Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
211 words
In a four-channel surround sound generating circuit having a first-channel sound reproduction means and a second-channel sound reproduction means, each reproducing a respective channel-sound through a speaker, said circuit comprising: a third-channel amplifier and a fourth-channel amplifier, respectively, receiving the first-channel and second-channel sounds for amplifying said each received sound to a signal level adequate to a first surround speaker and a second surround speaker, respectively; surround mode selection means, receiving the first-channel sound and the second-channel sound from said each reproduction means, and in response to inputting of a first mode selection control signal, enabling or disabling to filter said received first-channel and second-channel sounds with a given bandwidth; surround-sound output control means, coupled between said surround mode selection means and said third-channel and fourth-channel amplifiers, for selectively enabling or disabling to make delay of the filtered first-channel and second-channel sounds supplied from the surround mode selection means, in response to inputting of a second mode selection control signal, upon delivering to said third-channel and fourth-channel amplifiers said filtered first-channel and second-channel sounds; and means for buffering control signals applied from a microcomputer, to provide said surround mode selection means with said first mode selection control signal and/or said surround-sound output control means with said second mode selection control signal.
Claim 2
Dependent Claim
211 words
In a four-channel surround sound generating circuit having a first-channel sound reproduction means and a second-channel sound reproduction means, each reproducing a respective channel-sound through a speaker, said circuit comprising: a third-channel amplifier and a fourth-channel amplifier, respectively, receiving the first-channel and second-channel sounds for amplifying said each received sound to a signal level adequate to a first surround speaker and a second surround speaker, respectively; surround mode selection means, receiving the first-channel sound and the second-channel sound from said each reproduction means, and in response to inputting of a first mode selection control signal, enabling or disabling to filter said received first-channel and second-channel sounds with a given bandwidth; surround-sound output control means, coupled between said surround mode selection means and said third-channel and fourth-channel amplifiers, for selectively enabling or disabling to make delay of the filtered first-channel and second-channel sounds supplied from the surround mode selection means, in response to inputting of a second mode selection control signal, upon delivering to said third-channel and fourth-channel amplifiers said filtered first-channel and second-channel sounds; and means for buffering control signals applied from a microcomputer, to provide said surround mode selection means with said first mode selection control signal and/or said surround-sound output control means with said second mode selection control signal.
Claim 3
Dependent Claim
64 words
The circuit as set forth in claim 1, wherein said surround mode selection means comprises first and second lowpass filters for filtering said received first-channel and second-channel sounds with a given bandwidth, and a first analog switch for enabling or disabling to provide said first and second lowpass filters with said first-channel and second-channel sounds, in response to said first mode selection control signal.
Claim 4
Dependent Claim
81 words
The circuit as set forth in claim 2, wherein said surround-sound output control means comprises first and second delaying circuits for respectively delaying by a given time period said first-channel and second-channel sounds supplied from said lowpass filters to said third-channel and fourth-channel amplifiers, and a second analog switch receiving the outputs of said lowpass filters, for selectively providing said third-channel and fourth-channel amplifiers, or, said first and second delaying circuits with said first-channel and second-channel sounds from said lowpass filters.