Audio and Video
You can use audio and video on your web site to increase sales.
Audio:
Almost nobody is using tapes anymore. People still use minidisks. But the tendency
is more and more to use mp3 players/recorders. Today's models range from $200
to $700 and can record directly into mp3 format. When recording speach into
an MP3 file, use the following settings:
- CBR (Constant Bit Rate) 16KBit/sec,
- sampling rate 11.025 KHz,
- sampling precision - 16 bit
- mono
These settings compress one hour of recording into a 7 MB file. The quality
is good enough. These setings are proven to work good when ripping audio CDs,
and also are compatible with some online flash utilities which you may decide
to use.
When searching for a recorder (whether minidisk or mp3) make sure that it has
input(s) for external signal.
I really like Iriver IFP-390T (from www.iriver.com). It has a line-level input,
so you can record from external sources, such as other players, cassette or
CD players, etc. But if you want to record from an external microphone or a
telephone pick-up - you many need a small preamplifier (with variable gain 10..100).
Pre-amplifiers:
- http://www.minute-man.com/acatalog/Audio_Pre_Amplifier_and_Amplifier_Kits.html
- http://www.hut.fi/Misc/Electronics/circuits/micamp.html
- http://sound.westhost.com/project66.htm
- LM386
Here are several simple software flash players which will play external mp3
files on the web page:
- free simple swf player (Bella Rakhman)
- http://www.web-site-audio.com/
- $39 one time purchase for a MS Windows application that creates a flash
audio player for you (and loads wav sound file into it).
- www.AudioGenerator.com -~$29/month
(Armand Morin). You talk into the phone - recording is saved on the server
- and you get html of a small player (play/pause/stop buttons) to play your
recording right on the page. The recording can be made long if necessary (it
is flash streaming). Very convenient service.
Video:
There are several ways to include video:
- mpg files (MPEG2) - you can make those clips from your video using software
like Adobe Premier. ~1MB per 10 seconds of the clip.
- Set Width/Height frame size to 300/200 pixels. This is because I start
with NTSC DV 720/480 = 3/2. Most players will understand it and play the
movie at the actual geometrical size ratio is 4/3. Note: if you try to
change the size to 320/240 (=4/3) - then the movie will look vertically
compressed in video players.
- Aspect ratio - just leave it at NTSC setting 1.095. Don't change it
to 1.
- Bitrate (Mbps) - set to ~0.8 Mbps by sliding the sliding control. The
actual number will be something like 0.8030. Note: do NOT enter this number
by hand. Use slider. Note: This bitrate will define file size of the file
as ~100 KB per 1 second of the clip. If you make bitrate too small - the
movie gets "jerky".
- Set Quality to 4 (or even smaller) using the slide control. Note: The
quality setting doesn't effect the final size of the file (it is defined
by the bitrate). If the quality is set unnecesary high - then it will
take longer to make an MPG file.
- Flash video - excellent for screen recording (demo how to use computer utilities).
You connect microphone to the computer - and use software "Camtasia Studio"
from www.techsmith.com/products/studio/
to record your voice and the computer screen as you doing something on the
computer. You can save the movie into a flash file (swf file).
I listen to lots of education audio-s.
Here is what I use:
- an iriver IFP-390T - 256 MB Flash
mp3 player/recorder from www.iriveramerica.com.
I use it for most of my audio recording and all of my listenning. Buy couple
extra USB cables with it.
- a set of good isolating headphones - Etymotic
ER-4P (~$270 at www.headphone.com).You
can probably live comfortably with a new low-cost version - Etymotic
ER-6 ($130). Note that
these headphones are expensive. But they allow clean hearing in a noisy
environment (on the street, in a subway, etc.). This gives you hundreds of
hours of productive learning every year (which would be lost otherwise). So
it is money well spent.
- a RadioShack recording control (~$20)
- a small simple custom-made battery-operated preamplifier with variable gain.
