From: "chassaing" <c...@msn.com>
To: "tArAng" <t...@rediffmail.com>
Subject: Re: Re: [c6x]McBSP0 problem
Tarang Dadia
Graduate Student
Wireless Networking Lab
University of Texas at Arlington.
From:
"chassaing" <> Date: (Date Unavailable) Subject: Re: Re: [c6x]McBSP0 problem To: "tArAng" <>
Hi:
If you are trying to detect when speech is
present, you need to set a threshold within your program. When the speech
level reaches that treshold, then you can proceed in your program (with speech
present).
Where are you from? Are you familiar with my
book on the C6x? What is your platform?
Rulph Chassaing
----- Original Message -----
From: tArAng
To: c...@yahoogroups.com
Sent: Wednesday, December 03, 2003 1:59 PM
Subject: Re: Re: [c6x]McBSP0 problem
can u give us more detail about what are the approximate values of the junk
data that u r getting... i mean wht voltage level it corresponds to...Tarang
Dadia Graduate Student Wireless Networking Lab University of
Texas at Arlington.
On Wed, 03 Dec 2003 sachin T wrote : >Hi
Tarang, > > u r right in whatever u have told..but
th eproblem is when I am taking th einput samples thru MIC in,even in total
silence the sample values read by codec and McBSP are not zeroes but have some
amplitude.this could be the DC bias,but sometimes if I dont connect anything to
MIC in n try to read from it,it gives junk instead of zeroes..i want to know how
to set the codec or the McBSP so that my input samples are zeroes when th eMIC
in is left open.... > >Thanks, >Sachin>> From:
"tArAng" <t...@rediffmail.com> >>Reply-To: "tArAng"
<t...@rediffmail.com> >>To: c...@yahoogroups.com >>Subject: Re: [c6x]McBSP0 problem >>Date: 2 Dec 2003
19:02:47 -0000 >> >>Hi sachin, >> >>What i assume from your mail is that you want to calculate the amount
of threshold level in first 1 sec so that the code interprets it as zero voltage
or no noise. >> >>whenever you reman silent there still is
some input to mic that is noise present in the room and that corresponds
to the junk u see in DRR. >> >>I assume, the only reason u
r watching the first second is to fix what the threshold level will be rite ?(
by averaging it over 1 sec) .. so you can essentially subtract this average
value from all your incoming samples and that will give you approximately zero
voltage when you dont speak thru mic.. >> >>Regards >> >>Tarang Dadia >>Graduate Student >>Wireless Networking Lab >>University of Texas at
Arlington. >> >> >>On Sat, 29 Nov 2003 sachin T
wrote : >> >Hi, >> > >> >
I am using EVM 6701,I am reading the input through the MIC in of the >> >EVM(Its codec is CS4231).. I am using the first 1 sec of input
speech to >> >calculate the threshold..and during that time I dont
speak anything..I read >> >the incoming data into a buffer using
the DMA whose source is >> >McBSP(DRR)..now my problem is..I was
assuming if i stay silent the codec >> >will have zeroes as the
values for my input..but even when I am silent the >> >data read
has some junk values....this cud be whatever previous value that >>
>is their in DRR....can anyone tell me how do I reset the DRR to make it
zero >> >and also take care that the code gives zero amplitude
values whenevr I dont >> >speak thru MIC in... >>
> >> >Sachin >> > >>
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