Black recording
Encyclopedia
In telecommunication
, the term black recording has the following meanings:
1. In facsimile
systems using amplitude modulation
, recording in which the maximum received power
corresponds to the maximum density of the record medium
.
2. In a facsimile system
using frequency modulation
, recording in which the lowest received frequency corresponds to the maximum density of the record medium.
Source: Federal Standard 1037C
and MIL-STD-188
Telecommunication
Telecommunication is the transmission of information over significant distances to communicate. In earlier times, telecommunications involved the use of visual signals, such as beacons, smoke signals, semaphore telegraphs, signal flags, and optical heliographs, or audio messages via coded...
, the term black recording has the following meanings:
1. In facsimile
Fax
Fax , sometimes called telecopying, is the telephonic transmission of scanned printed material , normally to a telephone number connected to a printer or other output device...
systems using amplitude modulation
Amplitude modulation
Amplitude modulation is a technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. AM works by varying the strength of the transmitted signal in relation to the information being sent...
, recording in which the maximum received power
Power (physics)
In physics, power is the rate at which energy is transferred, used, or transformed. For example, the rate at which a light bulb transforms electrical energy into heat and light is measured in watts—the more wattage, the more power, or equivalently the more electrical energy is used per unit...
corresponds to the maximum density of the record medium
Record medium
In telecommunication, the term record medium has the following meanings:# The physical medium on which information is stored in recoverable form. For example, magnetic tape or disk....
.
2. In a facsimile system
System
System is a set of interacting or interdependent components forming an integrated whole....
using frequency modulation
Frequency modulation
In telecommunications and signal processing, frequency modulation conveys information over a carrier wave by varying its instantaneous frequency. This contrasts with amplitude modulation, in which the amplitude of the carrier is varied while its frequency remains constant...
, recording in which the lowest received frequency corresponds to the maximum density of the record medium.
Source: Federal Standard 1037C
Federal Standard 1037C
Federal Standard 1037C, titled Telecommunications: Glossary of Telecommunication Terms is a United States Federal Standard, issued by the General Services Administration pursuant to the Federal Property and Administrative Services Act of 1949, as amended....
and MIL-STD-188
MIL-STD-188
MIL-STD-188 is a series of U.S. military standards relating to telecommunications.-Purpose:Faced with “past technical deficiencies in telecommunications systems and equipment and software…that were traced to basic inadequacies in the application of telecommunication standards and to the lack of a...