參數(shù)資料
型號(hào)： TDA9615H
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： Audio processor for VHS hi-fi(應(yīng)用于VHS高保真的音頻處理器)
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP44
封裝： 10 X 10 X 1.75 MM, PLASTIC, SOT-307-2, QFP-44
文件頁(yè)數(shù)： 30/44頁(yè)
文件大?。?/td> 263K
代理商： TDA9615H
1997 Jun 16
30
Philips Semiconductors
Preliminary specification
Audio processor for VHS hi-fi
TDA9615H
Automatic calibration;
see Fig.7
By means of bit CALS (power byte) the integrated
auto-calibration system is activated. By adjusting the
carrier frequencies, band-pass filters and noise reduction
filters auto-calibration ensures that the hi-fi processing
always is in accordance with the VHS hi-fi system
standard. Calibration is only needed after start-up of the
video recorder; as long as the supply voltage (pin 35) is
available calibration settings remain stable.
Auto-calibration is performed with the device in hi-fi
‘loop-through’ mode, no standby or test mode should be
active (auto-calibration demands bit settings AFM = 1,
STBP = 0, STBA = 0 and TEST = 0). After setting bit
CALS (power byte) to logic 1 auto-calibration is started.
Calibration is performed fully automatically, using the HID
input signal as a reference.
Calibration of the oscillator frequencies is performed by
measuring the number of oscillator cycles within one HID
HIGH period and comparing this with an internal value
stored in ROM. Four different ROM values are available for
NTSC or PAL (SECAM) system calibration of both the left
and right channel carrier.
In case of NTSC calibration a special routine is active for
the right channel carrier calibration resulting in a frequency
difference between the left and right channel carrier of
approximately 401.2 kHz. This value effectively reduces
the crosstalk from hi-fi carriers to the video colour signal as
present during ‘playback’ mode using Extended Play (EP)
tape speed.
NTSC calibration uses the standard 29.97 Hz (i.e.
16.683 ms) HID signal where PAL calibration uses the
standard 25 Hz (i.e. 20 ms) HID signal. The maximum
frequency error after auto-calibration is
±
5 kHz assuming
a HID HIGH-time error of maximum 5
μ
s. To realize NTSC
EP optimization within
±
2 kHz, HID jitter should not exceed
1
μ
s. In general the crystal based HID signal available in
the video recorder can be used without modification.
After calibration of the oscillators, the band-pass filters are
calibrated together with the integrated ‘weighting’ and
‘FM de-emphasis’ filter of the noise reduction. The total
auto-calibration time needed is 17 HID cycles or less.
End of calibration is signalled by bit CALR of the read byte.
The envelope output can also be used to monitor
calibration; for this purpose ENVOUT (pin 39) is forced
>2.5 V during calibration. The audio signal to the audio
envelope (level meter) function should be muted;
otherwise the audio envelope output may be >2.5 V as
well making it impossible to detect end of calibration via
the ENVOUT pin.
Fig.7 Example of automatic calibration flow.
handbook, full pagewidth
MGK477
logic 1
logic 0
logic 1
logic 0
4 V
3 V
5 V
calibration
ready
I
2
C-bus write
I
2
C-bus read
pin 39
(CALR)
(ENVOUT)
pin 40
(CALS)
(HID)
left channel oscillator
right channel oscillator
band-pass and
noise reduction filters
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