Evidence And The History And
Evolution Of The Audio Recorder
By Ralph D. Thomas
One of my developed passions
in life for some reason has always been audio tape recorders. As a kid,
I collected them and played with them in my bedroom. I likely drove my
parents nuts recording everything. When I grew up, I was lucky enough
to become a private investigator and I used them in my work. In the last
30 years, I have marketed them through our company that specializes in
retail and wholesale distribution of investigative gear. I have literally
used and reviewed thousands of different types and models. In doing all
that, one would have a natural want to go back before one's own time and
research the history of the tape recorder as an investigative tool. The
step beyond that, of course; is to start collecting all the tape recorders
that have developed through the years. That is exactly what has been done
and a lot of these older recorders are quite interesting. As a tape recorder
addict, many of the newer models are wonders of the world to me. The old
recorders I fine truly fascinating. You might not be the tape recorder
addict that I am, but it's worth it to know a little about them. You can
find both the old and the new on display in the Spy And Private-Eye Museum
in Austin Texas which is now an extension of the Spy
Exchange And Security Center. In going through the presentation below,
on most of the recorders shown; you can click on the hotlink to get more
information about that recorder. When you are in the Austin, Texas area,
you might want to stop by the Spy
Exchange And Security Center and go through our Spy and Private-Eye
Museum so you can see this history in person. If you can not do that,
go online to PI
Vintage, The Spy And Private-Eye Museum.
Audio recorders and the ability to record one's voice have been around
in one form or another since the early 1900's. However, you might not
recognize the way in which voice was recorded from different decades starting
in about 1910.
Wax Cylinder Recorders, 1910
In an attempt to improve telephone transmitter technology, Thomas Edison
discovered that tape around the transmitter gave off a noise that resembled
the spoken word. He worked on this and ended up developing both phonographs
and what became known as the Dictophone, the really first voice recorder
that recorded to a wax cylinder. These wax cylinders recorded for a total
of an amazing two minutes.
Wax Recorder, 1910's
This is an early dictaphone that recorded to a wax cylinder. It was
huge, heavy and bulky but this was state of the art stuff for it's
time. The rounded shelving on the bottom of the stand was for storing
either blank or already recorded wax cylinders. To "erase"
a cylinder already used, you had a little peeling unit that simply
shaved the wax off the outside of the unit. Eventually, the cylinder
wasn't any good because too much wax had to be peeled off it. By all
means, you wouldn't want to get these ah too hot as they might ah
melt. Developed for business executives to sound out letters their
secretaries would then type, there isn't much doubt about the wax
recorder being used to audio record "evidence." Speaking
of business executives recording their letters and memos for others
to type, I have often wondered why all the time and expense was wasted
on this instead of requiring business executives to learn how to type
themselves. Of course, typing was a "skill" and also required
spelling skills. You can click here to learn more about
The Detective Dictograph, 1907
At about the same time that these wax cylinder recorders were being marketed,
a fellow by the name of K. Monroe Turner invented a listening device which
was a microphone that could be hidden with an amplifier and headphone.
It came to be known as the Detective
Detective Dictograph Audio Amplifier, 1907
The Portable Detective Dictograph Audio Amplifier from 1907 was made
by General Acoustic Company, Jamaica, New York and invented by one
K. Monroe Turner. This is one of the first audio amplifiers. Ads placed
in law enforcement and private detective trade journals (of which
there were very few at the time) claimed this this unit could be installed
and hidden just about anywhere. You know, under "rugs" and
"beds". This state-of-the-art equipment of it's time sold
for about $125.00. Remember that the average salary in America at
that time was about $750.00 a year. That means that this unit cost
about two months pay. The units could be rented for about $6.00 a
month. Several Congressman in Ohio and criminals in Los Angles quickly
went to prison from the evidence the Detective
Wire Recorders, 1920s
The Detective Dictograph was a revolution for it's time period but it
was a while before such equipment got hooked into what became known as
audio recorders. No doubt, there were some tries at using a wax recorder
to record sound from the detective dictograph but it just didn't work
out very well. There was something out there and private-eyes and law
enforcement soon found the device. It was called the wire recorder and
it recorded voice to a wire instead of wax. The wire recorder was invented
in 1898 by a Danish engineer by the name of Valdimar Poulsen and first
called the Telegraphone. Poulsen's intention was to sell the wire as a
telephone answering machine. It was technology that was way before it's
time. Poulsen had problems marketing the device and had great difficulty
explaining the practical use of the wire
recorder. A few machines were manufactured under his name just after
the turn of the century in Denmark. A decade later, the USA sold units
reasonably as office dictation machines. It wasn't long until law enforcement
and private-eyes found their machine.
