Tokyo, Japan Asahi Kasei Microdevices Corporation (AKM) launched the AK7782, a dual audio DSP, integrated with two independent 24-bit 96kHz stereo ADCs with an eight-channel input selector, a mono ADC, and two independent 96kHz two-channel sample rate converters (SRC). It is ideal for car audio applications such as rear-seat entertainment systems. The eight-channel stereo selector and a SRC provide switching between analog or digital multi-source inputs. The SRC allows the DSP to operate in master mode only, eliminating complicated switching procedures between master and slave mode.
The DSP operation capability is 2560 steps, sampling at 48kHz. 6k-words of delay memory are available for surround-sound effects and time alignment. In addition, the RAM program area is freely programmable for user applications. For Dolby or SRS licensed users, programs such as Dolby DAEP or CS2 Auto has already been ported. Users can create their own applications by combining those standard programs with the original algorithm.
Because the two sets of stereo ADCs can receive different audio signals respectively, different music sources can be selected for the front seat or rear seat position. The AK7782 also has a mono ADC with a volume control that can operate independently when the DSP operation is stopped. This allows for voice input interrupts by mixing the voice signal from a car navigation system and mobile phone into the main audio signal of the AK7782. The AK7782 has a serial audio interface with seven input and seven output ports for interfacing to other audio devices. The supported audio formats are MSB justified, LSB justified and I2S, making the AK7782 ideal for car entertainment centers with high-performance multi-channel speakers. The AK7782 is housed in a 100-pin LQFP package.