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AKM AKD7756-HF User Manual

Hands free evaluation
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AKD7756-HF is a Hands-free evaluation kit for the AK7756 which is an audio processor with PCM
interface, EEPROM interface, mono voice audio CODEC and microphone pre-amplifier. A speaker
amplifier is integrated in this evaluation kit for easy evaluation of Hands-free function by connecting
external microphones and speaker units. It is possible to access to the AKD7756-HF via USB interface,
and adjustment of voice quality and noise attenuation level can be made with Windows GUI applications.
An external Flash Memory for DSP programming is integrated into this kit enabling a stand-alone
operation. In addition, an easy connection to a mobile phone is provided by integrated Blue Tooth module
for evaluations.
■
Ordering guide
AKD7756-HF
•
AK7756 Hands Free System (HFS) Box
•
USB Control Adapter
•
Monitoring Board
•
AD-DC Converter for main power supply
•
Control Soft
Write/Read access to PRAM, CRAM, OFREG and control registers of AK7756
In/Output Ports: MIC-IN/SPK-OUT/S-AMPOUT/TEL-IN/TEL-OUT
Flash Memory (EEPROM) for parameter storage and stand-alone operation
Blue-Tooth transceiver
Wired
<KM101400>
AK7756 Hands Free Evaluation Rev.0
GENERAL DESCRIPTION
FUNCTION
AKD7756-HFS
Wireless
BT-Transceiver
AK
2300
Xilinx
EEPRO
Control Box
PC
- 1 -
AKD7756-HF
AK
7756
AK7835
Monitor Board
[AKD7756-HF]
2010/06

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Summary of Contents for AKM AKD7756-HF

  • Page 1 AK7756 Hands Free Evaluation Rev.0 GENERAL DESCRIPTION AKD7756-HF is a Hands-free evaluation kit for the AK7756 which is an audio processor with PCM interface, EEPROM interface, mono voice audio CODEC and microphone pre-amplifier. A speaker amplifier is integrated in this evaluation kit for easy evaluation of Hands-free function by connecting external microphones and speaker units.

  • Page 2: Board Diagram

    [AKD7756-HF] BOARD DIAGRAM ■ Front Panel (4) (5) ■ Rear Panel (10) (11) (12) (13) ■ Main Board (14) (15) (16) <KM101400> 2010/06 - 2 -...
  • Page 3 (push switch) AK7756 IRSTN pin control (PUSH: RESET). With Control box: Disabled When controlling the AKD7756-HF by a PC, this reset switch is not valid and a reset should be made by control soft. STATUS RED: It shows a status of the AK7756’s STO pin. (Light: “H”, Off: “L”) (LED) BLUE: It shows a Bluetooth status.
  • Page 4 [AKD7756-HF] I/O ports of the AK7756 are used when an external Bluetooth module is in master mode. Pin# Name Function BT-SDI AK7756-SDOUT1 Output BT-SDO AK7756-SDIN1 Input BT-LRCK AK7756 LRCK Input BT-BICK AK7756 BICK Input Ground Table 1. Main Board Functions (Bold: Default Setting) ■...
  • Page 5 • Power on the AKD7756-HF. • Push and hold the HOOK button on front panel of the AKD7756-HF for more than seven seconds. When releasing the button, LED of the status2 is ON and the AKD7756-HF becomes Bluetooth pairing wait state.
  • Page 6 Evaluation Board and Control Software Set-up 1) Connect the AKD7756-HF to the USB control box. 2) Connect the AC-DC adaptor to the +12V port of the AKD7756-HF. 3) Connect the USB control box to a PC with USB cable. The USB control box is recognized as HID (Human Interface Device) on the PC. When it can not be recognized correctly (e.g., recognized as an unknown device), please push the reset button (yellow) of the USB control box.
  • Page 7 Coefficient RAM CRAM Setting parameters used on the HF program Table 2. AK7756 Code Area (Note 1) Setting programs can be provided by AKM on request. The setting can be made by SCRIPT writing mode of the GUI. Write CONT Example: File Name: set_RegScript.txt...
  • Page 8 [AKD7756-HF] ■ Parametric Equalizers The parametric equalizers as follows are included in HF code. Name Function CRAM Address Receiving-PEQ Filter for receiving sound 1st Band:(1C4h) ~ (1C8h) 4-band IIR 2nd Band:(1C9h) ~ (1CDh) 3rd Band:(1CEh) ~ (1D2h) 4th Band:(1D3h) ~ (1D7h)
  • Page 9 [AKD7756-HF] 8 bands adjustments can be made in RUN state by GUI. Figure 5. Control S/W [PEQ] tab screen (1) Select [PEQ] tab to open Equalizer dialogue. (2) Push down the [USE] button to write this operation setting to the DSP.
  • Page 10 [AKD7756-HF] ■ Noise Canceller The noise canceller sets optional noise attenuation for 6 divided voice bands. This noise cancel adjustment is made with the real time NC parameter adjustment function of GUI software as shown the following diagram. Sensitivity Adjustment...
  • Page 11 [AKD7756-HF] With GUI, it is possible to make adjustment of 8 CRAM parameters simultaneously in RUN state. Figure 8. Control S/W [Mon/Slider] tab screen (1) Select [Mon/Slider] tab. (2) Push down the [USE] button to write this operation setting to the DSP.

