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US 4,790,014 AGranted
Low-pitched sound creator
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsKoji Watanabe, Katsuhiko Hayashi, Nobuaki Minakuchi, Masayuki Misaki, Kenichi Terai, Yasutoshi Nakama, Masaharu Morita
Life of this patent
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Abstract
An analog sound signal is outputted. Low-frequency components are selected from the outputted analog sound signal so that a low-pitched sound signal is derived from the analog sound signal. A key of the low-pitched sound signal is lowered so that a very-low-pitched sound signal is derived from the low-pitched sound signal. The analog sound signal and the very-low-pitched sound signal may be converted into corresponding sounds respectively.
Claims8
A low-pitched sound creator comprising:
- (a) means for deriving two channel analog sound signals;
- (b) a low-pass filter selecting low-frequency components from at least one of the analog sound signals and deriving a low-pitched sound signal representing the selected low-frequency components;
- (c) means for lowering a key of the low-pitched sound signal and thereby deriving a very low-pitched sound signal from the low-pitched sound signal;
- (d) means for adding the two channel signals to form a mixed signal;
- (e) a second low-pass filter selecting low-frequency components from the mixed signal and thereby deriving a second low-pitched sound signal representing the selected low-frequency components;
- and
- (f) means for adding the second low-pitched sound signal and the very low-pitched sound signal to form a processed low-pitched sound signal.
4 more elements
A low-pitched sound creator comprising:
- (a) means for deriving two channel analog sound signals;
- (b) a low-pass filter selecting low-frequency components from at least one of the analog sound signals and deriving a low-pitched sound signal representing the selected low-frequency components;
- (c) means for lowering a key of the low-pitched sound signal and thereby deriving a very low-pitched sound signal from the low-pitched sound signal;
- (d) means for deriving a subtraction between the two channel signals and generating a subtraction signal indicative thereof;
- (e) means for adding the two channel signals to form a mixed signal;
- (f) first and second sub low-pass filters included in the low-pass filter, the first sub low-pass filter selecting low-frequency components from the subtraction signal and thereby deriving a first sub low-pitched sound signal representing the selected low-frequency components of the subtraction signal, the second sub low-pass filter selecting low-frequency components from the mixed signal and thereby deriving a second sub low-pitched sound signal representing the selected low-frequency components of the mixed signal, the key-lowering means being operative to lower a key of the first sub low-pitched sound signal to form the very low-pitched sound signal;
- (g) means for converting the very low-pitched sound signal into a corresponding sound;
- (h) means for detecting an envelope of the second sub low-pitched sound signal;
- and
- (i) means for selectively enabling and interrupting the conversion of the very low-pitched sound signal into the corresponding sound in accordance with whether or not a level of the envelope exceeds a reference level.
7 more elements
A low-pitched sound creator comprising:
- (a) means for deriving two channel analog sound signals;
- (b) a low-pass filter selecting low-frequency components from at least one of the analog sound signals and deriving a low-pitched sound signal representing the selected low-frequency components;
- (c) means for lowering a key of the low-pitched sound signal and thereby deriving a very low-pitched sound signal from the low-pitched sound signal;
- (d) means for deriving a subtraction between the two channel signals and generating a subtraction signal indicative thereof;
- (e) means for adding the two channel signals to form a mixed signal;
- (f) means for detecting whether or not the two channel signals contain voice components;
- and
- (g) means for selectively passing either fo the subtraction signal or the mixed signal to the low-pass filter in accordance with whether or not the two channel signals contain voice components.
5 more elements
A low-pitched sound creator comprising:
- (a) means for outputting two channel sound signals;
- (b) means for deriving a subtraction between the two channel signals and thereby generating a subtraction signal indicative thereof;
- (c) means for adding the two channel signals to form a mixed signal;
- (d) a first low-pass filter selecting low-frequency components from the subtraction signal and thereby generating a first low-pitched sound signal representing the selected low-frequency components of the subtraction signal;
- (e) a second low-pass filter selecting low-frequency components from the mixed signal and thereby generating a second low-pitched sound signal representing the selected low-frequency components of the mixed signal;
- (f) means for lowering a key of the first low-pitched sound signal and thereby deriving a very-low-pitched sound signal from the first low-pitched sound signal;
- (g) means for detecting an envelope of the second low-pitched sound signal;
- and
- (h) means for selectively passing and cutting off the very-low-pitched sound signal in accordance with the detected envelope.
6 more elements
A low-pitched sound creator comprising:
- (a) means for outputting two channel sound signals;
- (b) means for deriving a subtraction between the two channel signals and thereby generating a subtraction signal indicative thereof;
- (c) means for adding the two channel signals to form a mixed signal;
- (d) means for detecting whether or not the two channel signals contain voice components;
- (e) means for selecting an arbitrary one of the subtraction signal and the mixed signal in accordance with whether or not the two channel signals contain voice components and thereby generating a selected signal representing the selected one of the subtraction signal and the mixed signal;
- (f) a low-pass filter selecting low-frequency components from the selected signal and thereby generating a low-pitched sound signal representing the selected low-frequency components;
- and
- (g) means for halving a key of the low-pitched sound signal and thereby deriving a very-low-pitched sound signal from the low-pitched sound signal.
5 more elements
Dependencies are inferred from the claim text.