Nippon Wireless has developed the DSP NJU26060V for audio equipment and is available now. The product has a built-in PWM*1 modulator, which is ideal for signal processing in speaker systems such as SOUNDBAR and ultra-thin TVs.
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[development background]
With the diversification of models such as SOUNDBAR and ultra-thin TVs, the cycle of retrofit design will become shorter and shorter. Moreover, with the increase of additional functions and the requirements for the differences in functions of various models, the necessary sound processing has become different, and most of the models have to be customized, which increases the difficulty of design.
In order to reduce the difficulty of design, Nippon Wireless has developed the DSP NJU26060V for audio equipment with a built-in PWM modulator. The product is characterized by the customer's choice of firmware (sound effect technology), and can be designed in three ways.
ã€product features】
The NJU26060V is a 24-bit fixed point DSP for audio equipment. It consists of a 3-input 1-output selector, a sample rate converter, a 24-bit DSP core, a PWM modulator, an OTP*2 memory, and a digital interface transmitter.
In addition, the NJU26060V is combined with the newly developed A/D converter NJU3610 for audio, which can easily correspond to analog sound input.
Feature 1 Equipped with OTP memory, OTP memory can be equipped with a small amount of production according to customer requirements. According to the choice of firmware (audio effect technology), customers can define the necessary signal processing functions such as surround sound for each model, and can also produce a small amount of production. .
Nippon Wireless is now offering a variety of licensed sound effects technology represented by the original sound effects technology "eala" in the form of firmware.
Feature 2 Single-chip output for three output formats can be selected from the PWM output (stereo 2 system), DIT*3 output (1 system), and I2S*4 output (stereo 3 system) that are most suitable for driving speakers. Since three output forms are available, there is no need to re-select parts and redesigns when the model is replaced, which reduces the difficulty of design.
Feature 3 does not have to consider the difference in sampling frequency when designing
The NJU26060V is equipped with a sample rate converter that can match the sampling frequency from fs=8k to 192kHz. Since the digital audio signals of different sampling frequencies are processed synchronously by the built-in sample rate converter (converted to 48 kHz), the difference in sampling frequency is not considered at all in design.
In addition, the selector with three inputs and one output is equipped to make the selection of the sound source easy.
ã€application】
・Speaker system (SOUNDBAR, etc.), ultra-thin TV [product performance]
・ 24-bit fixed decimal point digital signal processor ・PWM modulator: Stereo 4ch. Output/Sampling Rate Converter (SRC): fs=8kHz to 192kHz → 48kHz
・ Digital Interface Transmitter (DIT)
・ Digital audio interface: Input 3 port, output 3 port ・ Digital audio format: I2S 24bit, which can be matched to the left and right, BCK: 32/64fs
・ Host interface: I2C bus interface (Fast-mode/ 400kbps)
・ Power supply voltage : 3.3V
・ Input terminal allowable voltage: 5V allowable value ・ Package: SSOP44 (11.0×7.6×1.25mm typ.) [Lead-free
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