Method and apparatus for compressing and decompressing sound field data of an area
AssigneesFraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V., Technische Universitaet IImenau
InventorsJohannes Nowak, Christoph Sladeczek
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Abstract
An apparatus for compressing sound field data of an area includes a divider for dividing the sound field data into a first portion and into a second portion, and a converter for converting the first portion and the second portion into harmonic components, wherein the converter is configured to convert the second portion into one or several harmonic components of a second order, and to convert the first portion into harmonic components of a first order, wherein the first order is higher than the second order, to obtain the compressed sound field data.
Claims22
Apparatus for compressing sound field data of an area, comprising:
- a divider for dividing the sound field data into a first portion and into a second portion;
- and
- a converter for converting the first portion and the second portion into harmonic components, wherein the converter is configured to convert the second portion into one or several harmonic components of a second order, and to convert the first portion into harmonic components of a first order, wherein the first order is higher than the second order, to acquire the compressed sound field data,
- wherein the divider is configured to perform spectral division and comprises a filterbank for filtering at least part of the sound field data for acquiring sound field data in different filterbank channels, and
- wherein the converter is configured to compute, for a subband signal from a first filterbank channel, which represents the first portion, of the different filterbank channels, the harmonic components of the first order, and to compute, for a subband signal from a second filterbank channel, which represents the second portion, of the different filterbank channels, the harmonic components of the second order, wherein a center frequency of the first filterbank channel is higher than a center frequency of the second filterbank channel.
Apparatus for decompressing compressed sound field data comprising first harmonic components up to a first order and one or several second harmonic components up to a second order, wherein the first order is higher than the second order, comprising:
- an input interface for acquiring the compressed sound field data;
- and
- a processor for processing the first harmonic components and the second harmonic components by using a combination of the first and the second portion and by using a conversion of a harmonic component representation into a time domain representation to acquire a decompressed illustration, wherein the first portion is represented by the first harmonic components and the second portion by the second harmonic components,
- wherein the first harmonic components of the first order represent a first spectral domain, and the one or the several harmonic components of the second order represent a different spectral domain,
- wherein the processor is configured to convert the harmonic components of the first order into the spectral domain and to convert the one or the several second harmonic components of the second order into the spectral domain, and to combine the converted harmonic components by means of a synthesis filterbank to acquire a representation of sound field data in the time domain.
Method for compressing sound field data of an area, comprising:
- dividing the sound field data into a first portion and into a second portion, and
- converting the first portion and the second portion into harmonic components,
- wherein the second portion is converted into one or several harmonic components of a second order, and wherein the first portion is converted into harmonic components of a first order, wherein the first order is higher than the second order, to acquire the compressed sound field data,
- wherein dividing comprises spectral division by filtering with a filterbank for filtering at least part of the sound field data for acquiring sound field data in different filterbank channels, and
- wherein converting represents a computation of the harmonic components of the first order for a subband signal from a first filterbank channel, which represents the first portion, of the different filterbank channels, and a computation of the harmonic components of the second order for a subband signal from a second filterbank channel, which represents the second portion, of the different filterbank channels, wherein a center frequency of the first filterbank channel is higher than a center frequency of the second filterbank channel.
Method for decompressing compressed sound field data comprising first harmonic components up to a first order and one or several second harmonic components up to a second order, wherein the first order is higher than the second order, comprising:
- acquiring the compressed sound field data;
- and
- processing the first harmonic components and the second harmonic components by using a combination of the first and second portions and by using a conversion from a harmonic component representation into a time domain representation to acquire a decompressed representation, wherein the first portion is represented by the first harmonic components and the second portion by the second harmonic components,
- wherein the first harmonic components of the first order represent a first spectral domain, and the one or the several harmonic components of the second order represent a different spectral domain,
- wherein processing comprises converting the first harmonic components of the first order into the spectral domain and converting the one or the several second harmonic components of the second order into the spectral domain and combining the converted harmonic components by means of a synthesis filterbank to acquire a representation of sound field data in the time domain.
A non-transitory digital storage medium having a computer program stored thereon to perform the method for compressing sound field data of an area, the method comprising:
- dividing the sound field data into a first portion and into a second portion, and
- converting the first portion and the second portion into harmonic components, wherein the second portion is converted into one or several harmonic components of a second order, and wherein the first portion is converted into harmonic components of a first order, wherein the first order is higher than the second order, to acquire the compressed sound field data,
- wherein dividing comprises spectral division by filtering with a filterbank for filtering at least part of the sound field data for acquiring sound field data in different filterbank channels, and
- wherein converting represents a computation of the harmonic components of the first order for a subband signal from a first filterbank channel, which represents the first portion, of the different filterbank channels, and a computation of the harmonic components of the second order for a subband signal from a second filterbank channel, which represents the second portion, of the different filterbank channels, wherein a center frequency of the first filterbank channel is higher than a center frequency of the second filterbank channel,
- when said computer program is run by a computer.
A non-transitory digital storage medium having a computer program stored thereon to perform the method for decompressing compressed sound field data comprising first harmonic components up to a first order and one or several second harmonic components up to a second order, wherein the first order is higher than the second order, the method comprising:
- acquiring the compressed sound field data;
- and
- processing the first harmonic components and the second harmonic components by using a combination of the first and second portions and by using a conversion from a harmonic component representation into a time domain representation to acquire a decompressed representation, wherein the first portion is represented by the first harmonic components and the second portion by the second harmonic components,
- wherein the first harmonic components of the first order represent a first spectral domain, and the one or the several harmonic components of the second order represent a different spectral domain,
- wherein processing comprises converting the first harmonic components of the first order into the spectral domain and converting the one or the several second harmonic components of the second order into the spectral domain and combining the converted harmonic components by means of a synthesis filterbank to acquire a representation of sound field data in the time domain,
- when said computer program is run by a computer.
Dependencies are inferred from the claim text.