Low-pitched sound creator

Claim 2

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.

Claim 3

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.

Claim 4

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.

Claim 5

The sound creator of claim 2 further comprising means for adding the first sub low-pitched sound signal and the very-low-pitched sound signal to form a processed low-pitched sound signal.

Claim 6

The sound creator of claim 2 wherein the enabling/interrupting means includes a switching circuit selectively allowing and inhibiting transmission of the very-low-pitched sound signal to the converting means, and further comprising a third low-pass filter selecting low-frequency components from the mixed signal and thereby deriving a third low-pitched sound signal representing the selected low-frequency components of the mixed signal, and means for adding the third low-pitched sound signal to a signal outputted from the switching circuit to the converting means.

Claim 7

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.

Claim 8

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.

Claim 9

The sound creator of claim 5 wherein the detecting means comprises means for adding the two channel signals to form a second mixed signal, a band-pass filter selecting components in a preset frequency band from the second mixed signal and generating a band-pass signal representing the selected components, the preset frequency band corresponding to a fundamental frequency range of voice components, means for integrating the band-pass signal and thereby deriving an integral signal from the band-pass signal, and means for comparing the integral signal and a reference level.

Claim 10

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.

Claim 11

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.

Claim 12

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.

Claim 13

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.