Webster Chicago Wire Recorder
Big, heavy and bulky, the first Webster Chicago Wire Recorders were
a marvel to behold for their time. They would record audio and voice
to a wire spool. Used in conjunction with the Detective Dictograph,
private-eyes of the late 1930's had a dream come true. You could
now covertly record voice through a hidden microphone and collect
evidence in many ways. It took a lot to set these units up and you
needed a lot of space to hide them. Private-investigators in those
days made very good money covertly recording conversations of all
kinds for evidence. But this equipment was huge.
Wire Recorder, 1930's-1940's
This is a rare RCA Wire Recorder from the 1930's -early 1940s in a
black bakelite case. The item to the right is the wire cartridge that
would insert into the top slot. Like most wire recorders from this
time period, you had to purchase the wire recording cartridges from
the company that made the recorder. Nothing was standardized. This
was a tube recorder. Note the knobs on the front of the recorder and
the chrome grill. As you can see from the photo, this wire recorder
is in like new condition. When this wire recorder first came out,
it was hailed as a "portable wire machine" one could, ah....carry
around if you didn't have a bad back. Note the handle on the top that
pops up. Instead of reels of wire, this machine was easier and quicker
to use since all you had to do was side the wire cartridge in it.
Although audio recordings could now be done, prior setups was needed to
hide these huge machines in closets and under beds. It wasn't until the
Record-All of the mid 1930's came out that things got a little smaller
-Circa 1930's, 1940's
The Walkie-Recordall was a portable audio recorder that recorded to
a plastic type belt. The belt was called a Sonoband. The recorder
measures 10.5 x 5 x 9 with the thing closed up. A needle etched the
sound onto the Sonoband. The belt measures 16.5 x 1.75. The Walkie-Recorderall
was developed as a dictation machine. The idea was that salesman and
business people could carry the thing around and dictate memos which
could later be typed up into business reports on typewriters. However,
the Walkie Recordall never went over very well for that. However,
because of it's portability and recording power, it was quickly adapted
as a covert audio recorder by law enforcement and private investigators.
was highly popular in the 1930's and 1940's. It retailed for about $450.00.
That was a lot of money then considering the fact that the average sold
middle income paycheck was between $45.00 and $55.00 a week. That is over
two months pay for a recorder. If you make about $700.00 a week today,
this recorder would cost you about $5,600 by today's wage standards. This
tyoe of equipment was really expensive in it's day. Although the thing
measured 10.5 x 5 x 9 inches closed up, it was really small for it's time.
Portable Wire Recorders,
It wasn't long before state-of-the-art things changed again and recorders
got smaller and lighter. A company in Germany released a small wire recorder
in the 1940's and a revolution in small recording devices was started.
Portable Wire Recorder
The Minifon Portable Wire Recorder was state-of-the-art for it's
time. It recorded to a wire spool much like the bulky Webster Chicago
Wire Recorders did but this one was highly portable. Note that the
case is steel and not plastic. Back in those days, things were made
to last. The Minifon was released to be sold as a portable dictating
machine that traveling salesman could carry with them. Like the
Walkie-Recordall, it's use as a dictating machine did not develop
in mass market. Instead, it become a popular product for note-taking
by reporters, insurance adjusters, salesmen, private investigators,
detectives and others. It also became a popular bugging device.
The Minifon had a recording time of one hour which was very long
for it's time. The basic machine cost around $289.00. Considering
the fact that the average salary in 1940 was $1,299.00 a year, a
Minifon cost over four month's salary. Based on today's income standards,
it's cost in today's dollars would be around $12,000. If you had
one, you had some very expensive equipment.
The Minifon developed
with many accessories (see
brochure) including "long play" wire cassettes that
would record up to five hours, telephone recording attachments,
foot control, watch microphone, table loudspeaker, deluxe leather
carrying case, body harness and anything else the company could
come up with.
||For the covert
recording private-eye, spy and law enforcement market, the most popular
accessory for the Minifon was the watch microphone and the shoulder
harness. Now, instead of pre-setup time to hide bulky recoding equipment
under beds and in closets, these small units could be hidden almost
anywhere even on one's own body. The Minifon was then the first real
body recorder. The cord of the microphone stuck out the side of the
watch and would run up one's arm to the hidden recorder.
