Jargon and lingo glossary - Ha to Hg.
Half Duplex See --> duplex
Hard Disk Recorder See --> HDR
HCC = Homogenised Crystal Copper
As far as we know Japanese companies are the only producers on the planet to be using this technology in very high quality copper wires and they do the processing in noble gas atmospheres to reduce oxidation, in most other countries this technique is only really used on alloys, although the raw wire made by these companies obviously shows up in cables and interconnects from third parties located all over the world. This manufacturing technique is primarily intended to increase durability of the cables in extreme weather conditions, any sound improvements are purely a by-product of the more coherent structure of the material, homogenisation also makes the cables have a lower tensile strength and hardness.
HDAM = Hyper Dynamic Amplifier Module
HDCD = High Definition Compatible Digital
The technique is not limited to CD standard bit rates but is most useful there since it allows for backwards compatibility, from the viewpoint of any device that can play a standard CD or comparable media a HDCD encoded CD is indistinguishable from a normal one, while units that have a HDCD compatible filter will take advantage of the extra information.
The HDCD technology does however not offer any improvements when the output signal has a resolution higher than 24 bits. Note that the introduction to the HDCD technology on the company's homepage is a bit misleading and also that the original name was High Definition Compact Disk and you may have seen it defined and used as such but Philips lawyers where not happy about the usage of their CD trademark it was soon changed to the current one.
The technology behind HDCD was developed by Pacific Microsonics but the company was taken over by Microsoft and the technology integrated into the Windows Media Player backend. Consumer and Hifi CD players featuring HDCD filters are still available but pro-audio products and mastering equipment is no longer sold or supported so media support has already dwindled considerably.
HDR = Hard Disk Recorder
1930's (UK) : used to denote the 405 line system that the BBC started broadcasting in 1936, earlier UK designed systems where mostly based on various interpretations of the Baird system and had resolutions as low as 30 lines although the 250 line variant was the most common.
1950's (UK) : Used to describe the 625 and 525 systems that where proposed to replace the 405 line standard, initially the UK was meant to use the 525 system but in the end and adapted the RCA 625 and the PAL system in 1964.
1980's (Japan) : Used to describe the HiVision system introduced in Japan in the latter half of the 80's.
1990's : A standard initially formulated in the USA and commonly referred to as just HD, intended as an answer to the Japanese HiVision format but ran into technical and political difficulties before finally being standardised in 1997 and then only after technical input of European companies and LG Electronics, was quick to gain a foothold in the USA since quality of even the lower HD resolutions offer considerable improvement over NTSC, however it failed to see any significant take-up in Europe until 2010 when the football world cup was shown in full HD in most of Europe, the reason was simply that the difference between the lower resolutions of HD and PAL is less than was anticipated so most broadcasters concentrated on introducing DVB and waited until full resolution HD televisions had become cheaper to introduce the system.
The term "head amp" comes from electric record cutters, but you had to buy an amplifier to suit the transducer which was called a cutter head and since the transducers of tape recorders were called heads as well the name stuck for all transducer amplifiers.