CD players on the go!

Article Abstract:

Fisher's $219.95 PCD-60, Sanyo's $180 CDP-55, and Aiwa's $220 X-559 are three portable compact disc players that feature special digital circuitry to correct for playback errors produced by shocks and bumps. All three units performed well in lab and listening tests.

Evaluation, Product/Service Evaluation, Portable stereos, Compact disc players, Compact disc players and recorders, Aiwa XP-559 (Compact disc system), Fisher PCD-60 (Compact disc system), Sanyo CDP-55 (Compact disc system)

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Upside down sound: find out whether you can hear polarity inversion

Article Abstract:

Recorded sound that has its polarity inverted reverses the asymmetry of the waveform and its envelope. Step-by-step instructions for building polarity switches for earphones and loudspeakers and for detecting polarity reversal are presented.

Analysis, Equipment and supplies, Loudspeakers, Sound-waves, Sound waves, Sound recording and reproduction, Headphones

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DVD hits the hurdles

Article Abstract:

Packing and pricing are some of the obstacles that the digital video disc (DVD) will have to surmount before being released into the mass market. Some observers believe that copyright laws may further delay the release of DVDs till 1997.

Planning, Product development, Copy protection, Digital video, Copy prevention techniques

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