What is external feedback? What is feedback?

Generally refers to the fact that the thing that is emitted returns to the starting point of the emitter and has an impact.

Feedback. Feedback, also known as feedback, is a basic concept of cybernetics, which refers to the process of returning the output of the system to the input and changing the input in a certain way, and then affecting the function of the system, that is, the process of returning the output to the input through an appropriate detection device and comparing the input quantity. Feedback can be divided into negative feedback and positive feedback.

The former makes the output play the opposite role of the input, so that the error between the output of the system and the target of the system is reduced, and the system tends to be stable; The latter makes the output play a similar role to the input, so that the deviation of the system continues to increase, so that the system oscillates, and the control effect can be amplified. The study of negative feedback is a central issue in cybernetics.

A portion of the energy in the output circuit of the amplifier is fed back into the input circuit to enhance or attenuate the effect of the input signal. Positive feedback that enhances the effect of input signals; Negative feedback that weakens the effect of the input signal. Positive feedback is often used to produce oscillations; Negative feedback can be stably amplified and distorted, so it is widely used in amplifiers.

Medically refers to certain physiological or pathological effects that in turn affect the cause of such effects. The positive feedback that plays an enhancing role is called; The weakening effect is called negative feedback. (information, reflections, etc.) returns:

Information on the market sales situation is constantly coming to the factory.

Communication feedback: refers to the response of the recipient to the information received in the process of communication, obtaining feedback information is the intention and purpose of the communicator, and giving feedback is the embodiment of the initiative of the recipient.

For example, if you are a manufacturer of toys, do you like the toys you produce, you can find some staff to do a questionnaire, they go outside to investigate, come back and give you the questionnaire, what you get is external feedback information, this is a great help for your future production, external feedback mainly refers to consumer feedback on the quality and cost performance of the product.

That is, the feedback given by people or things other than the operator himself is the feedback of external information sources such as teachers, coaches, demonstrators, videos, computers and other external information sources on the learner's operation results and operation process.

Generally refers to the fact that the delayed state of the emitted object returns to the starting point of the emitter and has an impact.

"Feedback" means (information, reflection, etc.) return, mostly refers to the implementation of ** or the opposite project plan has any opinions, suggestions, and then use **, message and other ways to communicate.

Example] 1. You sort out the feedback information on the Internet.

2. The pilot program will be expanded, and you will make a plan based on user feedback.

3. There is so much feedback from the masses, which shows that there are still problems in the implementation of the project and needs to be improved.

Feedback is also known as feedback.

It is one of the basic concepts of modern science and technology. In general, cybernetics.

The concept of feedback refers to the process of returning the output of the system to the input and changing the input in a certain way, thereby affecting the function of the system, that is, the process of returning the output to the input through an appropriate detection device and comparing the input quantity.

History. Self-regulating machines have existed since ancient times, and the concept of feedback entered the realm of economic theory in England in the eighteenth century, but it was not named because it was not regarded as a universal abstraction at the time. Tong key.

The verb form "to feed back" in English, meaning "to return to an earlier state" in a mechanical process, began to be used in the United States in the sixties of the 19th century. In 1909, Nobel laureate.

Carl Braun began to use the phrase "feed-back" as a noun to denote the coupling between components in a circuit.

Feedback has been widely used in electronic circuit systems, and many properties of amplification circuits can be improved by introducing feedback.

1. What is feedback?

The so-called feedback is the process of automatically adjusting the input signal of the amplification circuit by sending part or all of the output signal (voltage or current) of the amplification circuit back to its input loop through a certain circuit form (feedback network).

1.Block diagram of feedback.

2.Closed-loop amplification circuit and open-loop amplification circuit.

3.How can you tell if a circuit has feedback? (Method).

2. Positive feedback and negative feedback.

Depending on the polarity of the feedback, feedback can be divided into positive and negative feedback.

How to determine the feedback polarity of a circuit --- instantaneous polarity method.

