Direct to home Broadcast (DTH), Digital audio broadcast (DAB) explain what, why and how it works , characteristics and key components

Direct to Home Broadcast (DTH):

What: DTH is a digital satellite service that provides television viewing services directly to subscribers anywhere in the country. The signals are sent from satellites orbiting the Earth and received by a dish installed at the subscriber's home.

Why: DTH offers better picture quality and less interference than traditional analog television. It also allows for more channels and services, including interactive services and internet access.

How it works: The broadcaster sends the signals to the satellite, which then sends the signals back to Earth. These signals are picked up by a dish installed at the subscriber's home. The signals are then decoded by a set-top box and displayed on the television.

Characteristics: DTH offers high-quality picture and sound, a wide range of channels, and additional services like pay-per-view and interactive services. It also allows for individualized subscriptions, where subscribers only pay for the channels they want to watch.

Key Components: The key components of a DTH system are the broadcasting center, satellites, and the subscriber's receiving equipment, which includes the dish and the set-top box.

Digital Audio Broadcast (DAB):

What: DAB is a digital radio technology for broadcasting radio stations. It is an upgrade from the old analog radio and offers more channels and better sound quality.

Why: DAB offers a more efficient use of spectrum than analog radio. It also offers better sound quality and more channels. Additionally, DAB radios can display text and images, enhancing the listening experience.

How it works: The audio is first converted into a digital signal. This signal is then compressed and combined with other signals. The combined signal is then broadcasted, and a DAB radio receives and decodes it.

Characteristics: DAB offers CD-like audio quality, a wide range of channels, and additional services like pause and rewind, and display of text and images.

Key Components: The key components of a DAB system are the audio encoder, the multiplexer, the modulator, and the DAB receiver.