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Speech Synthesis LSI Selection Guide
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Basic knowledge of audio data
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Listening to compressed audio data
Speech Synthesis LSI Selection Guide (Voice Memory Size Calculator)
Calculate the required voice memory size for your system!
We calculate the voice memory size of your product and propose the best LAPIS Technology Speech Synthesis LSI.
1. Enter the basic settings of the Speech Synthesis LSI
Grade: : | |
CPU I/F : | |
Play time : | |
* The playback time is a guideline at a sampling frequency of 8.0kHz with 4bit ADPCM2. |
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Memory type : |
2. Input memory specifications and calculate memory size.
Synthesis method |
Number of phrases |
Average length of sound |
Sampling frequency |
Approximate memory size |
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0 |
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0 |
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0 |
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0 |
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The total memory size for storing audio data is 0 Mbit |
3. We propose the following LAPIS Technology Speech Synthesis LSI that is most suitable for your system.
Data sheets |
Supply Voltage (V) |
Frequency Band (MHz) |
Oscillator | Operating Temperature (°C) |
ROM capacity (bit) |
Playback phrase count |
Maximum playback time(s) |
CPU I/F |
SP amplifier output (W)/class |
Mixing number (interna) (ch) |
Other | PKG | For automotive*1 |
Sample and Buy |
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- *1 : is for automotive use. can provide AEC-Q100 qualified products.
Type of synthesis method
Sampling frequency \ synthesis method | Description | Sound quality | Compression ratio | Play time (sec) * When the audio data size is 1Mbit |
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Bit rate |
Method | Human voice | Musics | Sound effect | Fs = 8kHz | Fs = 16kHz | Fs = 32kHz | ||
(Variable bit length) |
LAPIS Technology's unique method. This method enables high compression while maintaining high sound quality by changing the bit rate to a variable bit length. This is the higher-order method of the following 4-bit ADPCM2. |
High-quality sound | High-quality sound | High-quality sound | 1/5 | 40 | 20 | 10 | |
4bit ADPCM2 |
LAPIS Technology's unique method. The audio data is digitized at regular intervals, high compression is achieved by taking the difference from the previous data, and the sound quality is improved by improving the followability of the waveform. |
High-quality sound | Low sound quality | Low sound quality | 1/4 | 32 | 16 | 8 | |
8bit non-linearPCM |
LAPIS Technology's unique method. By recording 10bits near the center of the waveform, high compression and high sound quality are realized. |
High-quality sound | Medium sound quality | Medium sound quality | 1/2 | 16 | 8 | 4 | |
8bit PCM |
This is a general method. It is suitable for expressions such as music and sound effects, and for sound effects and pulse-shaped waveforms with sharp changes in waveform. |
High-quality sound | High-quality sound | High-quality sound | 1/2 | 16 | 8 | 4 | |
16bit PCM |
This is a general method. It is suitable for expressions such as music and sound effects, and for sound effects and pulse-shaped waveforms with sharp changes in waveform. |
High-quality sound | High-quality sound | High-quality sound | 1/1 | 8 | 4 | 2 |
- *1 : HQ-ADPCM is Ky's high-quality sound compression technology. Ky's is a registered trademark of Kyushu Institute of Technology.
Phrase description
phrase | Description |
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Sampling Frequency (Fs) |
When converting an analog signal such as voice to a digital signal, this is a numerical value that indicates how many times (quantization) should be performed for 1 second of data. |
Bit rate |
It is a numerical value when the amount of data uttered per second is expressed in bits. |
Number of phrases |
The number of types of sound to play. |
Sound effect
Synthesis method | HQ-ADPCM | 4bit ADPCM2 | 8bit non-linear PCM | 8bit PCM | 16bit PCM |
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32kHz |
PLAY | PLAY | PLAY | PLAY | PLAY |
16kHz |
PLAY | PLAY | PLAY | PLAY | PLAY |
8kHz |
PLAY | PLAY | PLAY | PLAY | PLAY |
Melody
Synthesis method | HQ-ADPCM | 4bit ADPCM2 | 8bit non-linear PCM | 8bit PCM | 16bit PCM |
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32kHz |
PLAY | PLAY | PLAY | PLAY | PLAY |
16kHz |
PLAY | PLAY | PLAY | PLAY | PLAY |
8kHz |
PLAY | PLAY | PLAY | PLAY | PLAY |
Guidance
Synthesis method | HQ-ADPCM | 4bit ADPCM2 | 8bit non-linear PCM | 8bit PCM | 16bit PCM |
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16kHz |
PLAY | PLAY | PLAY | PLAY | PLAY |
12kHz |
PLAY | PLAY | PLAY | PLAY | PLAY |
8kHz |
PLAY | PLAY | PLAY | PLAY | PLAY |
- * All copyrights of the sample audition sound source belong to our company and are protected by the Copyright Act. Unauthorized use of our sample listening sound source is prohibited by law.