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Sound card Mozart 16 for ISA-16 bus A Turtle Beach sound card for PCI bus Echo Digital Audio's Indigo IO – PCMCIA card-bit 96 kHz stereo in/out sound card A VIA Technologies Envy sound card for PC, 5.1 channel for PCI slot. Sound cards for IBM PC–compatible computers were very uncommon until 1988.
Fldigi (short for Fast light digital) [4] is a free and open-source program which allows an ordinary computer's sound card to be used as a simple two-way data modem.The software is mostly used by amateur radio operators who connect the microphone and headphone connections of an amateur radio SSB or FM transceiver to the computer's headphone and microphone connections, respectively.
Up to 25 MHz (40 MHz b/w cards limited by GigE interface) [126] 14 16 Yes 25 Msps for 16-bit samples; 50 Msps for 8-bit samples 0.5 ppm TCXO. 0.01 ppm w/ GPSDO Option Gigabit Ethernet Yes Yes Yes Xilinx Spartan 3A-DSP 1800 USRP N210 [127] Pre-built DC – 6 GHz Up to 25 MHz (40 MHz b/w cards limited by GigE interface) [126] 14 16 Yes
AM broadcasting is radio broadcasting using amplitude modulation (AM) transmissions. It was the first method developed for making audio radio transmissions, and is still used worldwide, primarily for medium wave (also known as "AM band") transmissions, but also on the longwave and shortwave radio bands.
The sound of the program material, usually coming from a radio studio, is used to modulate (vary) a carrier wave of a specific frequency, then broadcast. In AM broadcasting, the amplitude of the carrier wave is modulated to encode the original sound. In FM broadcasting, the frequency of the carrier wave is modulated to encode the sound.
Marantz 2050L AM/FM stereo tuner (USA; 1978-1980) [1]. In electronics and radio, a tuner is a type of receiver subsystem that receives RF transmissions, such as AM or FM broadcasts, and converts the selected carrier frequency into a form suitable for further processing or output, such as to an amplifier or loudspeaker.
Software-defined radio (SDR) is a radio communication system where components that conventionally have been implemented in analog hardware (e.g. mixers, filters, amplifiers, modulators/demodulators, detectors, etc.) are instead implemented by means of software on a computer or embedded system. [1]
In broadcast services, where audio fidelity is important, wideband FM is generally used. Analog TV sound is also broadcast using FM. Narrowband FM is used for voice communications in commercial and amateur radio settings. In two-way radio, narrowband FM (NBFM) is used to conserve bandwidth for land mobile, marine mobile and other radio services.