JPH02179198A - Camera incorporated type video tape recorder - Google Patents

Abstract

PURPOSE:To automatically switch an output signal so that a sound signal can be enjoyed in an optimum state by providing a discriminating circuit for discriminating automatically a fact that a terminal is inserted into one of sound signal output terminals, and controlling a signal output to the sound signal output terminal by a discriminating signal from its discriminating circuit. CONSTITUTION:The tape recorder is provided with a signal output processing circuit 4 which contains a first circuit for outputting two or more sound signals and a second circuit for mixing two or more sound signals, and switches and outputs signals from a first and a second circuits, respectively, and a discriminating circuit 10 for deciding automatically a connected state of a load to a voice output terminal to which an output signal from this signal output processing circuit 4 is supplied, and in accordance with a signal from this discriminating circuit 10, a state of a sound signal output from the signal output processing circuit 4 is controlled optimumly. In such a way, by outputting a mixed signal by a discriminating signal from the discriminating circuit for discriminating automatically a state of a terminal inserted into an output terminal, a high tone quality can be enjoyed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a camera-integrated video tape recorder that has an output circuit that outputs two or more audio signals and is capable of selecting the output signal. .

Conventional technology In recent years, camera-integrated video tape recorders have also been
FM audio signal processing circuits have been introduced, and the high sound quality of FM audio has become a hot topic. In the conventional system, two different systems of audio signals (hereinafter referred to as Lch) are used.

The output section of the Rch (referred to as "Rch") is switched by a switch operation by the user, and the selection by switching this switch is when using a conventional RF converter or audio device that has only one audio input system. Depending on the switch status, only Lch audio or Rc
A disadvantage arises in that only the audio of h is output.

An example of an audio signal output section of a conventional camera-integrated video recorder will be described below with reference to the drawings. FIG. 3 shows an output section for audio signals recorded and reproduced using the conventional FM system.

In FIG. 3, 1 is an FM audio signal processing circuit, 2 is an Lch side audio output signal from the audio signal processing circuit 1, and 3
is the Rch side audio output signal from the audio signal processing circuit 1,
4 is an audio signal output processing circuit that can mix or switch the audio output signals 2 and 3; 6 is a control signal to the audio signal output processing circuit 4; 6 is a switch circuit that sets the output of the audio signal; 7.8 is an audio output terminal from the device to the outside.

The operation of the conventional audio signal output means configured as described above will be explained below.

The two H audio output signals 2 and 3 are recorded and reproduced by the FM audio signal processing circuit 1 without being switched, and are supplied to the audio signal output processing circuit 4. Here, depending on the state of the control signal 6 from the audio signal output selection switch circuit 6, the audio signal from the audio signal output processing circuit 4 is output to the audio output terminal 7.8. For example, when the control signal 5 is at Hi level, the audio signal output processing circuit 4 outputs the Lch signal to the output terminal 7. Rc
The signal h is supplied to the output terminal 8, and the control signal 5 is also supplied.

In the case of Lch and Rc level, the audio signal output processing circuit 4
It is configured to supply a mixed signal of h to output terminals 7 and 8.

Problems to be Solved by the Invention However, in the above configuration, the audio output terminal 7
．． When connecting an audio device or an RF converter having only one system of audio input terminals to the audio output terminals 7 and 8, connect it to either one of the audio output terminals 7 and 8.

Therefore, when the control signal 6 is at the LO level, a mixed Lch and Rch audio signal is output and it is possible to enjoy high quality sound, but when the control signal 5 is at the Hi level, the Lch or Rch audio signal is output. Since only a few audio signals are output, the user has to change the state of the audio signal output selection switch circuit 6, which is an inconvenience.

Means for Solving the Problems In view of the above-mentioned problems, the present invention provides a discrimination circuit that automatically discriminates whether a terminal is inserted into either one of the audio signal output terminals. The signal output to the audio signal output terminal is optimally controlled based on the determination signal.

Function: With the above-described configuration, the present invention detects whether a terminal is inserted into either one of the output terminals by a discrimination signal from a discrimination circuit that automatically discriminates the state of the terminal inserted into the output terminal. In this case, you can enjoy high sound quality by outputting a mixed signal of Lch and Rch.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the present invention.

This embodiment differs from the conventional one in that it includes a discrimination circuit 1o that determines the presence or absence of a tidal power terminal based on a signal 9 indicating the state of the output terminal, and a detection circuit 12 that detects the state of the audio output terminal. It is in.

As shown in FIG. 2, the detection circuit 12 has the output terminal of the audio signal output processing circuit 4 connected to the contact piece & of the output terminal 7 or 8 via a circuit consisting of a capacitor C1 and a resistor R1. The output end 9A of the control signal is connected, and the power supply vCc is also connected via the resistor R2.

In this embodiment, a pin jack type is used as the output terminal 7 or 8, and when no terminal is inserted into the pin jack serving as the output terminal, the signal 9 indicating the state of the output terminal is V. The voltage becomes cXR1/(R, +R2), and when the terminal is inserted into the pin jack, contact pieces a and b are in an open state, and signal 9 is V. The voltage becomes C. This makes it possible to detect the presence or absence of an audio output terminal.

As described above, according to this embodiment, the state of the output terminal can be determined based on the signal 9 indicating the state of the audio output terminal, and the output state of the audio signal can be optimized. That is, when a terminal is inserted into either one of the output terminals, the signal 5 from the audio signal output selection circuit 6 becomes Lo level due to the output signal 11 of the discrimination circuit 1o, and the signal 5 from the audio output terminals 7 and 8 becomes Lo level. A mixed signal of Lch and Rch will be output. In this case, output is possible regardless of the state of the selection switch set by the user.

In addition, in the camera-integrated video recorder, R
It is often the case that an RF converter is used to enjoy playback audio on a TV, but in that case, power is supplied from the main body of the camera-integrated video tape recorder to the RF converter as a means of determining the status of the audio output terminal. This is also possible by detecting the state of the power supply terminal.

Effects of the Invention As described above, according to the present invention, it is possible to automatically switch the audio output signal, which was conventionally selected by the user, by detecting the state of the output terminal, and to select the optimum audio output signal. It is possible to obtain excellent effects such as being able to enjoy audio signals while in the same state.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the camera-integrated video tape recorder of the present invention, Fig. 2 is a circuit diagram showing the main parts of Fig. 1, and Fig. 3 is a block diagram of a conventional audio signal output circuit. It is. 1...FM audio signal processing circuit, 4...
...Audio signal output processing circuit, 6...Audio signal output selection circuit, 1o...Output terminal discrimination circuit.

Claims (1)

[Claims] The first circuit includes a first circuit that outputs two or more audio signals, and a second circuit that mixes two or more audio signals.
It includes a signal output processing circuit that switches and outputs the signal from the second circuit, and a determination circuit that automatically determines the connection state of the load to the audio output terminal to which the output signal from the signal output processing circuit is supplied. . A camera-integrated video tape recorder, characterized in that the situation of audio signal output from the signal output processing circuit is optimally controlled in accordance with the signal from the discrimination circuit.