H - Electricity – 03 – G
Patent
H - Electricity
03
G
179/2, 179/5
H03G 9/18 (2006.01) H03F 1/26 (2006.01) H03G 9/02 (2006.01) H03G 9/16 (2006.01)
Patent
CA 2030784
Three related embodiments of audio signal dynamic range circuits for consumer and semi-professional audio signal compressors; expanders, and compressor/expander noise reduction systems incorporate certain basic features of professional Spectral Recording (SR) while adapting SR for use with consumer recording media (particularly audio cassette tape) and reducing the cost and complexity of the SR circuitry. In addition, the three embodiments, and particularly the preferred embodiment, provide substantial compatibility with the existing B-type and C-type consumer and semi-professional noise reduction systems. Subjective performance substantially equivalent to 16-bit PCM audio systems is achieved with analog audio cassette tape media. In all three embodiments there are two cascaded stages: (1) a high-level stage a high-frequency fixed-band/sliding band action-substitution substage (324A) and a low-frequency fixed-band sub-stage (328A) and (2) a low-level stage having only a high-frequency fixed-band/ sliding band action-substitution sub-stage (326A). The dynamic action regions of the high-frequency action-substitution sub-stages are staggered. Each of the high-frequency sub-stages provides up to 12 dB of dynamic action (together providing up to 24 dB of dynamic action) and operates in a frequency band defined by a single-pole filter having a high-pass shelving response with a corner frequency of 400 Hz. The low-frequency sub-stage provides up to 10 dB of dynamic action and operates in a frequency band defined buy a single-pole filter having a low-pass shelving response with a corner frequency of 200 Hz. The single-pole filter characterisctics provide a broad and smooth overlap of the high-frequency and low-frequency characteristics. Particular forms of spectral skewing and antisaturation enhance the performance of the circuits with consumer recording media.
Raccord entre conduits (12, 14) comportant chacun une garniture (16, 18) en polyoléfine telle que le polythène. Les conduits sont espacés, la garniture dépasse de chacun d'eux et est raccordée à sa voisine par un accouplement par fusion (20). Les conduits sont interconnectés par une enveloppe (24, 26, 28) et du lait de ciment époxy (34) remplit l'espace se trouvant entre la garniture et l'enveloppe. Ladite garniture est insérée dans le conduit après que celui-ci est réduit en diamètre par passage dans une matrice. La pression de gaz ou de liquide à l'intérieur de la garniture, lors de l'utilisation est supérieure à celle que ladite garniture peut supporter seule, mais le lait de ciment transfère la charge de pression à l'enveloppe. Certaines modifications prévoient le remplacement de l'accouplement par un accouplement PECAT ou par des accouplements à brides raccordés aux conduits par fusion de manchons ou par électrofusion directement ou à l'aide de coupleurs d'électrofusion. One peut fixer la garniture en position à l'aide de raccordements d'électrofusion afin d'empêcher un changement des dimensions par réversion.
Cossette Stanley Gene
Dolby Ray Milton
Dolby Ray Milton
Dolby Laboratories Licensing Corporation
Smart & Biggar
LandOfFree
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