Patent US6115488A successfully refreshed from Google Patents.
US4477916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmitter for angle-modulated signals
Assignee: US Philips Corp
•
Filing: 1982-03-11
•
Granted: 1984-10-16
•
Expires: 2002-03-11
Abstract
Abstract Transmitter for angle-modulated signals having an input for binary signals, a premodulation filter and a frequency modulation arrangement. In order to improve the error rate of the system of transmitter and receiver a premodulation filter is used having a pulse response h(t): ##EQU1## wherein g(t) is the pulse response of a Gaussian low-pass filter and T the duration of a binary signal element. The postdemodulation filter 6-4 (6-5) has a pulse response of the same general form for optimum results.
Inventors
- 👤 Kah-Seng Chung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:41
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/18; H04L27/20; H04L27/2003; H04L27/2007; H04L27/2017
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
107 words
In a transmitter for angle-modulated signals having an input for synchronous binary signals, a premodulation filter connected to said input, and a frequency modulation arrangement connected to the output of the filter and serving to provide, in response to an input signal voltage, and output signal at a frequency which linearly depends on the amplitude of said input signal voltage; the improvement wherein the premodulation filter has a pulse response h(t) in accordance with the expression: ##EQU4## wherein g(t) is the pulse response of a Gaussian low-pass filter, T is a delay time equal to the duration of a binary signal element and n is an integer.
Claim 2
Dependent Claim
107 words
In a transmitter for angle-modulated signals having an input for synchronous binary signals, a premodulation filter connected to said input, and a frequency modulation arrangement connected to the output of the filter and serving to provide, in response to an input signal voltage, and output signal at a frequency which linearly depends on the amplitude of said input signal voltage; the improvement wherein the premodulation filter has a pulse response h(t) in accordance with the expression: ##EQU4## wherein g(t) is the pulse response of a Gaussian low-pass filter, T is a delay time equal to the duration of a binary signal element and n is an integer.
Claim 3
Dependent Claim
20 words
The transmitter of claim 1 wherein said premodulation filter comprises a Gaussian low-pass filter and a correction filter in series.
Claim 4
Dependent Claim
62 words
The transmitter of claim 2 wherein said correction filter comprises a series connection of a plurality of delay sections each having a delay representing the duration of one symbol period of a binary input signal applied to said input, signal summing means, and separate multiplier means for multiplying the outputs of said delay means and applying them to said signal summing means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-16 | 1988-04-16 | 1988-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-16 | 1992-04-16 | 1992-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-16 | 1996-04-16 | 1996-10-16 | $7700.00 | Window Closed / Lapsed |