Abstract: An apparatus comprising means for: controlling rendering of first environmental audio captured from an environment of a first user to a second user in dependence upon second environmental audio that is being captured from an environment of the second user.

Abstract: Example embodiments relate to conference calls. In a method, there may be provided audio data and associated classification data from a plurality of user devices as part of a conference call, the plurality of user devices including at least a first user device and a second user device. The classification data may be indicative of one of a plurality of predetermined sound types represented by the associated audio data in a current time frame. The method may comprise determining that the audio data provided by the first user device is associated with a dominant speaker. The method may comprise controlling transmission of the audio data as part of the conference call, including preventing transmission of audio data provided by at least the second user device based on its associated classification data being indicative of a restricted sound type and the first user device being associated with a dominant speaker.

Abstract: A rotary disc filter is provided with a system for inhibiting biological fouling from biological growth on filters that form a part of the rotary disc filter. A biocide is pumped from a biocide supply tank to a manifold and mixed with a backwash to form a backwash-biocide solution. The backwash-biocide solution is sprayed onto filter media during a backwashing operation and the presence of the biocide inhibits and eliminates biological growth on the filter media.

Abstract: A force method of and assembly for trickling rock material from a silo. The bottom part of a silo is provided with a vaulting element and a pressure force is generated in a vaulting chamber or closed space below the vaulting element. For optimum trickling action, the forces facilitating trickling are concentrated on a vertical that extends through a trickling or draining outlet by mounting an upright friction plate for eliminating a frictional force and by directing a pressure force and a thermal force or power, which adds to the pressure force, on the same vertical through the trickling outlet along which the linear motion of a point of material occurs.

Abstract: A drain and duct system for buildings is provided in which a false ceiling element is fabricated ready furnished with branch drain pipes and a vertical duct element which is used as a vertical drain and may be used as ventilation ducts, wherein all branch drains in the false ceiling element connect and no separate drain pipe need be inserted. The connection of the branch drain elements with those of the vertical drain may be accomplished by inserting a pipe stump through the opening in the wall of the vertical duct element, this opening then being grouted with filling mix or connected by means of a flange joint.