KR920004338Y1 - Circuit for detecting and controlling two carrier voice identification signal - Google Patents

Abstract

No content.

Description

Voice Multiple ID Signal Detection and Control Circuit

1 is a peripheral configuration diagram of a voice multiple ID signal detection and control circuit of the present invention.

2 is a circuit diagram showing an embodiment of the present invention

3a, b or hysteresis characteristics according to the present invention

* Explanation of symbols for main parts of the drawings

4: first low band filter 5: second low band filter

6 ID signal detection and control circuit 11 comparison unit

12: output control unit 13: the first current source

14 second current source 15 first current mirror

16: second current mirror

The present invention relates to a voice multiple ID signal detection and control circuit, and in particular, to have a hysteresis characteristic for input sensitivity in a voice multiple ID signal detection system and to increase the input voltage of a comparator so as to have a strong system such as external noise. .

In general, the configuration of controlling the voice multiple signal control unit and the matrix unit by detecting the ID signal is performed as in the first diagram.

That is, an ID signal detection circuit 1 for detecting the modulated ID signal S and a first PLL (phase-L) for detecting a stereo ID signal and a dual voice ID signal from the pilot signal of the ID signal detection circuit 1, respectively. a first low band filter 4 and a second low band filter for filtering output signals of the lodked loop circuit 2 and the second PLL circuit 3, and the first and second PLL circuits 2 and 3. 5) and the output of the first and second low band filters 4 and 5, and detect an ID signal, and perform an audio multiple signal control unit and a matrix unit 7 operating according to a stereo, dual audio signal, and mono. And an ID signal detection and control circuit 6 for controlling the control.

The present invention relates to the ID signal detection and control circuit (6) to provide a circuit capable of performing a voice multiple signal and a matrix control by outputting two outputs by inputting two PLL outputs, An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a circuit diagram of the present invention, and transistors Q ₇ to Q ₉ and Q ₁₄ comparing outputs from the PLL 2 for detecting a stereo ID signal and the PLL 3 for detecting a dual voice ID signal in FIG. ) And a transistor (Q ₃ ~ ~) which is switched according to the output of the comparator (11) and resistor (R ₁₂ ) and outputs for controlling the voice multiple signal control unit and the matrix unit (7). Q ₆ ), an output control unit 12 composed of a resistor Rs (R ₄ ) and a transistor Q operating when a high level is output from the output control unit 12 to allow the first and second currents to operate in advance. ₁₀ ) (Q ₁₁ ), the first current source 13 of the resistor (R ₈ ) and the transistor (Q ₁₂ ) (Q ₁₃ ), the second current source 14 of the resistor (R ₁₁ ), and the When the 1 and 2 current sources 13 and 4 operate, transistors Q ₁ (Q ₂ ) and resistors R ₁ (R ₂ ) which continuously output currents of the same magnitude using the transistor as a current source. First Current Mirror 15 and Trans The second current mirror _{16 is} formed of the resistors Q ₁₅ and Q ₁₆ and the resistors R ₅ and R ₆ .

In the figure, reference numeral V _{REF, which} is not described, is a reference voltage, and V ₁₃ is a bias voltage R ₉ , R ₁₀ , R ₁₄ , and R ₁₅ is a resistor.

According to the present invention configured as described above, when the input voltage through the input signal terminal B ₁ becomes higher than the reference voltage V _REF , the transistor Q ₇ of the comparator 11 is turned on and at the same time, the transistor Q ₈ (Q ₉ ). Since the emitter voltage of the transistor is increased, the transistor Q ₈ (Q ₉ ) is turned off, so that the voltage drop across the resistor Rs of the output control unit 12 increases, so that the transistor Q ₅ (Q ₆ ) is turned off and the transistor Q ₃ ) (Q ₄ ) is on.

Therefore, a high level voltage is output to the output signal terminal D ₁ through the collector of the transistor Q ₄ , and no current flows through the collector of the transistor Q ₅ , so the output voltage of the output signal terminal D ₂ is low. It becomes a level.

In addition, since the collector current of the transistor Qs is applied to the base of the transistor Q ₁₁ of the first current source 13 and the transistor Q ₁₁ is turned on, the transistor Q ₁₀ is turned on. Is operated so that the current in the collector of transistor Q ₁ I) flows and the current flowing through the low pass filter 1 of the station is the collector current of the transistor Q ₁ ( The input voltage is increased by I) and the resistance (R ₇ ) x collector current ( Increase by I).

Here, in the case where the level of the modulated ID input signal S in FIG. 1 increases, the output current of the ID signal detection PLL circuits 4 and 5 increases, and the input voltage is reduced to the above operation. This increases as shown by the rising arrow direction Viu of a in FIG.

In addition, when the output of the ID signal detection PLL circuits 4 and 5, i.e., the input voltage of the ID signal detection and control circuit 6 falls, the direction of the downward arrow (Viu) in FIG. As shown in the figure, the hysteresis characteristics are shown in the figure.

In addition, the ID signal detection and output signal terminals D ₁ and D ₂ of the control circuit 6 have hysteresis characteristics as shown in FIG. 3B, and the voltage of the output signal terminals D ₁ and D ₂ is negative. The control of the matrix and the other parts of the multiple system is controlled, even if the input voltage is applied through the input signal terminal (B ₂ ) is controlled according to the above operating principle.

The present invention as described above can obtain the hysteresis characteristics of the input sensitivity in the voice multiple ID signal detection system, and once the ID signal is detected at a certain level, the ID signal detection and control circuit 6 Since the input voltage is increased, gain is generated in the ID signal detection and the input voltage of the control circuit 6, which can be changed by external noise, etc., which has the effect of having a more stable operation characteristic, that is, a strong characteristic against noise.

Claims (1)

A comparator 11 for comparing the outputs of the stereo ID signal detection PLL circuit and the dual voice ID signal detection PLL circuit, and is connected between the current mirrors and switched in accordance with the output of the comparator, and the voice multiple signal control unit and matrix unit An output control unit 12 for outputting an output to control, first and second current sources 13 and 14 for operating the first and second current mirrors by operating when a predetermined level is output from the output control unit, and the first and second current mirrors. And a first and second current mirrors (15) and (16) for continuously outputting a constant amount of current increased according to the operation of the first and second current sources.