Voice-controlled hi-fi

At a recent Toshiba press conference I noticed a stack of mini-hi-fi components [PS, Jan.] with a microphone attached. But the mike, I learned, wasn’t plugged in to record music. Instead, it lets you store 15 verbal commands in a microcomputer memory. After that, the hi-fi system responds only to your voice, enabling you to perform 19 functions—operating a cassette deck orally, controlling volume, or selecting tuner channels, for example.

Voice-actuated electronics, familiar to computer hobbyists, is expected to become commonplace in the 1980’s. Toshiba and other firms have also shown voice-actuated TV prototypes. Toshiba’s system may put a question mark on an LED display if it doesn’t understand you. Or a voice generated by the system may answer with “repeat” and then “okay” when your diction is recognizable. Toshiba has no definite marketing plans.

High-definition TV

While voice-operated TV’s may be avail- able in a few years, high-definition TV. under study by the Society of Motion Picture and Television Engineers, is further off. TV expert Donald Fink recently outlined the conclusions of an SMPTE panel studying how color-TV fidelity should be improved. Detailed recommendations are slated for the society journal. Highlights:
• Data on how viewers react to superior high-definition (HD) TV is very meager. Public exposure in theaters may be needed prior to home introductions.

• A standard of comparison, for HD TV standards, should be the superior quality of original 35-mm movie releases. A wide-screen aspect ratio, such as 2:1, is preferable to today’s 4:3 ratio.

• Some 1100-1500 scanning lines, compared to 525 in U.S. broadcasts, should be established. A signal bandwidth of about 25 MHz (enough for four TV channels today) is needed.

• Color and brightness (luminance) signals should not be combined as they are now for compatibility.

• A “junior” version of an HD TV system, with excellent pictures, can be achieved today on sets that use all of the station’s signal. Color sets now reject about half the available signal. New techniques such as comb filters [“Hi-fi Color-TV Pictures,” PS, Aug. 78], Fink noted, are starting to improve picture fidelity.

• Getting HD TV into homes is feasible with direct satellite-to-home signals [see story on satellite TV in this issue]. In Tokyo, a satellite-to-Earth 1100-line HD TV system has been demonstrated with a five-foot receiving dish. Fiber-optic cable-TV setups might also be used.

As long as experts are revamping color-TV standards, University of Illinois psychology professor Jozef Cohen and colleague Thomas Friden of the University of New Mexico believe the National Television Standards Committee (NTSC) technique of encoding color pictures should be changed. “Somewhere, somehow, the NTSC has confused brightness (or luminance) with achrominance (or whiteness). These are very different things,” Cohen writes. His and Friden’s papers on the subject are based on a computer study and historical review of color-perception theory. Cohen believes some of the subtle technical problems with color-TV pictures stem from erroneous signal encoding that starts at studio TV cameras.

Sonic holography

Bob Carver, demonstrating his new C4000 preamp for me, cleaned a disc and put it on a turntable. He began playing a musical in stereo. “Now listen for the off-stage voice,” he said, pushing a C4000 button labeled sonic hologram generator. As he did so, the space between the stereo speakers in the hotel suite seemed to expand dramatically. The 3D expansion of audio space almost seemed to wrap around the room—a far greater change in listening realism than suddenly switching from monophonic to stereo. It was easy, I found, to pinpoint the apparent source of “Fiddler on the Roof” offstage lines.

But while the 4000’s circuits do a remarkable job of adding realism to sound from stereo discs, there’s only a very narrow location in front of the speakers (one person wide) where the sonic “holography” effect is clearly audible. The $867 preamp, with enough push buttons for an F-111B electronic-countermeasures panel, has special noise-reduction circuits, and time-delay circuits that further alter the apparent size of your listening room. Record companies may market discs encoded by Carver’s sonic-holography technique that could be played back without the special preamp circuit.

Quick looks

• IBM has joined forces with MCA and Japan’s Pioneer to produce and market optical video-disc players. GM now has two-thirds of 10,000 players it ordered.

• Latest entry to the video tape and disc software field is Warner Communications’ WCI Home Video Inc. For 1980, it’s planning 55 releases.

• Home-computer firms must redesign their products to meet new FCC standards. Many machines radiate interference on lower TV channels and FM.

• BASF will call its new VCR a Linear Video Recorder (LVR). Planned for marketing soon, this deck moves tape at high speed over a stationary head.

