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参数资料
| 型号： | D1723GF |
| 厂商： | NEC Corp. |
| 英文描述： | PLL FREQUENCY SYNTHESIZER AND CONTROLLER FOR FM/MW/LF TUNER CAR AUDIO |
| 中文描述： | 锁相环频率合成器和控制器的调频/中波/低频调谐器汽车音响 |
| 文件页数： | 41/80页 |
| 文件大小： | 1590K |
| 代理商： | D1723GF |
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41
μ
PD1723GF-013,
μ
PD1723GF-213
Function
Symbol
Auto tuning (scan operation) key.
The frequencies are searched up (
key) or down (
key) in 1
channel steps and whether or not there is a broadcast station (IF count and SD signal) is
detected at each receiving frequency and when a broadcast station is judged to be present, that
frequency is held for 5 seconds. On the VF band, whether or not there is an SK signal is de-
tected as well as seek operation. If no operation is performed during this 5 seconds, the seek
operation is repeated and the next broadcast station is received sequentially every 5 seconds
(scan operation).
During this 5 seconds hold, the frequency display flashes at 1 Hz (duty 50 %).
At the end of the 5 seconds hold, BEEP is output.
Seek operations (channel up/down method, AUTOSTP switch and IF count, SD detection, SK
signal detection) are the same as the
and
keys. When the radio is
turned off (including mode switching) and then turned on, the frequency held last (when there
is not even 1 broadcast station, the frequency when the scan operation started) is received.
The operation of each key during seek operation (other than at 5 seconds hold) is shown below.
SEEK UP
SEEK DWN
Key
Operation
SCAN UP
SCAN DWN
SCAN DWN
SCAN UP
SCAN UP
SCAN DWN
SEEK UP
SEEK DWN
MAN UP
MAN DWN
key during scan up and
key during scan down
Scanning stops and returns to the frequency held last.
However, when the auto local function is used, the local mode is switched.
key during scan up and
key during scan down
Operation shifts to operation of the pressed key from the frequency when the key
was pressed.
Key transfer operation is also enabled.
Scanning stops and seek operation starts from the frequency when the key was
pressed.
Scanning stops and returns to the frequency held last (when a frequency was not
held, returns to the frequency when scanning started).
Scanning stops the moment the key is pressed even when the AUTO500 switch is
1 (when the
or
key is pressed for more than 0.5
seconds, seek is performed).
Scanning stops and the band is switched sequentially as shown below.
→
FM1
→
FM2
→
FM3
→
MW1
→
MW2
→
LW
However, bands disabled by receiving area and DISFM3, ENMW2, and DISLW
switches are skipped.
When switching returns to the same band, the frequency held last is received. When
a frequency was not held, the frequency when scanning started is received.
MAN UP
MAN DWN
SCAN UP
SCAN DWN
BAND
SCAN UP
SCAN DWN
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