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參數(shù)資料
| 型號： | TDA6612-2X |
| 廠商： | SIEMENS A G |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO28 |
| 文件頁數(shù)： | 23/47頁 |
| 文件大?。?/td> | 1967K |
| 代理商： | TDA6612-2X |
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Semiconductor Group
3
TDA 6612-2
Circuit Description
Signal Section
The audio signal processing in the matrix and the switch-over for multi channel TV-sound signals
according to the two carrier system used in Germany takes place in the matrix and switching sec-
tions. Crosstalk compensation is carried out in the sound 1 input stage. The crosstalk compensation
range has an adjustment range of
± 3 dB with a step width of 0.2 dB. In addition to the two inputs
for the demodulated sound carrier a two channel SCART-input and an additional mono input (e.g.
for demodulated L-standard sound) are provided. The two AF (pin 1 and pin 2) inputs can be by-
passed internally in such a way that decoded stereo sound of other audio systems (NICAM) can be
processed. The switching section includes also the SCART-output with the possibility to select the
sound 1 or 2 during the "dual" mode. The Ch1/Ch2-switches for the loudspeaker and headphone
outputs are independently switchable.
In the signal path for the volume control unit output there is the Ch1/Ch2-switch followed by two dif-
ferent volume control units. The first has a control range from 0 to – 15 dB with a step width of 1.25
dB. In conjunction with the main volume control after bass and treble control a high immunity against
overdriving the output stage is reached. The first volume control is used as a "pre-stage" of the main
volume control in conjuntion with the clipping detector. This section is followed by a switchable quasi
stereo stage which provides a stereophonic audio effect with mono signals due to a 180 phase shift
at medium frequencies (about 1 kHz) in one channel. The following bass control has a control range
of +15/–12 dB with a step width of 3 dB. The cut-off frequency for each channel is set with an ex-
ternal capacitor. The implemented switchable circuit for stereo base width expansion provides a
three dimensional aural reception. This is realized with a 50% frequency dependent crosstalk with
opposite phase of the signal between both channels. The circuit operates with the same cut-off fre-
quency as the bass control, but the function is widely independent. The treble control has a step
width of 3 dB with an control range of +/–12 dB. The cut-off frequency of the treble control is derived
from one capacitor for each channel. The loudspeaker signal path is terminated with the loudspea-
ker control, independently adjustable for left and right. With 57 steps of 1.25 dB the adjustment ran-
ge is 70 dB, where step 57 activates the "MUTE" function. Functions such as "balance" or "loud-
ness" are realized by software and adjustment of the appropriate tone and volume controls. In the
volume control unit there is a clipping detector. The status of the clipping detector can be evaluated
via the I2C Bus. Therefore it is possible to implement an automatic volume control using the clipping
detector and software implemented into the controller.
After every evaluation the clipping bit is reset. Therefore after a read access to the clipping bit a new
evaluation of the clipping detector status is possible.
The signal path for the headphones contains a volume control after the Ch1/Ch2-switch with a com-
mon adjustment for left and right. Thirty two steps of 2 dB give an adjustment range of 62 dB (31 x
2 dB = 62 dB, the 32nd step is MUTE).
Identification Signal Decoder
The input of the identification signal decoder consists of an op-amp for the pilot signal with its side
bands. An external LC-circuit is used. The signal is then passed to a phase independent active
band-pass filter with a very narrow bandwidth (adjustable externally). This filter detects whether the
lower side band of the pilot carrier, which is modulated with the identification signal, is present. The
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