Signals

 In the field of electronics and telecommunications, a signal refers to any time-varying quantity that carries information. Signals can take many forms, such as electrical voltage, current, or electromagnetic waves, and can be used to represent various types of information, such as voice, video, or data.

Signals are typically classified based on their frequency and time-domain characteristics. For example, signals can be periodic or aperiodic, continuous-time or discrete-time, analog or digital, and so on. In addition, signals can be processed and analyzed using various techniques, such as filtering, modulation, demodulation, and Fourier analysis.

Signal processing is a broad field that encompasses the theory and application of techniques for analyzing, synthesizing, and manipulating signals. It has many applications in fields such as telecommunications, audio and video processing, biomedical engineering, and control systems.

इलेक्ट्रॉनिक्स और दूरसंचार के क्षेत्र में, एक संकेत किसी भी समय-भिन्न मात्रा को संदर्भित करता है जो सूचना वहन करता है। सिग्नल कई रूप ले सकते हैं, जैसे विद्युत वोल्टेज, करंट, या विद्युत चुम्बकीय तरंगें, और विभिन्न प्रकार की सूचनाओं, जैसे आवाज, वीडियो या डेटा का प्रतिनिधित्व करने के लिए उपयोग किया जा सकता है। संकेतों को आमतौर पर उनकी आवृत्ति और समय-क्षेत्र विशेषताओं के आधार पर वर्गीकृत किया जाता है। उदाहरण के लिए, सिग्नल आवधिक या एपेरियोडिक, निरंतर-समय या असतत-समय, एनालॉग या डिजिटल, और इसी तरह हो सकते हैं। इसके अलावा, फ़िल्टरिंग, मॉड्यूलेशन, डिमॉड्यूलेशन और फूरियर विश्लेषण जैसी विभिन्न तकनीकों का उपयोग करके संकेतों को संसाधित और विश्लेषण किया जा सकता है। सिग्नल प्रोसेसिंग एक व्यापक क्षेत्र है जिसमें संकेतों का विश्लेषण, संश्लेषण और हेरफेर करने के लिए सिद्धांतों और तकनीकों के अनुप्रयोग शामिल हैं। दूरसंचार, ऑडियो और वीडियो प्रोसेसिंग, बायोमेडिकल इंजीनियरिंग और नियंत्रण प्रणाली जैसे क्षेत्रों में इसके कई अनुप्रयोग हैं।

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