TAO, Hong. Research on DTMF signal detection algorithm for FFT. Transactions on Computer Science and Intelligent Systems Research, [S. l.], v. 11, p. 80–85, 2025. DOI: 10.62051/a1k9pn55. Disponível em: https://tcsisr.org/index.php/ojs/article/view/14. Acesso em: 4 apr. 2026.