Receiving device for frequency-multiplexed signals
AssigneeSiemens Healthcare GmbH
InventorJan Bollenbeck
Life of this patent
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Abstract
A receiving device for two signals having different center frequencies. The receiving device includes a sampler. A first signal of the two signals and a second signal of the two signals are supplied to a first signal-input of the sampler in a time multiplex. The sampler digitizes the first signal and the second signal at a sampling rate. The receiving device also includes a frequency mirroring device that mirrors the second digital signal in a frequency domain about a quarter of the sampling rate.
Claims13
A receiving device for receiving a first signal having a first center frequency, and a second signal having a second center frequency, wherein the first center frequency differs from the second center frequency, wherein the receiving device is configured to receive the first signal and the second signal from a single cable by frequency multiplexing, the receiving device comprising:
- a sampler, wherein the receiving device is configured to supply the first signal and the second signal to a first signal-input of the sampler in a time multiplex,
- wherein the sampler is configured to digitize the time-multiplexed first and second signals into a first digital signal and a second digital signal at a sampling rate for output at a second signal-output;
- a filter configured to filter crosstalk products of the sampler for the first digital signal, the second digital signal, or the first digital signal and the second digital signal, a cutoff frequency of the filter being at a quarter of the sampling rate;
- and
- a frequency mirroring device configured to mirror the second digital signal about a quarter of the sampling rate,
- wherein a half sampling-rate or an integral multiple of the half sampling-rate lies between the first center frequency and the second center frequency.
A magnetic resonance tomograph comprising:
- a receiving device for a first signal having a first center frequency, and a second signal having a second center frequency, wherein the first center frequency differs from the second center frequency, the receiving device comprising:
- a sampler, wherein the receiving device is configured to supply the first signal and the second signal to a first signal-input of the sampler in a time multiplex, wherein the sampler is configured to digitize the time-multiplexed first and second signals into a first digital signal and a second digital signal at a sampling rate for output at a second signal-output;
- a frequency mirroring device configured to mirror the second digital signal about a quarter of the sampling rate, wherein a half sampling-rate or an integral multiple of the half sampling-rate lies between the first center frequency and the second center frequency;
- and
- a filter configured to filter crosstalk products of the sampler for the first digital signal, the second digital signal, or the first digital signal and the second digital signal, a cutoff frequency of the filter being at a quarter of the sampling rate;
- and
- a local-coil array having a plurality of antenna coils, the local-coil array being configured to transmit, over a signal connection, a plurality of magnetic resonance signals from the plurality of antenna coils in a frequency multiplex.
A method for operating a magnetic resonance tomograph, the magnetic resonance tomograph comprising a receiving device for receiving a first signal having a first center frequency, and a second signal having a second center frequency, wherein the first center frequency differs from the second center frequency, wherein the receiving device is configured to receive the first signal and the second signal from a single cable by frequency multiplexing, wherein the receiving device comprises a frequency mirroring device, a filter, and a sampler, wherein the first signal and the second signal are supplied to a first signal-input of the sampler in a time multiplex, the method comprising:
- digitizing the time-multiplexed first and second signals into a first digital signal and a second digital signal at a sampling rate, and
- filtering crosstalk products of the sampler for the first digital signal, the second digital signal, or the first digital signal and the second digital signal, a cutoff frequency of the filter being at a quarter of the sampling rate,
- wherein the second digital signal is mirrored in a frequency domain about a quarter of the sampling rate.
In a non-transitory computer-readable storage medium that stores instructions executable by a controller of a magnetic resonance tomograph to operate a magnetic resonance tomograph, the magnetic resonance tomograph comprising a receiving device for receiving a first signal having a first center frequency, and a second signal having a second center frequency, wherein the first center frequency differs from the second center frequency, wherein the receiving device is configured to receive the first signal and the second signal from a single cable by frequency multiplexing, wherein the receiving device comprises a frequency mirroring device, a filter, and a sampler, wherein the first signal and the second signal are supplied to a first signal-input of the sampler in a time multiplex, the instructions comprising:
- digitizing the time-multiplexed first and second signals into a first digital signal and a second digital signal at a sampling rate, and
- filtering crosstalk products of the sampler for the first digital signal, the second digital signal, or the first digital signal and the second digital signal, a cutoff frequency of the filter being at a quarter of the sampling rate,
- wherein the second digital signal is mirrored in a frequency domain about a quarter of the sampling rate.
Dependencies are inferred from the claim text.