Digital voice recorder on a single chip. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Digital voice recorder on a single chip. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Audio equipment

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I came across a very interesting series of microcircuits, produced by an office called Winbond.

The series is called ChipCorder - yes, yes, exactly Corder, not Coder - whose bright head came up with such a name is unknown to me. The devices themselves are ready-made devices for recording and subsequent playback of sound. For example, we will look at the ISD1400 sub-series. It has two microcircuits - ISD1416 and ISD1420. They differ only in one thing - the recording time. Guess how much where? Yeah, that's right - in one 16 seconds, in the other 20. Everything ingenious is simple - this is not the marking of processors for you.

So, what do the bright heads of comrades from Taiwan promise us? The main parameters are as follows:

Supply voltage - 5 volts;
Current consumption in "sleep" mode - 1 uA;
Playback activation - manual on the button or on the front of the pulse (from the microcontroller or something similar);
Automatic entry into sleep mode after the end of recording / playback;
Addressing for storing and playing multiple messages;
Data security for 100 years (did not check, I think you are also unlikely to succeed);
100000 overwrite cycles;
Internal clock generator;

All these goodies are housed in a 28-foot case in two versions - PDIP and SOIC. There is also an industrial version (there is a lower limit of the operating temperature as much as -70 degrees Celsius).

Now let's move on, perhaps, to a substantive discussion of the possibilities, for which we look at a typical circuit for switching on a microcircuit:

(click to enlarge)

Let's quickly jump to the conclusions.

A0-A7 have a dual purpose: the first is addressing in the presence of several messages and the second is switching the operating modes of the microcircuit. SP+, SP- - do not rack your brains - these are pins for connecting a dynamic head with a resistance of at least 16 ohms, which will reproduce what is recorded in the womb of the chip. MIC, MIC REF are designed to connect a microphone (electret). AGC (automatic gain control) - automatic adjustment of the recording level (ARUS according to ours). ANA IN - if you do not need to write from a microphone, then a signal from any other source is fed to this input. ANA OUT - output of the internal preamplifier. PLAYL - If this pin is driven low, playback will begin and continue as long as the low level is maintained. PLAYE - playback starts when a pulse arrives at this input and ends at the end of the message. RECLED - an LED is hung here to indicate the recording. XCLK - input for an external clock generator. REC - when a low level signal is received, recording begins, which will continue as long as the low level at this input remains. For those who do not have enough of such a description, I will send you to the datasheet, which can be downloaded for free from the site indicated at the beginning of this presentation.

Well, everyone else can move on to consider the operation of the circuit. Although here to consider something ... but oh well.

We press the button S3 - REC - a low level is formed at the REC input and recording begins. We release the pressed button - the recording stops - that is, the recording goes only when the button is pressed. Further, if we want to listen to the recording in the same way as we recorded it - that is, pressing the button with all our might, then press the S1 - PLAYL button and listen to the recorded. As soon as the button is released, playback stops. And finally, if we want to listen to the entire message as white people, then press the S2 - PLAYE button - in this case, playback will stop at the end of the recording. In general, it seems to me a very, very convenient thing for organizing any kind of entertainment and more. How about you, for example, a doorbell that will yell "Owl, open, the bear has come!" or a flower pot, reminding you with the voice of your beloved mother-in-law that it needs to be watered - in short, there are a lot of applications.

Publication: radiokot.ru

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