In the electronic literature published a lot of different schemes for residential calls. They usually play only fragments of melodies and imitated the singing of birds. Currently produced chips that can repeatedly record and reproduce information, both voice and music.
Time recording and playback circuits can range from 10 seconds to tens of minutes. For my design I used a device based on the chip ISD1210P [IV]. Time recording and playback is 10 seconds, which is quite enough for a room call. In this chip, you can record the synthesized fragment (music and speech) from computer's sound card, with a tape recorder or microphone. The retention period of the recorded information of the IC ISD1210P is about 100 years. The number of write cycles of approximately 100,000.
This chip contains ADC and DAC, RAM, clock generator, microphone amplifier, audio line input and output. Since the device has no built-in amplifier AF, it is possible to employ the amplifier AF any schematics. In my scheme applied common AF amplifier on the chip KUN and assembled according to the scheme given in [1].
A schematic diagram of a recording and reproducing blocks of flats combined into one call and is shown in figure 1.
(click to enlarge)
In Fig. 2 shows the node information recording from the microphone and in Fig. 3 shows the power supply and control door button SB2.
The unit of recording and reproduction of information consists of chips DD1 ISD1210P and AF amplifier DA3 on the chip CAN. The inclusion of the chip DD1 model. The power from the power source +5V., collected on the chip DA1 CREA. The recorded signal information is supplied to the chip from the line output of a tape recorder or sound card through the Line IN connector and coupling capacitor C3 to the leg 20. To ensure that the information was recorded, it is necessary to DD1 chip to apply power and press the button SB1, then feeding the signal to the input Line IN. Button SB1 should be non-latching. If information to be recorded from microphone, it is necessary to gather the node in Fig. 3 and connect it to the corresponding pads on the circuit Board. The write operation from a microphone as well as with the linear output of the reproducing devices. When using chips ISD1210P, the entry in both cases should not exceed 10 seconds. When recording with a microphone you can also use the schematic shown in [III] Fig. 2. The BM1 microphone-electret FEM-332. You can apply import DH9767, SZN-15E or similar. Microphone circuit must be shielded. When connecting the microphone BM1, must be observed polarity.
In my version was recorded in a microchip combined fragment the sound of the Gong and voice. First, in any music editor that supports writing notes and listening to recorded the sound of the Gong. I used a music editor FINALE 2003.
With this editor, I convert the "Sounding Gong" in the MIDI format, and then, with Converter, MIDI to WAV is a program AwaveMus.exe) convert to WAV. The program can be found on the website www.fmjsoft.com.
Then I use the program to play the entered text into the computer (Govorilka.exe).
This program can do the following:
Govorilka is a free program that reads a text with different voices in different languages, using our voice engine ( text-to-speech engines installed on your computer.
Main features
- Voice recording in WAV and MP3 file in accelerated mode.
- Easy to top up the pronunciation dictionary.
- Auto-scrolling text (monitored current read position).
- Reads the clipboard.
- Saves the text and the cursor position when you exit the program.
- Text size almost unlimited.
- Height adjustment of the voice and reading speed.
In the program I enter the text: -" the Lord. You" and when you play to achieve the most natural pronunciation and then record it in WAV format. Thus we get two independent file in WAV format. First - the sound of the Gong, the second contains the text. (Options, text entry can be set). The next step you use Sound Forge XP Studio , which can be found on the website www.sonicfoundry.com. Using this program files "Gong" and "text" in WAV format are mixed, edited, and combined in one. WAV file. I have it takes about 80KB. At the beginning of the file 1 second recorded signal with any frequency up to 18 Hz. This is to ensure that during playback of the Gong, don't cut the start of the text. Signal up to a frequency of 18hz is not heard by the human ear, but affects the operation of the control device of the relay.
The PSU has no peculiar features and assembled in traditional layout on a chip of DA2-CREA. When you press the doorbell button SB2 turns on the power to the device and control the relay with the pin 15 of the chip DD1, through the capacitor C22, the transistor VT1 and chain VD3, R17, R18 signal. Output 1 chip DD2.1 appears log.1 and passing through the transistors VT2, VT3, makes trigger relay 1 for the closure of the contacts K1.1 and K1.2. After finishing playback, after a few seconds, the output 1 of the chip DD2.1, there is a voltage log.0 which causes a trigger relay: 1 for the break contacts K1.1 and K1.2. Thus the call is completely disconnected from the network. With the unit control relay can be found in [II].
Reproduction of the fragment amplified using the unit assembled on the chip CON Fig. 1. Amplifier CAN included in the model scheme, with the introduction of corrective chains to reduce % s. I. [1] and features in the setting has not.
The signal comes with DD1 chip, through the capacitor 4 on the volume knob R6 and through a chain C8, R7 to the input of the chip. Chip is powered by a voltage of 9V., remove from the circuit output DA2 and capacitors C20, C21. This same voltage is applied to the diode VD2 and the input circuit DA1. To reduce the size of the structure, instead of the AF amplifier DA3, you can use the chip from the phone - AKRON. The scheme of inclusion shown in [III]. To use this chip or other AF amplifier, it is necessary to redesign the circuit Board. The printed circuit Board of the unit of recording and reproduction of the fragment shown in Fig. 4, PCBs site record with microphone and power supply were developed.
Instead of a chip of DA1 CREA you can apply the analogue of imported chips series 7805, and chips instead of DA2 CREE chip series 7809.
Literature
P. S. the Advantage of this design is ease of manufacture, relative (average 118 rubles) low cost chip ISD1210P. What this chip can record the synthesized fragments. Circuit and construction details are not scarce. Subject to the accuracy of installation and the availability of serviceable parts, adjustment of the device is minimized. Basically it is the AF amplifier on the chip CAN [1]. Button SB1 is temporary and is used only at the time of recording DD1 chip. In idle state the device is disconnected from the network.
Author: Patrin Anatoly N., Kirsanov, Tambov region; Publication: www.cxem.net