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7.7 Speech-controlled R/C car
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The voice-controlled mobile robotic platform is shown in Fig. 7.7. The circuit board on the robot looks a little different than that in Fig. 7.4. The reason for this is that I happened to get a prototype of the latest revision of the speech kit. The latest revision makes interfacing to the SRC easy. There are nine PC holes [for a pin header (two 4-bit nibbles plus ground)] that connect to the output of the onboard 74LS373. The output of the onboard 74LS373 is the upper BCD used for word-error detection and the lower BCD used to activate the 4028. A trigger signal is available by the red LED. In addition to the interface hookups, the board has a 3V input for memory backup. This makes the static RAM on the speech board nonvolatile. So you can turn the board on and off without losing the words programmed in the static RAM. In the original version, when you turned off the power, you lost the words programmed in the RAM.
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Project 3: General speech-recognition interfacing circuit
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The speech interface to the mobile R/C car is a specialized application. The next interface circuit (see Fig. 7.8) is a more general circuit and lends itself to controlling a variety of devices that include robots, electric circuits, and appliances.
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Speech-controlled mobile robot
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7.8 General interface circuit for speech-recognition circuit
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To keep the interface circuit from becoming too large and at the same time to enhance the robustness and accuracy of the SRC, we will again limit the interface to control 10 on/off switches. If you need the full 40-word vocabulary, you can design the interface circuit by expanding the circuit ideas illustrated in this chapter. Using just 10 on/off switches allows us to use four word spaces for each target (command) word, as before. Each of the four word spaces assigned to a target word will hold a slightly different enunciation of the target word. With four different enunciations of each target word, the SRC becomes more robust and word recognition accuracy increases. We choose the word spaces as before, so that the LSD of any four target (command) word spaces is the same. An example will make this programming scheme clear. Suppose we are making a voice control for an electric wheelchair. We decide to use the following list of command (target) words:
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Forward Backward Left Right Stop Sleep On Lock Unlock Stop (The command stop is so important in this application that it may take up more that one command position.) The first command we want to train the circuit to recognize is forward. We will use the following four word spaces: 10, 20, 30, and 40. By dropping the most significant digit (MSD) of each number, we are left with the LSD that is the same for all four word spaces, word number 0. Similarly the next command word, backward, will use word spaces 01, 11, 21, and 31. Dropping the MSD again, we are left with word number 1. The interface must recognize the word error codes and not mistake them for word numbers 5, 6, and 7. The circuit uses two 4011 NAND ICs configured to operate as OR and AND gates (as shown in Fig. 7.8) to detect the 55, 66, and 77 word errors.
Connection to speech kit
The speech-recognition kit has nine solder holes between the 74LS373 and 7448 chips for connecting an interface circuit (see Fig. 7.8). Eight lines represent the two BCD numbers, and the ninth pad is a ground. There is also one open pad by the red LED. A wire soldered here is used as an input signal to a word trigger for the interface circuit.
How it works
To begin, the interface circuit must be able to react whenever the SRC hears a word. When the SRC hears a word, it attempts recognition and the red LED blinks off momentarily. The current to the LED is used as a word trigger. To use this as a trigger, we set up a comparator connected to the cathode side of the LED. The reference voltage for the comparator is set at 3.64 V using a voltage divider consisting of two resistors, 5.6K- and 15K-ohms.
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