![]() ![]() The voltage gain of this amplifier, which is an open loop is typically equal to 2000, determined R3 (feedback resistor) and R4 (input resistance), being of the order of 8.3 times. The entire assembly operates from a 9V battery (B1).Īfter being captured by the microphone, the voice signal is applied to the internal amplifier HT8950 through R4 C2 network. The system consists basically of a digital voice modulator and an audio amplifier, developed around respectively the chip IC1 (HT8950A) and IC2 (LM386I) the user's voice is captured by an electret microphone (MIC1) and reproduced normally or frequency offset in a dynamic speaker (SPK1). FVIB control output frequency vibrato16.VREF Reference voltage internal amplifier14.The following table summarizes the function of each pin for HT8950A version.No. The A / D and D / A work at a sampling rate of 8Khz, more than enough to cover the spectrum of the human voice (3Khz) and provides an output quality and very high signal to noise ratio (SNR). The HT8950 includes, among other functional blocks of an amplifier with internal polarization microphone, an A / D of 8 bits, a static RAM (SRAM) and a D / A converter 8 bits. You can replace the audio amplifier section with any other compatible amplifier circuit of your choice. The entire system operates from a 9V battery. However under both the outputs the voice is fed to the IC through a standard electret microphone and the dimensioned output is reproduced through a dynamic speaker. The first feature amongst the two modifies your voice with more tremulous while the second influences it simulating a robot kind of voice. The result can be compared to that obtained a playback speed of a vocal information recorded on a tape is increased or decreased, except that it does without affecting or distorting the sped of the speech, additionally it also adds two special sound effects: vibrato and robot to a sample speech. It does this by shifting the frequency spectrum associated with the voice therewith, upwards or downwards in seven incremental steps and the resultant output is heard as relatively much thinner or thicker in its frequency. The proposed digital voice changer circuit is exactly designed to do this for you, and quite more.īased on a voice modulator technology from HOLTEK, this voice changer chip digitally processes the fed voice signal in real time. Would you be interested to change the timbre of a person's voice at will and make it appear to be completely different to other people? Or modify it even like a robot or a being from some another planet? In many occasions we are able to recognize the presence of someone in a group or in a social gathering by just hearing to his or her voice, without even seeing the individual. How often we receive a phone call and simply by listening our interlocutor is able to know immediately who it is on the other side. ![]() The characteristic tone of every individuals voice is specifically unique in all circumstances. ![]()
0 Comments
Leave a Reply. |