Can I make midi music with a PIC16F873a

[sougata]

Hi,

If I have understood correctly then you want a custom melody to be reproduced by a standalone circuit. You would play/sequence the number on your casio keyboard.

There is an application of a PIC playing 1bit audio available here http://members.home.nl/b.vandam/lonely/pagina47.html This may be interesting for you.

There are OTP (One Time Programmable) Voice chip available from APLUS INC. http://www.aplusinc.com.tw I have checked their Indian website and found that a chip capable of recording about 341 seconds audio costs around $2.5 USD. They sale in low quantities too. But I have no idea if they would ship international. Beware these OTP chips may need a dedicated programmer (costs around $200 USD). Do not expect great sound quality. Because it uses a maximum of 8KHz sampling rate and uses 4bit ADPCM compression. It can also record PCM but that will reduce the playback time. These can be controlled by a PIC to playback multiple segments . I have seen one application here by charudatt who uses a PIC clock to enchant digital mantras. I am not sure if he uses one of these. But they are available in his hometown Mumbai in India. I am attaching one datasheet for your reference.

Aplus also makes melody generators (sort of a MIDI playback engine mainly targeted as bells/ringers) . You don't get enough polyphony or rich sound due to the limited fm synthesis (May be there are some which uses a ROM table).

There are chips from Aplus which can record/re-record audio standalone or controlled by a micro. But they are more expensive.Price is directly proportional to the maximum recording time.

I think I have seen a post by Melanie producing tunes. Why not post your sample tune here ?! In MP3/Wave/Midi whatever.

Please describe your application in details. May be someone from here has done before.