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Introduction
The signals that come from the
telephone lines are just analogue signals. On the contrary, a computer can
handle digital signals only. Therefore analog signals must be converted to
digital signals before they can be processed by a computer, and digital signals
must be converted to analog signals in order to be heard with human beings.
When an analog voice signal is digitized (converted to digital format via A/D
conversion), it becomes so called “digital voice”.
Digital voice, as well as other kids
of computer data, consists of bits of “0” and “1”. It can be stored easily in a
computer but may require much more storage space than other kind of data. For
example, if the voice is digitized at 64 Kbps sampling rate with no
compression, then 100MB of memory can store 3.47 hours of voice. Many
compression techniques have been invented to reduce the massive storage
requirement of digital voice. Each technique has its own pros and cons, but
very few achieve high compression rate without sacrificing the voice quality.
Our system uses state of- the-art voice compression technique invented by
Dallas Semiconductor to achieve a compression rate of either 4:1 or 8:1. The
4:1 compression rate is highly recommended because not only the storage
capacity is quadrupled (100MB = 13.88 hours) but the characteristics of the
voice is also preserved.
The design of a voice recording
system is critical when communications must be recorded for legal or other
reasons. Important design issues which must be addressed include how to
preserve recordings accurately, how to store and retrieve recording efficiently,
how to maintain system security, and how to reduce physical size yet still
provide maximum recording and backup capacity. The Archivist voice logging
recorder is built on our 10+ years of voice technology experience and designed
with state-of-the-art components.
System Features
Patented all-in-one case design
Our
Recording and Monitoring Systems are housed in compact, industrial strength
metal cases 19 inch standard rack. Most components, such as CPU card and voice
card, are plug-in type. In the Case, storage devices, backup devices and power
supplies are slide in on tracks and fixed inside the case. On the back of the
case for the Recording and Monitoring System is a terminal panel which makes it
easy to install and service a large system with many wires. Overall, the
System’s case design is a major breakthrough in terms of space saving, easy
maintenance and easy installation.
Windows
NT/2000/XP/2003 server operating system
The
Recording and Monitoring software works under the powerful Windows
NT/2000/XP/2003 server operating systems and provides user friendly interface.
It supports system networking so that remote Net Play terminals can be used to
retrieve voice records.
FIFO hard disk
recording method
The
Recording and Monitoring software uses hard disk for primary storage, and
DVD-RAM disk or DAT tape for backup storage. Since the primary storage is used
in a cyclic manner, backup storage may not be necessary in some applications
where backup retention period is short. For example, when the system is
equipped with a 40 GB hard disk, the primary storage is about 5320
channel-hours before new data over-writes old data. If records older than 5320
channel-hours need not be stored, then backup storage is not necessary.
Two storage devices
can be used in series or in parallel
Up to two
hard disks can be installed in the System, and they can be used either in
series or in parallel. When used in series, the disk capacities are added
together. When used in parallel (by way of mirror box), data will be written to
both hard disks to protect the system from data loss due to hard disk failures.
Use DVD-RAM or DAT
for backup
The
search/access time of DVD-RAM is much faster than DAT, but the cost is higher.
Current capacity of DVD-RAM is 4.7 GB or 9.4 GB (double size). DAT tape
capacity is 12 GB (with DDS-3 drive) per tape not recommended.
Also
using backup H/D or flash memory is highly recommended.
Serial and parallel
operation of backup devices
Two
DVD-RAM drives or two DAT drives can be used in series for combined capacity.
Maximum capacity is
64 channels
The
maximum capacities for the system are 64, 36, 24 and 6 channels respectively.
However, one channel must be dedicated for playback purpose unless Net Play
terminals are used to access voice records over local area network (LAN).
Real-time on-line
channel monitoring
The
System allows live monitoring of any channel via the Replay Channel. However,
since the Replay Channel is also used to play voice records, both operations
cannot proceed at the same time.
Each backup disk or
tape has its own archival information
When the
data on a backup media is no longer needed, the backup media can be re-used. In
order to facilitate backup organization, each backup media will be recorded
with a unique serial number, the date of first use, the number of times it has
been re-used and other basic information.
Records are saved
with date, time and other information
Every
voice record is saved with channel number, date, time, length, dial-out number
(if any) and Caller ID (if any). Among them, channel number, date, time,
dial-out number and caller ID can be used as search keys to retrieve records.
Search and retrieve
recordings at any time without affecting the operation of the system
Whether
the record is on the hard disk or on the backup device, it can be retrieved at
any time without affecting the system operation.
