I want to study DSP, But I have a lot of trouble.

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Recently, I decide to study DSP (digital signal processing).I have already read many books.It's time to do experiment.But I don't have DSP development tools...Because I don't have enough money to buy a development tools. I hope you can help me.. thank you. DSP development tools’s price : 500 dollar . please help This is my E_MAIL: scgyzdj@hotmail.com