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SAA4974H Datasheet(PDF) 11 Page - NXP Semiconductors |
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SAA4974H Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 28 page 1998 Apr 21 11 Philips Semiconductors Product specification Besic without ADC SAA4974H 7.1.3 Y-PEAKING A linear peaking is applied, which amplifies the luminance signal in the middle and the upper ranges of the bandwidth. The filtering is an addition of: • The original signal • The original signal band-passed with centre frequency = 1 ⁄4fs • The original signal high-passed with maximum gain at frequency = 1 ⁄2fs. The band-passed and high-passed signals are weighted with factors 0, 1 ⁄8, 1⁄4 and 1⁄2. The impulse response becomes [ −α, −β, 1 + 2α +2β, −β, −α], where α is the band-pass weighting factor and β the high-pass weighting factor. Coring is added to obtain no gain for low amplitudes in the (high-pass + band-pass) signal, which is then considered to be noise. Coring levels can be programmed as 0 (off), +1/ −2, +3/−4 and +7/−8 LSB at 8-bit word. Fig.7 Peaking transfer function with variation of β ( α = 1⁄8). (1) β = 1⁄2. (2) β = 1⁄4. (3) β = 1⁄8. (4) β =0. handbook, halfpage 0 0 2 4 6 8 10 12 1/4fs 1/2fs MGE097 IH_PeakingI (dB) (1) (2) (3) (4) Fig.8 Peaking transfer function with variation of β ( α = 1⁄4). (1) β = 1⁄2. (2) β = 1⁄4. (3) β = 1⁄8. (4) β =0. handbook, halfpage 0 0 2 4 6 8 10 12 1/4fs 1/2fs MGE098 IH_PeakingI (dB) (1) (2) (3) (4) |
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