Software Implementation of B-Format Encoding and Decoding
New software tools are presented, which enable a standard PC equipped with a multichannel sound board to be used both for the creation of B-format signals, and for their playback over a suitable array of loudspeakers. The encoding of B-format signals is obtained by convolution of each original soundtrack with a proper B-format impulse response, obtained from measurement in existing spaces or from computation by a room acoustics software. The decoding is made thanks to a small dedicated program, which can be set to emulate a standard Ambisonics decoder (with fixed-gain shelf filters), or a new, wider class of decoders based on the recent theory about Energetic Analysis of Sound Fields. The decoder includes convolution with inverse filters which compensate for the irregularities of the loudspeakers. The system was developed mainly as an analysis tool and as a support for subjective listening tests in the automotive field and in the room acoustics field.
Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $20 for non-members, $5 for AES members and is free for E-Library subscribers.