| US 7,577,259 B2 | ||
| Method and apparatus for extending band of audio signal using higher harmonic wave generator | ||
| Kazuya Iwata, Osaka (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Appl. No. 10/557,417 PCT Filed May 14, 2004, PCT No. PCT/JP2004/006854 § 371(c)(1), (2), (4) Date Jul. 10, 2006, PCT Pub. No. WO2004/104987, PCT Pub. Date Dec. 02, 2004. |
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| Claims priority of application No. 2003-141783 (JP), filed on May 20, 2003. | ||
| Prior Publication US 2007/0064956 A1, Mar. 22, 2007 | ||
| Int. Cl. H03G 3/00 (2006.01); H03G 5/00 (2006.01) | ||
| U.S. Cl. 381—61 [381/98] | 23 Claims |
| 1. A method for extending a band of an audio signal inputted into a band extending apparatus, said method including the steps
of:
responsive to the inputted audio signal having a predetermined band, generating, with a higher harmonic wave generating device,
a higher harmonic wave of the inputted audio signal;
generating a first modulated signal by modulating, with a modulator, an amplitude of a generated higher harmonic wave of the
audio signal according to a band signal having a predetermined bandwidth;
bandpass-filtering, with a band pass filter, a generated first modulated signal using a predetermined bandpass characteristic
and outputting a resultant first modulated signal; and
adding, with an adding device, a bandpass-filtered first modulated signal to the inputted audio signal, and outputting an
audio signal having an addition result.
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