Voice coding chip with diversified functions

Tag: sound effect codec

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Due to the increasing number of portable products, the functional requirements for sound effects broadcast are increasingly required to achieve high sound quality output. In fact, there are quite a few audio voice solutions on the market, but updated. The blessing of technology makes the output capability of these audio-visual speech codecs as good as the quality of CDs, and even if built-in high-end processors, it can also provide functions including digital analog conversion, debugging, and system control.

However, from the basic architecture point of view, for digital audio data processing, the various functions built in now are not absolutely necessary, because these jobs can use one or more digital interfaces, through external powerful The processor is going to work, but because of the cost and thin and light application considerations, some companies have adopted a strategy of building the processor into the audio-visual codec chip. As for the advantages and disadvantages, it is determined by personal opinion.

Choose a wide range of codecs based on different applications

Although the built-in processor can perform higher-order arithmetic processing inside the chip, for the output sound quality, a new generation of technology is needed to support it. Currently the most commonly used is Pulse Code Modulation (PCM) compression technology, which is a common data format for PCM technology. It uses binary digital sampling and is most commonly used for uncompressed audio data, but due to high quality audio. Sampling including rate and length is required to be relatively high, so for PCM technology, the sampling rate is mostly 48 kHz.

The error pulse code modulation (DPCM) compression technique, because there are only two consecutive sampling differences, no matter how high the resolution of the original data is, DPCM technology always uses 4 bits to store, so there will be certain data. The degree of loss.

The new generation of error pulse coding modulation compression technology ADPCM is basically evolved from DPCM technology, so the working principle is similar to DPCM technology. The big difference between the two is that ADPCM technology can predict subsequent sampling values, that is to say After a series of sampling, the ADPCM technique can perform operational analysis to predict the value of the next sample, and then determine the difference between the actual value. Such a technique requires a higher-order microprocessor to assist the operation.

A Law PCM and u LawPCM technology is basically the same as PCM technology, there is a certain degree of loss for data, but Law PCM uses nonlinear quantization technology, and the sampling method is to use low amplitude sampling, which can The sampling is reduced to 8 bits with a bit rate of 64 kbit/s. The accuracy of performance can be higher. Of course, high-quality 16-bit linear quantized speech sampling can also be used, which also reduces the number of samples. At present, the codec technology of A Law PCM and u Law PCM is widely used. The difference is that the application of the US-Japan system is based on u Law PCM technology, while the A Law PCM technology is used by countries such as the European Union.

Voice coding chip with diversified functions

• Holtek's voltage output DAC sound quality is better than the general current output type

Voice coding chip with diversified functions

The HT86 series is a high-efficiency audio playback solution introduced by Holtek Semiconductor several years ago. It contains the standard 8-bit controller and is equipped with a high-resolution mono 12-bit DAC, 24 I/Os, and external interrupts. , external reset, Real Time Clock, the function is very flexible. Applicable to all kinds of high-quality voice products, HT86 series adopts voltage output DAC, so it is better than general current output type in the sound quality part. If the user edits with EasyFormat, according to the index variable limit, the maximum can be 256-segment voice. In terms of compression format, 8-bit PCM, 6-bit uLaw PCM, 4-bit ADPCM are supported. In the built-in VOICE ROM part, it also provides other uses, can be used for other data storage, read data through the corresponding address and data buffer, in addition to the newly released HT86030, HT86070 chip, in addition to features In addition to the original HT86 series, because the I/O is reduced to 16, you can save a group of 16-bit timers and Real Time Clock, making it competitive in the cost part. In addition, in terms of product development, the HT86 series supports assembly. Language and C language, and using Holtek's HT-ICE as a development environment, can make product development faster and easier.

