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Difference between QAM and ATSC

Difference between QAM and ATSC

QAM and ATSC are two different modulation schemes used for digital transmission. While both offer similar features, there are some key differences between the two. This blog post will take a closer look at each modulation scheme and explore its benefits of each.

What is QAM?

QAM is an acronym for Quadrature Amplitude Modulation. QAM is a digital modulation scheme that uses a combination of phase and amplitude modulation to encode data. QAM is used in many applications including WiFi, cable TV, and satellite TV. QAMmodulators are usually built using QPSK or QAM-16 modulation schemes. QAM has the benefit of being very spectrally efficient and can be used to transmit large amounts of data over a limited frequency range. QAM is also very robust against interference and can be used in difficult environments such as high-noise environments or multipath fading channels.

What is ATSC?

ATSC is an international, non-profit organization that develops standards for digital television. ATSC’s mission is to ” promote the advancement of digital television technology throughout the world.” ATSC’s standards are used in the United States, Canada, South Korea, Mexico, and other countries. ATSC’s standards cover a wide range of topics, including:
– Digital audio and video compression
– Transmission of digital audio and video over terrestrial, cable, and satellite networks
– Interactivity and data services
– ATSC’s work is important for the continued development of digital television. ATSC’s standards enable innovation and allow for the introduction of new technologies and services. In addition, ATSC’s work helps to ensure compatibility between different digital television systems. ATSC is an important organization for the future of digital television.

Difference between QAM and ATSC

QAM and ATSC are two different types of cable used to deliver digital television signals. QAM, or Quadrature Amplitude Modulation, is the older of the two technologies and is used by most cable providers. ATSC, or Advanced Television Systems Committee, is a newer technology that is used by some over-the-air broadcasters. QAM and ATSC both use digital signal compression to reduce the amount of bandwidth required for transmission.

QAM signals are typically transmitted at 6 MHz, while ATSC signals are transmitted at 8 MHz. QAM signals can be further divided into sub-channels, which allows for more efficient use of bandwidth. ATSC uses a single high definition (HD) channel instead of sub-channeling. As a result, QAM is more efficient in terms of bandwidth utilization than ATSC. QAM also has the advantage of being less susceptible to interference than ATSC.


Although the two cable types are similar in some ways, there are a few key differences that set them apart. QAM is an older technology and can be found in more areas than ATSC. However, ATSC offers higher-quality video and audio signals. If you’re looking for the best possible picture and sound quality, go with ATSC. Otherwise, QAM may be a better option if your area doesn’t have good reception for ATSC signals.

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