_PCM_16BIT, >> > >> > bufferSize); >> > >> > >> > audioRecord.startRecording(); >> > >> > >> > int BUFFER_SIZE_IN_BYTES >> > >> > >> =AudioTrack.getMinBufferSize(RECORDER_SAMPLERATE,AudioFormat.CHANNEL_CONFIGURATION_MONO,RECORDER_AUDIO_ENCODING); >> > >> > AudioTrack audioTrack = new >> > >> > AudioTrack(AudioManager.STREAM_SYSTEM, >> > >> > >> 8000,AudioFormat.CHANNEL_CONFIGURATION_MONO, >> > >> > >> AudioFormat.ENCODING_PCM_16BIT, BUFFER_SIZE_IN_BYTES, >> > >> > >> AudioTrack.MODE_STREAM); >> > >> > byte[] buffer=new byte[400]; >> > >> > audioTrack.play(); >> > >> > while (isRecording) { int bytesRead >> = audioRecord.read(buffer, >> > >> > 0, >> > >> > 400); >> > >> > int bytesWritten = >> audioTrack.write(buffer, 0, 400); >> > >> > >> > } >> > >> > >> > -- >> > >> > You received this message because you are subscribed to the Google >> > >> > Groups "Android Developers" group. >> > >> > To post to this group, send email to >> [email protected] >> > >> > To unsubscribe from this group, send email to >> > >> > [email protected] >> > >> > For more options, visit this group at >> > >> >http://groups.google.com/group/android-developers?hl=en >> > >> > >> -- >> > >> Daniel Drozdzewski >> > >> > > -- >> > > You received this message because you are subscribed to the Google >> > > Groups "Android Developers" group. >> > > To post to this group, send email to >> [email protected] >> > > To unsubscribe from this group, send email to >> > > [email protected] >> > > For more options, visit this group at >> > >http://groups.google.com/group/android-developers?hl=en >> > >> > -- >> > Daniel Drozdzewski >> >> -- >> You received this message because you are subscribed to the Google >> Groups "Android Developers" group. >> To post to this group, send email to [email protected] >> To unsubscribe from this group, send email to >> [email protected] >> For more options, visit this group at >> http://groups.google.com/group/android-developers?hl=en >> > > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en > -- You received this message because you are subscribed to the Google Groups "Android Developers" group. 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