[Microbit-Python] A sound related long shot...

[Damien George]

I recorded the sample myself, and turned it into an array of bytes.

On Fri, Oct 16, 2015 at 4:08 PM, Matthew Else <matthewelse1997 at gmail.com> wrote:
> That’s awesome! What samples were you using for the sound/where are they from?
>
> Matthew
>
>
>
> On 16/10/2015, 14:48, "Microbit on behalf of Damien George" <microbit-bounces+matthewelse1997=gmail.com at python.org on behalf of damien.p.george at gmail.com> wrote:
>
>>I have managed to get proper synthesised audio out of the microbit,
>>using a hand-written PWM loop.  As a proof of principle, it can play a
>>short recorded sample.
>>
>>Attached is the firmware.  I won't tell you what the sample is, so see
>>if you can find out!  Here are instructions:
>>
>>1. download firmware.hex to the microbit
>>2. attach a speaker to pin0 and pin1 (don't use ground)
>>3. load up the serial terminal
>>4. execute: synth_run(10, 31, 3)
>>5. listen in awe!
>>
>>You can adjust the numbers passed to synth_run to muck about with the sample.
>>
>>With this we can basically play any audio, from a mod tracker to a
>>speech synth.  The only caveat is that it can't run in the background.
>>The loop needs full control of the CPU to get the audio to play
>>properly.
>>
>>To answer Nicholas' questions:
>>
>>1. Could this be done? Yes.
>>2. Would we want to do it? It would be cool if it (speech synth, or a
>>mod tracker, or ...) was implemented.
>>3. What would need to happen? We need to find someone with the time to
>>implement it!  It's a fair bit of work (but there are no barriers
>>except time).
>>
>>The SAM software would be ideal, if only it were properly licensed.
>>Otherwise there's a fair bit of work to record all the 49 phonemes,
>>etc.
>>
>>Maybe we can just provide some prerecorded samples (eg "exterminate")
>>and provide functions to adjust the pitch, echo, etc, and combine
>>sounds, and then play them?
>>
>>D.
>>
>>
>>
>>
>>On Fri, Oct 16, 2015 at 1:37 PM, Larry Hastings <larry at hastings.org> wrote:
>>>
>>>
>>> On 10/16/2015 05:23 AM, Nicholas H.Tollervey wrote:
>>>
>>> Hi Folks,
>>>
>>> So I was thinking about the amazing example Larry posted yesterday of
>>> the 20yo calculator turned into a multi-part sequencer with effects etc...
>>>
>>> Could we do something just as amazing... would we even want to try..?
>>>
>>> Then I remembered - as a child of the 1980s I had an original BBC B at
>>> home and one of the most amazing feats Superior Software pulled off was
>>> a 7.5k program called, simply, "Speech!". To give you an idea of what it
>>> was like I found this on YouTube:
>>>
>>> https://www.youtube.com/watch?v=t8wyUsaDAyI
>>>
>>>
>>> The equivalent for computers manufactured outside Britain was "Software
>>> Automatic Mouth", or "SAM", available for the Apple ][, Atari 400/800, and
>>> Commodore 64.
>>>
>>> Some enterprising hacker has taken the C=64 version, compiled the assembler
>>> into messy C, cleaned it up (some), and put it up on Github:
>>>
>>> https://github.com/s-macke/SAM
>>>
>>>
>>> He then used Emscript to translate that into Javascript, and behold: web
>>> page demo.
>>>
>>> http://simulationcorner.net/index.php?page=sam
>>>
>>>
>>> (Aside: cripes, modern computers are fast.  Just imagine how awful this code
>>> is, and what a Rube Goldberg machine its runtime must be like.  Yet it runs
>>> in the tiniest fraction of a second.)
>>>
>>> So, thoughts..? Is this even possible..? I imagine a very simple API
>>> such as this:
>>>
>>> import microbit
>>> microbit.say("Hello, World")
>>> microbit.say("Hello, World", pin=microbit.pin1)  # Lke music API
>>>
>>>
>>> Possible, yes.  But I don't know anything about voice synthesis, so I could
>>> hardly write one myself.  And even if SAM is "abandonware", legally somebody
>>> still owns the copyright, so I wouldn't ship that specific implementation.
>>>
>>>
>>> /arry
>>>
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>>>
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