Method for coding and decoding impulse responses of audio signals
AssigneeThomson Licensing
InventorsJürgen Schmidt, Klaus Eilts-Grimm
Life of this patent
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Abstract
The transmission and use of real, i. e. of measured, room impulse responses for the reproduction of sound signals with this room characteristic compatible to the MPEG-4 standard is made possible by inserting impulse responses in multiple successive control parameter fields, especially the params[128] array. A first control parameter field contains information about the number and content of the following fields. For presentation of the sound signals the content of the successive control parameter fields is separated, stored in an additional memory of a node and used during the calculation of the room characteristic.
Claims9
Method for coding impulse responses of audio signals, wherein said impulse responses allow reproduction of sound signals corresponding to a certain room characteristic, comprising:
- using an MPEG-4 encoder to encode multiple successive MPEG-4 PROTO params fields of an MPEG-4 BIFS stream for transmission of one or more impulse responses associated with a coded audio signal as defined in the following steps:
- inserting into a first of said multiple successive MPEG-4 PROTO params fields information about the following MPEG-4 PROTO params fields by said MPEG-4 encoder, wherein said information comprises a number of the following MPEG-4 PROTO params fields to be used and a number of impulse responses to be transmitted;
- and
- inserting into said following MPEG-4 PROTO params fields for each of said impulse responses a length information of the impulse response and samples representing the impulse response.
Method for decoding impulse responses of audio signals by an MPEG-4 decoder, wherein said impulse responses allow reproduction of sound signals corresponding to a certain room characteristic, comprising:
- receiving, at an MPEG-4 decoder, one or more impulse responses in multiple successive MPEG-4 PROTO params fields of an MPEG-4 BIFS stream, wherein a first of said multiple successive MPEG-4 PROTO params fields includes information about the following MPEG-4 PROTO params fields, said information comprising a number of the following MPEG-4 PROTO params fields used and a number of impulse responses transmitted, and wherein said following MPEG-4 PROTO params fields include for each of said impulse responses a length information of the impulse response and samples representing the impulse response;
- separating said samples representing said one or more impulse responses based on said information in said first MPEG-4 PROTO params field and said length information in said following MPEG-4 PROTO params fields by said MPEG-4 decoder;
- and
- using said one or more impulse responses represented by said separated samples for calculation by said MPEG-4 decoder of a reverberation effect corresponding to said room characteristic.
Apparatus for coding impulse responses of audio signals, wherein the impulse responses allow reproduction of sound signals corresponding to a certain room characteristic, comprising;
- an MPEG-4 encoder that encodes multiple successive MPEG-4 PROTO params fields of an MPEG-4 BIFS stream for transmission of one or more impulse responses associated with a coded audio signal, said MPEG-4 encoder
- inserts into a first of said multiple successive MPEG-4 PROTO params fields information about the following MPEG-4 PROTO params fields by said MPEG-4 encoder, wherein said information comprises a number of the following MPEG-4 PROTO params fields to be used and a number of impulse responses to be transmitted;
- and
- inserts into said following MPEG-4 PROTO params fields for each of said impulse responses a length information of the impulse response and samples representing the impulse response.
Dependencies are inferred from the claim text.