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A world of signals and signal processing
Technological innovations have revolutionized the way we view and interact with the world around us. Editing a photo, re-mixing a song, automatically measuring and adjusting chemical concentrations in a tank: each of these tasks requires real-world data to be captured by a computer and then manipulated digitally to extract the salient information. Ever wonder how signals from the physical world are sampled, stored, and processed without losing the information required to make predictions and extract meaning from the data?
Signal processing is the study of signals and systems that extract information from the world around us.
Signals, defined
Perhaps the place to start the study of signal processing is the dictionary. The dictionary definition of a signal will serve us quite well:
A
signal is "is a detectable physical quantity...by which messages or information can be transmitted."
And this information aspect is very, very critical to us. In other words, signals carry information. Signals are all around us;
we encounter them throughout our day. Speech signals, for example, transmit language from one person to another via acoustic waves.If you're interested in looking for, for example, airplanes our other targets and sensing them by electromagnetic waves,
you can use radar signal processing. Electrophysiological signals carry information about processes that are going on inside our bodies, things like EKGs or MRI images. And finally, financial signals transmit information about events in the economy, signals like stock prices over time or other economic markers.So as you can see, signals are really very common in the world.
And this course is about signals and the signal processing systems that manipulate signals in order to understand or make transformations on the information in those signals.
Signals are functions
Signal
- A
signal is a function that maps an independent variable to a dependent variable.
Mathematically, we're going to think of signals as functions, and a function is just a mapping from an independent variable that we can change to a dependent variable that depends on that independent variable. The terminology
is how we're going to denote a signal.
It consists of an independent variable,
, that for each different value of
,
it produces the value
.
Discrete-time signals
Perhaps you are wondering about the use of brackets--instead of parentheses--in our signal function notation
. This is the typical way to refer to
discrete-time signals. A discrete-time signal is a signal where the independent variable
is an integer (as opposed to a continuous-time signal
, whose independent variable
is a real number).
Questions & Answers
I'm interested in biological psychology and cognitive psychology
what does preconceived mean
How can I develope my cognitive domain
why is communication effective
Communication is effective because it allows individuals to share ideas, thoughts, and information with others.
effective communication can lead to improved outcomes in various settings, including personal relationships, business environments, and educational settings. By communicating effectively, individuals can negotiate effectively, solve problems collaboratively, and work towards common goals.
it starts up serve and return practice/assessments.it helps find voice talking therapy also assessments through relaxed conversation.
miss
Every time someone flushes a toilet in the apartment building, the person begins to jumb back automatically after hearing the flush, before the water temperature changes. Identify the types of learning, if it is classical conditioning identify the NS, UCS, CS and CR. If it is operant conditioning, identify the type of consequence positive reinforcement, negative reinforcement or punishment
please i need answer
Wekolamo
because it helps many people around the world to understand how to interact with other people and understand them well, for example at work (job).
Agreed 👍 There are many parts of our brains and behaviors, we really need to get to know. Blessings for everyone and happy Sunday!
ARC
A child is a member of community not society elucidate ?
Isn't practices worldwide, be it psychology, be it science. isn't much just a false belief of control over something the mind cannot truly comprehend?
compare and contrast skinner's perspective on personality development on freud
Skinner skipped the whole unconscious phenomenon and rather emphasized on classical conditioning
war
explain how nature and nurture affect the development and later the productivity of an individual.
nature is an hereditary factor while nurture is an environmental factor which constitute an individual personality. so if an individual's parent has a deviant behavior and was also brought up in an deviant environment, observation of the behavior and the inborn trait we make the individual deviant.
Samuel
I am taking this course because I am hoping that I could somehow learn more about my chosen field of interest and due to the fact that being a PsyD really ignites my passion as an individual the more I hope to learn about developing and literally explore the complexity of my critical thinking skills
and having a good philosophy of the world is like a sandwich and a peanut butter 👍
Jonathan
generally amnesi how long yrs memory loss
interpersonal relationships
What would be the best educational aid(s) for gifted kids/savants?
treat them normal, if they want help then give them.
that will make everyone happy
Saurabh
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Source:
OpenStax, Discrete-time signals and systems. OpenStax CNX. Oct 07, 2015 Download for free at https://legacy.cnx.org/content/col11868/1.2
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