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HT817D0 Datasheet(PDF) 6 Page - Holtek Semiconductor Inc |
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HT817D0 Datasheet(HTML) 6 Page - Holtek Semiconductor Inc |
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6 / 15 page  HT817D0 6 March 15, 2000 The oscillator is turned on when triggered by a key input. After playing, it is immediately turned off and the chip goes into the standby state. Voice ROM The voice ROM is originally designed to continu- ously record the 16.8-second voice data at a 6kHz sampling rate. A higher sampling rate can gener- ate voices of better playback quality, but will shorten the total recording time. On the other hand, a lower sampling rate results in longer re- cording time but sacrifice voice quality. The playback time can be significantly extended by making use of coding efficiency, silence play- ing, section repeating, section cascade, etc. Section Section is the basic element constituting the contents of voice ROM. During programming, the customer¢s voice sources can be divided into as many sections as required. A section can be composed of a voice or an interval of silence. However, the silence length is not counted in voice ROM. The total number of sections in- cluded should be less than 508 due to the space limitation of the function table ROM. The total length of the included sections is limited by voice ROM. A section, when triggered by a key input, can be played once, repeatedly or cascaded with other sections, depending on the key function table instructions. The following are examples of section division: In addition, a section can be set as retriggerable or non-retriggerable depending on the code op- tion. · Retriggerable When the currently playing section is set as retriggerable, it will stop immediately upon receipt of other key inputs. · Non-retriggerable When the currently playing section is selected as non-retriggerable, it will go on playing till the whole section is completed, whether or not there is a key input in the process of playing. Of a key group, some sections can be set as retriggerable and some as non-retriggerable. When a retriggerable section of a key group is playing, any key can be triggered to interrupt its playing. On the other hand, if it is a non-retriggerable section playing, any key in- terrupt is ignored. Group The HT817D0 plays groups on the basis of the key input. A group can be made up of one or more sections. When a key is triggered, the cor- responding group is played immediately. For example, triggering KEY2 plays group 2, and so on. The same section is allowed to appear in dif- ferent groups. However, KEY1 can be made up of multiple groups when it is optioned as a se- quential or random key. Otherwise, each key is comprised by one group only. Key function table The sections include in the voice ROM are played according to the instructions of the key function table. The function table contains group information as well as playing order of sections in the groups. Notice that the total number of sections included in the groups should be less than 508, the space limitation of the function table ROM. se c. 2 s e c . N se c. 1 se c. 1 s e c . 2 se c. 3 se c. 1 RO M RO M RO M E x am pl e 1: O ne s e c t i o n o n l y E x am pl e 2: 3 s ec t i on di v i s i on E x am pl e 3: N s ec t i on d i v i s i o n |
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