Sound image and sound field controlling device

• US 5,999,630 A
• Filed: 11/09/1995
• Issued: 12/07/1999
• Est. Priority Date: 11/15/1994
• Status: Expired due to Term

• Current Assignee: Yamaha Corporation
• Original Assignee: Yamaha Corporation
• Inventors: Iwamatsu, Masayuki
• Primary Examiner(s): Kuntz, Curtis A.
• Assistant Examiner(s): Mei, Xu
• Application Number:
  US08/554,938
• Time in Patent Office: 1,489 Days
• Field of Search: 381/1, 381/17, 381/18, 381/19, 381/61, 381/63, 381/62, 381/86, 84/629, 84/630, 84/707, 84/DIG. 26
• US Class Current: 381/17
• CPC Class Codes: H04S 1/002 Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution control circuits for electronic adaptation of the sound field H04S7/30
• CPC Class Codes: H04S 1/007 in which the audio signals are in digital form data reduction aspects thereof based on psychoacoustics G10L19/02
• CPC Class Codes: Y10S 84/26 Reverberation

Abstract

On the basis of localization control data, a sound image localization controlling circuit reproduces input audio signals via a plurality of speakers after having applied predetermined delay-involving signal processing to the audio signals, to thereby perform sound image localization processing to localize sound images of direct sounds in a desired range including an area outside a space surrounded by the speakers. The audio signals are also supplied to a sound field controlling circuit after having been delayed by a predetermined time. The sound field controlling circuit performs operations to convolute the audio signals with reflected sound parameters so as to generate reflected sounds. The output signals of the sound image localization controlling circuit and sound field controlling circuit are fed to adders each adding together the signals of same channel. The resultant added signals are then sent to the speakers in a listening room for audible reproduction.

Claims

1. A sound image and sound field controlling device comprising:

sound image localization controlling means for generating a direct sound image by reproducing an input audio signal via a plurality of speakers, wherein said sound image localization controlling means applies predetermined delay signal processing to the input audio signal to thereby perform sound image localization processing to localize a sound image of a direct sound in a desired range including an area outside a space surrounded by the speakers; and

sound field controlling means for generating reflected sounds by reproducing the input audio signal via the speakers, wherein said sound field controlling means performs a convolution operation on the audio signal using impulse response characteristics of desired reflected sounds, based on reflected sound data determined in correspondence with hypothetical sound source positions of possible reflected sounds in an acoustic space, to thereby perform sound field impartment processing to impart a sound field effect, wherein said speakers are disposed with respect to a predetermined sound-listening point so as to generate a multiplicity of the reflected sounds in the acoustic space or a model space similar thereto,

wherein said sound image localization processing is initiated on the input audio signal prior to said sound field impartment processing.

2. A sound image and sound field controlling device as defined in claim 1, wherein said sound field impartment processing by said sound field controlling means is initiated after completion of said sound image localization processing by said sound image localization controlling means.

3. A sound image and sound field controlling device as defined in claim 2, wherein a time difference of at least 5 ms is provided between initiation of said sound image localization processing by said sound image localization controlling means and initiation of said sound field impartment processing by said sound field controlling means.

4. A sound image and sound field controlling device for generating direct and reflected sounds comprising:

sound image localization controlling means for generating a direct sound image by reproducing an input audio signal via a plurality of speakers, wherein said sound image localization controlling means applies predetermined delay signal processing to the input audio signal to thereby perform sound image localization processing to localize a sound image of a direct sound in a desired range including an area outside a space surrounded by the speakers; and

sound field controlling means for generating reflected sounds by reproducing the input audio signal via the speakers, wherein said sound field controlling means performs a convolution operation on the audio signal using impulse response characteristics of desired reflected sounds, based on reflected sound data determined in correspondence with hypothetical sound source positions of possible reflected sounds in an acoustic space, to thereby perform sound field processing to impart a sound field effect, wherein said speakers are disposed with respect to a predetermined sound-listening point so as to generate a multiplicity of the reflected sounds in the acoustic space or a model space similar thereto,

wherein said sound image localization processing of the input audio signal generates a direct sound image before said sound field impartment processing generates a corresponding first reflected sound.