I use it to feed a small signal from the microphone or telephone into a line-level
input of the mp3 player. You can also buy a similar amplifier for $169 (search
for microphone preamplifier battery on www.froogle.com
- the one you need is from Sound Professionals).
- a regular cassette player with autoreverse (Panasonic, ~$20, 2xAA batteries)
- to play cassettes - and convert them into mp3 by connecting the cassette
player to the mp3 recorder.
- Marantz PMD-201 tape recorder - I still use it sometimes. Very good.
- External USB anolog-to-digital converter (Griffin iMic - griffintechnology.com).
I use it when I need to feed analog signal into the computer. It helps to
reduce the noise coming from computer.
- CD ripper - "Easy CD-DA Extractor" ( www.poikosoft.com
) - excellent tool.
- Cool Edit 2000 software. It used to be $69 from www.syntrillium.com
. Now Adobe bought them - and it is called Adobe Audition - and cost ~ $300.
Still, it is excellent software. I use it to capture the audio (including
streaming web audio), digitally filter it to remove noises, edit it (change
amplitude, delete junk pieces) - and save into mp3 format.
- mp3SplitterJoiner software ($20 from www.ezsoftmagic.com
) - to join many small mp3 files into one.
- mp3tag software (freeware from www.mp3tag.de
) - to edit tags in mp3 files.
- Streambox Ripper v.2.009 - to batch-convert files from RM (RealAudio) to
MP3. Note: only this old version does it.
- a $20 software recorder from www.polderbits.com
has a timer feature - so you can set the recording time and go to sleep. Excellent
for recording programs when you are sleeping or out.
Here is what some other people use
Here are some other options:
- Radio Shack small adapters - basically a small microphone attached to a
handset. Very sensitive to external sources of electrical interference (turn
off all flourecent lights etc.). You need to try it with different phones.
Some people like it.
- Radio Shack small adapter inserted between handset and the phone base.
Similar device you can buy from Hello Direct.
- Ttelephone adapter TRX-20 from from Ahern Communications (www.ahernstore.com/recordingjacks.html).
- Sony DAT recorder ($400 off Ebay) - very good, up to 4 hours of recording.
- Sony MZ-N707 portable minidisk player/recorder (~$180) - has analog audio
input, records on a mini-disk up to 4 hours, good quality.
Here is an option I tested and rejected - Konexx:
Konexx's "Phone 2 PC". The hardware/software combination for ~$180.
The hardware consists of a splitter inserted between the handset and the
phone base. The signal then is fed into a small AC-powered box with AGC
circuit (Auto Gain Control) which adjusts the volume automatically so
that both parties voices have approximately the same volume. The output
is fed into the audio input of your recording device or your computer.
The software allows to monitor and adjust volume - and to record into
WAV files or highly compressed GSM files (one hour -> 7 MB).
I tested Konnexx device - and rejected it for several reasons.
First, the device is supposed to be connecting directly between your
computer and your telephone. When you do this - you get a lot of noise
in your recording (especially if you use a notebook computer). This is
because connecting all the devices together creates a big electrical loop
which works like an antenna. You need to de-couple the pieces to remove
the noise. Unfortunately Konexx's device doesn't do this decoupling.
Second, the auto-gain control feature by itself is nothing special -
it is a standard feature of all tapes recorders (including the Marantz
I use).
Third - the software by itself doesn't do anything special. The CoolEdit
Pro (Adobe Edition) is much more powerful.
Forth - the product is very overpriced ($180). They don't sell hardware
separately (because then it should be ~ $30 to compete with RadioShack).
In comparison, RadioShack ($25) + CoolEdit ($69) + any tape recorder (~$50).
Note: KONEXX also sells "Model 100" for $69. I bought it and looked inside
- it is a simple passive splitter similar to a $12 RadioShack splitter.
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Here are some more links:
Some techical links:
MAX4129, etc.
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