Lecture 4:Complex Waves and Spectra

Which is the best answer?

• Power- amount of snow

  Power is typically measured in watts

• Power- amount of energy

  Power is typically measured in watts

• Power- amount of energy

  Power is typically measured in chocolate

• Power- amount of energy is typically measured in watts

Which statement is correct?

• we can tell the dierence

  between

  Use log scale in sound because we have a small dynamic

  range.

• we can tell the dierence

  between

  Use raw scale in sound because we have a large dynamic

  range.

• we can tell the dierence

  between

  Use log scale in sound because we have a discreet

  range.

• we can tell the dierence

  between

  Use log scale in sound because we have a large dynamic

  range.

Which answers all fit?

If we use a linear scale we loose a lot of _____ about differences in low intensity sounds

Much of the sounds we are interested in are in the _____ intensity r Log scale (dB) _____ out this range Log Scale Log scale Linear scale whisper conversation rock Level in energy

• information,

  lower,

  contracts

• information,

  lower,

  stretches

• information,

  upper,

  stretches

• information,

  middle

  ,stretches

What isthe dynamic range of human hearing ?

• the dynamic range of human hearing is 10-14 watts/m2 If we used the bel scale, the total dynamic range relevant for human hearing would be 8 Bels.

• the dynamic range of human hearing is 10-14 watts/m2 If we used the bel scale, the total dynamic range relevant for human hearing would be 14 Bels.

• the dynamic range of human hearing is 10-14 watts/m2 If we used the bel scale, the total dynamic range relevant for human hearing would be 14 snowballs.

• the dynamic range of human hearing is 10-14 watts/m2 If we used the bel scale, the total dynamic range relevant for human hearing would be 1400 Bels.

Which statement BEST describes sine waves

• Complex Waves The sine wave is the sign at the surf shop

• Complex Waves The sine wave is the fundamental component of all sounds

  All waves that are not sine waves are complex waves All of the natural sounds we encounter in the environment are complex waves

  Made up by adding together sine waves

• Complex Waves The sine wave is the fundamental component of all sounds

  All waves that are not sine waves aresimple waves All of the natural sounds we encounter in the environment are complex waves

  Made up by adding together sine waves

Summing Waves

Combining waves is simply adding together_________

Summing together sine waves of different frequencies results in complex _____________________

• the instantaneous amplitudes over time.

  complex waves that have different qualities

• the instantaneous amplitudes over fish.

  complex waves that have different qualities

• the slow developing amplitudes over time.

  complex waves that have different qualities

• the instantaneous flying monkeys over time.

  complex waves that have different qualities

Types of Waves

Simple- sound wave made up of ____ sine wave (freq)

Complex- sound wave made up of ___ or more sine waves (freqs

• one

  and

  three

• one and two

• wild,

  crazy

• very low,

  two

Periodic – wave that _______________________

Aperiodic- wave that DOES NOT repeat is cycle over time

• repeats its cycle over time. Can be simple or complex

• does not repeat its cycle over time. Can be simple or complex

• Sometimes you wave, sometimes you dont,

• repeats its cycle over time. It is always simple.

Spectra

does what?

• Spectra

  Breaks down simple sounds into the individual frequency components.

• Spectra

  Breaks down complex sounds into the multiple frequency components.

• Spectra

  Breaks down complex noodles into the individual frequency components.

• Spectra

  Breaks down complex sounds into the individual frequency components.

Spectral analysis is also referred to as _____ analysis

• Michael Hammer

• Aaron Rogers

• Fourier

• psychological