24-07-2012, 04:00 PM
Speech Recognition Kit
[attachment=28748]
Introduction:
The speech recognition kit is a complete easy to build programmable
speech recognition circuit. Programmable, in the
sense that you train the words (or vocal utterances) you want
the circuit to recognize. This kit allows you to experiment
with many facets of speech recognition technology.
Features of the kit include:
Self-contained stand alone speech recognition circuit
User programmable
40 or 20 word vocabulary
Multi-lingual
Non-volatile memory back up
Easily interfaced to control external circuits & appliances
Speech recognition will become the method of choice for controlling
appliances, toys, tools and computers. At its most basic
level, speech controlled appliances and tools allow the user
to perform parallel tasks (i.e. hands and eyes are busy elsewhere)
while working with the tool or appliance.
The heart of the circuit is the HM2007 speech recognition IC.
The IC can recognize either 40 words, each word a length
of .96 seconds or 20 words, each word a length of 1.92
seconds.
Speaker Dependent / Speaker Independent
Speech recognition is divided into two broad processing categories;
speaker dependent and speaker independent.
Speaker dependent systems are trained by the individual who
will be using the system. These systems are capable of
achieving a high command count and better than 95% accuracy
for word recognition. The drawback to this approach is
that the system only responds accurately only to the individual
who trained the system. This is the most common approach
employed in software for personal computers.
Speaker independent is a system trained to respond to a word
regardless of who speaks. Therefore the system must respond
to a large variety of speech patterns, inflections and
enunciation's of the target word. The command word count
is usually lower than the speaker dependent however high
accuracy can still be maintain within processing limits. Industrial
applications more often require speaker independent
voice recognition systems.
Circuit Construction
The schematic for the SR-07 Speech Recognition Circuit is
shown in figure 1. The SR-07 utilizes three separate printed
circuit boards (pcb). The components are mounted on the top
side of each pc board. The top sides of the boards have white
silk screen component drawings. The components are soldered
on the opposite side of the pc board. After soldering the component
to the board any excess wire is clipped off.
Chip Installation
When installing integrated
circuit (IC) chips,
begin by first identifying
the top of the chip. The
top of the chip has a
marker, many times it is
a half circle cutout.
Sometimes it is a small
mark identifying pin 1
on the IC. In both cases
the marks show us the
top of the IC chip. Orientated
the top of IC chips with the white silk screen drawings
of the components on the top of the pc board (usually a half circle
cutout) or on the parts
placement drawings and install
the IC into their socket.
Display Board:
We start construction with
the display board, see figure
2. Mount and solder 16 (220
ohm) resistors, color bands
red-red-brown gold or silver.
Next solder two 14-pin
sockets for the LED display
on you use the command word “printer”. The circuit recognizes
the word and applies power to the printer. At this point
you can also turn on (or off) any other circuit connected to the
speech board, because when the high signal goes low the 4013
keeps its output high. When you are ready to turn off the
power to the printer all you have to do is repeat the command
“printer”. The second time the line is brought high, the output
of the 4013 is brought low.
The same command is used to turn the unit on and off. Any of
the other lines can be turned on or off without affecting the
status of the other output lines.
Voice Security System
This circuit isn’t designed for a voice security system in a commercial
application, but that should not prevent anyone from
experimenting with it for that purpose. A common approach is
to use three or four keywords that must be spoken and recognized
in sequence in order to open a lock or allow entry.
CPU Mode
The HM2007 speech recognition chip has a CPU mode to be
used when connected to a host computer system or microcontroller.
To interface the HM2007 to a host computer requires
the writing of driver software as well as designing and building
the hardware interface to the computer data buss.
Aural Interfaces
It’s been found that mixing visual and aural information is not
effective. Products that require visual confirmation of an aural
command grossly reduces efficiency. To create an effective
AUI products need to understand (recognize) commands given
in an unstructured and efficient methods. The way in which
people typically communicate verbally.
