Multichannel signal processing method, and multichannel signal processing apparatus for performing the method
Provided are an encoding method of a multichannel signal, an encoding apparatus to perform the encoding method, a multichannel signal processing method, and a decoding apparatus to perform the decoding method. The decoding method may include identifying an N/2-channel downmix signal derived from an N-channel input signal; and generating an N-channel output signal from the identified N/2-channel downmix signal using a plurality of one-to-two (OTT) boxes. If a low frequency effect (LFE) channel is absent in the output signal, the number of OTT boxes may be equal to N/2 where N/2 denotes the number of channels of the downmix signal.
1. A multichannel signal processing method, comprising:
identifying an N/2-channel downmix signal derived from an N-channel input signal; and
generating an N-channel output signal, from the identified N/2-channel downmix signal and a decorrelated signal generated from N/2 decorrelators, using a plurality of one-to-two (OTT) boxes,
wherein in response to a low frequency effect (LFE) channel being absent in the N-channel output signal, N/2 decorrelators are used, and
wherein N denotes a number of channels of the output signal and is an even number greater than 1.
2. The multichannel signal processing method of claim 1 ,
wherein each of the plurality of OTT boxes generates a 2-channel output signal using a 1-channel down mix signal.
3. The multichannel signal processing method of claim 2 , wherein an OTT box from which an LFE channel is output, each of the plurality of OTT boxes generates the 2-channel output signal using the 1-channel downmix signal and a CLD.
4. The multichannel signal processing method of claim 1 , wherein
in response to N exceeding M, the decorrelators are reused, and
M denotes a predetermined number of channels.
5. The multichannel signal processing method of claim 1 , wherein an OTT box from which an LFE channel is not output generates a 2-channel output signal using a residual signal, a 1-channel downmix signal, a CLD and an ICC.
6. The multichannel signal processing method of claim 1 , wherein the generating of the N-channel output signal includes generating the N-channel output signal using a pre-decorrelator matrix M1 and a mix matrix M2.
7. The multichannel signal processing method of claim 1 , wherein each of the plurality of OTT boxes generates the N-channel output signal using a channel level difference (CLD).
8. A multichannel signal processing method, comprising:
decoding an N/2-channel downmix signal encoded based on a first coding scheme; and
generating an N-channel output signal, from the N/2-channel downmix signal and a decorrelated signal generated from N/2 decorrelators, based on a second coding scheme,
wherein in response to a low frequency effect (LFE) channel is-being absent in the N-channel output signal, N/2 decorrelators are used, and
wherein N denotes a number of channels of the output signal and is an even number greater than 1.
9. A multichannel signal processing apparatus, comprising:
a processor configured to
identify an N/2-channel downmix signal derived from an N-channel input signal; and
generate an N-channel output signal, from the identified N/2-channel downmix signal and a decorrelated signal generated from N/2 decorrelators, using a plurality of one-to-two (OTT) boxes,
wherein in response to a low frequency effect (LFE) channel being absent in the N-channel output signal; N/2 decorrelators are used, and
wherein N denotes a number of channels of the output signal and is an even number greater than 1.
10. The multichannel signal processing apparatus of claim 9 , wherein each of the plurality of OTT boxes generates a 2-channel output signal using a 1-channel downmix signal.
11. The multichannel signal processing apparatus of claim 10 , wherein
in response to N exceeding M, the decorrelators are reused, and
M denotes a predetermined number of channels.
12. The multichannel signal processing apparatus of claim 10 , wherein an OTT box from which an LFE channel is not output generates a 2-channel output signal using a residual signal, a 1-channel downmix signal, a CLD and an ICC.
13. The multichannel signal processing apparatus of claim 10 , wherein an OTT box from which an LFE channel is output, each of the plurality of OTT boxes generates a 2-channel output signal using the 1 channel downmix signal and a CLD.
14. The multichannel signal processing apparatus of claim 9 , wherein the processor is further configured to generate the N-channel output signal using a pre-decorrelator matrix M1 and a mix matrix M2.
15. The multichannel signal processing apparatus of claim 9 , wherein each of the plurality of OTT boxes generates the N-channel output signal using a channel level difference (CLD).