Multi-mode method and an apparatus for processing a signal
Disclosed is a method of processing a signal, which includes receiving at least one of a first signal and a second signal, receiving mode information, and decoding the at least one of the first signal and the second signal using at least one of a first coding scheme and a second coding scheme according to the mode information. The mode information is information for indicating that a prescribed mode corresponds to one of at least three modes. The method includes detecting when a restricted mode change occurs and changing at least one mode when detecting a restricted mode change.
1. A method of processing a signal, comprising:
receiving, by a decoding apparatus, at least one of a first signal and a second signal;
receiving, by the decoding apparatus, mode information, the mode information for indicating that a prescribed mode corresponds to which one of at least three modes including a first mode, a second mode and a third mode;
when the mode information indicates that the prescribed mode is the first mode, decoding, by the decoding apparatus, the first signal using a first coding scheme;
when the mode information indicates that the prescribed mode is the second mode, decoding, by the decoding apparatus, the first signal and the second signal, comprising:
decoding the first signal using the first coding scheme;
decoding the second signal using a second coding scheme; and,
generating an output signal using the decoded first signal and the decoded second signal;
when the mode information indicates that the prescribed mode is the third mode, decoding, by the decoding apparatus, the second signal using the second coding scheme,
wherein the mode information includes a first frame mode as the mode information on a first frame and a second frame mode as the mode information on a second frame; and
detecting if a restricted mode change occurs, which includes when the first frame mode is the first mode and the second frame mode is the third mode or when the first frame mode is the third mode and the second frame mode is the first mode, and changing at least one of the first frame mode and the second frame mode into the second mode when detecting a restricted mode change,
wherein the first coding scheme corresponds to a speech coding scheme, and wherein the second coding scheme corresponds to an audio coding scheme, and
wherein the mode information is represented by using at least two pieces of flag information.
2. The method of claim 1 , wherein the mode information further includes bit rate information allocated to each of the first coding scheme and the second coding scheme, and wherein the mode information is determined through a plurality of Fourier transforms.
3. The method of claim 1 , wherein the first signal corresponds to a harmonic signal, wherein the second signal corresponds to a residual signal, and wherein the second signal is obtained from a signal resulting from subtracting the first signal from an input signal.
4. A physical apparatus for processing a signal, comprising:
a receiving unit receiving at least one of a first signal and a second signal, the receiving unit receiving mode information, the mode information for indicating that a prescribed mode corresponds to which one of at least three modes including a first mode, a second mode and a third mode, wherein the mode information includes a first frame mode as the mode information on a first frame and a second frame mode as the mode information on a second frame;
a decoding unit decoding the at least one of the first signal and the second signal using at least one of a first coding scheme and a second coding scheme according to the mode information, the decoding unit comprising:
a first decoder, when the mode information indicates that the prescribed mode is the first mode or the second mode, configured to decode the first signal using a first coding scheme; and,
a second decoder, when the mode information indicates that the prescribed mode is the second mode or the third mode, configured to decode the second signal using the second coding scheme;
a mode changing unit detecting if a restricted mode change occurs, which includes when the first frame mode is the first mode and the second frame mode is the third mode or when the first frame mode is the third mode and the second frame mode is the first mode, and changing at least one of the first frame mode and the second frame mode into the second mode when detecting a restricted mode change; and
a synthesis unit, when the when the mode information indicates that the prescribed mode is the second mode, generating an output signal using the decoded first signal and the decoded second signal,
when the mode information indicates that the prescribed mode is the third mode, decoding, by the decoding unit, the second signal using the second coding scheme,
wherein the first coding scheme corresponds to a speech coding scheme, and wherein the second coding scheme corresponds to an audio coding scheme, and
wherein the mode information is represented by using at least two pieces of flag information.
5. The physical apparatus of claim 4 , wherein the mode information further includes bit rate information allocated to each of the first coding scheme and the second coding scheme, and wherein the mode information is determined through a plurality of Fourier transforms.
6. The physical apparatus of claim 4 , wherein the first signal corresponds to a harmonic signal, wherein the second signal corresponds to a residual signal, and wherein the second signal is obtained from a signal resulting from subtracting the first signal from an input signal.
7. A method of processing a signal, comprising:
receiving, by a decoding apparatus, at least one of a first signal and a second signal;
receiving, by the decoding apparatus, mode information, the mode information for indicating that a prescribed mode corresponds to which one of at least three modes including a first mode, a second mode and a third mode;
when the mode information indicates that the prescribed mode is the first mode, decoding, by the decoding apparatus, the first signal using a first coding scheme;
when the mode information indicates that the prescribed mode is the second mode, decoding, by the decoding apparatus, the first signal and the second signal, comprising:
decoding the first signal using the first coding scheme;
decoding the second signal using a second coding scheme; and,
generating an output signal using the decoded first signal and the decoded second signal; and,
when the mode information indicates that the prescribed mode is the third mode, decoding, by the decoding apparatus, the second signal using the second coding scheme, wherein the mode information includes a first frame mode as the mode information on a first frame and a second frame mode as the mode information on a second frame; and
detecting if a restricted mode change occurs, which includes when the first frame mode is the first mode and the second frame mode is the third mode or when the first frame mode is the third mode and the second frame mode is the first mode, and changing at least one of the first frame mode and the second frame mode into the second mode when detecting a restricted mode change,
wherein the first coding scheme corresponds to a speech coding scheme, and wherein the second coding scheme corresponds to an audio coding scheme,
wherein the mode information is represented by using at least two pieces of flag information,
wherein the at least one of the first signal and the second signal includes a harmonic signal and a residual signal, the second mode uses the speech coding scheme to decode the harmonic signal, and uses the audio coding scheme to decode the residual signal, and
wherein a frame length of the first signal is same to that of the second signal, and the frame length is fixed.