中英文资料-ISD25120录放音芯片介绍

ISD25120 录放音芯片介绍1 ISD 2500 系列芯片简介ISD 公司的 2500 系列芯片，按录放时间 60 秒、75 秒、90 秒和 120 秒分成 ISD2560、2575、2590 和 25120 四个型号。ISD 器件设有 OVF（溢出）端，便于多个器件级联。ISD2500 系列片内 EEPROM 容量都为 480K，最多能分 600 段。四个型号的不同录放时间是靠不同的输入采样率来实现的，它们分别为：8.0、6.4、5.3、4.0kHz。DIP 器件封装为 28 脚，各引脚功能如下：17 A0/M0A6/M6 地址/模式选择810 A7A9 输入地址线11 AUX IN 辅助输入12、13 VSSD、VSSA 数字地和模拟地14、15 SP+、SP-扬声器输出16 VCCA 模拟信号电源正极17、18 MIC、MIC REF 麦克风输入端和输入参考端19 AGC 自动增益控制20、21 ANA IN、ANA OUT 模拟信号输入和输出22 OUF 溢出23 CE 片选（低电平允许芯片工作）24 PD 芯片低功耗状态控制25 EOM 录放音结束信号输出26 XCLK 外部时钟27 P/R 录/放控制选择 28 VCCD 数字信号电源正极2 工作原理2500 系列有 10 个地址输入端 A0A9，录址能力可达 1024 位，地址空间为 01023。其分配情况是：地址 0299 作为分段用，地址 600767 未使用，地址 7681023 为工作模式选择（即 A8、A9 均为高）。2500 系列的地址线有两种用途，一是作为工作模式控制，二是作为分段录放音的起始段地址。当最高位地址（MSB）A8、 A9 都为高电平时（即地址 7681023），地址端 A0A6 就作为工作模式选择端 M0M6，对应 7 种工作模式。当 A8、A9 任一位为低或都为低时（即地址 0599），只要在分段录/ 放音操作前（不少于 300ns）给地址 A0A9 赋值，操作就从该地址开始。2500 系列语音芯片将 480K 的 EEPROM 分为 600 个信息段，每段 800 个字节。作为一个整体单位进行寻址和控制，应给每个信息段分配一个供外部控制的地址，而不是对每个字节进行寻址，否则至少需要 19 个地址端口。这样，大大减少了信息检索所需要的地址线。对较长的语音信号可以跨越多个信息段进行录音，不受内部存储信息段的限制，且内部的信息段址会自动增加。在每个语音段的尾部自动增加一个结束标志 EOM，组合放音时，通过检测 EOM 来控制各语音段的结束和下一段的开始。每个信息段的录放音时间等于总时间除以 600。如 ISD2560 的总时间为 60s，则每个信息段的录放音时间为 100ms；ISD25120 的总时间为 120s，则每个信息段的时间为 200ms。因此可以利用该时间长度作为一个段地址，通过单片机定时器的计时平行地映射信息段的地址，从而得到每段录音的起始地址。这样，就需要设置一个地址计数器。一般录音从 0 地址开始，首先通过 CPU 将它赋给 A0A9，然后通过单片机控制 ISD 启动录音，同时启动单片机的定时器开始计时，每到一个信息段的时间，就给地址计数加 1。当单片机停止控制 ISD录音时，同时停止定时器计时。此时地址计数器的值即为该段语音的未地址，加 1 即为下一段语音的首地址，并将它存在 EEPROM 中，为下一将放音提供的地址信息。通过 CPU 将该地址赋给 A0A9，即可录制下一段语音。依次下去，即可在录制完所有语音段的同时得到各段的起始地址。如果不是从 0 地址开始的语音段，只需将初始地址赋给 A0A9，加上地址计数器的值，即可得到语音段的末地址。这里不用同时保存各语音段的起始地址和结束地址，因为各个段是相邻的，前一段的末地址加 1 即是本段的起始地址，且每个语音段的结尾均有 EOM 标志，并可发出中断。放音时利用它和保存在 EEPROM 中各语音段的起始地址即可按任意顺序组合各个语音段。The introduce of sound playback chip ISD251201 ISD 2500 series chip Profile ISDs 2500 series chips, according to recording time 60 seconds, 75 seconds, 90 seconds and 120 seconds into ISD2560, 2575,2590 and 25120 four models. ISD device with OVF (overflow) client for cascading multiple devices. ISD2500 series EEPROM with capacity for 480K, up to sub-paragraph 600. Four different types of recording time depends on different input sampling rate to achieve, and they were: 8.0,6.4,5.3,4.0 kHz. DIP package 28-pin devices, the pin function as follows: 1 7 A0/M0 A6/M6 address / mode selection 8 10 A7 A9 enter an address line 11 AUX IN input 12,13 VSSD, VSSA and analog to digital 14,15 SP +, SP-speaker output 16 VCCA power analog signal positive 17,18 MIC, MIC REF Microphone input and the input reference terminal 19 AGC AGC 20,21 ANA IN, ANA OUT Analog signal input and output Spillage 22 OUF 23 CE chip select (low to allow the chip work) 24 PD-chip low-power state control 25 EOM an end audio playback signal output 26 XCLK external clock 27 P / R recorded / release control to choose 28 VCCD cathode power supply digital signal 2 Working Principle 2500 Series 10 input address A0 A9, the site recorded up to 1024, address space is 0 1023. Its distribution is: Address 0 299 as a sub, and did not address the use of 600 767, 768 1023 for the address mode selection (ie, A8, A9 are high). Address Line 2500 series has two purposes, first as a mode of control, the second sub-recording sound as the start segment address. When the highest address bit (MSB) A8, A9 are high (ie address 768 1023), the address A0 A6-side as a working model on the choice of client M0 M6, corresponding to seven kinds of work. When the A8, A9 or any one for the low low (that is, address 0 599), as long as recorded in the sub / playback pre-operation (less than 300ns) to the address A0 A9 assignment operation from the Address to start. 