Process and device for mixing sound signals

• US 6,363,155 B1
• Filed: 12/22/1997
• Issued: 03/26/2002
• Est. Priority Date: 09/24/1997
• Status: Expired due to Term

• Current Assignee: Studer Professional Audio AG (Samsung Electronics Co. Ltd.)
• Original Assignee: Studer Professional Audio AG (Samsung Electronics Co. Ltd.)
• Inventors: Horbach, Ulrich
• Primary Examiner(s): Isen, Forester W.
• Assistant Examiner(s): Grier, Laura A.
• Application Number:
  US08/996,203
• Time in Patent Office: 1,555 Days
• Field of Search: 381/17, 381/18, 381/61, 381/63, 381/1, 381/19-23
• US Class Current: 381/17
• CPC Class Codes: G10L 19/008 Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
• CPC Class Codes: H04S 3/02 of the matrix type, i.e. in which input signals are combined algebraically, e.g. after having been phase shifted with respect to each other
• CPC Class Codes: H04S 7/302 Electronic adaptation of stereophonic sound system to listener position or orientation H04S7/301 takes precedence

Abstract

The present invention is directed to a process and device for mixing a plurality of sound signals. The process includes separating each sound signal and selectively delaying each separated sound signal. The process also includes selectively weighting each separated and selectively delayed sound signal and adding corresponding ones of the selectively weighted signals to an intermediary signal. The process also includes separating and filtering each intermediary signal, and adding the intermediary signals to form an output signal. The device for mixing sound signals of a plurality of input channels into a plurality of output channels includes each input channel having a plurality of partial channels, a decoder providing the plurality of outputs, and a plurality of intermediary channels coupled to the plurality of partial channels and to the decoder.

Claims

1. A process for mixing a plurality of sound signals comprising:

separating each sound signal;

selectively delaying each separated sound signal;

selectively weighting each separated and selectively delayed sound signals in accordance with a number of channels;

adding the selectively weighted signals corresponding to a same channel to form a plurality of intermediary signals; and

decoding each intermediary signal to produce a plurality of output signals, by;

separating each intermediary signal into a plurality of signals to be filtered, the plurality of signals corresponding in number to a number of the plurality of output signals;

filtering each separated intermediary signal; and

adding corresponding filtered signals together to form the plurality of output signals, said filtering comprising;

selecting a reference direction for normalization;

determining a filter pair for each angle of incidence;

approximating each filter pair by transfer functions of recursive filters of between approximately 1 and 6 degrees;

processing the signal in a non-recursive filter; and

processing the signal in a recursive filter.

2. The process in accordance with claim 1, further comprising modeling inter-aural transit time differences during the filtering.

3. The process in accordance with claim 2, further comprising modeling the intensity differences and transmit time differences independent of each other.

4. The process in accordance with claim 1, further comprising modeling inter-aural intensity differences during the filtering.

5. The process in accordance with claim 4, further comprising modeling the intensity differences and transmit time differences independent of each other.

6. The process in accordance with claim 1, wherein the selective weighting comprises multiplying the separated and selectively delayed sound signals for a particular channel by a weighting factor.

7. The process in accordance with claim 1, wherein the separation of the sound signals comprises separating each sound signal into a number of signals corresponding to a number of the plurality of sound signals to be mixed.