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HT81003 Datasheet(PDF) 4 Page - Holtek Semiconductor Inc |
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HT81003 Datasheet(HTML) 4 Page - Holtek Semiconductor Inc |
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4 / 8 page  HT81003 Rev. 1.10 4 January 22, 2002 Functional Description The EasyVoice TM is voice synthesizer with 3-second voice capacity. A group of pre-recorded voice sections is played upon receipt of key trigger input signals. Two FLAG signals are output while playing voices. The 3-sec voice capacity can be divided into sections of arbitrary length. Notice that the silence length and end-pulse width are not included in the memory. By using Holtek ¢s programming tools, the contents and arrangement of sections, as well as key features and FLAG output are all programmable before device fabri- cation. The IC provides 2 key inputs (KEY1~KEY2), KEY1 can be optioned as a direct, sequential trigger key. Key 2 can be selected as a stop or a direct key. Play function block diagram System oscillator The EasyVoice TM has a built-in RC oscillator which re- quires only one external resistor for normal applications. The oscillator frequency is typically 2MHz for an exter- nal resistor of 150k W. The required oscillator frequency may vary with different sampling rates in the process of voice programming. As a result, the value of the oscilla- tor resistor may be different with respect to different items. The oscillator is turned on when triggered by a key input. After playing, it is immediately turned off. Then the chip goes into the standby state. Voice ROM The voice ROM is originally designed to continuously re- cord the 3-sec voice data at about 5kHz sampling rate. A higher sampling rate will generate voices of better playback quality, but will shorten the total recording time. On the other hand, a lower sampling rate will result in longer recording time but sacrifice the voice quality. The playback time can be significantly extended by making use of coding efficiency, silence playing, section repeating, section cascade, etc. Section Section is the basic element constituting the contents of the 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 in- terval of silence. However, the silent length is not counted in the voice ROM. The total number of sections included should be less than 256 due to the space limi- tation of the function table ROM. The total length of the included sections is limited by the voice ROM. A section, when triggered by a key input, can be played once, repeatedly or cascaded with other sections, de- pending 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 code option. · 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 until the whole section is completed, whether or not there is a key in- put in the process of playing. For 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. If it is a non-retriggerable section playing, any key interrupt is invalid. Group The EasyVoice TM plays groups according to the key in- put. A group can be made up of one or more sections. When a key is triggered, the corresponding group is played. 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 multi- ple groups when it is optioned as a sequential key. Otherwise, each key is composed by one group only. K e y t r i g g e r K e y f e a t u r e s o p t i o n K e y f u n c t i o n t a b l e R O M V o i c e R O M S e l e c t P l a y c o n t r o l l o g i c . l a g o u t p u t V D D 8 W s p e a k e r P W M + P W M - 8 / 1 6 / 3 2 W s p e a k e r T R H T 8 1 0 0 3 O S C I R O S C s e c . 2 s e c . N s e c . 1 s e c . 1 s e c . 2 s e c . 3 s e c . 1 R O M E x a m p l e 1 : O n e s e c t i o n o n l y E x a m p l e 2 : 3 s e c t i o n d i v i s i o n E x a m p l e 3 : N s e c t i o n d i v i s i o n R O M R O M |
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