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US 9,178,479 B2Granted
Dynamic range control apparatus
AssigneeMitsubishi Electric Corporation
InventorsMasaru Kimura, Hirohisa Tasaki
Life of this patent
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Abstract
Filters 106-1-106-N divide an input signal 100 into N band-limited signals 107-1-107-N, and multipliers 108-1-108-N carry out dynamic range control of the N band-limited signals 107-1-107-N, respectively. After that, filters 111-1-111-N eliminate odd harmonics caused by the dynamic range control, and a signal synthesis unit 113 combines the signals passing through the filters 111-1-111-N into a single output signal 114.
Claims6
A dynamic range control apparatus comprising:
- a volume level calculating unit that calculates a volume level value approximately proportional to a volume level of an input sound signal;
- a gain calculating unit that calculates a gain factor corresponding to the volume level value calculated by the volume level calculating unit;
- a first filter group including N filters that split the sound signal into N (>1) frequency bands, and output N band-limited signals;
- N multipliers that multiply the N band-limited signals output from the first filter group by the gain factor calculated by the gain calculating unit to carry out gain control;
- a second filter group including N filters that extract prescribed frequency bands from the N band-limited signals output from the N multipliers, respectively;
- and
- a signal synthesis unit that combines the N band-limited signals output from the second filter group into a single signal.
4 more elements
A dynamic range control apparatus comprising:
- a first filter group including N filters that split an input sound signal into N (>1) frequency bands, and output N band-limited signals;
- N volume level calculating units that calculate N volume level values approximately proportional to volume levels of the N band-limited signals output from the first filter group;
- N gain calculating units that calculate N gain factors corresponding to the N volume level values calculated by the N volume level calculating units;
- N multipliers that multiply the N band-limited signals output from the first filter group by the N gain factors calculated by the N gain calculating units to carry out gain control;
- a second filter group including N filters that extract prescribed frequency bands from the N band-limited signals output from the N multipliers, respectively;
- and
- a signal synthesis unit that combines the N band-limited signals output from the second filter group into a single signal.
4 more elements
Dependencies are inferred from the claim text.