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US4281346A
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Complementary pre-emphasis and de-emphasis circuits for a video signal transfer channel
Assignee: Emtec Magnetics GmbH
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Filing: 1979-07-12
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Granted: 1981-07-28
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Expires: 1999-07-12
Abstract
Abstract Complementary circuits for pre-emphasis and de-emphasis of video luminance signals, the circuits permitting an improved signal-to-noise ratio in a video signal transfer channel. The video signal has separate frequency- and amplitude-sensitive portions as well as a linear gain portion, thereby providing a fixed gain up to a predetermined lower frequency, a fixed response between this frequency and a variable upper frequency breakpoint, and an amplitude-dependent gain above the upper frequency breakpoint. De-emphasis is performed by a circuit also having separate frequency- and amplitude-sensitive portions and a linear gain portion, and which may be readily matched to the pre-emphasis circuit.
Inventors
- 👤 Caljon H. Strobele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:20
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N5/923; G; G11; G11B; G11B23/00; G11B23/0007; H03; H03G; H03G9/00; H03G9/02; H03G9/12; H03G9/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
180 words
In a wide band signal transfer system including a wide band signal transfer channel which is subject to unwanted noise across the wide band, pre-emphasis means for increasing, prior to introduction of said signal into said channel in pre-emphasized form, the amplitude of higher-frequency wide band signal components relative to lower frequency wide band signal components without overdriving of the transfer channel, said pre-emphasis means comprising: input connections for receiving a signal having a wide band of frequencies within a predetermined amplitude range; and amplifying means coupled to said input connections, the output of said amplifying means having connected thereto a network for producing a gain that is a direct function of frequency to a limit, said network comprising an inductance-resistance combination; and means in shunt connection with said inductance for switching the gain of said amplifying means for the amplitude peaks of said resultant amplified signal which exceed a predetermined magnitude, whereby the gain of said amplifying means is made a non-linear function of frequency and of the amplitude of the higher frequency components of said wide band signal.
Claim 2
Dependent Claim
180 words
In a wide band signal transfer system including a wide band signal transfer channel which is subject to unwanted noise across the wide band, pre-emphasis means for increasing, prior to introduction of said signal into said channel in pre-emphasized form, the amplitude of higher-frequency wide band signal components relative to lower frequency wide band signal components without overdriving of the transfer channel, said pre-emphasis means comprising: input connections for receiving a signal having a wide band of frequencies within a predetermined amplitude range; and amplifying means coupled to said input connections, the output of said amplifying means having connected thereto a network for producing a gain that is a direct function of frequency to a limit, said network comprising an inductance-resistance combination; and means in shunt connection with said inductance for switching the gain of said amplifying means for the amplitude peaks of said resultant amplified signal which exceed a predetermined magnitude, whereby the gain of said amplifying means is made a non-linear function of frequency and of the amplitude of the higher frequency components of said wide band signal.
Claim 3
Dependent Claim
53 words
In a wide band signal transfer system the pre-emphasis means as claimed in claim 1, wherein said inductance and said resistance are connected in parallel, and wherein the means in shunt connection include a pair of oppositely poled unidirectionally conducting devices connected, in series with resistive means, in parallel to said inductance-resistance combination.
Claim 4
Dependent Claim
195 words
In a wide band signal transfer system including a wide band signal transfer channel which is subject to unwanted noise across the wide band, pre-emphasis means for increasing, prior to introduction of said signal into said channel in pre-emphasized form, the amplitude of higher-frequency wide band signal components relative to lower-frequency wide band signal components without overdriving of the transfer channel, said pre-emphasis means comprising: input connections for receiving a signal having a wide band of frequencies within a predetermined amplitude range, and amplifying means coupled to said input connections, said amplifying means including means for subjecting frequency components of said wide band signal below a lower frequency limit to a gain which is independent of frequency and substantially independent of amplitude, and said amplifying means having a non-linear frequency-sensitive network connected thereto, for subjecting frequency components above said lower frequency limit to a frequency-dependent gain, and said amplifying means having a separate, amplitude-sensitive network connected thereto for attenuating the gain of the amplitude peaks of the signal which exceed a predetermined magnitude, the gain above the corresponding upper frequency limit being independent of frequency but dependent on the amplitude of said higher frequency components.
Claim 5
Dependent Claim
195 words
In a wide band signal transfer system including a wide band signal transfer channel which is subject to unwanted noise across the wide band, pre-emphasis means for increasing, prior to introduction of said signal into said channel in pre-emphasized form, the amplitude of higher-frequency wide band signal components relative to lower-frequency wide band signal components without overdriving of the transfer channel, said pre-emphasis means comprising: input connections for receiving a signal having a wide band of frequencies within a predetermined amplitude range, and amplifying means coupled to said input connections, said amplifying means including means for subjecting frequency components of said wide band signal below a lower frequency limit to a gain which is independent of frequency and substantially independent of amplitude, and said amplifying means having a non-linear frequency-sensitive network connected thereto, for subjecting frequency components above said lower frequency limit to a frequency-dependent gain, and said amplifying means having a separate, amplitude-sensitive network connected thereto for attenuating the gain of the amplitude peaks of the signal which exceed a predetermined magnitude, the gain above the corresponding upper frequency limit being independent of frequency but dependent on the amplitude of said higher frequency components.
References Cited (Backward Citations)
US3290433A
Cited
US3288930A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-27 | 1985-01-26 | 1985-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-27 | 1989-01-26 | 1989-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-27 | 1993-01-26 | 1993-07-28 | $7700.00 | Window Closed / Lapsed |