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データシートサーチシステム |
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データシートサーチシステム |
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MSP34X1G データシート(PDF) 98 Page - Micronas |
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MSP34X1G データシート(HTML) 98 Page - Micronas |
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98 / 104 page  MSP 34x1G PRELIMINARY DATA SHEET 98 Micronas 6.5.5. NICAM Deemphasis A J17 Deemphasis is always applied to the NICAM signal. It is not switchable. 6.5.6. Identification Mode for A2 Stereo Systems To shorten the response time of the identification algo- rithm after a program change between two FM-Stereo capable programs, the reset of the ident-filter can be applied. Sequence: 1. Program change 2. Reset ident-filter 3. Set identification mode back to standard B/G or M 4. Wait approx. 500 ms 5. Read stereo detection register Note: This register is initialized during STANDARD SELECTION and is automatically updated when Auto- matic Sound Select (MODUS[0]=1) is on. 6.5.7. FM DC Notch The DC compensation filter (FM DC Notch) for FM input can be switched off. This is used to speed up the automatic search function (see Section 6.4.7.). In nor- mal FM-mode, the FM DC Notch should be switched on. 6.6. Manual/Compatibility Mode: Description of DSP Read Registers All readable registers are 16-bit wide. Transmissions via I2C bus have to take place in 16-bit words. Some of the defined 16-bit words are divided into low and high byte, thus holding two different control entities. These registers are not writable. 6.6.1. Stereo Detection Register for A2 Stereo Systems Note: It is no longer necessary to read out and evalu- ate the A2 identification level. All evaluation is per- formed in the MSP and indicated in the STATUS regis- ter. 6.6.2. DC Level Register The DC level register measures the DC component of the incoming FM signals (FM1 and FM2). This can be used for seek functions in satellite receivers and for IF FM frequencies fine tuning. A too low demodulation frequency (DCO) results in a positive DC-level and vice versa. For further processing, the DC content of the demodulated FM signals is suppressed. The time constant τ, defining the transition time of the DC Level Register, is approximately 28 ms. Identification Mode 00 15hex L Standard B/G (German Stereo) 0000 0000 00hex RESET Standard M (Korean Stereo) 0000 0001 01hex Reset of Ident-Filter 0011 1111 3Fhex FM DC Notch 00 17hex L ON 0000 0000 00hex Reset OFF 0011 1111 3Fhex Stereo Detection Register 00 18hex H Stereo Mode Reading (two’s complement) MONO near zero STEREO positive value (ideal reception: 7Fhex) BILINGUAL negative value (ideal reception: 80hex) DC Level Readout FM1 (MSP-Ch2) 00 1Bhex H +L DC Level Readout FM2 (MSP-Ch1) 00 1Chex H +L DC Level [8000hex ... 7FFFhex] values are 16 bit two’s complement |
同様の部品番号 - MSP34X1G |
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同様の説明 - MSP34X1G |
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