Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
155 words
An amplifying circuit comprising: a high frequency amplifying circuit (3) for amplifying a high fiequency component of a reproduction signal having frequency components in a range from a low frequency to a high frequency; a low frequency amplifying circuit (4) for amplifying a low frequency component of the reproduction signal; input filters (6, 8, 10, 11) which are provided on the input side of said respective amplifying circuits so as to pass the frequency components of the amplifying circuits; output filters (7, 9) which are provided on the output side of the amplifying circuits and have the same characteristics as those of the input filters; and an adding circuit (5) for adding outputs of the output filters (7, 9), wherein the amplified reproduction signal including the frequency components in a range from the low frequency to the high frequency which have been added by the adding circuit (5) is directly supplied to an electro-acoustic converter.
Claim 2
Dependent Claim
21 words
An amplifying circuit according to claim 1, wherein at least three circuits (3, 4, 16) of amplifying circuit systems are provided.
Claim 3
Dependent Claim
24 words
An amplifying circuit according to claim 2, wherein the low frequency side output filter (9) is constructed by connecting a capacitor and a resistor.
Claim 4
Dependent Claim
185 words
An amplifying circuit comprising: a high frequency amplifying circuit (3) for amplifying a high frequency component of a reproduction signal having frequency components in a range from a low frequency to a high frequency; a low frequency amplifying circuit (4) for amplifying a low frequency component of the reproduction signal; input filters (6, 8, 10, 11) which are provided on the input side of said amplifying circuits so as to pass the frequency components; high frequency side output filters (7, 9) which are provided on the output side of the high frequency amplifying circuit (3) and have the same characteristics as those of the high frequency input filters; a matching filter (12) which is provided in the low frequency amplifying circuit system (L) as a filter to match with the filters of the high frequency amplifying circuit system (H); and an adding circuit (5) for adding outputs of said amplifying circuit systems (H, L), wherein the amplified reproduction signal including the frequency components in a range from the low frequency to the high frequency which have been added by the adding circuit (5) is generated.
Claim 5
Dependent Claim
25 words
An amplifying circuit according to claim 4, wherein the matching filter (12) is provided on the input side of the low frequency amplifying circuit (4).
Claim 6
Dependent Claim
90 words
An amplifying circuit according to claim 4 or 5, wherein a gain of the low frequency amplifying circuit (4) is set so as to suppress the signal by only an amount of the output which is attenuated upon addition since the output of the high frequency amplifying circuit (3) becomes a load and a filter (13) for emphasizing the low frequency and a change-over switch (14) to switch the operation of said filter (13) are provided for the low frequency amplifying circuit system (L), thereby emphasizing the low frequency band.
Claim 7
Dependent Claim
42 words
An amplifying circuit according to claim 4, 5, or 6, wherein the input filters (10, 11) are constructed so as to be also commonly used by feedback circuits of the amplifying circuits (3, 4) and constants of said input filters are set.