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US 9,913,060 B2Granted
Stereo reproduction apparatus
AssigneePanasonic Intellectual Property Corporation of America
InventorHiroki Furukawa
Life of this patent
Estimating the term…
Abstract
A right expected value generator generates an expected value of a right channel spectrum from the right channel spectrum. Further, a left expected value generator generates an expected value of a left channel spectrum from the left channel spectrum. Further, a right channel spectrum corrector so corrects a right channel spectrum outputted from a second synthesizer that the right channel spectrum does not exceed the expected value of the right channel spectrum. Moreover, a left channel spectrum corrector so corrects a left channel spectrum outputted from the second synthesizer that the left channel spectrum does not exceed the expected value of the left channel spectrum.
Claims8
A stereo reproduction apparatus for reproducing an FM stereo signal containing a stereo sum signal and a stereo difference signal, the stereo reproduction apparatus comprising:
- a processor;
- and
- a memory storing a computer program, which when executed by the processor, causes the processor to perform operations including:
- converting the stereo sum signal from a time domain into a frequency domain;
- converting the stereo difference signal from the time domain into the frequency domain;
- eliminating a noise component from the converted stereo difference signal;
- combining the converted stereo sum signal and the converted stereo difference signal to output left channel spectrum and right channel spectrum;
- generating left channel expected value from the left channel spectrum and right channel expected value from the right channel spectrum;
- combining the converted stereo sum signal and the converted stereo difference signal from which the noise component has been eliminated to output (i) the left channel spectrum from which the noise component has been eliminated and (ii) the right channel spectrum from which the noise component has been eliminated;
- correcting the left channel spectrum from which the noise component has been eliminated so as not to exceed the left channel expected value;
- correcting the right channel spectrum from which the noise component has been eliminated so as not to exceed the right channel expected value;
- reverse-converting the corrected left channel spectrum from the frequency domain into the time domain;
- and
- reverse-converting the corrected right channel spectrum from the frequency domain into the time domain.
11 more elements
A stereo reproduction apparatus for reproducing an FM stereo signal containing a stereo sum signal and a stereo difference signal, the stereo reproduction apparatus comprising:
- a processor;
- and
- a memory storing a computer program, which when executed by the processor, causes the processor to perform operations including:
- converting the stereo sum signal from a time domain into a frequency domain;
- converting the stereo difference signal from the time domain into the frequency domain;
- eliminating a noise component from the converted stereo difference signal;
- combining the converted stereo sum signal and the converted stereo difference signal to output left channel spectrum and right channel spectrum;
- generating left channel expected value from the left channel spectrum and right channel expected value from the right channel spectrum;
- combining the converted stereo sum signal and the converted stereo difference signal from which the noise component has been eliminated to output (i) the left channel spectrum from which the noise component has been eliminated and (ii) the right channel spectrum from which the noise component has been eliminated;
- correcting the left channel spectrum from which the noise component has been eliminated so as not to exceed the left channel expected value;
- correcting the right channel spectrum from which the noise component has been eliminated so as not to exceed the right channel expected value;
- low-pass processing the corrected left channel spectrum and the corrected right channel spectrum by a low-pass characteristic according to a receiving electric-field strength of the FM stereo signal;
- high-pass processing the converted stereo sum signal by a high-pass characteristic according to the receiving electric-field strength so as to compensate a reduction of the left channel spectrum and a reduction of the right channel spectrum by the low-pass processing;
- adding the high-pass processed stereo sum signal to the low-pass processed left channel spectrum and the low-pass processed right channel spectrum;
- reverse-converting the added left channel spectrum from the frequency domain into the time domain;
- and
- reverse-converting the added right channel spectrum from the frequency domain into the time domain.
14 more elements
A stereo reproduction apparatus for reproducing an FM stereo signal, the stereo reproduction apparatus comprising:
- a processor;
- and
- a memory storing a computer program, which when executed by the processor, causes the processor to perform operations including:
- converting a left channel signal contained in the FM stereo signal from a time domain into a frequency domain and outputting a left channel spectrum;
- converting a right channel signal contained in the FM stereo signal from the time domain into the frequency domain and outputting a right channel spectrum;
- eliminating a noise component from the left channel spectrum;
- eliminating a noise component from the right channel spectrum;
- generating an addition spectrum by adding the left channel spectrum and right the right channel spectrum;
- low-pass processing the left channel spectrum from which the noise components have been eliminated and the right channel spectrum by a low-pass characteristic according to a receiving electric-field strength of the FM stereo signal;
- high-pass processing the addition spectrum by a high-pass characteristic according to the receiving electric-field strength so as to compensate a reduction of the left channel spectrum due to the low-pass processes and a reduction of the right channel spectrum due to the low-pass processes;
- adding the high-pass processed addition spectrum to the low-pass processed left channel spectrum and the low-pass processed right channel spectrum;
- reverse-converting the added left channel spectrum from the frequency domain into the time domain;
- and
- reverse-converting the added right channel spectrum from the frequency domain into the time domain.
11 more elements
Dependencies are inferred from the claim text.