Individual record can
be selected for secondary backup or deletion
Any
individual record can be selected, along with notes, for a secondary backup to
devices such as a floppy disk and etc.
Flexible working
hours
Up to
three different working hour ranges can be configured for the system. The
system will not record when the time is out of the ranges, but other operations
are still functional.
Fast search and fast
play functions
When
searching for a particular record, the user can use the record’s Start
Time/Channel Number/Dialed Number/Caller ID (one or more of the above) as the
search key. After a few minutes, the system will list all records matching the
key. The desired record can be easily selected and played by using commands
such as fast forward, rewind, move up and move down.
Channel grouping for
greater flexibility
Under
certain circumstances, it may be desirable to partition the channels into
different task groups. The Archivist allows for such grouping with different
names, passwords, and backup devices
Independent channel
configuration
Each
channel can be configured independently with its own User Name, Extension
Number, Activation Method and etc.
Main screen menu
shows channel status and storage usage
The
Archivist displays the status of all channels and the storage usage (percentage
used) on the main screen menu, making it easy for the system manager to monitor
the operation.
Automatic self-test
on regular basis
As an
intelligent recording system, the Recording and Monitoring software is capable
of automatic self-testing on a regular basis. If any problem or abnormality is
found, the system will generate an alarm for the system manager.
Screen warning,
verbal alarm, and optional remote notify
Based on
the cause of an alarm, the system will report in different manners. If the
problem is small, only a warning will be displayed on the screen. Otherwise a
verbal warning will be sent to the internal speaker. If the system is
optionally equipped for remote notification, then the warning will be sent
through a phone call.
Voice (VOX)
activation or loop voltage start
The
System can be connected to a variety of communications circuits such as
telephone lines, extension lines, ring-down direct lines and radio channels. In
order to adapt to different electrical interfaces, each channel can be
configured as voice activation (VOX) or loop voltage start on an individual
basis.
System self-test
capability
The
System can perform energy analysis on each channel and help determine whether
the problem comes from the system itself or from the communications circuits
that it is connected to. This unique feature helps the service technician to
trouble-shoot the system quickly and easily without using bulky test equipment.
System expansion
capability
Although
the maximum capacity of a single Recording and Monitoring unit is 64 channels,
systems of larger capacity can be built by networking multiple Recording and
Monitoring units together via LAN.
System Specifications
Working Platform
Hardware Industrial
PC with Color Monitor, all in one case 19
inch Standard Rack as shown
Operating System Windows
NT/2000/XP/server 2003 and all windows Platforms
Telephone Interface
Type CO normal telephone lines
Connection RJ 11, Tip and ring in parallel
Input Impedance > 20K Ohm (high Impedance, then low load
on
Telephone lines)
Networking
Availability Archivist VER1.0, Recording and Monitoring
System VER2.0, Redundant Recording System VER3.0
Interface Peer-to-peer, 10BASE-T, Serial RS232
Voice Recording
No. of Channels up to 64 Channels –
channel #1 for Playback only
Expandable to unlimited no. of Telephone
lines (system Cascading)
Volume Level -40 dbm to +9 dbm, AGC
> 40 dB
Compression Rate 4:1 (default)
or 8:1 u-law PCM (Pulse Code Modulation)
Storage Capacity 66500 channel-hours (2x250 GB hard disk),
Expandable
Activation Voice (VOX), loop voltage
Storage Equipment
Storage Devices 2 hard
disk (2x250 GB)
Backup Devices DVD_RAM disk (4.7 GB, or 9.4GB double size)
DAT tape (2 GB to 12 GB) not recommended.
Removable
hard disk 250 GB or flash up to 8 GB
highly recommended
Voice Playback
Playback
Channel Channel #1 is always dedicated as the Replay
Channel
Monitoring Live monitoring for any channel via the Replay Channel
Output Device speaker, earphone jack, re-record jack
System Alarm
Warning Types Voice card not responding
Backup device is
full
Abnormal activity
Max. Recording
length exceeded on a certain channel
Base System not
Recording
Warning Method Screen display
Verbal message from
speaker
Phone call to remote
location (via specially equipped
channel #2)
Environment
Temperature Operation 5OC
to 40OC,
Storage -20OC to 60OC
Humidity 80% max.
Power Supply
AC
Power Supply 90 ~ 130 or 180 ~ 240 VAC, 47 ~ 63 Hz <
400W
UPS (Un-interruptible Power Supply) required
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