Transactions of the American Society of Heating, Refrigerating and Air-Conditioning Engineers 1968 [1] Quote: 'A "purple noise," accordingly, is a noise the spectrum level of which rises with frequency.'
doi.org
Mitchell, Don P. (1987). "Generating Antialiased Images at Low Sampling Densities". Computer Graphics. 21 (4). ss. 65-72. doi:10.1145/37401.37410. ISBN0897912276.
Zhang, Q. J.; Schwarz, K.-P. (April 1996). "Estimating double difference GPS multipath under kinematic conditions". Proceedings of the Position Location and Navigation Symposium - PLANS '96. Position Location and Navigation Symposium - PLANS '96. Atlanta, GA, USA: IEEE. ss. 285-91. doi:10.1109/PLANS.1996.509090.
Hildebrand, John A. (2009). "Anthropogenic and natural sources of ambient noise in the ocean". Marine Ecology Progress Series. Cilt 395. ss. 478-480. Bibcode:2009MEPS..395....5H. doi:10.3354/meps08353.
Välimäki, Vesa; Lehtonen, Heidi-Maria; Takanen, Marko (2013). "A Perceptual Study on Velvet Noise and Its Variants at Different Pulse Densities". Audio, Speech, and Language Processing, IEEE Transactions. ss. 1481-1488. doi:10.1109/TASL.2013.2255281.
Hildebrand, John A. (2009). "Anthropogenic and natural sources of ambient noise in the ocean". Marine Ecology Progress Series. Cilt 395. ss. 478-480. Bibcode:2009MEPS..395....5H. doi:10.3354/meps08353.