Patent JPS5870664A successfully refreshed from Google Patents.
Patent JPS5356018A successfully refreshed from Google Patents.
Patent EP0323675A1 successfully refreshed from Google Patents.
EP0323675A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
An arrangement for generating an SSB signal
Assignee: Philips Electronics UK Ltd
•
Filing: 1988-12-27
•
Granted: —
•
Expires: 2008-12-27
Abstract
Abstract An SSB generator in which a digitised analogue signal is processed in accordance with Weaver's method. The baseband I and Q signals are interpolated at a sampling frequency f s in respective first interpolators (30, 32). The interpolated signals are frequency up-converted to an output SSB carrier frequency Nf s by applying said signals to respective second interpolators (38, 40) in which the signals are sampled at 4Nf s . The samples at the outputs of the second interpolators (38, 40) are applied to a multiplexer (42) which provides a digitised version of the SSB signal which is converted to an analogue signal and filtered.
Inventors
- 👤 Mustafa Kubilay Gurcan
- 👤 Anne Watteau
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 16:32
CPC Classifications
H; H03; H03C; H03C1/00; H03C1/52; H03C1/60; H03C2200/00; H03C2200/0037; H03C2200/0058; H03C2200/007
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
57 words
An SSB generator comprising means for providing quadrature related digitised first and second input signals at baseband frequencies, interpolating means for frequency up-converting said first and second signals, and multiplexing means coupled to the interpolating means for multiplexing the frequency up-converted first and second input signals to provide a digitised SSB signal having a desired carrier frequency.
Claim 2
Dependent Claim
57 words
An SSB generator comprising means for providing quadrature related digitised first and second input signals at baseband frequencies, interpolating means for frequency up-converting said first and second signals, and multiplexing means coupled to the interpolating means for multiplexing the frequency up-converted first and second input signals to provide a digitised SSB signal having a desired carrier frequency.
Claim 3
Dependent Claim
89 words
An SSB generator as claimed in Claim 1, characterised in that the interpolating means comprises first and second interpolating means, the first interpolating means serving to sample respectively the first and second signals at a frequency (f s ) greater than the digitising frequency and the second interpolating means serving to sample the signals from the first interpolating means at a multiple of the first mentioned sampling frequency, and in that the multiplexing means is arranged to multiplex the samples at the sampling frequency of the second interpolating means.
Claim 4
Dependent Claim
61 words
An SSB generator as claimed in Claim 2, characterised in that the second interpolating means samples the signals at the output of the first interpolating means at a frequency 4N times the first mentioned sampling frequency, that is at 4Nf s , and in that the multiplexing means is operated at 4Nfs to provide an output signal at Nf s .
Claim 5
Dependent Claim
37 words
An SSB generator as claimed in Claim 2 or 3, characterised in that a digital to analogue converter (DAC) is coupled to the multiplexing means and a low pass filter connected to the output of the DAC.
Claim 6
Dependent Claim
61 words
An SSB generator as claimed in Claim 4, characterised in that a third interpolating means is connected to an output of the multiplexing means, the third interpolating means being operated at a sampling frequency greater than the sampling frequency of the second interpolating means in order to place the interpolated latter sampling frequency outside the bandwidth of the low pass filter.
Claim 7
Dependent Claim
91 words
An SSB generator as claimed in any one of Claims 2 to 5, characterised in that the second interpolating means comprises means for implementing the equation y = ax₁ + bx₂ = x₂ + n (x₁ - x₂)/N where x₁ and x₂ are samples separated in time by 1/f s of the impulse response of a filter, (x₁ - x₂) is the difference in amplitude of the two samples and N is the multiple of the sampling frequency (f s ) of the first interpolating means to obtain the SSB signal.
Claim 8
Dependent Claim
60 words
An SSB generator as claimed in any one of Claims 2 to 5, characterised in that the second interpolating means is arranged to operate on odd numbered samples of one of the quadrature related signals received from the first interpolating means and on even numbered samples of the other of the quadrature related signals received from the first interpolating means.
Claim 9
Dependent Claim
134 words
An SSB generator as claimed in Claim 7, characterised in that the second interpolating means comprises means for implementing the interpolation equations y I = X₂ I + 2n (x₁ I -x₂ I )/4N and y Q = x₂ Q + (2n+1) (x₁ Q -x₂ Q /4N where y I and y Q are the quadrature related signals produced by the second interpolating means, x₁ I , x₂ I and x₁ Q , X₂ Q are samples separated in time by 1/f s of the impulse response of the filter, (x₁ I -x₂ I ) and (x₁ Q -x₂ Q ) are the differences in amplitude between the respective pairs of samples and N is the multiple of the sampling frequency (f s ) of the first interpolating means to obtain the SSB signal.
Claim 10
Dependent Claim
71 words
An SSB generator as claimed in Claim 6, 7 or 8, characterised in that the second interpolating means comprises, for each of the quadrature related signals, shift register means, means for sampling the amplitude of the bits stored, differencing means for obtaining the difference between the amplitudes of two bits separated in time by 1/f s , and means for adding the difference obtained to the amplitude of the second sample.
Claim 11
Dependent Claim
56 words
An SSB generator as claimed in any one of Claims 2 to 9, characterised in that the multiplexing means comprises means for providing the samples at the higher sampling frequency of the respective quadrature related signals and the inverted values of said respective quadrature related signals and means for scanning said sample and said inverted values.
References Cited (Backward Citations)
US3997773A
Cited
US4086536A
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.