Equipmented Minifon Investigator
Pictured to the right
is an investigator wearing the Minifon with it's harness. The Minifon
watch microphone is on his left arm. You can see the wire running
up his arm. Although this would be rather crude by today's standards,
this was highly revolutionary in the 1950s. The Minifon became the
covert body audio recording system to have. It was sensational for
it's time period and every governmental spy, private-eye and police
department in the world wanted one. Those who could afford them
got them. Made in Germany, the company had authorized Minifon dealers
throughout the world and they were sold throughout the world.
Reel-To-Reel Magnetic Tape, 1940s, 1950s
Recording to wire was the only way to record audio unless you wanted to
use Thomas Edison's wax method which was a real problem in heat and in
long term storage ability. Wire spools had their own problems. The wire
was really thin and could tangle very easily. In the 1930's Bell Telephone
Laboratories had already invented a system of recording audio to magnetic
tape but it was never really marketed. It was not until 1947 that reel-to-reel
magnetic tapes started to be marketed in the United States. By this time
there were a lot of different kinds of wire recorders on the market. One
might think that there would be a compatibility problem but things were
quite different in these days. In fact, whatever type of recorder you
purchased, rather it be wax , wire or sonoband, you generally had to purchase
the recording media from whatever company made the recorder. Things where
just not standardized. One type of wire or brand would usually only work
with the one brand product it was made for. Once you recorded something,
the only way you could play it back was on the brand of recorder you recorded
it on. This was done a great deal of time on purpose because the different
companies making these recorders wanted you to purchase only their recording
media and not someone else's. Reel-to-Reel magnetic type started to erode
that somewhat when the tapes came out.
Magnetic tape reel-to-reel
took off simply because it was much easier to use than wire spools. The
companies that made wire recording equipment scrambled to convert the
product they had to magnetic tape. Minifon soon released it's own reel-to-reel
magnetic tape recorder which become quite successful. Those recorder makers
who could not make the conversion from wire recorders to magnetic tape
recorders quickly went out of business.
First Telephone Recorders,
It wasn't long before someone dreamed up a way to record telephone conversations
with some sort of mic. That was first done with what become known as an
induction microphone. That is, a cord with a suction cup on the end of
it. You would simply attach the suction devise to your telephone and the
vibrations (which is what a microphone picks up anyway) would record both
sides of a telephone call. Other innovations included running a secret
wire from the telephone junction box to headphones or a microphone with
a recorder in front of it that would then covertly record telephone conversations.
In these days, there were no laws against wiretapping and there was no
one and two party consent laws. Investigators were free to do whatever
they could do. Wiretapping and tape recording flourished. The 1950's become
the age of the small reel-to-reel magnetic tape recorder. Transistors
came into being and tape reorders started to get even smaller. Mohawk
Business machines released the first transistor tape recorder called the
Mohawk Midget Recorder, 1950's
Prior to about 1950, tape recorders had been mostly big and bulky.
With the exception of a few products like the Minifon most of the
"portable" ones where about the size of a typewriter.
They all used tubes. That all changed when the Mohawk Business Machines
Company of New York released what they called The Midget Recorder
around 1950.This was the first all transistor tape recorder. It
was about 6" x 10" in size and used a small tape cartridge.
Like many recorders of this time period, you had to purchase extra
tape cartridges from the company that made the recorder. There were
no standardized tape cartridges. The recorder was a modern revolution
for it's time and very small! If you were a private investigator
and had one of these back then, everyone in town marveled at at.
Recorders Got Smaller And Converted To Magnetic Tape
Cheaper Portable Reel-To-Reels, 1950's, 1960s
The problem with a lot of these high tech recorders where that they were
expensive. They therefore had a limited market. Only the highly successful
could afford them. If you had top of the line audio recording equipment,
you had an investment that might be about the same as four to six months
pay. It wasn't long before cheaper reel-to-reel recorders that worked
well but didn't cost quite as much hit the USA market and private-investigators
purchased them by the thousands.
Trix Portable Reel Recorder Set with Carrying Case
Phono Trix Portable Reel Recorder Set is what a typical portable
tape recorder was like in the 1950's. The measurements where 9"
width, 7" depth, 5" height in the case. Very bulky by
today's standards. Not only is the recorder bulky by today's standards
for a portable, note how big the microphone is. You had to plug
a speaker into this one for playback. As you can see, the speaker
was kept out of the unit to make it as small as it could be made
Miniature Tape Recorder, 1965
In the mid 1960's the miniature Phono Trix 88 recorder was introduced
in the USA and become a popular alternative to the Minifon because
of it's less expensive cost. It was only 1 7/8 inches X 4 1/4 inches
X 7 1/2 inches and was billed an a new pocket-size recorder. I guess
you had to have big pockets back then! It's weight was a mere 2 1/4
lbs. Like the Minifon, it was marketed through exclusive dealers and
had a number of "fascinating" accessories including a tie
clip mic, a pen mic, leather carrying case, stethoscope headphone,
amplified speaker, shoulder holster and anything else the company
could come up with.
