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TDA9875 Datasheet(PDF) 11 Page - NXP Semiconductors |
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TDA9875 Datasheet(HTML) 11 Page - NXP Semiconductors |
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11 / 92 page  1998 Feb 13 11 Philips Semiconductors Preliminary specification Digital TV Sound Processor (DTVSP) TDA9875 6.1.8 NICAM AUTO-MUTE This function is enabled by setting bit AMUTE LOW subaddress 14 (see Section 10.3.11). Upper and lower error limits may be defined by writing appropriate values to two registers in the I2C-bus section (subaddresses 16 and 17; see Sections 10.3.13 and 10.3.14). When the number of errors in a 128 ms period exceeds the upper error limit the auto-mute function will switch the output sound from NICAM to whatever sound is on the first sound carrier (FM or AM). When the error count is smaller than the lower error limit the NICAM sound is restored. The auto-mute function can be disabled by setting bit AMUTE HIGH. In this condition clicks become audible when the error count increases; the user will hear a signal of degrading quality. A decision to enable/disable the auto-muting is taken by the microcontroller based on an interpretation of the application control bits C1, C2, C3 and C4 and, possibly, any additional strategy implemented by the set maker in the microcontroller software. When the AM sound in NICAM L systems is demodulated in the 1st sound IF and the audio signal connected to the mono input of the TDA9875, the controlling microcontroller must implement the switching from NICAM reception to mono input, if auto-muting is desired. 6.1.9 CRYSTAL OSCILLATOR A circuit diagram of the external components of the voltage-controlled crystal oscillator is illustrated in Fig.8 (see Chapter 12). 6.1.10 TEST PINS Both test pins are active HIGH, in normal operation of the device they are wired to VSSD1. Test functions are for manufacturing tests only and are not available to customers. Without external circuitry these pads are pulled down to LOW level with internal resistors. |
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