2500 series of voice chips will be divided into 480K of EEPROM information in paragraph 600, 800 bytes each. Unit as a whole, addressing and control information to each paragraph should be assigned an address for the external control rather than for each byte addressing, or at least address port 19. This greatly reduces the information needed to retrieve the address line. Of the speech signal can be a long cross-section of a number of information recording, storage information from the section of the internal constraints, and information within the site will automatically increase the segment. Each voice in the automatic increase in the tail section of an end mark EOM, when the combination of playing, by detecting EOM to control the end of the voice segment and the beginning of the next section. Information section of each audio playback time equal to the total time divided by 600. ISD2560, such as the total time for the 60s, the information section of each audio playback time of 100ms; ISD25120 the total time for the 120s, each time for paragraph information 200ms. Therefore the length of time can be used as a segment address, through the time-parallel single-chip timer to the address above mapping information in order to get the start address of each recording. In this way, on the need to set up an address counter. General address from 0 to start recording, first of all, through the CPU assigned to it A0 A9, then start recording ISD SCM, SCM to start the timer at the same time the beginning of time, every time an information paragraph, give the address count plus 1. ISD single-chip control when to stop recording at the same time stop the timer time. At this point the value of address counter is the voice of the paragraph did not address, plus 1 under the section of speech is the first address, and EEPROM in its existence, will be playing for the next address information provided. Through the CPU assigned to the address A0 A9, under the section of your voice recording. Followed it, you can record voice above all at the same time be the starting address of the paragraphs. If it is not started from 0 voice above address, simply assign the initial address A0 A9, with the value of address counter can be a voice at the end of the address above. Not here at the same time to preserve the voice segment start address and end address, because it is adjacent to each paragraph, before paragraph 1 at the end of the address that is the starting address of this paragraph, and each have a voice at the end of paragraph mark EOM may give a disruption. Use it when playing and stored in the EEPROM in the initial paragraph of the speech address in any order combination of voice above all.ISD25120 录放音芯片介绍1 ISD 2500 系列芯片简介ISD 公司的 2500 系列芯片，按录放时间 60 秒、75 秒、90 秒和 120 秒分成 ISD2560、2575、2590 和 25120 四个型号。ISD 器件设有 OVF（溢出）端，便于多个器件级联。ISD2500 系列片内 EEPROM 容量都为 480K，最多能分 600 段。四个型号的不同录放时间是靠不同的输入采样率来实现的，它们分别为：8.0、6.4、5.3、4.0kHz。DIP 器件封装为 28 脚，各引脚功能如下：17 A0/M0A6/M6 地址/模式选择810 A7A9 输入地址线11 AUX IN 辅助输入12、13 VSSD、VSSA 数字地和模拟地14、15 SP+、SP-扬声器输出16 VCCA 模拟信号电源正极17、18 MIC、MIC REF 麦克风输入端和输入参考端19 AGC 自动增益控制20、21 ANA IN、ANA OUT 模拟信号输入和输出22 OUF 溢出23 CE 片选（低电平允许芯片工作）24 PD 芯片低功耗状态控制25 EOM 录放音结束信号输出26 XCLK 外部时钟27 P/R 录/放控制选择 28 VCCD 数字信号电源正极2 工作原理2500 系列有 10 个地址输入端 A0A9，录址能力可达 1024 位，地址空间为 01023。其分配情况是：地址 0299 作为分段用，地址 600767 未使用，地址 7681023 为工作模式选择（即 A8、A9 均为高）。2500 系列的地址线有两种用途，一是作为工作模式控制，二是作为分段录放音的起始段地址。当最高位地址（MSB）A8、 A9 都为高电平时（即地址 7681023），地址端 A0A6 就作为工作模式选择端 M0M6，对应 7 种工作模式。当 A8、A9 任一位为低或都为低时（即地址 0599），只要在分段录/ 放音操作前（不少于 300ns）给地址 A0A9 赋值，操作就从该地址开始。2500 系列语音芯片将 480K 的 EEPROM 分