Electra Candid Covert Recorder 1960's
The Electra Candid Recorder model 770 was a small portable recorder for
it's time. It came with a diamond (fake) incrusted tie tack pick-up mic.The
name might have been developed from the TV program Candid Camera in which
covert video was filmed and jokes played on people who were covertly filmed
for the TV show. At the end of the joke, old Allen Funt would tell the
subject, "Smile Your On Candid Camera."
Diamond Tie-Clasp Mic, 1960's
This covert tie-clasp mic was sold with The Electra Candid Recorder
model 770. Note the hole in the middle which is where the mic pickup
is. The diamond, of course, it not real. This was quite a covert
recording system for the 1960's.
Once the Covert Diamond
Tie-Clasp Mic came on the market, it was quickly copied by other
companies that made recording equipment and the market place as
always soon flooded with different types of tie-clasp mics but none
of them where quite as slick as the one pictured to the right.
Miniature Recorder, Mission Impossible, 1960s
Although there were several recorders used on the TV program Mission
Impossible, the most famous one is the Lloyds Miniature Recorder pictured
above. At the start of each show, actor Peter Graves would obtain
an envelope and a tape recorder that would contain details of his
current assignment which was another "mission impossible"
which only him and his team could do. The tape would self destruct
after it was played.
Pencorder Reel-To-Reel 1960's
The Olympus Pencorder Reel-To-Reel was a really small recorder for it's
time and this model was highly popular since Olympus was known for top
quality. Despite it's name, it was certainly a whole lot bigger than a
Reel-to-Reel tape recorders
flourished in the 1960's and 1970's. They continued to improve in quality
and kept getting smaller and smaller as well as cheaper and cheaper. History
always repeaters itself! The compact disk was developed by the Philips
Company of the Netherlands in 1962. The tape was self-contained in a housing.
Recording and playback was at 1/ 7/8 inches per second. Like almost everything
else that has to do with tape recording history, the Philips Company was
not prepared for the demand. The cassettes, like most other major changes
in tape recorders; were developed for dictation equipment. As it turned
out everyone wanted them. For a while many companies attempted to develop
equipment that would only work with their own tape recorders. Minifon
and and Channel Master were two of many companies that tired this.
Just Like Minifon,
Master Marketed A Cassette Recorder That Would Only
Work With Their Own Cassette tape.
The idea of making less profit
of the front end by forcing one to only be able to purchase cassettes
from the company that made the recorder was a not a new one. It went all
the way back to the time of wire and wax recorders. However, the more
successful companies standardized so a standard third party tape would
fit in their recorder. Many seen the handwriting on the wall as the market
place was demanding standardization. It soon become quite evident that
those who would not standardize recorders to specific cassette tapes would
soon be out of business. It wasn't long before cassette tapes became standard
and a tape recorded on one machine would fit in any machine.
Cassette Tape Recorders,
Cassette tape recorders in the late 1960's and 1970's flourished and flooded
the market place. There were thousands of different brands and models.
It wasn't long before micro cassette tapes came into being. It was at
this point that tape recorders got really small.
Automatic Long Play
With Automatic Telephone Recording Controls, 1970s, 1980s
In the 1970's and 1980's there was developed what can be termed long play
combo recorders that would plug into a telephone line. These recorders
were modified recorders in which the tapes were slowed down so one could
get more time out of them. Also installed in these recorders were telephone
recording controls. They could plug into a telephone line and only record
when the handset was picked up. The recording control was voltage regulated
in that the recorder would know when the handset was picked up and when
it was placed back on hook. In a completely enclosed recording system,
this permitted the recording to only occur when the telephone was in use.
Many of these recorders could also be used in a normal fashion. The Sony
12 Hour Long Play Automatic Telephone Tape Cassette Recorder was likely
the most popular recorder of this type because of it's superior end results
one could obtain.
