Signal processor
A signal processor comprising: a modelling block, configured to receive a frequency-domain-input-signal, a fundamental-frequency-signal representative of a fundamental frequency of the frequency-domain-input-signal; and configured to provide a pitch-model-signal based on a periodic function, the pitch-model-signal spanning a plurality of discrete frequency bins, each discrete frequency bin having a respective discrete frequency bin index, wherein within each discrete frequency bin the pitch-model-signal is defined by: the periodic function; the fundamental frequency; the frequency-domain-input-signal; and the respective discrete frequency bin index. The signal processor further comprises a manipulation block, configured to provide an output-signal based on the frequency-domain-input-signal and the pitch-model-signal.
1. A signal processor comprising:
a modelling block, comprising
a modelling-block-input-signal-terminal configured to receive a frequency-domain-input-signal;
a fundamental-frequency-input-terminal configured to receive a fundamental-frequency-signal representative of a fundamental frequency of the frequency-domain-input-signal; and
a modelling-output-terminal, configured to provide a pitch-model-signal based on a periodic function, the pitch-model-signal spanning a plurality of discrete frequency bins, each discrete frequency bin having a respective discrete frequency bin index,
wherein within each discrete frequency bin the pitch-model-signal is defined by:
the periodic function;
the fundamental frequency;
the frequency-domain-input-signal; and
the respective discrete frequency bin index,
a manipulation block, comprising:
a manipulation-block-input-signal-terminal configured to receive the frequency-domain-input-signal;
a model-input-terminal configured to receive the pitch-model-signal from the modelling block; and
an output-terminal,
wherein the manipulation block is configured to provide an output-signal, to the output-terminal, based on the frequency-domain-input-signal and the pitch-model-signal; and
wherein the pitch-model-signal comprises an offset, added to the periodic function, for each discrete frequency bin,
each respective offset determined in accordance with the frequency-domain-input-signal.
2. The signal processor of claim 1 ,
wherein the pitch-model-signal comprises an amplitude for each discrete frequency bin,
each respective amplitude determined in accordance with the frequency-domain-input-signal.
3. The signal processor of claim 1 ,
wherein the pitch-model-signal is limited to an upper maximum value for each discrete frequency bin,
each respective upper maximum value determined in accordance with the frequency-domain-input-signal.
4. The signal processor of claim 1 ,
wherein the pitch-model-signal is limited to a lower minimum value for each discrete frequency bin,
each respective lower minimum value determined in accordance with the frequency-domain-input-signal.
5. The signal processor of claim 1 ,
wherein the pitch-model-signal is based on a modulus of the periodic function exponentiated to a power for each discrete frequency bin,
each respective power determined in accordance with the frequency-domain-input-signal.
6. The signal processor of claim 1 ,
wherein the pitch-model-signal comprises a frequency-offset determined in accordance with the frequency-domain-input-signal.
7. The signal processor of claim 1 ,
wherein the pitch-model-signal comprises a frequency-offset for each discrete frequency bin,
each respective frequency-offset determined in accordance with the frequency-domain-input-signal.
8. The signal processor of claim 1 ,
wherein the periodic function is a cosine function.
9. The signal processor of claim 1 , further comprising an a-priori-signal-to-noise-ratio-estimation block, comprising:
a noise-power-estimate-terminal, configured to receive a noise-power-estimate-signal based on the frequency-domain-input-signal;
a manipulation-input-terminal coupled to the output-terminal of the manipulation block and configured to receive the output-signal; and
an a-priori-signal-to-noise-ratio-estimation-output terminal, configured to provide an a-priori-signal-to-noise-ratio-estimation-signal based on the noise-power-estimate-signal and the output-signal.
10. The signal processor of claim 1 ,
wherein the manipulation block further comprises an envelope-estimation-block configured to receive the frequency-domain-input-signal and determine an envelope-signal based on the frequency-domain-input-signal and predetermined-envelope-data, and
wherein the manipulation block is configured to provide the output-signal based on a combination of the pitch-model-signal and the envelope-signal.
11. The signal processor of claim 10 ,
wherein the manipulation block is configured to provide the output-signal based on a product of the envelope-signal with the pitch-model-signal for a selected subset of the plurality of discrete frequency bins.
12. The signal processor of claim 11 ,
wherein the selected subset of the plurality of discrete frequency bins relate to frequencies that exceed a bandwidth of the frequency-domain-input-signal.
13. A computer program, including a non-transitory, tangible machine readable storage medium containing executable machine instructions which when run on a computer, causes the computer to configure a signal processor of claim 1 .
14. A method of signal processing comprising:
receiving a frequency-domain-input-signal;
receiving a fundamental-frequency-signal representative of a fundamental frequency of the frequency-domain-input-signal; and
providing a pitch-model-signal based on a periodic function, the pitch-model-signal spanning a plurality of discrete frequency bins, each discrete frequency bin having a respective discrete frequency bin index,
wherein within each discrete frequency bin the pitch-model-signal is defined by:
the periodic function;
the fundamental frequency;
the frequency-domain-input-signal; and
the respective discrete frequency bin index,
receiving the frequency-domain-input-signal;
receiving the pitch-model-signal; and
providing an output-signal based on the frequency-domain-input-signal and the pitch-model-signal
wherein the pitch-model-signal includes an offset, added to the periodic function, for each discrete frequency bin,
each respective offset determined in accordance with the frequency-domain-input-signal.
15. A signal processor comprising:
a modelling block, comprising
a modelling-block-input-signal-terminal configured to receive a frequency-domain-input-signal;
a fundamental-frequency-input-terminal configured to receive a fundamental-frequency-signal representative of a fundamental frequency of the frequency-domain-input-signal; and
a modelling-output-terminal, configured to provide a pitch-model-signal based on a periodic function, the pitch-model-signal spanning a plurality of discrete frequency bins, each discrete frequency bin having a respective discrete frequency bin index,
wherein within each discrete frequency bin the pitch-model-signal is defined by:
the periodic function;
the fundamental frequency;
the frequency-domain-input-signal; and
the respective discrete frequency bin index,
a manipulation block, comprising:
a manipulation-block-input-signal-terminal configured to receive the frequency-domain-input-signal;
a model-input-terminal configured to receive the pitch-model-signal from the modelling block; and
an output-terminal,
wherein the manipulation block is configured to provide an output-signal, to the output-terminal, based on the frequency-domain-input-signal and the pitch-model-signal; and
wherein the pitch-model-signal is limited to either,
an upper maximum value for each discrete frequency bin, each respective upper maximum value determined in accordance with the frequency-domain-input-signal, or
a lower minimum value for each discrete frequency bin, each respective lower minimum value determined in accordance with the frequency-domain-input-signal.