Patent EP0540330A2 successfully refreshed from Google Patents.
EP0540330A2
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EP
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Procedure for decoding an audio signal in which other information has been included in said audiosignal by making use of masking effect
Assignee: Nokia Technologies Oy
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Filing: 1992-10-29
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Granted: —
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Expires: 2012-10-29
Abstract
Abstract A property of the hearing system, i.e. masking effect, can be utilized, as is known in the art, so that to any audio signal a second, weaker signal can be added inaudibly. In a system of prior art employing said principle an analysis of the audio signal and calculation of the masking threshold are carried out both in the transmitter and the receiver. This operation results in a complicated decoder and on certain occasions, audible distortion in a repeated audio signal. According to the present invention this can be so avoided that the transmitter transmits all data required in decoding on a separate data channel. Hereby, the decoder operates under the control of the transmitter.
Inventors
- 👤 Aki Makivirta
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 18:12
CPC Classifications
G; G10; G10L; G10L19/00; G10L19/018; H; H04; H04B; H04B1/00; H04B1/66; H04B1/665
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
148 words
A method for combining an audio signal and a data signal in an encoder and for transmission of the same on an audio channel, in which encoder - an audio signal incoming in sample sequence form is divided into subbands, - a masking threshold is simultaneously calculated in each subband for a sample cluster of equal size, the sounds below which are not audible to the human ear, - the bits of the samples remaining below the masking threshold are replaced by the bits of the data signal, and - the subbands are combined, whereby a combined signal for transmission on the audio channel is obtained, characterized in that all the information is gathered in the encoder that is required for separating the combined signal again, and said information in the form of side information is simultaneously transmitted on a separate data channel together with the combined signal.
Claim 2
Dependent Claim
22 words
Method according to claim 1, characterized in that merely the quantization data of the audio signal is transmitted as the side information.
Claim 3
Dependent Claim
37 words
Method according to claim 2, characterized in that said side information contains the data concerning the data mode illustrating the arrangements for maximizing the amount of the hidden data, and the reconstruction data of the data signal.
Claim 4
Dependent Claim
21 words
Method according to claim 2, characterized in that the side information also contains part of the information of the data signal.
Claim 5
Dependent Claim
31 words
Method according to claim 2, characterized in that the side information also contains the dematrixing data when the audio signal is a signal generated from a surround sound signal by matrixing.
Claim 6
Dependent Claim
107 words
Method according to claim 1 for separating a combined audio signal and a data signal in a decoder, in which - an audio signal entering in sample sequence form is divided into subbands, - the bits remaining below the masking threshold are separated from the audio signal, and - said separated bits are combined, whereby a data signal transmitted on the audio channel is obtained, characterized in that such information is received on a separate data channel in the form of side information which is required for separating the data signal from the audio signal, whereby the decoder carries out said separation operation controlled by the encoder.
Claim 7
Dependent Claim
21 words
Method according to claim 6, characterized in that merely the quantization data of the audio signal is received as side information.
Claim 8
Dependent Claim
28 words
Method according to claim 7, characterized in that the information on the data mode and on the reconstruction the data signal is included in the side information received.
Claim 9
Dependent Claim
22 words
Method according to claim 7, characterized in that the received side information also contains part of the information concerning the data signal.
Claim 10
Dependent Claim
33 words
Method according to claim 7, characterized in that when the audio signal is a signal generated by matrixing from a multichannel sound signal, also the dematrixing information is included in the side information.
Claim 11
Dependent Claim
35 words
Encoder and decoder according to any one of the preceding claims, characterized in that they are used for transmission of a surround sound signal in a television system in which digital sound transfer is used.
References Cited (Backward Citations)
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