The purpose of this research was to investigate the effects of domestic cleaning on upholstery covering materials backcoated with fire retardants. The results are an indicator of the effectiveness of legislative controls for upholstery. A questionnaire and pilot study were used to devise standard treatment procedures reflecting popular domestic cleaning methods. Samples of material were subjected to each treatment procedure followed by testing to the match test in BS 5852:Pt 1: 1979, over filling material specified in Part 1 of Schedule 5 of the Furniture and Furnishings (Fire) (Safety) Regulations 1988. To provide a standard, materials were also subjected to the water soak procedure in BS 5651: 1978, followed by testing to the match test. The results indicate that domestic cleaning methods affect backcoated fire retardants in such a way that current furniture legislation does not adequately provide for the level of durability required in practice. In addition, evidence was gained via a retail survey which suggests that consumers are not provided with sufficient aftercare information when purchasing new furniture.
This paper proposes a method for the formation of an auxiliary media channel within a host signal. Using a psychoacoustic frequency masking model, perceptually insignificant subband components of the host audio signal are identified and removed. The auxiliary channel data are placed in the empty subbands in the host signal and scaled to a level below the audible threshold. An implementation is given along with results suggesting that the proposed method can effectively hide an auxiliary media channel in a normal audio signal without degrading the perceived sound quality.
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