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HT84192 Datasheet(PDF) 11 Page - Holtek Semiconductor Inc |
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HT84192 Datasheet(HTML) 11 Page - Holtek Semiconductor Inc |
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11 / 31 page  HT84XXX 11 April 26, 2000 Functional Description The Magic VoiceTM series is a series of program- mable speech synthesizers and melody genera- tors. It provides various sampling rates and beats, tone levels, tempos for speech synthe- sizer and melody generator. For voice synthe- sizer, the Magic VoiceTM provides 8-bit PCM, 6-bit m-law PCM and 4-bit ADPCM synthesis. In HT84XXX series, a mixed output of two channels PCM synthesis is allowed but only one channel ADPCM synthesis is allowed. For melody generator, the Magic VoiceTM supports a tone melody and PCM melody generator and two channels mixed output for the whole series. The Magic VoiceTM series build-in 8 program- mable I/O pins and 4 programmable input pins along with powerful user¢s command. The user¢s instructions are employed to develop new and customized functions for a wide vari- ety of innovative applications. Speech and melody analysis The speech and melody sources of the Magic VoiceTM can be recorded and edited from the PC sound card and media tools. Holtek¢s CAD tools first load a speech source file as .WAV or .PCM format, then transfer the speech file as PCM, LOG-PCM or ADPCM format, and finally save it to the internal mask ROM by changing a layer of the mask. The PCM format generates a higher sound quality whereas the ADPCM for- mat brings about a longer recording capacity. The melody source can either be in the .MID or in the .MLD format. The .MID file is the standard format of the win- dows media tools. The .MLD file is a text for- mat. After the .MID file is compiled, the .MLD file is automatically generated. The Magic VoiceTM can support the following compression format of the voice .WAV and .PCM file: AD4, PCM8, m-law PCM. Current type D/A output The HT84XXX series supply two high accuracy current type D/A output pins for audio output. The output volume is changeable from 0 to 15 digital levels by writing a value to the VOL- UME_n (n=1 or 2) registers. The D/A pins are PMOS open drain structure and ouput synthe- sized signals for driving a speaker through an external NPN transistor when the chip is ac- tive. However, it becomes floating when the chip is in the standby state. An 8050 type tran- sistor with hFE=150 is recommended for the output driver of the D/A output pin. Melody/Tone generator The HT84XXX family has a built-in mel- ody/tone generator. The generator can generate 13 different kinds of melody beats, 5 octaves of tone level, 18 tempos, and 2 channels mixed output. Of these components, the melody tempo is changeable and generates sound effects by writing a control value to the TEMPO register. The chip provides the following 18 tempos, 13 beats, and 5 octaves for user¢s programming. · 18 tempos (Beats/Min.) 68 78 82 93 100 105 109 114 119 125 132 139 147 156 179 192 227 310 · 13 beats 1 24, 1 12, 1 8, 1 6, 1 4, 1 3, 1 2, 2 3, 3 4, 1, 4 3, 3 2, 2 · 5 octaves C1~B1, C2~B2, C3~B3, C4~B4, C5~B5 PCM/ADPCM synthesizer The HT84XXX family contains a PCM and ADPCM synthesizer. The synthesizer offers a wide range of sampling rates from 4kHz to 24kHz for PCM synthesis and 4kHz to 16kHz for ADPCM synthesis. The sampling rate of the synthesizer can be changed by writing a control value to the sampling rate register. It also sup- ports a small variety of 100Hz. For a higher performance sound quality, the PCM coding is required. But for a longer recording capacity, the ADPCM coding is recommended. |
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Similar Description - HT84192 |
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