Audio signal output device

• US 8,565,451 B2
• Filed: 08/06/2008
• Issued: 10/22/2013
• Est. Priority Date: 08/06/2007
• Status: Active Grant

• Current Assignee: Yamaha Corporation
• Original Assignee: Yamaha Corporation
• Inventors: Kano, Masaya, Kawai, Hironari, Suzuki, Hideyuki, Kumagai, Kunihiro, Takahashi, Tatsuya, Sugiura, Daigo
• Primary Examiner(s): Fulk, Steven J
• Assistant Examiner(s): WARD, ERIC A
• Application Number:
  US12/221,741
• Publication Number:
  US 20090060227A1
• Time in Patent Office: 1,903 Days
• Field of Search: 381/119, 381/123, 381 1- 28, 381104-109, 381/120, 381300-311, 381 56- 59, 381/73.1, 381 74- 85, 381332-336
• US Class Current: 381/123
• CPC Class Codes: H04R 2227/005 Audio distribution systems for home, i.e. multi-room use
• CPC Class Codes: H04R 27/00 Public address systems circuits for preventing acoustic reaction H04R3/02; circuits for distributing signals to loudspeakers H04R3/12; monitoring or testing arrangements for public address systems H04R29/007; amplifiers H03F
• CPC Class Codes: H04S 2400/03 Aspects of down-mixing multi-channel audio to configurations with lower numbers of playback channels, e.g. 7.1 -> 5.1 H04S2400/01 takes precedence
• CPC Class Codes: H04S 3/002 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

Under the control of a controller, a DSP supplies audio signals received from a switch circuit to a main zone DAC, subjects the audio signals received from the aforementioned switch circuit (i.e., audio signals for main zone use) to down-mixing processing so that the number of channels matches the number of output terminals assigned to each zone, and respectively supplies the audio signals subjected to down-mixing processing to the respective switch circuits of each zone. Each of the aforementioned switch circuits supplies the audio signals received from the subzone DAC to the respective volume adjustor of each zone.

Claims

1. An audio signal output apparatus comprising:

a signal processing unit which conducts a predetermined operation on input signals, and which outputs output signals of N channels;

a plurality of output terminals for a main zone outputting the output signals of N channels;

a mixing unit which generates output signals of M channels (M<

N) by down-mixing the output signals of N channels;

a selection unit which selects and outputs either output signals of M channels output from said mixing unit or other input signals;

output terminals for subzones outputting the output signals selected by said selection unit;

a memory unit storing setting data that indicates a correspondence relationship between said other input signals and the output terminals for subzones; and

a control unit which controls said selection unit to select output signals of said mixing unit in response to first and second command signals, wherein

in response to the first command signal, said control unit is operable to cause the down-mixed output signals of M channels to be output from the output terminals for the subzones while simultaneously the signals of N channels are output from the output terminals for the main zone,

in response to the second command signal, said control unit is operable to cause said other input signals to be output from the output terminals for the subzones based on the setting data, and

the setting data further includes data that defines, on a subzone-by-subzone basis, whether or not a source for the main zone is applied to the selection unit in response to the first command signal.

2. The audio signal output apparatus according to claim 1, wherein said selection unit is plural and integrally controlled by said control unit.

3. The audio signal output apparatus according to claim 2, further comprising a mode determination unit which determines whether or not a predetermined mode is selected with regard to each of said selection units, wherein

said control unit controls the selection unit to select the output signals of said mixing unit when said mode determination unit determines that said predetermined mode is selected with regard to the selection unit, and said control unit controls the selection unit to select an output signal other than the output signals of said mixing unit when said mode determination unit does not determine that said predetermined mode is selected with regard to the selection unit.

4. The audio signal output apparatus according to claim 1 further comprising a source selection unit which selects one signal among a plurality of signals output from a plurality of sources and determines the selected signal as the input signal of said signal processing unit.

5. The audio signal output apparatus according to claim 1 further comprising a source selection unit which selects one signal among a plurality of signals output from a plurality of sources and which determines the selected signal as the input signal of said mixing unit.

6. The audio signal output apparatus according to claim 1, wherein the predetermined operation conducted by said signal processing unit includes at least one of a sound field operation which appends sound field properties to the input signals and a decoding operation which decodes the input signals by applying a predetermined decoding method.

7. The audio signal output apparatus according to claim 1, further comprising a post-signal processing unit which conducts a sound field operation that appends sound field properties to the output signals of said mixing unit wherein

said selection unit selects and outputs either among the output signals of said post-signal processing unit or other input signals.

8. The audio signal output apparatus according to claim 1 wherein

said selection unit is plural, and the audio signal output apparatus further comprises:

a determination unit which determines whether or not the output signals to be output by each selection unit exist or not based on signals input from a manipulation unit; and

a subzone output on/off control unit which conducts an on/off control of an outputting operation to subzones corresponding to each of said selection unit based on determination results of said determination unit.

9. An audio signal output apparatus comprising:

a signal processing unit which conducts a predetermined operation on input signals, and which outputs output signals of N channels;

a main zone amp which amplifies the output signals of N channels output from said signal processing unit;

a mixing unit which down-mixes the output signals of N channels to M channels (M<

N);

a selection unit which selects and outputs either output signals of said mixing unit or other input signals;

a subzone amp which amplifies the output signals of said selection unit;

a memory unit storing setting data that indicates a correspondence relationship between said other input signals and the subzone amp; and

a control unit which controls said selection unit to select output signals of said mixing unit in response to first and second command signals, wherein

in response to the first command signal, said control unit is operable to cause the subzone amp to output the down-mixed output signals of M channels while simultaneously the main zone amp outputs the output signals of N channels,

in response to the second command signal, said control unit is operable to cause the subzone amp to output said other input signals based on the setting data, and

the setting data further includes data that defines, on a subzone-by-subzone basis, whether or not a source for the main zone is applied to the selection unit in response to the first command signal.