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HT98R068-1 Arkusz danych(PDF) 77 Page - Holtek Semiconductor Inc

Numer części HT98R068-1
Szczegółowy opis  Two Way Radio 8-Bit MCU
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Producent  HOLTEK [Holtek Semiconductor Inc]
Strona internetowa  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

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HT98R068-1
Two Way Radio 8-Bit MCU
HT98R068-1
Two Way Radio 8-Bit MCU
Transmitter Compressor
The device incorporates an optional syllabic compandor for both the transmit and receive mode.
This compresses the audio band signals before transmission to enhance the overall dynamic range.
The relationship between the input and output voltage of the compandor is shown in the following
figure.
Compander voltage-voltage response
Transmitter Sub-audio Encoders
Sub-audio signaling is available in the audio band below 260Hz. When sub-audio signaling is
enabled, the 300Hz HPF in the audio section should also be enabled to remove the sub-audio
signaling from the actual audio signals (for both Tx and Rx). Both CTCSS tones and DCS codes
are supported. Except for the 51 defined CTCSS tones, users can define their specified tones using
registers. The DCS coder/decoder includes a 23-bit mode with both normal and inverse modulation
formats and a 134Hz end of transmission burst.
Transmitter In-Band Signaling
The device includes a programmable in-band tone set or an arbitrary single user-tone between
300Hz and 3000Hz. By default, the device will use an EEA selective call defined tone set; however
this may be changed to any valid tone within its operational range using registers. As well as the
selective call defined tone sets, standard dual tone multiple frequency, DTMF, is also supported in
the in-band signaling mode.
Supported Different Combination Functions
For optimal power consumption, the audio processor can be set to operate with different operation
frequencies for different functional requirements. The accompanying table provides a reference for
the required audio processor system clock for different applications.


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