• Two-way cable-TV operations are growing as Warner Cable Corp. and American Express expand the Columbus, Ohio, Qube system into Houston, Cincinnati, Pittsburgh, and elsewhere. Shop-at-home systems based on credit cards may be set up.

Curve plotter

Tired of regular TV fare? Apple II computer owners, used to creating their own computerized TV images, can now tackle simple or complex statistics problems with the Stat Pac. This new computer-disk program from Creative Discount Software (256 S. Robertson, Suite 2156, Beverly Hills, Calif. 90211) fits curves to data (above), stores data, and includes key statistics functions.

  1. Casandro says: April 29, 201110:53 am

    Actually LVR never quite made it to the market. The main problem was probably stopping the tape at the and and reversing it… Yes, that system was insane from the beginning.

  2. Toronto says: April 29, 201111:41 am

    Casandro: But linear tape (DLT, LVO, etc.) is the standard for data backups these days.

    LTO is about 1.5 TB per cartridge at present.

  3. Hirudinea says: April 29, 20114:27 pm

    30 years for hdtv, considering the government was invloved, that ain’t bad.

  4. Mcubstead says: April 29, 20116:16 pm

    Did you notice, not only did it take 30 years, but we only got 1080 lines, not the 1100-1500.

    Yep it is a very similar platform, but the cost was rather high. Beta was a better product than VHS as well, but the cost of the tapes and players killed it. Lessons were learned however and when Blue-Ray was competing they smart enough to get Disney to commit 100% to it, after all who would want a player than can’t play Disney movies?.

  5. Casandro says: April 30, 20113:49 am

    @Hirudinea: Actually the main advantge of LVR would have been the cost. Headwheels are delicate and expensive devices. Doing away with it promised huge cost savings.

    It’s a lot different with data. As you don’t need to read data continuously. Short gaps when the tape rewinds or the head repositions are perfectly OK. Video on the other hand needs to be continuous. Gaps longer than a hundred microseconds couldn’t be compensated.

  6. David Moisan says: April 30, 20115:03 pm


    The old Japanese MUSE standard upon which HDTV was based used 1150 analog lines, it’s true. But a good number of lines were not visible due to sync and retrace timing requirements. It worked out, somewhat, to 1080 *active* lines. Compare that with NTSC which is a 525 line system–but with only 480 *active* lines. We’re not really being ripped off.

    What was almost not anticipated, was the death of interlaced images. HDTV was virtually designed around the CRT and related technologies and did not anticipate computer images (progressive scan) nor non-CRT displays (plasma). If we were still using CRT’s, most of them would not support the full 1080p resolution. And you’d pay out the nose for widescreen (16:9 CRTs were *expensive* and would not have gotten a lot cheaper due to the added glass.)

  7. Casandro says: May 1, 201112:18 pm

    @David Actually the first HDTV productions in the US, namely some budget series called Xena were made in 720p. Back then HDTV cameras still worked with tubes and were able to be reprogrammed to do just about any system you could imagine.

  8. carlm says: May 2, 20113:28 am

    The original HDTV was an analog system. In the late 1980’s, the system’s resolution was 1125 vertical lines, interlaced. Pixels are a digital measurement. There is a difference in the measurement of horizontal lines in analog and vertical pixels in digital pictures. Many lines in analog TV include the vertical blanking interval and doesn’t contain active picture information. Lines 14 through 20 have been used for data and test pulses such as closed captioning, text and time code. NTSC analog video has 525 horizontal lines. Digital images that just contain the active picture is 480 vertical lines or pixels. Today’s digital signals are counted only for active video resolution, so the 1080 resolution is the same as the 1125 line analog vertical scan lines. Video blanking is not digitally encoded. The audio is usually multiplexed in the gaps of horizontal and vertical blanking intervals. David Moisan got it right except the MUSE system was also 1125 lines. If I remember, a Sony Trinitron 16:9 30 inch HDTV monitor ran about $30,000 in 1988. It used analog RGB and Sync inputs. A rather obscure and tedious movie called “Julia and Julia” with Kathleen Turner and Sting (1987) has the distinction of being the first theatrical movie to be shot on HDTV video tape.

  9. Casandro says: May 3, 201110:10 am

    @carlm Actually the European HDTV-System HD-Mac actually had 1250 lines, twice of what the “Gerber”-Norm had. It used “double interlacing” to be compatible to normal D2-Mac which was supposed to be the norm for direct to home satellite.

Submit comment

You must be logged in to post a comment.