12 Hour Automatic Telephone Tape Recorder
For simplified Automatic telephone recording in a long play format,
the ATR-12 really meets the challenge! With exclusive modifications
this unit offers excellent durability, unsurpassed long play sound
quality, and features not found on any other unit of this kind. Just
plug in to any standard telephone jack, place the unit in record mode
and its ready to go. When any phone line is picked up, the unit automatically
begins recording both sides of the conversation. The Sony work horse
is still sold today.
Voice Activated Tape Recorders
Voice activated tape recorders were developed so that tape recorders could
be turned on and off and only record when sound was present. This would
save the tape for various types of covert recording. In an ever increasing
number of features for tape recording products, the Spy
Exchange And Security Center introduced the R2D2 portable long play
automatic telephone tape recorder in the early1990's. Taking advantage
of caller ID technology, this recorder would not only record both sides
of a telephone conversation it would also log and time and date stamp
all outgoing dialed numbers and incoming caller ID information. The R2D2
was a huge seller in it' time. It's still sold today.
The R2D2 is a ten hour long play automatic telephone tape recorder
that records both sides of telephone conversations. The recorder goes
on and off as the headset is picked up and placed back on hook. It
also logs and keeps a record of incoming and outgoing numbers dialed
as well as the time, date and length of call. Simply plug the recorder
box in your phone line at the modular jack and it's ready to work
for you. You then have a full 5 FULL HOURS of quality UNATTENDED recording
time which also logs both incoming and outgoing telephone numbers
with time, date and length of call. Turn the tape over and you have
another five hours of recording time.
Micro Cassette Tape
Recorders, 1970s, 1980s
In was Olympus who released the first micro cassette recorder in 1969
and boy was it small for it's time.
Compact Pearlcorder L400 Micro
Ultra Compact Pearlcorder L400 was a classy tiny recorder for it's
time. In fact, it was one of the world's smallest recorders when it
was released but had high-end state-of-the-art functions. Because
of it's classy look, advanced functions and high end results, it became
a favorite recorder for private investigators in the 1980's.The Spy
Exchange And Security Center sold hundreds of these recorders in the
recorder's hay-day in the 1980's and early 1990's.
M-909 Auto Reverse Micro cassette Recorder, 1990's
Up until the the time the micro digital audio recorders came about,
the Sony M-909 was the world's smallest tape recorder. It was used
by private investigators and law enforcement for a number of different
types of operations. The M-909 measures a mere 2 1/2 inches X 2 inches
X 1/2 inch. It's features included voice activation and auto reverse.
Exchange And Security Center sold hundreds of these recorders
in the recorder's hay-day in the 1980's and early 1990's. The M-909
sold for about $495.00
Digital Micro Recorders, Late 1990's
It was in the late 1990's that digital recorders started to be produced.
For over a decade computers had always been able to conduct some type
of audio recording of one type or another. However, at the start of the
digital computer age, computers were generally too slow and digital memory
too small and expensive to really do any kind of audio recording suitable
to the needs of investigative use. As memory got smaller and cheaper to
produce, it wasn't long until small digital audio recording equipment
hit the market place. The advantage of using digital recorders that recorded
to memory over the old style analog cassette tape recorders is great.
First of all, digital recording produces a much better sound quality.
It can be duplicated without any loss of sound quality. Just as music
products started to move from cassette tapes to CD-Rom, tape recorders
developed into digital products. When you obtain audio in a digital form,
it can be quickly and easily analyzed a lot easier. Various audio forensics
can be applied such as digital
PSE (deception detection) as well as various forms of statement
analysis which has become a forensic science in and of itself. Moreover,
voice recordings in digital form can be enhanced, background noise removed
and they are much easier for adjustments in volume, filter and tone controls
that can be made. A lot of investigative agencies today have the forensic
software to do all this which was highly expensive to do just a few years
ago. There are even software programs today that can take a digital audio
recording and turn it into a typed transcript. That's something that was
highly expensive and time consuming to do in the past.
The first digital micro recorders
had to be plugged into a computer through the serial port which was time
consuming and it took a lot longer to download the digital audio to your
computer. As computers became standardized with USB ports, the digital
micro recorders started using a USB plug to transfer the audio.
Diasonic was a leader in this field in the early days of high end digital
audio recorders. Below is a photo of a very early Diasonic micro recorder.
Recorder, Late 1990's
This early Diasonic hand-held
recorder would record for an amazing 10 hours. It was highly superior
to the other digital recorders that were rather low end that has
come into the market place. The unit was voice activated, ran on
AAA batteries and could be plugged into a wall outlet. It also came
with a telephone recording control to plug it directly into a telephone
line. The Spy Exchange And Security Center sold hundreds of these
units.They retailed for over $400.00
The digital recorder
age seen a huge surge in the production of tiny digital audio recorders.
