Method and apparatus for screen related adaptation of a higher-order ambisonics audio signal

An apparatus for generating loudspeaker signals associated with a target screen size, the apparatus comprising:

• a receiver for obtaining a bit stream containing encoded higher order ambisonics signals, the encoded higher order ambisonics signals describing a sound field associated with a production screen size;
• an audio decoder for decoding the encoded higher order ambisonics signals to obtain a first set of decoded higher order ambisonics signals representing dominant components of the sound field and a second set of decoded higher order ambisonics signals representing ambient components of the sound field;
• a combiner for integrating the first set of decoded higher order ambisonics signals and the second set of decoded higher order ambisonics signals to produce a combined set of decoded higher order ambisonics signals;
• and
• a generator for producing the loudspeaker signals by rendering the combined set of decoded higher order ambisonics signals, wherein the rendering adapts in response to the production screen size and the target screen size, and wherein the rendering includes determining a first mode matrix that is based on a set of regularly spaced sampling point positions.