Transient polarity relationship of common amplifier devices:

If BJT is input from the base, then the phase relationship between each pole (A) is diagram, and BJT is input from the emitter to dismantle the missing signal, then the phase relationship between each pole (B) diagram, and the phase relationship between each pole of the op amp (C) diagram.

3. DC feedback, AC feedback and AC and DC feedback.

Method: Capacitance observation method: if the feedback path has DC-blocking capacitance, it is AC feedback; If the feedback path has a bypass capacitor, it is DC feedback; If the feedback pathway.

If there is no capacitance, it is AC and DC feedback.

Fourth, according to the feedback signal is connected with the amplification circuit stage, there are this level of feedback and interstage feedback.

5. Four basic types of feedback.

1) According to the different sampling objects of the feedback output, it is divided into voltage feedback and current feedback.

Method: Shorting UO=0 (or load RL), if XF=0, it is voltage feedback; Otherwise, it is current feedback.

2) According to the different ways of superposition of feedback signal and input signal at the input end, it is divided into series feedback and parallel feedback.

Method: The feedback point is grounded, if xi can still be input to the amplification circuit, it is a series anti-travel feed; Otherwise, it is parallel feedback.

3) Based on the above two points, the feedback is divided into four types: voltage series, current series, voltage parallel, and current parallel.

<> feedback means that something that is emitted returns to the point of origin from which it was emitted and has an impact.

Feedback: [ fǎn kuì ].

Explain in detail. 1. One of the basic concepts of modern science and technology.

It originated in radio engineering technology and later became an important principle for the study of self-regulation phenomena in the fields of biological, social and production technology. Feedback is the reaction of the controlled process to the control body, and this reaction affects the actual process or outcome of the system. Through the concept of feedback, we can deeply understand the functions and dynamic mechanisms of various complex systems, and further reveal the common relationship between different forms of material movement of branches and barks.

2. It refers to the electron tube or transistor circuit, which sends a part of the energy in the output circuit back to the input circuit to enhance or reduce the effect of the input signal.

3. In a communication system, those signals that indirectly return the "input" or signal source from the "output" or the receiver can provide information about the transmission efficiency and subtlety.

Reason for "Iron Blood": "A whirlwind of productivity and information-sensitive feedback systems didn't happen in a day. ”

4. Refers to the transmission of the above information.

5. Physiology or medicine refers to certain physiological or pathological effects that in turn affect the causes of such effects.

What is Feedback? Collapse.

Have you ever seen training dolphins? The dolphin trainer rewards the dolphin when it performs the desired action, and if the dolphin does not perform the correct desired behavior, the dolphin trainer redirects until the dolphin performs the desired behavior. The effect of feedback is twofold:

1. Promote desired behaviors.

2. Modify undesirable behaviors and gradually lead to desired behaviors.

In a team, we also want to be able to guide team members to do things right, so feedback is a very important skill.

What happens if there is no feedback?

Imagine you're driving in the middle of the desert as far as the eye can see, without any road signs, without any vertical meditation around, and if you keep driving, do you know you're going to drive to **? There is a high probability that you will draw a large circle and return to the same place, and many people get lost in the desert and die in this way. So you need someone to tell you that you are not on the right track right now, and if not, how to get back to the right direction and path?

That's where feedback comes in.

Note that feedback is divided into positive and negative feedback. Positive feedback is generally praise, appreciation, encouragement. Expect you to continue or reinforce certain desired behaviors, such as completing work on time and actively helping others.

Negative feedback is for behaviors that need to be corrected. Please note that negative feedback is not criticism or accusation. Criticism or accusation represents a conclusion, an opinion, a kind of condescending posture.

Feedback is equal and consultative. Criticism can bring punishment. Negative feedback, on the other hand, is for mutual growth, learning and ability improvement.

Criticism is hateful. Feedback, on the other hand, is appreciated because it is the starting point of helping others, and gradually builds a constructive relationship of trust and mutual assistance.