Method and apparatus for transmission of signals for an extended

Details Method and apparatus for transmission of signals for an extended Method and apparatus for transmission of signals for an extended

1991-08-12

1994-01-11

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358142, 358147, H04N 7087

Patent

active

052786498

ABSTRACT:
The black level of the NTSC portion of an EDTV broadcast signal is set to a level N, typically twice as high as the normal 7.5 IRE units. This signal characteristic motivates the viewer or the automatic black level circuits of the NTSC receiver to raise the receiver's black level to about the same N IRE units for optimum reception of the transmitted signal. EDTV enhancement signals are transmitted in the range of +N to -N (for example, +15 to -15) IRE units. Since the NTSC receiver is adjusted to blank all signals below N IRE, the EDTV enhancement signals between +N and -N IRE levels do not trigger the display in the NTSC receiver, thereby maintaining the upper and lower band areas at a uniform black level without unwarranted speckles or other interference.

REFERENCES:
patent: 5075773 (1991-12-01), Pullen et al.

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