[attachment=28748]
Introduction:
The speech recognition kit is a complete easy to build programmable
speech recognition circuit. Programmable, in the
sense that you train the words (or vocal utterances) you want
the circuit to recognize. This kit allows you to experiment
with many facets of speech recognition technology.
Features of the kit include:
Self-contained stand alone speech recognition circuit
User programmable
40 or 20 word vocabulary
Multi-lingual
Non-volatile memory back up
Easily interfaced to control external circuits & appliances
Speech recognition will become the method of choice for controlling
appliances, toys, tools and computers. At its most basic
level, speech controlled appliances and tools allow the user
to perform parallel tasks (i.e. hands and eyes are busy elsewhere)
while working with the tool or appliance.
The heart of the circuit is the HM2007 speech recognition IC.
The IC can recognize either 40 words, each word a length
of .96 seconds or 20 words, each word a length of 1.92
seconds.
Speaker Dependent / Speaker Independent
Speech recognition is divided into two broad processing categories;
speaker dependent and speaker independent.
Speaker dependent systems are trained by the individual who
will be using the system. These systems are capable of
achieving a high command count and better than 95% accuracy
for word recognition. The drawback to this approach is
that the system only responds accurately only to the individual
who trained the system. This is the most common approach
employed in software for personal computers.
Speaker independent is a system trained to respond to a word
regardless of who speaks. Therefore the system must respond
to a large variety of speech patterns, inflections and
enunciation's of the target word. The command word count
is usually lower than the speaker dependent however high
accuracy can still be maintain within processing limits. Industrial
applications more often require speaker independent
voice recognition systems.
Circuit Construction
The schematic for the SR-07 Speech Recognition Circuit is
shown in figure 1. The SR-07 utilizes three separate printed
circuit boards (pcb). The components are mounted on the top
side of each pc board. The top sides of the boards have white
silk screen component drawings. The components are soldered
on the opposite side of the pc board. After soldering the component
to the board any excess wire is clipped off.
Chip Installation
When installing integrated
circuit (IC) chips,
begin by first identifying
the top of the chip. The
top of the chip has a
marker, many times it is
a half circle cutout.
Sometimes it is a small
mark identifying pin 1
on the IC. In both cases
the marks show us the
top of the IC chip. Orientated
the top of IC chips with the white silk screen drawings
of the components on the top of the pc board (usually a half circle
cutout) or on the parts
placement drawings and install
the IC into their socket.
Display Board:
We start construction with
the display board, see figure
2. Mount and solder 16 (220
ohm) resistors, color bands
red-red-brown gold or silver.
Next solder two 14-pin
sockets for the LED display
on you use the command word “printer”. The circuit recognizes
the word and applies power to the printer. At this point
you can also turn on (or off) any other circuit connected to the
speech board, because when the high signal goes low the 4013
keeps its output high. When you are ready to turn off the
power to the printer all you have to do is repeat the command
“printer”. The second time the line is brought high, the output
of the 4013 is brought low.
The same command is used to turn the unit on and off. Any of
the other lines can be turned on or off without affecting the
status of the other output lines.
Voice Security System
This circuit isn’t designed for a voice security system in a commercial
application, but that should not prevent anyone from
experimenting with it for that purpose. A common approach is
to use three or four keywords that must be spoken and recognized
in sequence in order to open a lock or allow entry.
CPU Mode
The HM2007 speech recognition chip has a CPU mode to be
used when connected to a host computer system or microcontroller.
To interface the HM2007 to a host computer requires
the writing of driver software as well as designing and building
the hardware interface to the computer data buss.
Aural Interfaces
It’s been found that mixing visual and aural information is not
effective. Products that require visual confirmation of an aural
command grossly reduces efficiency. To create an effective
AUI products need to understand (recognize) commands given
in an unstructured and efficient methods. The way in which
people typically communicate verbally.