Audio System Components Explained
Sound Basics
Sound: the sensation produced in the ear by sound waves. The human ear distinguishes 3 qualities: loudness, pitch, and timbre.
Audio Sources
Audio sources generate sound signals. These include analog tuners (AM, FM) and digital tuners (DAB).
Source Features
- Distortion: Harmonic distortion (THD) is the most important. It is measured in percentage (%). The lower the value, the better the sound quality.
- Signal-to-Noise Ratio: Measured in dB. The higher this value, the less noise is introduced
Wireless Communication Techniques: OFDM, Diversity, and Propagation
Wireless Communication Techniques
1️⃣ Orthogonal Frequency Division Multiplexing (OFDM)
Definition:
OFDM is a multi-carrier modulation (MCM) technique where the total bandwidth is divided into multiple orthogonal subcarriers to reduce Inter-Symbol Interference (ISI) and enhance data transmission efficiency.
Block Diagram:
Transmitter:
Input Data → Serial-to-Parallel → Modulation (QAM/PSK) → IFFT → Cyclic Prefix Addition → Parallel-to-Serial → TransmissionReceiver:
Received Signal → Serial-Tipos de Textos y Procesos de Comunicación
Textos Periodísticos: Información y Opinión
Ofrecen información u opiniones objetivas sobre temas de actualidad. Poseen características propias que los distinguen de otros textos.
Textos Informativos
Reportan de manera objetiva y clara sobre hechos de actualidad. La objetividad e imparcialidad son sus rasgos más importantes.
Características:
- Objetividad e imparcialidad
- Léxico de nivel medio
- Sintaxis sencilla
- Estilo impersonal
- Estructura de pirámide invertida
Subgéneros Informativos:
- Noticia
- Entrevista
- Crónica
Textos
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