Bartlett (``Triangular'')

$$w(n) = w_R(n)\left[1 - \frac{\vert n\vert}{(M-1)/2}\right] %\; n\in\left[...$$

• Convolution of two half-length rectangular windows
• Window transform is sinc$^2 \implies$
  • First sidelobe twice as far down as rect (-26 dB)
  • Main lobe twice as wide as that of a rectangular window having the same length
    (same as that of a half-length rect used to make it)
• Often applied to sample correlations of finite data
• Also called the ``tent function''
• $M-1$ often replaced by $M$ or $M+1$ to avoid including endpoint zeros