Signal processing apparatus and method as well as program

Abstract

The present technology relates to a signal processing apparatus and method capable of reducing calculation loads, as well as a program.A signal processing apparatus includes an ambisonic gain calculation unit configured to find, on the basis of spread information of an object, an ambisonic gain while the object is present at a predetermined position. The present technology is applicable to an encoder and a decoder.

1 . A signal processing apparatus comprising:
 an ambisonic gain calculation unit configured to find, on a basis of spread information of an object, an ambisonic gain while the object is present at a predetermined position.   
     
     
         2 . The signal processing apparatus according to  claim 1 , further comprising:
 an ambisonic signal generation unit configured to generate an ambisonic signal of the object on a basis of an audio object signal of the object and the ambisonic gain.   
     
     
         3 . The signal processing apparatus according to  claim 1 ,
 wherein the ambisonic gain calculation unit   finds a reference position ambisonic gain, on the basis of the spread information, assuming that the object is present at a reference position, and   performs rotation processing on the reference position ambisonic gain to find the ambisonic gain on a basis of object position information indicating the predetermined position.   
     
     
         4 . The signal processing apparatus according to  claim 3 ,
 wherein the ambisonic gain calculation unit finds the reference position ambisonic gain on a basis of the spread information and a gain table.   
     
     
         5 . The signal processing apparatus according to  claim 4 ,
 wherein, in the gain table, a spread angle is associated with the reference position ambisonic gain.   
     
     
         6 . The signal processing apparatus according to  claim 5 ,
 wherein the ambisonic gain calculation unit performs interpolation processing on a basis of each reference position ambisonic gain associated with each of a plurality of the spread angles in the gain table to find the reference position ambisonic gain corresponding to a spread angle indicated by the spread information.   
     
     
         7 . The signal processing apparatus according to  claim 3 ,
 wherein the reference position ambisonic gain is a sum of respective values obtained by substituting respective angles indicating a plurality of respective spatial positions defined for spread angles indicated by the spread information into a spherical harmonic function.   
     
     
         8 . A signal processing method comprising:
 finding, on a basis of spread information of an object, an ambisonic gain while the object is present at a predetermined position.   
     
     
         9 . A program for causing a computer to perform processing comprising:
 finding, on a basis of spread information of an object, an ambisonic gain while the object is present at a predetermined position.