Start with the free speech corpus and tools from voxforge.
Bruce
On November 29, 2014 7:16:13 PM PST, Ricardo Andere de Mello
<[email protected]> wrote:
>Hum...
>
>I guess it would be simpler to create a voice captcha to be used in
>websites.
>The idea is to use the same thing recaptcha uses (human power).
>http://www.google.com/recaptcha/intro/
>
>All you will need is a larger number of samples.
>The user would need to identify two random words by audio.
>If the user dont write the correct words, or just one of them, you give
>another two words to the user.
>
>I really think you dont need a huge number of samples, but to be a
>functional captcha it is a good idea to block more than x consecutive
>errors from same ip, and at the analysis cut below the 'median' of the
>data.
>
>This is just an idea... maybe you can contact the recaptcha people to
>see
>if it would be possible to use the audio captcha they already have for
>this
>purpose.
>
>Statistically, the distribution of errors will give you all the levels
>you
>need. :)
>
>[]s, Ricardo Mello (gandhi)
>
>2014-11-29 20:00 GMT-02:00 Kristoff <[email protected]>:
>
>> Hi all,
>>
>>
>>
>> In theory, it is simply: errors in the communication path result in
>> errors in the codec2 stream, that might or might not get corrected by
>> the FEC-system. This may result in impaired speech decoding.
>>
>> The problem is this:
>>
>> As codec2 supports more and more different bitrates and different
>modems
>> are getting developed using different bitrates, different FEC scemes
>and
>> differt modulation scemes, the end-result -the demodulated voice
>audio-
>> can differ quite a bit depeding on a lot of different factors,
>> especially if the transmission-stream is impacted by interference.
>> In addition to this, the subjective perception how good / acceptable
>/
>> bad decodec voice sounds will probably differ from person to person.
>>
>>
>> In the end, the proof of the pudding is in the eating. That is why we
>> would like to propose this:
>>
>> - We are looking for somebody who can set up/create a webbased system
>to
>> allow people (anybody on the web) to "score" audio-samples. These
>> samples are the same audio-fragment per test-batch, encoded using
>> different codecs, different bitrates or
>> formated/modulated/corrupted/demodulated/extracted using different
>modems.
>>
>> - A test would be a batch of (say) 10 audio-samples. The user should
>get
>> to hear them one by one and be able to give a score (say between 1
>and
>> <whatever>) for everyone of them.
>>
>> - For every tests, different audio-samples and/or in different order
>> should be provided.
>>
>> - The user should not receive any "background" information about the
>> audio-sample, this to assure the double-blind characteristic of the
>test.
>>
>>
>>
>> The end is to have a database of subjective scores by as much people
>as
>> possive, of codec2 encoded at different bitrates and the resistance
>of a
>> particual modem to transmission-errors
>>
>> One of the questions we want to answer is:
>> "do we need add FEC to a modem to transmit codec2 over the radio"?
>Does
>> it help? Does it help enough to counter the lower S/N due to the wide
>> bandwidht.
>> Or perhaps a "halfway" sollution and only protecting part of the
>voice
>> data is better?
>>
>>
>>
>>
>> As noted above, this is something where -I think- the community can
>do
>> its part. If you have experience with setting up web-based
>application,
>> this is your change to win etteral fame in "the codec wars".
>>
>> This initiative should really will help codec2 by allowing the
>> developers of the codec, the modems and the upper-layer applications
>to
>> mix-and-match the correct combination of all element to provide hams
>> worldwide the best possible codec2 DV experience, on HF and on
>VHF/UHF.
>>
>>
>>
>> 73
>> Kristoff - ON1ARF
>>
>>
>>
>>
>------------------------------------------------------------------------------
>> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
>> from Actuate! Instantly Supercharge Your Business Reports and
>Dashboards
>> with Interactivity, Sharing, Native Excel Exports, App Integration &
>more
>> Get technology previously reserved for billion-dollar corporations,
>FREE
>>
>>
>http://pubads.g.doubleclick.net/gampad/clk?id=157005751&iu=/4140/ostg.clktrk
>> _______________________________________________
>> Freetel-codec2 mailing list
>> [email protected]
>> https://lists.sourceforge.net/lists/listinfo/freetel-codec2
>>
>
>
>------------------------------------------------------------------------
>
>------------------------------------------------------------------------------
>Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
>from Actuate! Instantly Supercharge Your Business Reports and
>Dashboards
>with Interactivity, Sharing, Native Excel Exports, App Integration &
>more
>Get technology previously reserved for billion-dollar corporations,
>FREE
>http://pubads.g.doubleclick.net/gampad/clk?id=157005751&iu=/4140/ostg.clktrk
>
>------------------------------------------------------------------------
>
>_______________________________________________
>Freetel-codec2 mailing list
>[email protected]
>https://lists.sourceforge.net/lists/listinfo/freetel-codec2
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
------------------------------------------------------------------------------
Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
from Actuate! Instantly Supercharge Your Business Reports and Dashboards
with Interactivity, Sharing, Native Excel Exports, App Integration & more
Get technology previously reserved for billion-dollar corporations, FREE
http://pubads.g.doubleclick.net/gampad/clk?id=157005751&iu=/4140/ostg.clktrk
_______________________________________________
Freetel-codec2 mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/freetel-codec2