The overwhelming majority of them didn't make it simply because
they were too low-end and didn't work well. Other then Diasonic,
there were few digital recorder makers that were able to say in
business long. In the late 1990's the pen shaped recorder shown
to the left recorded for 8 full hours. It was quite a wonder for
it's time but the unit was simply shaped like a thick pen.
There was a time period between the late 1990's and early 2000's that
both small analog specialized long play and automatic telephone tape recorders
sold well along side the new digital micro recorders that did about the
same thing. At first, analog recorders out sold the digital tapeless recorders.
However, slowly digital recorders took over the market. Analog recorders
still sell today but the demand for digital tapeless recorders is about
100 to 1.
Third Generation Digital Recorders, 2000s
As research developed on digital tapeless recorders, the recorders got
cheaper and cheaper with more and more memory in them. They also developed
with better sampling rates and more features. In 2005 Diasonic released
a new generation digital tape recorder that had a much higher sampling
rate than the typical digital recorder. The small units were now just
a little bit bigger than a Bic cigarette lighter. Features include up
to 563 hour or recording time. That's an amazing 23 days! Just this year,
the new generation TinyTek audio recorder was released in 16, 32, 65 and
120 hour models.
Starting @ Only $159.95
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The Stealth Pen is a cut way above the run-of-the mill digital recorder
pens in the market place today! It looks completely like a regular
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clip on the pen, it starts recording. Push up the pocket clip and
it stops recording. There are no lights or buttons. You can actually
hand this pen to someone to sign a signed statement and they would
never know there is a high quality super sensitive digital audio
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18.5 Hour MicoDot Round Digital Recorder
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Recorders And MP3 Players
In the last year, digital recording and MP3 technology has developed
to the point in which recorders and MP3 players can be built into
working watches. These watches will record a little less than ten
hours and you wear them and use them just like a regular watch.
It's come a long way since the time of the Minifon watch microphone
that had a wire that went up your arm to a hidden analog tape recorder.
Today, there are several different models of watch recorders for
both the men and the ladies.
Click here to review them all.
Advanced Nano Digital Audio Recorder
In 70 Hour, 141 Hour And 282 Hour Models
Automatic Telephone Recording Ability
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If you want the world's very best digital audio recorder for investigative
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both the micro tiny design and the high end results you obtain in
audio evidence gathering. If you want a superior digital recorder
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HotTek Advanced superior to anything else on the market.
Digital MP3/Voice Watch Recorder
Wrist Watch MP3/Voice Recorder/Player
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watch with built-in digital recorder/player. 256Mb flash memory
records 9 full hours of voice via built-in microphone and/or dozens
of MP3 music files. Recording results is a cut above last year's
model because the sampling rate is greater and he new generation
mic built into the watch is much more powerful. You can record any
sounds within 30 feet! Highly functional for investigators, law
enforcement, journalists, attorneys, and business professionals
who must conduct interviews
Fourth Generation Digital Recorders
As tape recorders
developed, some developers lost their edge in the digital recorder revolution
and innovation. Several other manufactuers entered the market place. Soon,
a digital recorder had a micro SC card which would solve all the memory
probelms and let you remove the card, place another one in it for continued
use. Digital recorders got much better with more and more ways to store
it's memory. The micro SD card gave digital recorders the ability to have
just about as much memory and long play ability anyone would ever need.
Parts are now so micro sized, digital recorders can not be built into
almost anything. The standard digital telephone recorders now come with
patch cords and mics so you can also record cell phone calls. And the
evolution continues today.
Just like Thomas Edison himself
would be, you can be quite impressed also when it comes to an extensive
line of the world's best and most complete selection of digital and analog
audio recorders and accessories by checking out the subcatagories below.
If you are in the market for any type of audio recorder, you can check
out the links below or call our friendly customer service line at 512.719.3595.
Exchange & Security Center
9513 Burnet Road Suite 101, Austin, Texas 78758
Phone 512-719-3595, Fax 512-719-3594
When In Austin, Texas--Stop By Our Huge Showroom
2008, 2009, 2011
Thomas Investigative Publications, Inc. All rights reserved.
Thomas Investigative Publications, Trademark, 1981.
National Association Of Investigative Specialists, Inc, Trademark, 1986.
Spy Exchange, Trademark, 1999