• OKI built-in P2ROM to further reduce costs

Voice coding chip with diversified functions

The voice chip is the main product in the OKI semiconductor division. In this respect, OKI has 25 years of rich development experience, providing users with solutions designed with soft and clear sound quality and easy-to-use applications. Home appliances, digital products, automotive electronics, security protection, communications applications, medical beauty, toys, and more. And in 2006, the company built a P2ROM built-in product, which further reduced the cost and achieved high-quality, low-cost product features.

The ML2250 series is based on Mask Rom and Flash. It has built-in 14bit D/A Converter and Low-Pass Filter to support dual-channel applications. In addition to internal stored voice data, it can also provide external voice data input. Way, for voice playback, in the aspect of playback decoding technology, ML2250 series can support STRAIGHT 8bitPCM, Non-linear 8bitPCM, STRAIGHT 16bitPCM/2bitADPCM2/4bitADPCM2 playback selection, and also has the function of volume adjustment, if through the interface The external amplifier and CPU can be connected to complete the mix synthesis.

• ROHM's BU6922KV/BU6934FV for various home appliance applications

ROHM is constantly launching a new generation of products for automotive electronics, game consoles, audio-visual products, home appliances, etc. The BU6922KV/BU6934FV audio-visual playback chip is a solution for various home appliances that are mainly air-conditioners and washing machines. Solution, the BU6922KV/BU6934FV uses a 16-bit DAC as the core to provide a relatively high sound quality similar to CD, and ROHM has added a unique compression technology in the chip, which can store traditional products in the capacity of only 4Mb ROM. 4 times the playback data. In support of the ADPCM codec part, ROHM's ADPCM codec solution can be applied to existing systems, allowing users to load audio and sound functions into the device with fairly convenient functions. The sampling frequency can also be set arbitrarily without the need to attach additional microcontrollers. In addition, ROHM has introduced an MP3 decoder chip that supports USB host. It integrates USB2.0, headphone amplifier, MP3 decoder and controller in the chip, making it easier to connect with USB flash memory, so it is quite easy to use. CD players, mini-play products, car stereos and portable players.

• Seiko Epson's S1V30300 creates a high voice quality system with a small amount of data

Seiko Epson has developed a new generation of voice navigation audio decoding chip S1V30300 for embedded applications. The chip is an auxiliary chip that supports Epson's PC tool and can provide voice data received by the user from the host. Record and compress, decode, etc., and use the integral D / A converter for output; S1V30300 has 16kHz and 8kHz sampling frequency and 21kHz single frequency input, the power supply voltage is 1.8V, I / O voltage is 3.3V. Because the S1V30300 uses a frequency-synchronous serial interface protocol, it can be easily integrated into a variety of host devices and microcontrollers. The S1V30300 chip supports AAC LC and ADPCM audio codec, and supports the creation of systems with high voice quality with a small amount of data. Target applications include various systems requiring voice navigation, such as home appliances, buildings and office equipment, a special tool. Enables users to edit voice navigation messages on the PC without having to enter the studio recording, making the voice navigation system easier to develop.

• W588Dxxx series chips enhance the sound quality of toy products

Voice coding chip with diversified functions

High-quality voice IC-W588Dxxx series chips can improve the sound quality of toy products. The W588Dxxx series uses a noise processor developed by Winbond and a high-resolution voice post-stage boosting amplifier circuit to achieve high-quality voice effects. This series has a built-in three-channel mixer that can play three-track voice output at the same time. It not only meets the various sound effects of the toy industry, but also achieves a lively auditory experience. In addition to the high-quality features, the W588Dxxx series covers 3 The memory capacity of 400 seconds of voice length can make the toy application field more extensive. At the same time, it also provides serial transmission interface management system (SIM), and SPI and other functions, can be easily matched with Winbond's serial Mask Rom products and SPI-Flash products, so that voice or program can be placed in external memory, and production is relatively reduced. Cost, suitable for a variety of card applications or extended storage capacity applications. In addition, the W588Dxxx series has a built-in 8-bit high-resolution PWM output that can be used to drive LEDs and motors for progressively brighter or micro-control effects.

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