Abstract: In a sheet conveying mechanism, a first bulging space and a second bulging space are provided on a downstream side and an upstream side, respectively, of a conveying path. The second bulging space has a length L1 along the conveying path. The conveying path between the first and second bunging spaces is defined to have a length L2. The lengths L1 and L2 are set to satisfy a predetermined relationship with a frequency of noise propagating through the conveying path. The sheet conveying mechanism can inexpensively reduce noise generated inside the conveying path during sheet conveyance without hindering the conveyance of the sheet.

Abstract: Characteristics of spatial transmission from a speaker to a microphone contained in a remote controller and set in a listening area and in a non-listening area are measured. A plurality of different types of sound field control effects is calculated on the basis of the spatial transmission characteristics to predict the plurality of types of sound field control effects. The plurality of types of sound field control effects is displayed and presented to a user. The speaker is driven by using a control sound source corresponding to one sound field control effect selected from the plurality of types of sound field control effects by the user operating the remote controller to perform effective sound field control in the listening area and in the non-listening area.

Abstract: In a sheet conveying mechanism, a first bulging space and a second bulging space are provided on a downstream side and an upstream side, respectively, of a conveying path. The second bulging space has a length L1 along the conveying path. The conveying path between the first and second bunging spaces is defined to have a length L2. The lengths L1 and L2 are set to satisfy a predetermined relationship with a frequency of noise propagating through the conveying path. The sheet conveying mechanism can inexpensively reduce noise generated inside the conveying path during sheet conveyance without hindering the conveyance of the sheet.

Abstract: A reproduction apparatus includes an acoustic signal generator which generates an acoustic signal, first sound pressure detection points located at N points in an audible area to detect sound pressure signals, N+1 control sound wave generators each of which emits a sound wave based on the acoustic signal to generate a control sound, second sound pressure detection points located at M points in a non-audible area to detect sound pressure signals, M sound wave generators each of which emits a sound wave based on the acoustic signal to generate a main sound, and a controller to control an amplitude and a phase of each of the (N+1) control sound wave generators.

Abstract: A sound reproducing apparatus includes an amplitude and phase adjusting unit that adjusts amplitude and phase of a sound signal which is supplied as an input, and outputs an adjusted sound signal; a first sound source that outputs a first sound based on the sound signal; and a second sound source that outputs a second sound based on the adjusted sound signal, and that has a different distance decay rate from the first sound source, the distance decay rate representing a ratio of attenuation of sound pressure of sound output from a sound source to a distance from the sound source; wherein the amplitude and phase adjusting unit adjusts the amplitude and the phase of the sound signal, so as to restrain a synthesis sound pressure that is a combination of a sound pressure of the first sound which is calculated based on the distance decay rate of the first sound source, and a sound pressure of the second sound which is calculated based on the distance decay rate of the second sound source, at a predetermined distan