Band Extension Reproducing Apparatus
First Claim
1. A band extension reproducing apparatus comprising:
- a high-frequency band component extraction unit which extracts, from an input signal, a high-frequency band component at a predetermined frequency or more;
a first shifter which acquires information on a harmonic overtone series interval from the input signal, and shifts frequency of the extracted high-frequency band component on the basis of the acquired information to generate first high-frequency band extension component; and
an adder which adds the generated first high-frequency band extension component to the input signal.
1 Assignment
0 Petitions
Accused Products
Abstract
Signals in two different bands (band components) are extracted from an input signal by an HPF and a BPF, and frequency-shift processing is performed by an MPY. Further, in order to adjust levels of an interface between the band components of shifted frequency to a high-frequency band side and the input signal, band components with which the input signal is adjacent to the high-frequency band extension components are extracted by an HPF. Then, a gain is controlled on the basis of the output values from the HPF and the HPF so as to reduce a difference between the components of shifted frequencies and the level of the input signal by the level correction coefficient calculating unit and the MPY. Then, the shifted components are added to the high-frequency band of the input signal by an ADDER.
-
Citations
8 Claims
-
1. A band extension reproducing apparatus comprising:
-
a high-frequency band component extraction unit which extracts, from an input signal, a high-frequency band component at a predetermined frequency or more; a first shifter which acquires information on a harmonic overtone series interval from the input signal, and shifts frequency of the extracted high-frequency band component on the basis of the acquired information to generate first high-frequency band extension component; and an adder which adds the generated first high-frequency band extension component to the input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
Specification