Method and means for the scalable improvement of the quality of a signal encoding method
View Patent ↗The invention relates to a method for the scalable improvement of the quality of an encoding method according to IT-U Recommendation G.722, including the following steps: —a digital error signal (E) derived from an input signal to be encoded and a prognosis signal is compared in sections to a number of M*LN different reference signals in an iterative process having a number of repeated steps depending on the scope of the expansion, and the reference signal having a minimum error signal of a prescribed error criteria is derived therefrom, —the reference signals are each made up of equidistant Dirac impulses δ(n) according to (I), wherein off=[0 . . . M−1], indicates the distance of the first impulse from a zero time point, αε{α, α, . . . , α} indicates the amplitude value, M the distance between the individual pulses, N the number of pulses, and L the number of different levels, —the information about the reference signal having the minimum error signal is transmitted. c ( n ) = ∑ p = 0 N - 1 α p · δ ( n - off - M · p ) ( I )
1. A method for scalable improvement of a quality of an encoding method according to International Telecommunication Union (“ITU”) Recommendation G.722, comprising:
comparing a digital error signal (“e H ”), derived from an input signal to be encoded and a prognosis signal, in sections to a number of M*L N different reference signals (“c(n)”) in an iterative process having a number of repeated steps depending on a scope of an expansion;
deriving from each comparison a reference signal having a minimum error signal with respect to a prescribed error criterion, wherein each of the reference signals is made up of equidistant Dirac impulses (“δ(n)”) according to the formula
c
(
n
)
=
∑
p
=
0
N
-
1
α
p
·
δ
(
n
-
off
-
M
·
p
)
and wherein off=[0, . . . M−1] indicates a distance of a first impulse from a beginning of a comparison segment, α p ε{α 0 , α 1 , . . . , α L-1 } indicates an amplitude value, M is a distance between two individual pulses, N is a number of pulses, L is a number of different levels α; and
transmitting information about the reference signal with the minimum error signal.
2. The method of claim 1 , comprising determining an expanded error signal (“e H1 (n)”) as an error criterion according to e H1 (n)=e H −c(n), and over a period of a comparison segment;
calculating an error amount according to
E
n
=
∑
n
=
0
Ma
e
H
1
(
n
)
2
;
and
determining a minimum error signal using the calculated error amount.
3. An arrangement for implementing the method of claim 1 , comprising a conventional encoder operating according to a Subband Adaptive Differential Pulse Code principle according to ITU Recommendation G.722 and means for generating reference signals which, for each step of the expansion, have a signal generator to generate the reference signals c(n), and a control unit that determines the error reference signal having a smallest error value.
4. A decoder configured to implement the method of claim 1 .
5. The method of claim 1 , wherein a control unit transmits the information about the reference signal with the minimum error signal.
6. The method of claim 1 , further comprising:
utilizing information about the reference signal with the minimum error signal to decode a payload signal.
7. The method of claim 1 , further comprising:
utilizing information about the reference signal with the minimum error signal to decode payload data.
8. The method of claim 1 , further comprising:
adapting at least one of a data rate and a size of transmitted data frames for transmissions of data that is to be transmitted.
9. The method of claim 8 , wherein the data to be transmitted is audio data.
10. The method of claim 1 , wherein L is 2, N is 5, and M is 8.