  • Page 12: Revision History

    AKM harmless from any and all claims arising from the use of said product in the absence of such notification.
  • Page 13 BT-SDI BlueT-SDI BT-RESET FRONT-BT-RST BT-HOOK FRONT-HOOK BT-LED FRONT-BT-LED DSP-RESET BT-CONECT XCONTROL Title Title Title AKD7756-HF Size Size Size Document Number Document Number Document Number Date: Date: Date: Thursday, November 19, 2009 Thursday, November 19, 2009 Thursday, November 19, 2009 Sheet...
  • Page 14 BICK SDIN1 SDIN1 IRSTN IRSTN 100k 100k 100k 100k AK7756-30pin-VSOP AK7756-30pin-VSOP Title Title Title AKD7756-HF Size Size Size Document Number Document Number Document Number AK7756 Date: Date: Date: Friday, October 30, 2009 Friday, October 30, 2009 Friday, October 30, 2009...
  • Page 15 MR-552LS(W) MR-552LS(R) MR-552LS(R) NJM2119 NJM2119 AMP-BIAS1 5.1k 5.1k memo:Ux-A 100pF 100pF Title Title Title AKD7756-HF Size Size Size Document Number Document Number Document Number ANALOG Date: Date: Date: Thursday, November 19, 2009 Thursday, November 19, 2009 Thursday, November 19, 2009...
  • Page 16 BT-BICK BT-SDO BT-LRCK BT-SDI BT-LED BT-HOOK BT-LED HEADER 20x2/M HEADER 20x2/M BT-HOOK Title Title Title AKD7756-HF Size Size Size Document Number Document Number Document Number BT-CONECT Date: Date: Date: Thursday, November 19, 2009 Thursday, November 19, 2009 Thursday, November 19, 2009...
  • Page 17 2300-SDO 0.056uF(+-30%) 0.056uF(+-30%) 0.1uF 0.1uF AVDD AVDD 0.1uF 0.1uF 0.1uF 0.1uF Title Title Title AKD7756-HF Size Size Size Document Number Document Number Document Number CODEC Date: Date: Date: Friday, October 30, 2009 Friday, October 30, 2009 Friday, October 30, 2009...
  • Page 18 DVDD 0.1uF 0.1uF EEP-WE EEP-SCL EEP-SDA M24256-Bx M24256-Bx Title Title Title AKD7756-HF Size Size Size Document Number Document Number Document Number EEPROM Date: Date: Date: Friday, October 30, 2009 Friday, October 30, 2009 Friday, October 30, 2009 Sheet Sheet Sheet...
  • Page 19 MIC POWER 10uF/16V(A) 10uF/16V(A) 0.1uF 0.1uF 0.1uF 0.1uF 10uF(T) 10uF(T) 10uH(500mA) 10uH(500mA) Title Title Title AKD7756-HF Size Size Size Document Number Document Number Document Number POWER Date: Date: Date: Thursday, November 19, 2009 Thursday, November 19, 2009 Thursday, November 19, 2009...
  • Page 20 VCC+12V VDD+5V LM1084IS-5.0 LM1084IS-5.0 REG6 REG6 10uH(500mA) 10uH(500mA) 7835INN 10uF/16V(A) 10uF/16V(A) 0.1uF 0.1uF 0.1uF 0.1uF 10uF(T) 10uF(T) SPK-GND S-AMPOUT VDD+5V 10uF(T) 10uF(T) 0.1uF 0.1uF VDD1 RCA5 RCA5 0.1uF 0.1uF MR-552LS(W) MR-552LS(W) VDD2 VSS1 10uF(T) 10uF(T) 0.1uF 0.1uF VSS2 7835PDN 7835PDN AK7835 AK7835 SPK-GND...
  • Page 21 0.1uF 0.1uF 0.1uF 0.1uF VDD+3V 10uF(T) 10uF(T) 0.1uF 0.1uF 0.1uF 0.1uF Title Title Title AKD7756-HF Size Size Size Document Number Document Number Document Number XCONTROL Date: Date: Date: Thursday, November 19, 2009 Thursday, November 19, 2009 Thursday, November 19, 2009...