5/1/2023 0 Comments Cb radio box for pcIncreasing modulating signal amplitude also increases carrier frequency. ![]() Since information signal amplitude varies, it produces proportional shifts in carrier frequency. The carrier's peak amplitude remains constant in FM, while carrier frequency is changed by the action of the modulating signal (Ibarra et al., 2007). It can be seen in Figure 1c that amplitude modulation produces an envelope signal on the carrier.įundamentals of frequency modulation (FM) Figure 1a shows an example of a 300 Hz information signal įigure 1b shows the 5 kHz carrier signal. information retrieval, which is also called detection). Then there is the demodulation process (i.e. Low frequency (LF) information is mixed with the radio frequency (RF) carrier this is called modulation (Jardon, 2002). Transmission involves two fundamental processes. Radio and television could not have been possible without such modulation. Amplitude modulation occurs when a low frequency (LF) signal controls the amplitude of a high frequency (HF) wave. This modulation technique varies radio frequency wave amplitude. ANSI / IEEE 488.2 strengthened the original standard defining how controllers and instruments communicate in 1987 standard commands for programmable instruments (SCPI) took command structure defined as IEEE 488.2 and created a single comprehensive programming command which is used with any SCPI instrument.įundamentals of amplitude modulation (AM) The name general purpose interface bus (GPIB) is more used today than HP-IB. It was later accepted as IEEE standard 488 in 1975 and was involved in ANSI / IEEE 488.1 in 1987. This bus quickly gained popularity due to its high transfer rates (nominally 1 Mbytes / s). Hewlett-Packard designed the Hewlett-Packard interface bus (HP-IB) in 1965 to connect their line of programmable instruments to their computers. They were originally designed for information purposes only and then began to vary their range of action to provide information, music, culture, entertainment, etc. government, private, for cultural, commercial). The origin of radio stations in different parts of the world has been very different (i.e. This first wireless communication continued a series of technological advances which gradually improved communication quality and quantity. The author of this great discovery was Gugliermo Marconi, an Italian physicist (Tomasi, 2003). The first wireless telegraph communication happened on May 14th 1894 between Laverck Point and Fratholm Island in the Bristol Channel which are separated by a distance of about 5 miles. ![]() This communications' medium emerged from a succession of discoveries which began in the late nineteenth century. Received: feb 27th 2009 Accepted: march 27th 2010 Key words: Amplitude modulation, frequency modulation, general purpose interface bus (GPIB), radio frequency carrier, modulating signal. Computer users can enter the desired transmission frequency within the commercial band as well as the transmission potency. Developing the graphical user interface for the software and the interconnection with an RF function generator by means of a GPIB is presented. This article presents the development of a personal computer-based AM/FM radio station operating on the AM/FM commercial band. ![]() Developing and integrating a computer-based AM/FM radio stationĮverardo Inzunza González 1, Jesús Everardo Olguín Tiznado 2, Juracy Soares López 3, Liliana Cardoza Avendaño 4, Claudia Camargo Wilson 5 and Juan Miguel Hernández Ontiveros 6
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