Distance-adaptive microphone for video camera

• US 5,477,270 A
• Filed: 02/08/1994
• Issued: 12/19/1995
• Est. Priority Date: 02/08/1993
• Status: Expired due to Term

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Park, Won-bok
• Primary Examiner(s): Groody, James J.
• Assistant Examiner(s): Murrell, Jeffrey S.
• Application Number:
  US08/194,372
• Time in Patent Office: 679 Days
• Field of Search: 348/222, 348/20, 348/240, 381/26, 381/92, 381/120, 381/122
• US Class Current: 348/222.1
• CPC Class Codes: H04N 23/661 Transmitting camera control signals through networks, e.g. control via the Internet
• CPC Class Codes: H04R 5/027 Spatial or constructional arrangements of microphones, e.g. in dummy heads
• CPC Class Codes: H04S 1/007 in which the audio signals are in digital form data reduction aspects thereof based on psychoacoustics G10L19/02
• CPC Class Codes: Y10S 358/906 Hand-held camera with recorder in a single unit

Abstract

A camcorder includes a camera section receiving a subject image subject through a zoom lens, converting the subject image to a video signal and generating a corresponding wide/tele signal representing position of the zoom lens, an audio processing part including a plurality of microphones receiving input sounds from the subject and converting the input sounds into a recordable audio signal, and a recorder/reproducer which records and reproduces the video signal and the recordable audio signal onto video tape. The audio processing part includes a plurality of analog elements. The audio processing part continuously amplifies the input audio signal using the analog elements in response to the wide/tele signal and outputs the recordable audio signal which corresponds to perceived distance from the camcorder to the subject. The analog elements may be transistors, wherein the dynamic resistance of each transistor is continuously varied responsive to the wide/tele signal.

Claims

1. A sound receiving microphone for a video camera generating a wide/tele signal which changes according to a zoom lens position which provides a life-like sound in response to the wide/tele signal, said sound receiving microphone comprising:

a plurality of microphones converting sounds from a subject into a respective electric signals and amplifying said electrical signals to thereby produce respective amplified signals;

a plurality of analog sound receiving circuits, each of said circuits receiving one of said respective amplified signals and generating a respective attenuated signal based on dynamic resistance of a respective transistor and said wide/tele signal; and

a plurality of sound mixers, each of said mixers receiving, summing and amplifying selected ones of said attenuated signals.

2. The sound receiving microphone of video camera according to claim 1, wherein said microphones comprise:

a left microphone receiving a left sound;

a right microphone receiving a right sound;

a central microphone receiving a central sound; and

a microphone processor which generates said respective amplified signals.

3. The sound receiving microphone of video camera according to claim 1, wherein said analog sound receiving circuits comprise:

a central sound receiving circuit which continuously changes a selected center amplified signal corresponding to a central audio signal received by said microphones in proportion to change of said wide/tele signal;

a left sound receiving circuit which continuously changes a selected left amplified signal corresponding to a left audio signal received by said microphones inversely proportional to the change of said wide/tele signal; and

a right sound receiving circuit which continuously changes a selected right amplified signal corresponding to a right audio signal received by said microphones inversely proportional to the change of said wide/tele signal.

4. The sound receiving microphone according to claim 1, wherein said sound mixers comprise a left sound mixer and a right sound mixer, where each of said left and right sound mixers commonly receives one of said respective attenuated signals corresponding to a central sound received by said microphones.

5. A sound receiving microphone for a video camera generating a wide/tele signal which changes according to a zoom lens position which provides a life-like sound in response to the wide/tele signal, said sound receiving microphone comprising:

a plurality of microphones converting sounds from a subject into an respective electric signals and amplifying said electrical signals to thereby produce respective amplified signals, said microphones comprising;

a left microphone receiving a left sound;

a right microphone receiving a right sound;

a central microphone receiving a central sound; and

a microphone processor which generates said respective amplified signals;

a plurality of analog sound receiving circuits, each of said circuits receiving one of said respective amplified signals and generating a respective attenuated signal based on dynamic resistance of a respective transistor and said wide/tele signal, said analog sound receiving circuits comprising;

a central sound receiving circuit which continuously changes a selected center amplified signal corresponding to a central audio signal received by said microphones in proportion to change of said wide/tele signal to produce a central attenuated signal;

a left sound receiving circuit which continuously changes a selected left amplified signal corresponding to a left audio signal received by said microphones inversely proportional to the change of said wide/tele signal to produce a left attenuated signal; and

a right sound receiving circuit which continuously changes a selected right amplified signal corresponding to a right audio signal received by said microphones inversely proportional to the change of said wide/tele signal to produce a right attenuated signal; and

a plurality of sound mixers, each of said mixers receiving, summing and amplifying selected ones of said attenuated signals, each of said mixers receiving said central attenuated signal.

6. A camcorder comprising:

a camera section receiving an image of a subject through an optical system including a zoom lens, converting the subject image into a video signal and generating a wide/tele signal in accordance with position of said zoom lens;

an audio processing part receiving input sounds from said subject at a plurality of microphones and converting the input sounds into respective audio signals, continuously amplifying said audio signals according to both said wide/tele signal and dynamic resistance of respective transistors and generating a final audio signal which corresponds to the perceived distance between said subject and said optical system; and

a recorder/reproducer which records and reproduces said video signal and said final audio signal on video tape.

7. A sound receiving microphone for a video camera generating a wide/tele signal which changes according to a zoom lens position which provides a life-like sound in response to the wide/tele signal, said sound receiving microphone comprising:

microphone means for converting sounds from a subject into a plurality of electric signals and for amplifying said electrical signals to thereby produce respective amplified signals;

analog sound receiving means for receiving a respective one of said amplified signals and for generating a corresponding attenuated signal based on dynamic resistance of a respective included transistor and said wide/tele signal; and

mixing means for receiving, for summing and for amplifying selected ones of said attenuated signals.

8. The sound receiving microphone of video camera according to claim 7, wherein said microphone means comprises:

a left microphone receiving a left sound;

a right microphone receiving a right sound;

a central microphone receiving a central sound; and

a microphone processor which generates said respective amplified signals.

9. The sound receiving microphone of video camera according to claim 7, wherein said receiving means comprises:

a central sound receiving circuit which continuously changes a selected center amplified signal corresponding to a central audio signal received by said microphone means in proportion to change of said wide/tele signal;

a left sound receiving circuit which continuously changes a selected left amplified signal corresponding to a left audio signal received by said microphone means inversely proportional to the change of said wide/tele signal; and

a right sound receiving circuit which continuously changes a selected right amplified signal corresponding to a right audio signal received by said microphone means inversely proportional to the change of said wide/tele signal.

10. The sound receiving microphone according to claim 7, wherein said mixing means comprises:

a left sound mixer; and

a right sound mixer,

wherein each of said left and right sound mixers commonly receives one of said respective attenuated signals corresponding to a central sound received by said microphone means.