Signal coding

• US 20050021326A1
• Filed: 11/13/2002
• Published: 01/27/2005
• Est. Priority Date: 11/30/2001
• Status: Active Grant

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Schuijers, Erik Gosuinus Petru, Oomen, Arnoldus Werner Johannes
• Granted Patent: US 7,376,555 B2
• Time in Patent Office: Days
• US Class Current: 704/211
• CPC Class Codes: G10L 19/022 Blocking, i.e. grouping of samples in time; Choice of analysis windows; Overlap factoring

Abstract

Coding a signal is provided, wherein a first set of values is provided related to subsequent times in a first time interval of the signal, a second set of values is provided related to subsequent times in a second time interval of the signal, the first time interval having an overlap with the second time interval, the overlap including at least two subsequent times of the second interval, wherein at least one of the values of the second set related to the at least two subsequent times in the overlap is encoded with reference to a value of the first set which is closer in time to the at least one value of the second set than any other value in the second set.

Claims

1. A method of coding a signal, the method comprising:

providing a first set of values related to subsequent times in a first time interval of the signal,

providing a second set of values related to subsequent times in a second time interval of the signal,

the first time interval having an overlap with the second time interval, the overlap including at least two subsequent times of the second interval,

wherein at least one of the values of the second set related to the at least two subsequent times in the overlap is encoded with reference to a value of the first set which is closer in time to the at least one value of the second set than any other value in the second set.

2. A method as claimed in claim 1, wherein the overlap includes at least two times of the first time interval.

3. A method as claimed in claim 1, wherein g(i,b) are the values in the first set i and g(i+1,b) the values in the second set i+1, wherein b denotes the serial number of a given value in a given set, subsequent serial numbers being related to subsequent times,

the overlap including k times of the second time interval,

wherein the values g(i,b) of the first set and of the values g(i+1,b) of the second set are encoded in the sequence:

. . . g(i,n−

k) g(i,n−

k+1) g(i+1,1) g(i,n−

k+2) g(i+1,2) . . . g(i,n) g(i+1,k) g(i+1,k+1) g(i+1,k+2) . . . , wherein n is the highest serial number in the first set.

4. A method as claimed in claim 1, wherein g(i,b) are the values in the first set i and g(i+1,b) the values in the second set i+1, wherein b denotes the serial number of a given value in a given set, subsequent serial numbers being related to subsequent times,

the overlap including k times of the second time interval, wherein the coding comprises:

encoding the sequence . . . g(i,n−

k) g(i, n−

k+1) g(i,n−

k+2) . . . g(i,n)

encoding the sequence of inter-frame differences g(i+1,1)-g(i,n−

k+1), g(i+1,2)-g(i,n−

k+2) . . . g(i+1,k)-g(i,n), wherein n is the highest serial number in the first set.

5. A method as claimed in claim 4, wherein a mean m(i+1) of the inter-frame differences is determined and wherein the respective inter-frame differences are encoded as differences to said mean.

6. A method as claimed in claim 1, wherein a number of times in the first time interval in the overlap is equal to a number of times in the second time interval in the overlap.

7. A method as claimed in claim 1, wherein the values are values of a same type of parameter.

8. A method as claimed in claim 1, wherein the values are included in respective frames or sub-frames.

9. A method as claimed in claim 1, wherein the encoding is a differential encoding.

10. A method as claimed in claim 1, wherein the signal is an audio signal.

11. A method as claimed in claim 10, wherein the values are gain values of a noise component in the audio signal.

12. An encoder for coding a signal, the encoder comprising:

means for providing a first set of values related to subsequent times in a first time interval of the signal,

means for providing a second set of values related to subsequent times in a second time interval of the signal,

the first time interval having an overlap with the second time interval, the overlap including at least two subsequent times of the second interval,

the device further comprising means for encoding at least one of the values of the second set related to the at least two subsequent times in the overlap with reference to a value of the first set which is closer in time to the at least one value of the second set than any other value in the second set.

17. (original) A transmitter comprising:

an input unit (10) for receiving a signal,

an encoder (11) as claimed in claim 12 for encoding the signal (S) to obtain a an encoded signal ([S]), and

an output unit for providing a bit-stream representing the encoded signal ([S]).

19. A system comprising a transmitter as claimed in claim 17 and a receiver.

13. A bit-stream representing an encoded signal, the bit-stream comprising:

a first set of encoded values related to subsequent times in a first time interval,

a second set of encoded values related to subsequent times in a second time interval,

the first time interval having an overlap with the second time interval, the overlap including at least two subsequent times of the second interval,

wherein at least one of the values of the second set related to the at least two subsequent times in the overlap has been encoded with reference to a value of the first set which is closer in time to the at least one value of the second set than any other value in the second set.

14. A storage medium having stored thereon a bit-stream as claimed in claim 13.

15. A method of decoding a bit-stream representing an encoded signal, the decoding comprising:

receiving a first set of encoded values related to subsequent times in a first time interval,

receiving a second set of encoded values related to subsequent times in a second time interval,

the first time interval having an overlap with the second time interval, the overlap including at least two subsequent times of the second interval,

wherein at least one of the values of the second set related to the at least two subsequent times in the overlap has been encoded with reference to a value of the first set which is closer in time to the at least one value of the second set than any other value in the second set, the decoding further comprising;

decoding the first set of values to obtain a first set of decoded values, and

decoding the second set of values to obtain a second set of decoded values, the at least one of the values of the second set related to the at least two subsequent times in the overlap being decoded with reference to the value of the first set which is closer in time to the at least one value of the second set than any other value in the second set.

16. A decoder for decoding a bit-stream representing an encoded signal, the decoder comprising:

means for receiving a first set of encoded values related to subsequent times in a first time interval,

means for receiving a second set of encoded values related to subsequent times in a second time interval,

the first time interval having an overlap with the second time interval, the overlap including at least two subsequent times of the second interval,

wherein at least one of the values of the second set related to the at least two subsequent times in the overlap has been encoded with reference to a value of the first set which is closer in time to the at least one value of the second set than any other value in the second set, the device further comprising;

means for decoding the first set of values to obtain a first set of decoded values, and

means for decoding the second set of values to obtain a second set of decoded values, the at least one of the values of the second set related to the at least two subsequent times in the overlap being decoded with reference to the value of the first set which is closer in time to the at least one value of the second set than any other value in the second set.

18. A receiver comprising:

an input unit (30) for receiving a bit-stream representing an encoded signal ([S]),

a decoder (31) as claimed in claim 16 for decoding the encoded signal ([S]) to obtain a decoded signal (S), and

an output unit (32) to provide the decoded signal (S).