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Difference between QAM Signal and Digital Signal

Difference between QAM Signal and Digital Signal

Digital signals are the current industry standard for transmitting information, replacing the older analog methods. But what is the difference between digital and QAM signals? In this article, we’ll take a look at the characteristics of each type of signal and explore some of the benefits of using digital technology in your business.

What is QAM Signal?

QAM signal is a type of signal modulation that is used in digital and cable television systems. QAM is an acronym for quadrature amplitude modulation. QAM signal uses two phase-shifted signals to carry the data. QAM signal has a bandwidth that is twice that of the data rate. QAM signals are more resistant to interference than AM signals. QAM signals can be transmitted over long distances without the need for repeaters.

QAM signal is also used in some types of computer networks. QAM signal has spectral lines that are spaced at intervals of k/T, where k is an integer and T is the duration of the symbol time. The spectral lines of a QAM signal are symmetric about the carrier frequency. QAM signal is affected by phase noise, which results in a loss of data. QAM signals are also subject to intersymbol interference, which limits the data rate that can be achieved.

What is Digital Signal?

Digital signal is a signal that has been sampled and then converted into digital form. The process of sampling a signal converts the signal from an analog format to a digital format. In order to be able to sample a signal, the signal must first be digitized. This is done by using an ADC, or Analog-to-Digital Converter. The ADC samples the analog signal at a specific interval and assigns a numeric value to the samples. The resulting sequence of numeric values is the digital signal. Digital signals can be processed and manipulated using digital signal processing algorithms. Digital signal processing is used in a variety of applications such as audio and video processing, telecommunications, and control systems.

Difference between QAM Signal and Digital Signal

QAM signals are amplitude-modulated signals that are typically used to transmit digital data. The main difference between QAM signals and digital signals is that QAM signals are continuous, while digital signals are discrete. This means that QAM signals can carry more information than digital signals. However, it also means that QAM signals are more susceptible to noise and interference. As a result, QAM signals typically need to be encoded using error-correction codes in order to ensure reliable communication.


Although digital signals are the newer technology, both QAM and digital signals have their benefits and drawbacks. If you’re looking to invest in a new TV or upgrade your current one, it’s important to understand the difference between these two types of signals so that you can make an informed decision. At our company, we pride ourselves on helping people make the most of their electronics investments.

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