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HT8658 Datasheet(PDF) 6 Page - Holtek Semiconductor Inc |
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HT8658 Datasheet(HTML) 6 Page - Holtek Semiconductor Inc |
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6 / 15 page  Recording capacity The HT8658/HT8659 offer 4 kinds of voice sam- pling rate, namely 32K, 22K, 16K and 11Kbps (based on a system frequency of 384KHz), se- lectable by the connection of the AS0 and AS1 pins. The voice sampling rate decides the re- cording capacity of the ICs in addition to the type and amount of DRAM. A higher sampling rate results in sounds of better quality but shortens the recording time. Sampling Rate DRAM Size (Maximum) Recording Time 32K bps 1Mb ×3 94 seconds 22K bps 1Mb ×3 136 seconds 16K bps 1Mb ×3 188 seconds 11K bps 1Mb ×3 272 seconds Recording Time Memory selection The HT8658/HT8659 provide a DRAM inter- face circuit. The type as well as amount of DRAM decides the recording length of the ICs at a designated sampling rate. There are 2 kinds of DRAM, namely 256Kb and 1Mb, select- able by the connection of the AS5 pin. The ICs can interface with a maximum of 4 DRAMs for the 256Kb type but 3 DRAMs for the 1Mb type. The amount of DRAMs is decided by the connec- tion of the AS2 and AS3 pins. AS5 AS3 AS2 Memory Size 11 1 256Kb ×1 11 0 256Kb ×2 10 1 256Kb ×3 10 0 256Kb ×4 01 1 1Mb ×1 01 0 1Mb ×2 00 1 1Mb ×3 00 0 1Mb ×3 Notes: 1. “0” connects an external pull-low resistor to ASn, where n=2,3, or 5. 2. “1” connects no external pull-low resistors to ASn, where n=2, 3 or 5. Record function The HT8658/HT8659 enter the recording state from the standby state when the memories are not full and the REC key is triggered as well. In the recording state, sounds input from an exter- nal microphone are coded by an internal ADM (adaptive delta modulation) algorithm and saved in an external memory until the memo- ries are all full or the REC key is retriggered. During recording, recording will pause and the recording counter stop counting by retriggering the REC key. At this time, if the memories are not full and the REC key is triggered again, the ICs will record sounds from the pause position. Once the memories are full, recording will be terminated and any retrigger to the REC key be ignored. After recording is stopped, the HT8658/HT8659 will play back the recorded sounds automat- ically in the AUTO PLAY mode. They, on the other hand, will play back the recorded sounds by manually triggering the PLAY key in the normal mode. Play function The HT8658/HT8659 provide 2 kinds of playing modes, namely normal mode and AUTO PLAY mode. In the normal mode, the ICs will play back the recorded sounds when recording is terminated and the PLAY key is triggered. In the AUTO PLAY mode, they will play back the recorded sounds automatically without manu- ally triggering the PLAY key once recording is terminated. In the process of playing sounds, triggering the PLAY key will pause the playing back in addition to the playing counter. To re- sume playing back, simply retrigger the PLAY key. Playing back will start at the pause posi- tion. HT8658/HT8659 6 26th Sep ’96 |
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