Automotive audio reproducing apparatus

• US 6,501,843 B2
• Filed: 09/12/2001
• Issued: 12/31/2002
• Est. Priority Date: 09/14/2000
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Itabashi, Tetsunori, Usui, Junichi
• Primary Examiner(s): Mei, Xu
• Application Number:
  US09/950,722
• Publication Number:
  US 20020034308A1
• Time in Patent Office: 475 Days
• Field of Search: 381/302, 381/300, 381/87, 381/332, 381/333, 381/334, 381/86, 381/386, 381/389, 381/395, 381/17, 381/18, 381/19
• US Class Current: 381/302
• CPC Class Codes: H04R 2499/13 Acoustic transducers and sound field adaptation in vehicles
• CPC Class Codes: H04R 5/02 Spatial or constructional arrangements of loudspeakers
• 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

Abstract

An automotive audio reproducing apparatus according to the present invention comprises: a sound image position correction circuit 52 for converting a left-channel input digital audio signal XL(Z) and a right-channel input digital audio signal XR(Z) into a digital audio signal YL(Z) and a digital audio signal YR(Z), respectively, for output expressed by:

YL(Z)·GLL(Z)+YR(Z)·GLR(Z)=XL(Z)·FLL(Z)+XR(Z)·FLR(Z)

YR(Z)·GLL(Z)+YL(Z)·GLR(Z)=XR(Z)·FLL(Z)+XL(Z)·FLR(Z)

where FLL(Z) to GLR(Z) are given head related transfer functions; a depth correction circuit 53 for adding reflected sound signals to the signals YL(Z) and YR(Z), respectively; a D/A converter circuit 6 for subjecting output signals of the correction circuit 53 to D/A conversion; and a level control circuit 522 for controlling level of a difference signal in the sound image position correction circuit 52; whereby analog audio signals outputted from the D/A converter circuit 6 are supplied to a left-channel speaker and a right-channel speaker, respectively.

Claims

1. An automotive audio reproducing apparatus comprising:

a sound image position correction circuit for converting a left-channel input digital audio signal XL(Z) and a right-channel input digital audio signal XR(Z) into a digital audio signal YL(Z) and a digital audio signal YR(Z), respectively, for output expressed by;

2. An automotive audio reproducing apparatus as claimed in claim 1,

wherein delay time or level of said reflected sound signals supplied to said pair of adding circuits is controlled.

3. An automotive audio reproducing apparatus as claimed in claim 2, further including a correction circuit for correcting frequency characteristics of said output signals YL(Z) and YR(Z) that become said reflected sound signals.

4. An automotive audio reproducing apparatus as claimed in claim 2, wherein a frequency characteristic correction circuit is provided in a stage preceding said sound image position correction circuit.

5. An automotive audio reproducing apparatus as claimed in claim 1,

wherein at least said sound image position correction circuit, said reflected sound signal generating circuit, and said pair of adding circuits are formed by a DSP.