JPS60134530A - Fm receiver - Google Patents

Abstract

PURPOSE:To attain recording with high fidelity by providing an external terminal outputting an intermediate frequency of a receiver and superimposing a vertical synchronizing signal on the intermediate frequency signal so as to record the signal in a VTR in the form of the intermediate frequency. CONSTITUTION:A high frequency signal received by an antenna 1 is subject to high frequency amplification 3 and the signal is converted into an intermediate frequency signal at a frequency converting section 4. The intermediate frequency signal is fed to an FM detector 5 and also to the 2nd frequency converting section 8. The signal is converted into the 2nd intermediate frequency within a video image frequency of a video tape recorder VTR by the converting section 8, amplified by the 2nd intermediate frequency amplifier section 9 and fed to a synthesis circuit 10. The circuit 10 synthesizes the synchronizing signal from a synchronizing signal generator 11 with the 2nd intermediate frequency and outputs the result to the 2nd intermediate frequency output terminal 12. Then the vertical synchronizing signal is superimposed on the intermediate frequency signal, the result is recorded in the VTR in the form of the intermediate frequency not through the detection section 5 of the receiver, stored with high fidelity and multiplex recording of several stations is attained.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an FM receiver.

(Constitution of Conventional Example and Its Problems) Conventionally, this type of receiver is constructed as shown in FIG. That is, the high frequency signal input from the antenna l is amplified by the high frequency amplification section 2, converted to an intermediate frequency signal via the frequency conversion section 3, and amplified by the intermediate frequency amplification section.
The signal is detected by the detection section 5, amplified as a low frequency signal by the low frequency amplification section 6, and outputted to the output terminal 7.

That is, by attaching a receiver to the output terminal 7, the voice can be heard.

In these configurations, when attempting to record audio, the signal from the output terminal 7 is generally recorded using an audio recorder.

However, in these methods, since the light passes through a non-linear section called the detection circuit, it cannot be said that high-fidelity recording can be achieved.

(Objective of the Invention) The present invention eliminates these conventional drawbacks, and allows extremely high-fidelity recording by recording in the form of an intermediate frequency without passing through the detection section of the receiver. The purpose is to also enable multiple recording.

(Structure of the Invention) In order to achieve this object, the present invention amplifies the FM radio waves received by a receiver into high frequencies, obtains an intermediate frequency using a frequency conversion circuit, amplifies this intermediate frequency, and amplifies the vertical synchronizing signal (video (vertical synchronization signal handled by a tape recorder) is superimposed and output as an external output of the receiver.

Note that this intermediate frequency is set to a frequency that can be recorded on a video tape recorder (for example, 3 MHz or less).

With this configuration, the contents of the FM broadcast can be recorded without going through the detection section of the receiver, making it possible to record with high fidelity.

By making the intermediate frequency amplification section broadband,
Simultaneously record several stations in close proximity using information communication (multiple recording)
can do.

(Description of Embodiment) Hereinafter, one embodiment of the present invention will be described using FIG. 2. Note that in FIG. 2, the same parts as in FIG. 1 are given the same numbers.

1 is an antenna, 2 is a high frequency amplification section, 3 is a frequency conversion section,
4 is an intermediate frequency amplification section (generally 10.7 MHz is used), 5 is an FM detection section, 6 is a low frequency amplification section, 7
This is an output terminal for low frequency signals, and its function is completely unchanged from the conventional one.

Next, the main part of the present invention is a second frequency conversion section 8, which converts the intermediate frequency (10.7 MHz) into a frequency (10.7 MHz) that falls within the video frequency characteristics of the video tape recorder.
(second intermediate frequency). 9 is a second intermediate frequency amplification section, which amplifies the second intermediate frequency.

10 is a synthesis circuit for synthesizing the second intermediate frequency and the synchronization signal obtained by the synchronization signal generator 11 of 11, and operates as an adder circuit, ) is sent to output terminal 12.

Next, the operation of the above configuration will be described. First, steps 1 to 4 are completely the same as those of the conventional system, so the explanation will be omitted. Here, the intermediate frequency output (1o, 7 MHz) of No. 4 is converted to a second intermediate frequency (for example, 1 MHz) in the frequency converter 8.
z), amplification is performed in the intermediate frequency amplification section.

Next, in the synthesis circuit 10, the second intermediate frequency is converted to the vertical synchronization signal (!r
V, a vertical synchronizing signal used in a VTR), and is synthesized with the signal in the form required when recording on a video tape recorder. It will be done.

When this signal is directly input to the video terminal of a video tape recorder (VTR), it is recorded in the video recording section of the video tape.

In addition, when this FM radio wave is stereo multiplexed,
Since the second intermediate frequency is also multiplex modulated, the content recorded on the videotape also becomes a multiplexed stereo signal.

Regarding playback, since the same frequency as the second intermediate frequency is output from the video playback terminal of the video tape recorder, by tuning to this and detecting it, it can be heard as a low frequency signal.

“Sat/Here, we will take a wide 1JJ frequency band (for example,
(1~3 MF-1z, etc.) Sometimes, if there are several stations whose frequencies of the input radio waves are close to each other (particularly in information and communications, etc., there are 20 to 40 kHz intervals), those few stations is converted to an intermediate frequency at once, and the frequency of each station can be recorded for each converted intermediate frequency, and when playing back, it is possible to tune to the required intermediate station and wave number and select and play it arbitrarily. .

(Effects of the Invention) As described above, according to the method of the present invention, audio signals can be recorded in the form of directly received radio waves, which reduces deterioration of the signal (audio signal) and widens the intermediate frequency band. By doing so, effects such as direct multiplex recording (simultaneous recording of frequencies of several stations) can be obtained.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a conventional receiver, and FIG. 2 is a diagram showing an embodiment of the present invention. 1. Antenna, 2. High frequency amplification section, 3. Frequency conversion section, 4. Intermediate frequency amplification section, 5. FM detection section.
6...Low frequency amplification section, 7...Low frequency signal output terminal, 8
... second frequency conversion section, 9 ... second intermediate frequency amplification section, 10 ... synthesis circuit, 11 ... synchronization signal generator, 1
2...Second intermediate frequency output terminal.

Claims (2)

[Claims] (1) An FM receiver comprising an external terminal for outputting an intermediate frequency signal of the receiver, and having a vertical synchronization signal superimposed on the intermediate frequency signal. (2) The frequency of the intermediate frequency signal is set within the video frequency characteristics of a VTR.
FM receiver described in section 1).